# NBIA Summer School on Neutrinos: Here, There & Everywhere

Europe/Copenhagen
Auditorium A (Niels Bohr Institute)

### Auditorium A

#### Niels Bohr Institute

Blegdamsvej 17 DK-2100 Copenhagen
,
Description

The Niels Bohr International Academy (NBIA) invites PhD students and advanced Master students to the International PhD Summer School on Neutrinos: Here, There & Everywhere. This one-week school aims to bring the participants up to date with the latest developments in neutrino physics, from theoretical issues to experimental results, including astrophysical and cosmological aspects.

The deadline for registration is March 31, 2021.  There is no participation fee.

Students will be given topical introductions, along with an overview of the current state of the field and the open questions that confront it. The invited lecturers are internationally renowned experts in their fields. The school participants will gain a broad understanding of current theoretical problems in neutrino physics, state-of-the-art neutrino experiments, and applications of neutrinos in cosmology and astrophysics.

Update (July 09): The videos of all lectures and topical seminars of the school are in our YouTube channel

• Zoom [join room]: For all lectures, topical seminars, and student talks (password: check your e-mail)

• Slack [join workspace]: For sending written questions during presentations, and for longer discussions

• Gather.town [link to space]: For self-study & group work, coffee, lunch, and live social interaction (password: check your e-mail)

• YouTube [link to channel]: For recordings of the lectures and seminars

Update (April 12): Due to the slow roll-out of the COVID vaccine internationally, we have now decided to offer this year's summer school entirely online. We are truly sorry that we will not be able to host you in Copenhagen this summer!

### Guest Lectures & Lecturers

Neutrino Cosmology
Olga Mena
Instituto de Física Corpuscular (IFIC), Universidad de Valencia

Neutrino Theory & Phenomenology
Joachim Kopp
Institut für Physik, Johannes Gutenberg-Universität, Mainz

Neutrino Astrophysics & Astronomy
Foteini Oikonomou
Norwegian University of Science and Technology

### Topical Seminar Speakers (NBI)

Tyler Corbett
Rasmus S. L. Hansen
D. Jason Koskinen
Oleg Ruchayskiy
Shashank Shalgar
Thomas Stuttard

Tetiana Kozynets
Enrico Peretti
Yoann Genolini

### Local Organizers

Participants
• Abinash Medhi
• Aleesha KT
• Alessandro Santoni
• ALKA KUMARI
• AMAN Gupta
• América Noemí Morales Anda
• Andrea Alejandra Aguilar Mayorga
• Andreas Bally
• Andreas Nygaard
• Ankur Nath
• Ariel Zuñiga Reyes
• Arnab Chaudhuri
• Arvind Kumar Mishra
• Asli Abdullahi
• Audrey Fung
• Bernardo Gonçalves
• Bichitra bijay Boruah
• Caterina Boscolo Meneguolo
• Cristhian Calderon
• Damiano F. G. Fiorillo
• Dana Abdallah
• Daniele Massaro
• Dario Lorenzoni
• Devidutta Gahan
• Dhruvi Saraniya
• Diego Cardona
• Diego Venegas Vargas
• Domenik Ehlert
• Débora Barreiros
• Eleonora Loffredo
• Emil Brinch Holm
• Enrico Peretti
• Federica Pompa
• felipe Villazon
• Fernando Millan
• Foteini Oikonomou
• Gabriela Rodrigues Araujo
• George Marshall
• George Parker
• Giovani Dalla Valle Garcia
• GONZALO SANCHEZ GARCIA
• Gustavo Silva Alves
• Haroon Akhtar Qureshi
• Harshal Kulkarni
• Hasan SANSAR
• Hilberto Silva
• Ilaria Viale
• Jaime Hoefken Zink
• Jason Koskinen
• Jeffrey Lazar
• Jessica Lastow
• Joachim Kopp
• Jose Agustín Lozano Torres
• Jotin Gogoi
• Joy Ganguly
• Karen Macías Cárdenas
• Kathrine Groth
• Keerthana Rajan L
• Kjartan Másson
• Lavina Sarma
• Lucile Mellet
• Maitrayee Mandal
• Mar Ciscar
• Marco A. Ayala-Torres
• Marie Cornelius Hansen
• Markus Ahlers
• Mauricio Bustamante
• Mehran Dehpour
• MERLIN VARGHESE
• Michael Campana
• Michael Gjertsen
• MIHIR PATEL
• Moritz Neuberger
• Munera Alrashed
• NAYANA GAUTAM
• Nele Volmer
• Nikhil Mohan
• Nimmy Sarah Alex
• Noel Alberto Cruz Venegas
• Nora Valtonen-Mattila
• Oleg Ruchayskiy
• Olga Mena
• Pablo Reyes
• Pavlo Plotko
• Prithivraj G
• Quoc Viet NGUYEN
• Rajeev Singh
• Ralph Torres
• Rasmi Enrique Hajjar Muñoz
• Rasmus S. L. Hansen
• Ricardo Andrés Martínez von Dossow
• Sabila Parveen
• Saeid Foroughi-Abari
• Sahar Safari
• Santiago Pena Martinez
• Shabeeb Alalawi
• Shailaja Mohanty
• Shashank Shalgar
• Shekhar Banerjee
• Shivanshi Tiwari
• ShivaSankar K.A
• Simon Chiche
• Simone Rossoni
• Souvik Mondal
• Sreerupa Chongdar
• Tetiana Kozynets
• Thanh Nguyen
• Therese Paulsen
• Tianai Ye
• Tianyi Zhou
• Timo Stürwald
• Ting Cheng
• Tom Stuttard
• Trisha Sarkar
• Tyler Corbett
• Victor Valera
• Vignesh Raj Selvam
• Vijayatha V
• Vishnu T
• Xiaobin Lu
• Xurun Huang
• Yanina Biondi
• Yashwanth S Prabhu
• Yoann Genolini
• zainab sedaghatmanesh
Contact
• Monday, July 5
• 9:45 AM 10:00 AM
Welcome 15m https://ucph-ku.zoom.us/j/65131069481?pwd=Sk1ZMUlLU3F0NmNlQlFVNkJiNmlUQT09 (Zoom)

