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BCVSPIN Conference 2024: Particle Physics and Cosmology in the Himalayas
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Asia/Kathmandu
Kathmandu, Nepal
Kathmandu, Nepal
Anil Thapa
(University of Virginia),
Bibhushan Shakya
(Deutsches Elektronen-Synchrotron (DE)),
Digesh Raut
(Washington College),
Prajita Bhattarai
(SLAC National Accelerator Laboratory (US)),
Santosh Parajuli
(Univ. Illinois at Urbana Champaign (US)),
Suyog Shrestha
(Washington College (US))
Description
Official BCVSPIN Website: bcvspin.org
Contact Email: bcvspinprogram@gmail.com
About BCVSPIN: BCVSPIN-2024 is the continuation of the BCVSPIN (Bangladesh, China, Vietnam, Sri Lanka, Pakistan, India, Nepal) program initiated in 1989 by Professors Abdus Salam, Jogesh Pati, Yu Lu, and Qaisar Shafi with a goal to provide a platform for scientists in the South/Southeast Asia region to learn about developments in particle/astroparticle physics and cosmology from leading experts. Previous editions took place in Nepal (1989, 1990, 1994-97, 2023), India (1992), China (2007, 2009, 2013), Vietnam (2011), and Mexico (2014). The most recent edition was a two week summer school in Kathmandu, Nepal in May 2023, BCVSPIN-2023 (indico page).
2024 BCVSPIN Programms:
This year BCVSPIN is hosting two events in Kathmandu Nepal:BCVSPIN 2024 Particle Physics Masterclass
Dates: December 4-6, 2024Program: The master class is designed for undergraduate and graduate students enrolled at Nepalese institutes and offers a comprehensive introduction to particle physics, high-energy physics (HEP) experiments, and machine learning. Please find the indico page for more details on registration, venue, and agenda.
BCVSPIN 2024 Conference
Dates: December 9-13, 2024
Program: This one week conference will provide a broad coverage of current research in particle physics and cosmology, and include theorists as well as experimentalists. Topics include (but are not limited to): collider physics, cosmology and gravitational waves, dark matter, neutrino physics, particle astrophysics, physics beyond the Standard Model, and machine learning. The primary goal of the event is to facilitate interactions between researchers from BCVSPIN countries and the broader international community. The event is hosted jointly by Tribhuvan University and Kathmandu University.
Venue and Accommodation:
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The conference will take place at Hotel Shanker, a historic 4-star hotel housed in a 19th-century palace at the heart of Kathmandu. It is located near Kathmandu Durbar Square, a UNESCO world heritage site and Thamel, a bustling tourist hub known for its lively atmosphere, which offers a wide selection of food, accommodation, and shopping options. Here is the address to the conference venue/hotel: Hotel Shanker, Lazimpat, Kathmandu 44600, Nepal
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Please find the negotiated rate (including taxes) for rooms, which includes breakfast. Here is the link to book your room: https://www.shankerhotel.com.np/bcvspin-event. Please feel free to email sales@shankerhotel.com or call +977-1-4510151 for further inquiries.
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If you would like to explore other accommodation options, there are plenty of other hotels within walking distance of the conference venue.
Registration Fee:
- Participants from non-BCVSPIN institutions: USD 300
- Participants from BCVSPIN institutions:
- USD 100 for faculty
- Students and postdocs from BCVSPIN institutions presenting at the conference pay no registration fees. Limited financial support is available, priority will be given to students from BCVSPIN institutions.
The registration fee covers coffee breaks, daily lunch, and a conference dinner. The registration fee will be collected on-site during the event. We can only accept cash in USD, Euros, or Nepalese Rupees.
Plenary Talks
- Manjari Bagchi (Inst. of Mathematical Sciences, India)
- P.S. Bhupal Dev (Washington University at St. Louis, USA)
- Amol Dighe (TIFR, India)
- Xiao-Gang He (Shanghai Jiao Tong University, China)
- Anjan Kumar Giri (Indian Inst. Tech., Hyderabad, India)
- Srubabati Goswami (Physical Research Laboratory, India)
- Sudip Jana (Max Planck Institute, Germany)
- Harris P. Kagan (Ohio State University, USA)
- Rukmani Mohanta (University of Hyderabad, India)
- Subhendra Mohanty (Indian Inst. Tech., Kanpur)
- Maxim Perelstein (Cornell University, USA)
- Michael Ratz (University of California Irvine, USA)
- Joshua Ruderman (New York University, USA)
- Brian Shuve (Harvey Mudd, USA)
- Masahide Yamaguchi (Tokyo Inst. Tech., Japan and IBF, South Korea)
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Manjari Bagchi (IMSc Chennai, India)
- Marta Losada (New York University, USA)
- Jan Heisig (RWTH Aachen U, Germany)
- Giulia Riccardi (Naples U, Italy)
- Jessica Turner (Durham U, UK)
- Muchun Chen (UC Irvine, USA)
Special Talks:
- Takaaki Kajita (University of Tokyo, ICRR, Japan, 2015 Nobel Laureate)
Talks by Experimental Collaborations
- CMS Speaker (Gagan Mohanty)
- ATLAS Speaker (Stefano Giagu)
- Belle-II Speaker (Mario Merola)
- ICECUBE Speaker (Mohamed Rameez)
- DUNE Speaker (Alessandro Minotti)
- ALICE Speaker (Amrit Gautam)
- JUNO Speaker (Cong Guo)
- Planck Speaker (Francois Bouchet)
- FCC speaker (Pralay Mal)
- EIC speaker (Daniel Takaki)
Organizing Committee
- Digesh Raut (St. Mary's College of Maryland, USA)
- Suyog Shrestha (Washington College, USA)
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Bibhushan Shakya (DESY, Germany)
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Anil Thapa (Colorado State University, USA)
- Qaisar Shafi (University of Delaware, USA)
- Harikrishnan Ramani (University of Delaware, USA)
- Anish Ghoshal (University of Warsaw, Poland)
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Nausheen Shah (Wayne State University, USA)
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Nobuchika Okada (University of Alabama, USA)
- Pham Quang Hung (University of Virginia, USA)
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Mu-Chun Chen (University of California Irvine, USA)
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Santosh Parajuli (University of Illinois UC, USA)
- Prajita Bhattarai (Brandeis University, USA)
Local Organizing Committee
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Raju Khanal (Tribhuvan University)
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Rajendra Adhikari (Kathmandu University)
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Niraj Dhital (Tribhuvan University)
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Ujjwal Man Joshi (Kathmandu University)
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Om Prakash Niraula (Tribhuvan University)
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Deepak Prasad Subedi (Kathmandu University)
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Dipendra Hamal (Kathmandu University)
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Registration
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Opening Ceremony
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1
WelcomeSpeaker: Qaisar Shafi
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2
Welcome
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3
LogisticsSpeaker: Digesh Raut (St. Mary's College of Maryland)
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1
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Plenary: 1Convener: Bibhushan Shakya (Deutsches Elektronen-Synchrotron (DE))
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4
The KAGRA gravitational wave projectSpeaker: Takaaki Kajita
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5
Dark Matter and Neutrino Mass from a Conformal Dark SectorSpeaker: Prof. Maxim Perelstein (Cornell University)
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4
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10:45
Coffee Break
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Plenary: 2Convener: Anjan Giri
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6
The Path to Future Particle Physics ExperimentsSpeakers: Harris Kagan (O), Harris Kagan (Ohio State University (US))
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7
Cosmic CollidersSpeaker: Bibhushan Shakya (Deutsches Elektronen-Synchrotron (DE))
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8
HEP Research in Nepal: Status and Prospects
Physics and Society
Speaker: Niraj Dhital
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6
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12:30
Lunch Break
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Parallel Session: 1Convener: Santosh Parajuli (Univ. Illinois at Urbana Champaign (US))
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9
LHC Results: Vector-like quark searches from ATLAS
The Standard Model of Particle Physics explains many natural phenomena yet remains incomplete. Vectorlike quarks (VLQs) lie at the heart of many extensions seeking to address the Hierarchy Problem, as they can naturally cancel the mass divergence for the Higgs boson. This talk summarizes recent ATLAS searches for VLQs which decay to quarks, or leptons, using Run 2 data collected at the LHC.