### https://ucph-ku.zoom.us/j/65131069481?pwd=Sk1ZMUlLU3F0NmNlQlFVNkJiNmlUQT09

#### Zoom

• 10:00 AM 11:00 AM
Neutrino Theory & Phenomenology https://ucph-ku.zoom.us/j/65131069481?pwd=Sk1ZMUlLU3F0NmNlQlFVNkJiNmlUQT09 (Zoom)

### https://ucph-ku.zoom.us/j/65131069481?pwd=Sk1ZMUlLU3F0NmNlQlFVNkJiNmlUQT09

#### Zoom

• 10:00 AM
Neutrino Theory & Phenomenology: Lecture I 1h
Speaker: Joachim Kopp (CERN and JGU Mainz)
• 11:00 AM 11:15 AM
Coffee 15m https://gather.town/i/1ezHGAq6 (Gather.town)

### https://gather.town/i/1ezHGAq6

#### Gather.town

• 11:15 AM 12:15 PM
Neutrino Astrophysics & Astronomy https://ucph-ku.zoom.us/j/65131069481?pwd=Sk1ZMUlLU3F0NmNlQlFVNkJiNmlUQT09 (Zoom)

### https://ucph-ku.zoom.us/j/65131069481?pwd=Sk1ZMUlLU3F0NmNlQlFVNkJiNmlUQT09

#### Zoom

• 11:15 AM
Neutrino Astrophysics & Astronomy: Lecture I 1h
Speaker: Foteini Oikonomou (Norwegian University of Science and Technology)
• 12:15 PM 1:30 PM
Lunch 1h 15m https://gather.town/i/1ezHGAq6 (Gather.town)

### https://gather.town/i/1ezHGAq6

#### Gather.town

• 1:30 PM 2:15 PM
Student Talks https://ucph-ku.zoom.us/j/65131069481?pwd=Sk1ZMUlLU3F0NmNlQlFVNkJiNmlUQT09 (Zoom)

### https://ucph-ku.zoom.us/j/65131069481?pwd=Sk1ZMUlLU3F0NmNlQlFVNkJiNmlUQT09

#### Zoom

• 1:30 PM
Chiral EFT Treatment of Neutrinoless Double Beta Decay with Majoron Emission 15m

Lepton number conservation is an accidental symmetry of the Standard Model. However, lepton flavour is violated by the prominent example of neutrino oscillations. Therefore it is reasonable to investigate whether lepton number is truly conserved in nature. A popular test for this is neutrinoless double beta decay ($0 \nu \beta \beta$) which physicists have been investigating for a long time already. A variation of this is $0 \nu \beta \beta$ with additional emission of a scalar, the so-called Majoron $\phi$. This is the case that will be presented in this talk. We are aiming to treat this case using chiral effective field theory (chiral EFT). I will give an introduction to work that has already been performed on this topic for both $0 \nu \beta \beta$ with Majoron emission ($0 \nu \beta \beta \phi$) and $0 \nu \beta \beta$ in chiral EFT. Then I will present the current state of our work of using chiral EFT methods to investigate $0 \nu \beta \beta \phi$.

Speaker: Nele Volmer (Max-Planck-Institut für Kernphysik)
• 1:45 PM
Neutrino masses from simple scoto-seesaw model with spontaneous CP violation 15m

I will discuss our recent work on a simple scoto-seesaw model that accounts for dark matter and neutrino masses with spontaneous CP violation. This is achieved with a single horizontal $\mathcal{Z}_8$ discrete symmetry, broken to a residual $\mathcal{Z}_2$ subgroup responsible for stabilizing dark matter. CP is broken spontaneously via the complex vacuum expectation value of a scalar singlet, inducing leptonic CP-violating effects. We find that the imposed $\mathcal{Z}_8$ symmetry pushes the values of the Dirac CP phase and the lightest neutrino mass to ranges already probed by ongoing experiments.