Speaker: Joseph Haley (Oklahoma State University (US)) -
10
LHC Results: Dark Matter Searches at CMS
We report on the search for dark matter conducted at the CMS detector using the full Run-2 dataset from the LHC.This report focuses on the dark matter searches conducted using proton-proton collisions at a center-of-mass energy of 13 TeV with the CMS detector. It highlights the various event types investigated and discusses the findings in relation to several dark matter theories.
Speaker: Mr Shriniketan Acharya (University of Hyderabad,India) -
11
Searches for BSM physics using long-lived signatures with the CMS detector
The latest results on BSM physics searches using long-lived signatures with the CMS detector will be presented.
Speaker: Shubham Dutta (Saha Institute of Nuclear Physics (IN)) -
12
LHC Results: Search for the rare decays of the Higgs and Z boson to a J/Psi or Psi' meson and a photon in CMS at √s = 13 TeV
Results from search for the rare decays of the standard model\,(SM) Higgs and Z boson to a J/$\Psi$ or $\Psi'$ meson and a photon, with subsequent decay of the meson to a pair of muons will be presented in this contribution. The analysis is performed using data recorded by the CMS detector during full Run 2 from proton-proton collisions at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 123 $fb^{-1}$. No excess of events has been observed over the SM background. Upper limit at $95\%$ confidence level are set on the branching fractions of these decay channels.
Speaker: Sweta Baradia (Saha Institute of Nuclear Physics (IN))
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9
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Parallel Session: 2Convener: Lukas Graf (Nikhef)
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13
Accidental quality axion from gauged flavor symmetry
The axion solution to the strong CP problem is closely entwined with the flavor structure of the standard model. So our model attempts at explaining the Flavor puzzle through the a gauged abelian Frogatt Nielsen mechanism and thereby automatically end up with a "quality axion" as the result of a residual anomalous $U(1)_{PQ}$ symmtery. This is achieved in a DFSZ like scenario with a "Flavon" field of the gauged $U(1)_F$ in addition to the PQ scalar. Demanding favorable mass textures, the charges we require to cancel the anomalies naturally provide us an accidental quality axion. Such models provide us with various probes like flavor violating axion couplings, axion DM production and gravitational waves from the decay of domain walls facilitated by the explicit $U(1)_{PQ}$ breaking terms.
Speaker: Sai Charan Chandrasekar (PhD Student at Oklahoma State University) -
14
Structure formation in axion-like Fuzzy Dark Matter (FDM) in String Theory
In recent years, an alternative to the standard ΛCDM model has emerged known as Fuzzy Dark Matter (FDM). We discuss how FDM, characterized by ultra-light bosonic particles with masses on the order of 10^{-22}eV, arises within String Theory constructions, particularly those involving axion-like fields. We study how FDM influences structure formation on astrophysical scales, leading to a suppression of structure formation below a certain threshold, which could resolve several small-scale discrepancies inherent in the ΛCDM model. In this study, we explain how it can be effectively modeled as a non-relativistic quantum system.
Speaker: Somesh Tiwari -
15
Are Fractals Behind Flavor Mixing of the SM?
In the Standard Model of particle physics, each generation of fermion is replicated in all quantum numbers but with a higher mass in the next generation. Three chiral generations have been found so far. Using the replication property as an inspiration we look for fractal geometries to be behind the SM flavor mixing. A realistic model based on Sierpinski geometry on a deconstruction model (fractal dimension) is put forward.
Speaker: Aadarsh Singh -
16
Generalized Symmetries and Model Building
Generalized global symmetries are present in theories of particle physics, and understanding their structure can give insight into these theories and UV completions thereof. We will identify non-invertible chiral symmetries in certain flavorful Z' extensions of the Standard Model, and this will lead us to interesting nonperturbative effects in theories of gauged non-Abelian flavor. For the leptons we will find naturally exponentially small Dirac neutrino masses. In the quark sector, a certain symmetry exists specially because we have the same numbers of colors and generations, and leads us to a massless down-type quarks solution to strong CP in color-flavor unification.
Speaker: Seth Koren (University of Notre Dame)
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13
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15:10
Coffee Break
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17
Oscillating neutrinos
Neutrinos are remarkably interesting particles. Neutrinos have three
types, i.e., electron-neutrinos, muon-neutrinos and tau-neutrinos. They have no electric charge and interact with matter very rarely. Neutrinos have been assumed to be massless. However, if neutrinos have mass, they change their type while propagating in a medium. For example, a muon neutrino may change to a tau-neutrino. These phenomena are called neutrino oscillations. More than 25 years ago, neutrino oscillations were discovered, and therefore it was found that neutrinos have tiny mass. I will discuss the present and future studies of neutrinos, focusing on experiments in Kamioka, Japan.Speaker: Takaaki Kajita
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Plenary: 4Convener: Suyog Shrestha (Washington College (US))
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18
The latest and the near-future physics highlights from the ATLAS experiment
LHC Results: Experiment
Speaker: Stefano Giagu (Sapienza Università di Roma and INFN Roma (IT)) -
19
Latest results and near-future highlights from CMS
LHC Results
Speaker: Gagan Mohanty (Tata Institute of Fundamental Research (IN)) -
20
The latest and the near-future physics highlights from the ALICE experiment
Experiment
Speaker: Amrit Gautam (The University of Kansas (US))
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18
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10:45
Coffee Break
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Plenary: 5Convener: Anil Thapa (Colorado State University)
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22
Modular Symmetries and Neutrino MixingSpeaker: Prof. Mu-Chun Chen (University of California - Irvine)
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12:15
Lunch Break
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Plenary: 6Convener: Dr Sudip Jana (Max-Planck-Institut für Kernphysik)
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23
Flavorful Dark matter and B to K invisible excessSpeaker: Xiao-Gang He
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24
Deciphering Neutrino Non-Standard Interactions
Flavor Physics Theory
Speaker: Anjan Giri -
25
Exploration of Physics beyond the Standard Model with Neutrinos
Theory Flavor
Speaker: Dr. Rukmani Mohanta
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23
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15:30
Coffee Break
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Parallel Session: 3Convener: Roshan Joshi (Ohio State University (US))
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26
Accumulating Evidence for New Higgs Bosons at the LHC
Statistically significant excesses exist at around 152 GeV in associated di-photon production contained in the sidebands of SM Higgs analyses. They are most pronounced in the $\gamma \gamma + \tau$, $\gamma \gamma + \text{MET}$, $\gamma \gamma + \geq 1 \ell +\geq 1b$, $\gamma \gamma + 4 j$ signal regions, and can be explained by the Drell-Yan production of new Higgs bosons, i.e. $p p \to W \to H^\pm 𝐻$. In this context, we first examine the excesses in a simplified model approach, considering the decays of $H^\pm \to \tau \nu, t b, WZ$. We then specialize our analysis for the real Higgs triplet and two-Higgs doublet models, resulting in a combined significance of $\approx 4 \sigma$ and $\approx 4.3 \sigma$, respectively.