Speaker: D. Barreiros (CFTP/IST, U. Lisboa)
• 2:00 PM
Flavoured leptogenesis and type-II seesaw mechanism with two Higgs triplet scalars 15m

Type-II seesaw mechanism has been widely studied already as the link between neutrino mass generation beyond Standard Model (SM) and leptogenesis. In this study, the SM is minimally extended by two triplet Higgs scalars (with hypercharge $Y=2$), with one triplet having complex vacuum expectation value (vev). The triplet vevs are bounded by the $\rho$-parameter constraint as, $\omega_{1}$, $\omega_{2}\ll v$, where $v$ is the vev of the SM Higgs doublet. The neutrino mass gets generated by two massive triplet Higgs in this model. On the other hand, purely flavoured leptogenesis is achieved when the triplet Higgs scalar of mass $M_{T}\sim10^{9}$ GeV, undergoes out-of-equilibrium bi-lepton decay, specially through lepton loop. The lepton asymmetries further get converted into baryon asymmetry via nonperturbative sphaleron process. This study shows the efficiency of type-II seesaw mechanism with two triplet scalars, to estimate the baryon asymmetry through fully flavoured leptogenesis. Here, baryon asymmetry of the order $\sim 10^{-10}$ is achieved, which falls within the observed range. The dependence of the baryon asymmetry on the branching ratios of triplet scalar is also studied here. To further increase the predictability of the mechanism, two-zero texture- $B_{2}$ is introduced in the neutrino mass matrix. The neutrino mass matrix elements are bounded by the latest neutrino oscillation parameter data and the sum of neutrino mass is taken to be $\Sigma_{i} m_{i}<0.16$ eV. The efficacy of two-zero texture $B_{2}$ in two Higgs triplet scenario is mentioned.

Speaker: Sreerupa Chongdar (National Institute of Technology, Rourkela)
• 2:15 PM 2:45 PM
Topical Seminar https://ucph-ku.zoom.us/j/65131069481?pwd=Sk1ZMUlLU3F0NmNlQlFVNkJiNmlUQT09 (Zoom)

### https://ucph-ku.zoom.us/j/65131069481?pwd=Sk1ZMUlLU3F0NmNlQlFVNkJiNmlUQT09

#### Zoom

• 2:15 PM
Neutrino oscillations in ice 30m
Speaker: D. Jason Koskinen (niels bohr institute)
• 2:45 PM 3:30 PM
Self Study and Group Work https://gather.town/i/1ezHGAq6 (Gather.town)

### https://gather.town/i/1ezHGAq6

#### Gather.town

• 3:30 PM 4:00 PM
Coffee 30m https://gather.town/i/1ezHGAq6 (Gather.town)

### https://gather.town/i/1ezHGAq6

#### Gather.town

• 4:00 PM 4:30 PM
Student Talks https://ucph-ku.zoom.us/j/65131069481?pwd=Sk1ZMUlLU3F0NmNlQlFVNkJiNmlUQT09 (Zoom)

### https://ucph-ku.zoom.us/j/65131069481?pwd=Sk1ZMUlLU3F0NmNlQlFVNkJiNmlUQT09

#### Zoom

• 4:00 PM
The effect of muons production and neutrino trapping on Binary Neutron Star merger remnants 15m

A deep understanding of the dynamics of Binary Neutron Star (BNS) mergers requires a detailed treatment of the relativistic hydrodynamics of the merger, as well as of the microphysics governing the underlying electromagnetic, strong, and weak interactions. Accurate numerical simulations are pivotal to correctly interpret the data collected through the detection of gravitational waves and electromagnetic counterparts.
State-of-the-art simulations do not include muons in the microphysics of the system, even though physical muon creation is possible in such conditions. As a consequence, muonic neutrinos are not distinguished by tauonic ones. Moreover, the contribution of trapped neutrinos to the thermodynamic quantities characterizing the remnant is usually neglected. During my talk, I will discuss the consequences of muons creation and neutrino trapping on the properties of BNS merger remnants.

Speaker: Eleonora Loffredo (Gran Sasso Science Institute and INFN)
• 4:15 PM
Exploring the extension of IceCube’s supernova observational reach using HE neutrinos from CCSNe ejecta-CSM interaction 15m

IceCube monitors for supernovae using low energy neutrinos (tens of MeV), observing our galaxy up to the large Magellanic cloud. Using the shock between the ejecta and the circumstellar material from the progenitor star, a high flux of high-energy neutrinos in the order of TeV and above can be created. These neutrinos would reach Earth 0.1 day – 1 year after the low-energy neutrinos. I will explore how IceCube’s observation reach can be extended using these high-energy neutrinos.

Speaker: Nora Valtonen-Mattila
• 4:30 PM 5:00 PM
Discussion https://ucph-ku.zoom.us/j/65131069481?pwd=Sk1ZMUlLU3F0NmNlQlFVNkJiNmlUQT09 (Zoom)

### https://ucph-ku.zoom.us/j/65131069481?pwd=Sk1ZMUlLU3F0NmNlQlFVNkJiNmlUQT09

#### Zoom

• Tuesday, July 6
• 10:00 AM 11:00 AM
Neutrino Astrophysics & Astronomy https://ucph-ku.zoom.us/j/65131069481?pwd=Sk1ZMUlLU3F0NmNlQlFVNkJiNmlUQT09 (Zoom)

### https://ucph-ku.zoom.us/j/65131069481?pwd=Sk1ZMUlLU3F0NmNlQlFVNkJiNmlUQT09

#### Zoom

• 10:00 AM
Neutrino Astrophysics & Astronomy: Lecture II 1h
Speaker: Foteini Oikonomou (Norwegian University of Science and Technology)
• 11:00 AM 11:15 AM
Coffee 15m https://gather.town/i/1ezHGAq6 (Gather.town)