Speaker: Sumit Banik (University of Zurich & PSI) -
27
Probing Lepton Number Violation from Low to High Energies
Theory
Speaker: Lukas Graf (Nikhef) -
28
Exploring new physics in the FCNC $B_c \to D_s \nu\Bar{\nu}$ channel
The rare $b\rightarrow s\ell^+ \ell^-$ transition is a well-explored transition, particularly for new physics beyond the standard model. Similar to this transition, another flavor changing neutral current transition $b\rightarrow s\nu \bar{\nu}$ involving a dineutrino pair also plays an important role in the search for new physics. The $B \rightarrow K \nu \bar{\nu}$ mode is one such dineutrino channel that has been been analyzed in many works both within the standard model and beyond standard model framework. In this paper, we investigate the $B_c \rightarrow D_s\nu \bar{\nu}$ decay channel which proceeds via the $b\rightarrow s\nu \bar{\nu}$ transition. We consider an effective Lagrangian framework involving new physics currents. To explore these currents further, we do an analysis within some leptoquark models. In our analysis, we use the form factors that have been obtained in lattice QCD calculations. We then make predictions of some observables related to the $B_c \rightarrow D_s\nu\bar{\nu}$ mode both within the standard model and the leptoquark model.
Speaker: Tarun Kumar (University of Hyderabad) -
29
Probing flavor violation and baryogenesis via primordial gravitational waves
We show that observations of primordial gravitational waves of inflationary origin can shed light into the scale of flavor violation in a flavon model which also explains the mass hierarchy of fermions. The energy density stored in oscillations of the flavon field around the minimum of its potential redshifts as matter and is expected to dominate over radiation in the early universe. At the same time, the evolution of primordial gravitational waves acts as bookkeeping to understand the expansion history of the universe. Importantly, the gravitational wave spectrum is different if there is an early flavon dominated era compared to radiation domination expected from a standard cosmological model and this spectrum gets damped by the entropy released in flavon decays, determined by the mass of the flavon field $m_S$ and new scale of flavor violation $\Lambda_{\rm FV}$. We derive analytical expressions of the frequency above which the spectrum is damped, as-well-as the amount of damping, in terms of $m_S$ and $\Lambda_{\rm FV}=10^{5-10}$. We show that the damping of the gravitational wave spectrum would be detectable at BBO, DECIGO, U-DECIGO, $\mu-$ARES, LISA, CE and ET detectors for $\Lambda_{\rm FV}=10^{5-10}$ GeV and $m_S=\mathcal{O({\rm TeV})}$. Furthermore, the flavon decays can source the baryon asymmetry of the universe. We identify the $m_S-\Lambda_{\rm FV}=10^{5-10}$ parameter space where the observed baryon asymmetry $\eta \sim 10^{-10}$ is produced and can be tested by gravitational wave detectors like LISA and ET. We also discuss our results in the context of the recently measured stochastic gravitational background signals by NANOGrav.
Speaker: Zafri Ahmed Borboruah (IIT Bombay) -
30
Unique observational constraints on generalized Starobinsky inflationary model
The inflationary paradigm of the early universe has been extraordinarily consistent with the observations of the cosmic microwave background radiation,however, we still haven’t found a specific model of inflation that fits well within a high-energy theory. Analysis of recently Planck data shows that many previously popular field theoretical models like quadratic and quartic models of inflation ruled out by constraints of CMB observations. Among these models, the R^2 inflation model given by Starobinsky is strongly favored by observational data. The first self-consistent model of inflation was proposed by Starobinsky in 1980, where inflation is achieved by 1/M^2 R^2 interaction, R being the Ricci scalar, in the Einstein-Hilbert action without additional scalar field. In this talk, I will focus on the Starobinsky model and its generalization. I will discuss the generalization of Starobinsky inflation by considering a power law correction to the Einstein-Hilbert action. Further, we identify any deviations from power law inflation that are consistent with the latest Cosmic Microwave Background (CMB) and Large Scale Structure (LSS) observations.