### https://gather.town/i/1ezHGAq6

#### Gather.town

• 11:15 AM 12:15 PM
Neutrino Cosmology https://ucph-ku.zoom.us/j/65131069481?pwd=Sk1ZMUlLU3F0NmNlQlFVNkJiNmlUQT09 (Zoom)

### https://ucph-ku.zoom.us/j/65131069481?pwd=Sk1ZMUlLU3F0NmNlQlFVNkJiNmlUQT09

#### Zoom

• 11:15 AM
Neutrino Cosmology: Lecture I 1h
Speaker: Olga Mena (IFIC (CSIC-UV))
• 12:15 PM 1:45 PM
Lunch 1h 30m https://gather.town/i/1ezHGAq6 (Gather.town)

### https://gather.town/i/1ezHGAq6

#### Gather.town

• 1:45 PM 2:00 PM
Student Talks https://ucph-ku.zoom.us/j/65131069481?pwd=Sk1ZMUlLU3F0NmNlQlFVNkJiNmlUQT09 (Zoom)

### https://ucph-ku.zoom.us/j/65131069481?pwd=Sk1ZMUlLU3F0NmNlQlFVNkJiNmlUQT09

#### Zoom

• 1:45 PM
Decaying dark matter 15m

In this presentation I will go through the goals of my PhD project, what I am working on at the moment, and how this relates to neutrinos. I will present some analytical results (recently published) relating standard sterile neutrinos through $\Delta N_{\rm eff}$ to very short-lived decaying cold dark matter, and I will describe how the decay of massive dark neutrinos can help to relieve the Hubble tension along with the numerical aspect of this problem. During my PhD, I will investigate different cases of direct and two-body decays with increasing numerical difficulty. I will present the ideas and possible outcomes of these different cases.

Speaker: Andreas Nygaard (Aarhus University)
• 2:00 PM 2:30 PM
Topical Seminar https://ucph-ku.zoom.us/j/65131069481?pwd=Sk1ZMUlLU3F0NmNlQlFVNkJiNmlUQT09 (Zoom)

### https://ucph-ku.zoom.us/j/65131069481?pwd=Sk1ZMUlLU3F0NmNlQlFVNkJiNmlUQT09

#### Zoom

• 2:00 PM
Neutrino oscillations and new physics with IceCube 30m
Speaker: Tom Stuttard (Niels Bohr Institute, IceCube)
• 2:30 PM 3:30 PM
Neutrino Cosmology https://ucph-ku.zoom.us/j/65131069481?pwd=Sk1ZMUlLU3F0NmNlQlFVNkJiNmlUQT09 (Zoom)

### https://ucph-ku.zoom.us/j/65131069481?pwd=Sk1ZMUlLU3F0NmNlQlFVNkJiNmlUQT09

#### Zoom

• 2:30 PM
Neutrino Cosmology: Lecture II 1h
Speaker: Olga Mena (IFIC (CSIC-UV))
• 3:30 PM 4:00 PM
Coffee 30m https://gather.town/i/1ezHGAq6 (Gather.town)

### https://gather.town/i/1ezHGAq6

#### Gather.town

• 4:00 PM 4:30 PM
Student Talks https://ucph-ku.zoom.us/j/65131069481?pwd=Sk1ZMUlLU3F0NmNlQlFVNkJiNmlUQT09 (Zoom)

### https://ucph-ku.zoom.us/j/65131069481?pwd=Sk1ZMUlLU3F0NmNlQlFVNkJiNmlUQT09

#### Zoom

• 4:00 PM
Heavy decaying dark matter at future neutrino radio telescopes 15m

In the next decade, ultra-high-energy neutrinos in the EeV energy range will be potentially detected by next-generation neutrino telescopes. Although their primary goals are to observe cosmogenic neutrinos and to gain insight into extreme astrophysical environments, they have the great potential of indirectly probing the nature of dark matter. In this talk, we study the projected sensitivity of up-coming radio neutrino telescopes, such as RNO-G, GRAND and IceCube-gen2 radio array, to decaying dark matter scenarios. We investigate different dark matter decaying channels and masses, from $10^{7}$ to $10^{15}$ GeV. By assuming the observation of cosmogenic or newborn pulsar neutrinos, we forecast conservative constraints on the lifetime of heavy dark matter particles. We find that these limits are competitive with and highly complementary to previous multi-messenger analyses.

Speaker: Rasmi Enrique Hajjar Muñoz
• 4:15 PM
Neutrino Mixing by modifying the Yukawa coupling structure of constrained sequential dominance 15m

In the constrained sequential dominance (CSD), tri-bimaximal mixing (TBM)
pattern in the neutrino sector has been explained, by proposing a certain
Yukawa coupling structure for the right-handed neutrinos of the model.
However, from the current experimental data it is known that the values
of neutrino mixing angles are deviated from the TBM values. In order to
explain this neutrino mixing, we first propose a phenomenological model
where we consider Yukawa couplings which are modified from that of CSD.
Essentially, we add small complex parameters to
the Yukawa couplings of CSD. Using these modified Yukawa couplings, we
demonstrate that neutrino mixing angles can deviate from their TBM values.
We also construct a model, based on a flavor symmetry, in order to justify
the modified form of Yukawa couplings of our work.

Speaker: Joy Ganguly (Indian Institute of Technology Hyderabad)
• 4:30 PM 5:00 PM
Discussion https://ucph-ku.zoom.us/j/65131069481?pwd=Sk1ZMUlLU3F0NmNlQlFVNkJiNmlUQT09 (Zoom)

### https://ucph-ku.zoom.us/j/65131069481?pwd=Sk1ZMUlLU3F0NmNlQlFVNkJiNmlUQT09

#### Zoom

• Wednesday, July 7
• 10:00 AM 11:00 AM
Neutrino Theory & Phenomenology https://ucph-ku.zoom.us/j/65131069481?pwd=Sk1ZMUlLU3F0NmNlQlFVNkJiNmlUQT09 (Zoom)

### https://ucph-ku.zoom.us/j/65131069481?pwd=Sk1ZMUlLU3F0NmNlQlFVNkJiNmlUQT09

#### Zoom

• 10:00 AM
Neutrino Theory & Phenomenology: Lecture II 1h
Speaker: Joachim Kopp (CERN and JGU Mainz)
• 11:00 AM 11:15 AM
Coffee 15m https://gather.town/i/1ezHGAq6 (Gather.town)

### https://gather.town/i/1ezHGAq6

#### Gather.town

• 11:15 AM 12:15 PM
Neutrino Cosmology https://ucph-ku.zoom.us/j/65131069481?pwd=Sk1ZMUlLU3F0NmNlQlFVNkJiNmlUQT09 (Zoom)

### https://ucph-ku.zoom.us/j/65131069481?pwd=Sk1ZMUlLU3F0NmNlQlFVNkJiNmlUQT09

#### Zoom

• 11:15 AM
Neutrino Cosmology: Lecture III 1h
Speaker: Olga Mena (IFIC (CSIC-UV))
• 12:15 PM 1:30 PM
Lunch 1h 15m https://gather.town/i/1ezHGAq6 (Gather.town)

### https://gather.town/i/1ezHGAq6

#### Gather.town

• 1:30 PM 2:15 PM
Student Talks https://ucph-ku.zoom.us/j/65131069481?pwd=Sk1ZMUlLU3F0NmNlQlFVNkJiNmlUQT09 (Zoom)

### https://ucph-ku.zoom.us/j/65131069481?pwd=Sk1ZMUlLU3F0NmNlQlFVNkJiNmlUQT09

#### Zoom

• 1:30 PM
Physics studies for ND280 upgrade at T2K experiment 15m

Neutrino oscillation physics has now entered the precision era. In parallel with needing larger detectors to collect more data with, future experiments further require a significant reduction of systematic uncertainties with respect to what is currently available. In the neutrino oscillation measurements from the T2K experiment the systematic uncertainties related to neutrino interaction cross sections are currently the most dominant. To reduce this uncertainty a much improved understanding of neutrino-nucleus interactions is required. In particular, it is crucial to better understand the nuclear effects which can alter the final state topology and kinematics of neutrino interactions in such a way which can bias neutrino energy reconstruction and therefore bias measurements of neutrino oscillations. The upgraded ND280 near detector of T2K will directly confront our naivety of neutrino interactions using a new detector configuration with full polar angle acceptance and a much lower proton tracking threshold. Furthermore, neutron tagging capabilities in addition to precision timing information will allow the upgraded detector to estimate neutron kinematics from neutrino interactions. Such improvements permit access to a much larger kinematic phase space which correspondingly allows techniques such as the analysis of transverse kinematic imbalances (TKI) to offer remarkable constraints of the pertinent nuclear physics for T2K analyses. In this talk we quantitatively demonstrate ND280’s upgraded sensitivity to key nuclear effects such as removal energy and 2p2h. To this end, we present a fit of a parameterised interaction and flux model to simulated measurements of TKI and neutrino energy from the upgraded ND280.

Speaker: Quoc Viet NGUYEN (LPNHE, Paris)
• 1:45 PM
Exploring neutrino-nucleon cross sections at the EeV level in upcoming neutrino telescopes 15m

Measuring neutrino interactions with matter is arduous but rewarding. To date, experiments have measured the neutrino-nucleon cross section in the MeV-PeV range, using terrestrial and astrophysical neutrinos. We endeavor to push that measurement to the EeV scale, in order to test competing expectations of the deep structure of nucleons and possibly reveal new neutrino interactions. Cosmogenic neutrinos, long-sought but still undiscovered, provide the only feasible way forward. However, because their flux is low, they have evaded detection so far. Fortunately, upcoming in-ice radio-detection neutrino telescopes, like RNO-G and the radio component of IceCube-Gen2, have a real chance of discovering them in the next 10-20 years. In preparation, we perform the first detailed study of their sensitivity to the deep-inelastic-scattering neutrino-nucleon cross section at EeV energies, extracted from the attenuation of the cosmogenic neutrino flux as it traverses the Earth across different directions. We use up-to-date predictions and tools at every step: in the flux of cosmogenic neutrinos---predicted using recent ultra-high-energy cosmic-ray measurements---in their propagation inside the Earth---computed using leading and sub-leading neutrino interactions---and in their detection in radio-based neutrino telescopes---based on advanced simulated detector responses.