Speaker: SAISANDRI SAINI (MNIT, Jaipur)
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26
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Parallel Session: 4Convener: Prajita Bhattarai (SLAC National Accelerator Laboratory (US))
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31
Search for new phenomena beyond the Standard Model at Belle and Belle II
Experiment
Speaker: Junewoo PARK (University of Tokyo (BELLE II Experiment)) -
32
Recent results form Belle and Belle II on dark sector searches
Experiment
Speaker: Sungjin Cho -
33
Precision measurements of weak interaction parameters at Belle and Belle II (to include CKM and CPV)
Experiment
Speaker: Ansu Johnson (Indian Institute of Technology Madras) -
34
Recent studies of exotic hadrons from Belle and Belle II
Although in the conventional quark model the hadrons are classified either mesons or baryons, the quantum chromodynamics (QCD) allows other types of hadron states, so-called exotic hadron states, such as tetraquarks, pentaquarks, glueballs, hybrid states, etc. Studies of exotic hadrons therefore could provide crucial information for understanding the detailed structure of strong interactions. In this talk, we present recent studies of exotic hadrons from Belle and Belle II experiments. In particular, we show recent results and prospects from Belle II concerning the properties of $\Upsilon(10753)$, which might be interpreted as exotic. In addition, we present evidence for an excess of events near the mass of a charmed pentaquark state $P_{cs}(4459)^0$ and search for pentaquark states in $\Upsilon(1,2S)$ inclusive decays, both at Belle.
Speaker: Youngjoon Kwon -
35
Study of CP property of ggH coupling in Higgs production associated with two jetsSpeaker: Pratik Kafle
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31
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Conference Dinner
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Plenary: 7Convener: JESSICA TURNER
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36
De Sitter Spacetime and High Frequency Gravitational Waves from String Theory
Theory
Speaker: Fernando Quevedo (The Abdus Salam International Centre for Theoretical Physics) -
37
Light shining through astrophysical walls
Theory
Speaker: Amol Dighe (TIFR) - 38
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36
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10:45
Coffee Break
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Plenary: 8Convener: Brian Shuve (Harvey Mudd College)
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39
Overview of Dark Matter ModelsSpeaker: Joshua Ruderman (Princeton University)
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40
Dark Matter Freeze-out Beyond the WIMP Paradigm
The nature of dark matter poses one of the most pressing questions in fundamental physics today. While the thermal freeze-out of weakly interacting massive particles (WIMPs) has theoretical appeal, its validity is increasingly questioned due to experimental null results from colliders as well as direct and indirect detection experiments. In this talk, we explore dark matter genesis mechanisms beyond the WIMP paradigm, focusing particularly on the mechanism of conversion-driven freeze-out. This mechanism enables the thermalization of dark matter despite its very weak couplings. While the corresponding parameter region evades conventional WIMP searches, it predicts novel signatures of long-lived particles at colliders, making it a prime target for upcoming LHC searches. We review various realizations of this mechanism from the literature, establishing connections to other unresolved problems of the standard model. Notably, we discuss a recently discovered possibility: the simultaneous explanation of the baryon asymmetry of the Universe through conversion-driven leptogenesis within this framework.