Speaker: Victor Valera Baca (Niels Bohr Institute)
• 2:00 PM
Mass hierarchy and CP violation in neutrino oscillation experiments 15m

Mass hierarchy and leptonic CP violation are the most sought questions in the ongoing and upcoming neutrino oscillation experiments. In this context, the latest results of T2K and NO$\nu$A is briefly discussed. The combined sensitivity of the extended run of T2K and NO$\nu$A, referred to as T2K-II and NO$\nu$A-II corresponding to the total exposures of $20\times10^{21}$ and $7.2\times10^{21}$ POT respectively, and with a reactor-based medium baseline experiment JUNO to the above problems have been explained. The results are based on our recent work (https://arxiv.org/abs/2009.08585).

Speaker: Ankur Nath (Tezpur University)
• 2:15 PM 3:00 PM
Self Study and Group Work https://gather.town/i/1ezHGAq6 (Gather.town)

### https://gather.town/i/1ezHGAq6

#### Gather.town

• 3:00 PM 3:30 PM
Coffee 30m https://gather.town/i/1ezHGAq6 (Gather.town)

### https://gather.town/i/1ezHGAq6

#### Gather.town

• 3:30 PM 4:00 PM
Topical Seminar https://ucph-ku.zoom.us/j/65131069481?pwd=Sk1ZMUlLU3F0NmNlQlFVNkJiNmlUQT09 (Zoom)

### https://ucph-ku.zoom.us/j/65131069481?pwd=Sk1ZMUlLU3F0NmNlQlFVNkJiNmlUQT09

#### Zoom

• 3:30 PM
Effective field theory 30m
Speaker: Tyler Corbett (NBI)
• 4:00 PM 4:30 PM
Student Talks https://ucph-ku.zoom.us/j/65131069481?pwd=Sk1ZMUlLU3F0NmNlQlFVNkJiNmlUQT09 (Zoom)

### https://ucph-ku.zoom.us/j/65131069481?pwd=Sk1ZMUlLU3F0NmNlQlFVNkJiNmlUQT09

#### Zoom

• 4:00 PM
Detection of Tau Neutrinos at the Super-Kamiokande Experiment 15m

The Super-Kamiokande experiment (SK) is the famed water Cherenkov detector which discovered the oscillation of atmospheric neutrinos. As a result of the oscillation of atmospheric muon neutrinos, tau neutrinos are expected to appear. Therefore, direct detection of tau neutrinos in the atmosphere provides unambiguous confirmation of the phenomenon of neutrino oscillation. Moreover, identifying and reducing tau neutrino background in the atmospheric oscillation analysis would increase the mass hierarchy sensitivity of SK.

In 2018, SK excluded the hypothesis of no tau appearance with a significance level of 4.6$\sigma$. SK used machine learning techniques of neural networks (NNs) to classify the tau charged-current interactions from the interactions of the atmospheric muon and electron neutrinos. The present NN of SK is a multilayer perceptron, with a single hidden layer. My research involves upgrading the NN for better classification, such as with the implementation of the more sophisticated algorithms of convoluted NNs.

In particular, the signatures to classify these interactions are expected to be seen in neutrons, which are copiously produced in the particle showers arising from the tau and atmospheric neutrino interactions. So far, information related to neutrons has never been used at SK for discerning tau neutrinos. The prospect of expanding the NN with new inputs about neutron captures is under consideration, owing to the enhanced detection of neutrons with the addition of gadolinium in SK. Preliminary results show that this additional information shall improve the NN classification, and hence, the detection of tau neutrinos.

Speaker: Maitrayee Mandal
• 4:15 PM
Two-Dimensional Air Shower Development with MCEq 15m

An accurate atmospheric neutrino flux is crucial for a multitude of physics studies with modern neutrino telescopes; as a signal for neutrino oscillation measurements, and as a background for searches of astrophysical neutrino sources. We seek to advance in the low-energy neutrino flux calculations (up to a few GeV) using the MCEq (Matrix Cascade Equations) code that numerically solves the one-dimensional cascade equations. For precision calculations at energies below a few GeV, which are well within reach of the IceCube Upgrade and KM3NeT-ORCA, the lateral component of hadronic cascades becomes important, requiring three-dimensional calculation schemes. We present a new study on the two-dimensional development of air showers within the MCEq framework as a necessary initial step towards a full 3D calculation, comparing our numerical solutions to those obtained with the Monte Carlo cascade codes.

Speaker: Tetiana Kozynets (Niels Bohr Institute)
• 4:30 PM 5:00 PM
Discussion https://ucph-ku.zoom.us/j/65131069481?pwd=Sk1ZMUlLU3F0NmNlQlFVNkJiNmlUQT09 (Zoom)

### https://ucph-ku.zoom.us/j/65131069481?pwd=Sk1ZMUlLU3F0NmNlQlFVNkJiNmlUQT09

#### Zoom

• Thursday, July 8
• 10:00 AM 11:00 AM
Neutrino Theory & Phenomenology https://ucph-ku.zoom.us/j/65131069481?pwd=Sk1ZMUlLU3F0NmNlQlFVNkJiNmlUQT09 (Zoom)

### https://ucph-ku.zoom.us/j/65131069481?pwd=Sk1ZMUlLU3F0NmNlQlFVNkJiNmlUQT09

#### Zoom

• 10:00 AM
Neutrino Theory & Phenomenology: Lecture III 1h
Speaker: Joachim Kopp (CERN and JGU Mainz)
• 11:00 AM 11:30 AM
Coffee 30m https://gather.town/i/1ezHGAq6 (Gather.town)

### https://gather.town/i/1ezHGAq6

#### Gather.town

• 11:30 AM 12:00 PM
Topical Seminar https://ucph-ku.zoom.us/j/65131069481?pwd=Sk1ZMUlLU3F0NmNlQlFVNkJiNmlUQT09 (Zoom)

### https://ucph-ku.zoom.us/j/65131069481?pwd=Sk1ZMUlLU3F0NmNlQlFVNkJiNmlUQT09

#### Zoom

• 11:30 AM
Neutrinos as a key to a unified theory of particle physics and cosmology 30m
Speaker: Dr Oleg Ruchayskiy (Niels Bohr Institute)
• 12:00 PM 1:30 PM
Lunch 1h 30m https://gather.town/i/1ezHGAq6 (Gather.town)

### https://gather.town/i/1ezHGAq6

#### Gather.town

• 1:30 PM 2:15 PM
Student Talks https://ucph-ku.zoom.us/j/65131069481?pwd=Sk1ZMUlLU3F0NmNlQlFVNkJiNmlUQT09 (Zoom)

### https://ucph-ku.zoom.us/j/65131069481?pwd=Sk1ZMUlLU3F0NmNlQlFVNkJiNmlUQT09

#### Zoom

• 1:30 PM
Exploration of Directionality Capabilities with PROSPECT 15m

The Precision Reactor Oscillation and Spectrum Experiment (PROSPECT) is an above-ground antineutrino experiment at short baselines located at the High Flux Isotope Reactor (HFIR) at Oak Ridge National Laboratory (ORNL). The PROSPECT detector comprises 4-tons of Li-6 doped liquid scintillator (6LiLS) divided into an 11x14 array of optically separated segments. This experiment's physics goals include searching for the existence of sterile neutrinos and precisely measuring the antineutrino energy spectrum. Antineutrinos are detected via the inverse beta decay (IBD) interaction which provides a near-unique space-time correlated signal pair consisting of a positron energy deposition and a delayed neutron capture in the liquid scintillator. The correlation between prompt and delayed pulses/signals is an excellent handle for background suppression. The highly segmented nature of the PROSPECT detector, as well as the double-ended readout structure in each segment, provides good position reconstruction for both prompt and delayed signals. In this talk, I will give an overview of the experiment, as well as current efforts to use the position resolution of the detector and the kinematics of the IBD reaction to study the neutrino directional reconstruction capabilities of PROSPECT.

Speaker: Diego Venegas Vargas (University of Tennessee Knoxville/ Oak Ridge National Laboratory)
• 1:45 PM
Development of a multi-ring $\nu_e$ sample at the T2K far detector 15m

The T2K experiment is a long-baseline accelerator neutrino experiment that measures $\nu_e$ appearance and $\nu_\mu$ disappearance from the $\nu_\mu$ beam by observing neutrino events at the near and far detectors. The near detector (ND280) stands 280 metres, and the far detector (Super Kamiokande) stands 295 km away from the beam production target. Super Kamiokande (SK) is a 50 kton water-Cherenkov detector that observes Cherenkov rings from charged particles produced in neutrino interactions with water.

In the present oscillation analyses, T2K uses only single-ring events at SK which are mostly CCQE. Charged-current single $\pi^+$ events form the second most dominant signal events in $\nu_e$ appearance studies. Thus, the addition of a two-ring CC$1\pi^+$ sample which consists of 1$e$-like ring and 1$\pi^+$-like ring can increase the statistics. These events will also help in studying $\delta_{CP}$ and the octant of $\theta_{23}$. In my studies, I will explore the properties and selection of 2-ring CC$1\pi^+$ events and how they will impact the statistics of $\nu_e$ appearance in T2K analysis.

Speaker: Yashwanth S. Prabhu (NCBJ Warsaw)
• 2:00 PM
Neutrinoless double beta decay search with GERDA and LEGEND 15m

The GERDA and LEGEND-200 experiments were designed to search for the neutrinoless double beta decay of 76-Ge (0νββ: 76Ge →76Se+2e−) in high-purity germanium detectors operated in ultra-pure liquid argon. Their ultimate goal is to shed light on the as-yet-unknown nature of neutrinos and possibly explain the matter-antimatter asymmetry in the universe that would be induced in case neutrinos are their own antiparticles. The most stringent limit on the half-life of 0νββ-decay has been recently set by GERDA, which ended in late 2019 to allow for the construction of its successor, LEGEND-200. The aim of LEGEND-200 is to increase the sensitivity to 0νββ-decay by one order of magnitude. To achieve this goal, an excellent energy resolution and enhanced background vetoing efficiency are crucial. In this talk, I will show the latest results of GERDA and the R&D work for LEGEND, focusing on the construction and characterization of its liquid argon veto.

Speaker: Gabriela Rodrigues Araujo (University of Zurich)
• 2:15 PM 3:30 PM
Self Study and Group Work https://gather.town/i/1ezHGAq6 (Gather.town)

### https://gather.town/i/1ezHGAq6

#### Gather.town

• 3:30 PM 4:00 PM
Coffee 30m https://gather.town/i/1ezHGAq6 (Gather.town)

### https://gather.town/i/1ezHGAq6

#### Gather.town

• 4:00 PM 4:30 PM
Student Talks https://ucph-ku.zoom.us/j/65131069481?pwd=Sk1ZMUlLU3F0NmNlQlFVNkJiNmlUQT09 (Zoom)

### https://ucph-ku.zoom.us/j/65131069481?pwd=Sk1ZMUlLU3F0NmNlQlFVNkJiNmlUQT09

#### Zoom

• 4:00 PM
Multi-wavelength and multi-messenger studies of extragalactic high-energy particle sources 15m

The detection of high energy astrophysical neutrinos at hundreds of TeV is an important step towards the understanding of cosmic-rays origin. However, the origin of such energetic neutrinos is still an open issue. Among the potential extragalactic neutrino sources, blazars are particularly interesting, as suggested by the detection of a high-energy neutrino in the direction of the flaring Blazar TXS 0506+056 in 2017. My PhD research project is focused on the computation and characterization of the broadband spectral energy distribution (SED) of blazar sources, with particular attention to very high energies (VHE). Part of my work is dedicated to the drawing of proposals for simultaneous and multiwavelength observations of interesting sources, together with the data analysis from raw data up to high-level products such as SEDs and lightcurves. The analyses I am working on focus on high energies (Fermi/LAT data) and VHE (MAGIC and LST-1 data). Then, a substantial part of my PhD will comprise a phenomenological description of the SEDs through the development of lepto-hadronic emission models further developing an already existing python code to include all hadronic radiative processes. They will be tested on the candidates in order to better understand the origin of the jet emission and the possible neutrino emission and cosmic-ray acceleration.

Speaker: Ilaria Viale (University and INFN Padova)
• 4:15 PM
Coherent Elastic Neutrino-Nucleus Scattering and its implications in the search of new Physics 15m

The process of Coherent Elastic Neutrino-Nucleus Scattering (CEvNS) has now been measured by the COHERENT collaboration with two different technologies, including CsI and LAr as detection materials. In this work, we use the results from these experiments to constrain parameters of the Standard Model at low energies, such as the weak mixing angle and nuclear physics parameters, through the determination of the neutron rms radius of the target material. We also use the experimental data to constrain new physics parameters in the Non-Standard Interactions approach. We show that data from the latest measurement with LAr, allow to significantly improve the constraints obtained with the results from the first measurement with CsI. In addition, we discuss the results from future measurements with reactor antineutrino sources. We show that they can be combined with accelerator data to get more robust constraints on these parameters, as long as the systematic errors are under control.

Speaker: G. Sanchez Garcia (Cinvestav)
• 4:30 PM 5:00 PM
Discussion https://ucph-ku.zoom.us/j/65131069481?pwd=Sk1ZMUlLU3F0NmNlQlFVNkJiNmlUQT09 (Zoom)

### https://ucph-ku.zoom.us/j/65131069481?pwd=Sk1ZMUlLU3F0NmNlQlFVNkJiNmlUQT09

#### Zoom

• Friday, July 9
• 10:00 AM 11:00 AM
Neutrino Astrophysics & Astronomy https://ucph-ku.zoom.us/j/65131069481?pwd=Sk1ZMUlLU3F0NmNlQlFVNkJiNmlUQT09 (Zoom)

### https://ucph-ku.zoom.us/j/65131069481?pwd=Sk1ZMUlLU3F0NmNlQlFVNkJiNmlUQT09

#### Zoom

• 10:00 AM
Neutrino Astrophysics & Astronomy: Lecture III 1h
Speaker: Foteini Oikonomou (Norwegian University of Science and Technology)
• 11:00 AM 11:15 AM
Coffee 15m https://gather.town/i/1ezHGAq6 (Gather.town)

### https://gather.town/i/1ezHGAq6

#### Gather.town

• 11:15 AM 12:15 PM
Topical Seminar https://ucph-ku.zoom.us/j/65131069481?pwd=Sk1ZMUlLU3F0NmNlQlFVNkJiNmlUQT09 (Zoom)

### https://ucph-ku.zoom.us/j/65131069481?pwd=Sk1ZMUlLU3F0NmNlQlFVNkJiNmlUQT09

#### Zoom

• 11:15 AM
Insights into coherent forward scattering of neutrinos 30m
Speaker: Shashank Shalgar (NBIA)
• 11:45 AM
Neutrinos in the early Universe 30m
Speaker: Rasmus S.L. Hansen (Niels Bohr Institute)
• 12:15 PM 12:45 PM
Discussion https://ucph-ku.zoom.us/j/65131069481?pwd=Sk1ZMUlLU3F0NmNlQlFVNkJiNmlUQT09 (Zoom)

### https://ucph-ku.zoom.us/j/65131069481?pwd=Sk1ZMUlLU3F0NmNlQlFVNkJiNmlUQT09

#### Zoom

• 12:45 PM 1:00 PM
Farewell 15m https://ucph-ku.zoom.us/j/65131069481?pwd=Sk1ZMUlLU3F0NmNlQlFVNkJiNmlUQT09 (Zoom)