Speaker: Jan Heisig
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39
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12:15
Lunch Break (Free Afternoon after Lunch)
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Plenary: 9Convener: Joseph Haley (Oklahoma State University (US))
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41
Latest and near-future highlights from DUNE
Experiment
Speaker: Dr Alessandro Minotti (Universita & INFN, Milano-Bicocca (IT)) -
42
Latest and near-future highlights from BelleSpeaker: Mario Merola (University of Napoli Federico II and INFN - National Institute for Nuclear Physics)
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43
Highlights from the IceCube neutrino observatory
Neutrino Experiment
Speaker: Mohamed Rameez (Tata Institute of Fundamental Research)
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41
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10:45
Coffee Break
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Plenary: 10Convener: Dr. Rukmani Mohanta
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44
Neutrino-Dark Matter Interactions
Theory
Speaker: Bhupal Dev (Washington University in St. Louis) -
45
Unveiling a non-trivial Temporal structure in Neutrino Emissions from SN1
Neutrino Theory
Speaker: Giulia Ricciardi
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44
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12:15
Lunch Break
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Plenary: 11Convener: Niraj Dhital (Central Department of Physics, Tribhuvan University, Kathmandu, Nepal)
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46
Electromagnetic Properties of Neutrino
Neutrino Theory
Speaker: Dr Sudip Jana (Max-Planck-Institut für Kernphysik) -
47
Imaging the Deep Earth with NeutrinosSpeaker: Prof. Sanjib Kumar Agarwalla (Institute of Physics, Bhubaneswar and University of Wisconsin-Madison)
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48
What is AI, what is it not, how we use it in Physics and how it impacts... You.Speaker: Claire David (AIMS South Africa)
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46
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15:30
Coffee Break
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Parallel Session: 5Convener: Dr Jan Heisig (Université catholique de Louvain (UCL))
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49
Exploring Neutrino Oscillations in the Japanese Long-Baseline Experiments
The study of neutrino oscillations provides critical insights into the fundamental properties of neutrinos and their role in the universe. This talk focuses on the contributions of the Japanese long-baseline neutrino experiments to advancing our understanding of neutrino physics, specifically on my role in calibrating the upcoming Hyper-Kamiokande detector.
Speaker: Unik Limbu (University of Liverpool) -
50
Effect of NSI on tripartite entanglement in neutrino oscillations
We investigate the impact of non-standard interactions (NSI), on various measures of tripartite entanglement in the context of three-flavor neutrino oscillations. Our analysis covers key entanglement measures such as concurrence, entanglement of formation (EOF), and negativity, evaluated across various experimental setups. We compare reactor experiments, including Daya Bay, JUNO, and KamLAND, with accelerator-based experiments, such as T2K, MINOS, and DUNE. The results highlight that accelerator experiments, particularly DUNE, show heightened sensitivity to NSI effects, especially at moderate to high neutrino energies. Notably, while negativity is generally weaker than concurrence and EOF, it demonstrates the greatest sensitivity to NSI in accelerator settings. In contrast, reactor experiments exhibit lower sensitivity to NSI. Our study provides insights into the potential of these experiments to probe new physics through entanglement measures.
Speaker: Bhavna Yadav -
51
Probing neutrino self-interactions with JWST data
James Webb Space Telescope (JWST) has revealed a surprisingly high number of UV-bright galax- ies at z ≥ 10. The UV luminosity function at these high redshifts is an excellent probe for studying structure formation on small scales and at high redshifts. Neutrino self-interaction, mediated by a new beyond the Standard Model particle is a well motivated model, that has been tested by a vari- ety of laboratory, astrophysical, and cosmological probes. These interactions suppress the matter power spectrum at small scales through collisional damping and free streaming. We aim to use these JWST observations of high-redshift galaxies as a new probe of neutrino self-interactions. Changes in the power spectrum aided by neutrino self-interactions will influence the halo mass function, which characterizes the distribution of dark matter halo masses. We will probe the un- derlying particle physics parameter and test the viability of this model. Our work highlights the potential of JWST as a powerful tool for providing insights into cosmic structures and offering a pathway to novel discoveries in the Beyond Standard Model sector.
Speaker: Ranjini Mondol -
52
Exploring Legget-Garg type Inequality Violations in Light of NOvA and T2K Anomalies
Recent anomalies observed in NO$\nu$A and T2K experiments within the framework of standard three-flavor neutrino oscillations suggest the possibility of physics beyond the Standard Model (SM). In this study, we investigate the potential violation of Leggett-Garg type inequalities (LGtI) in the context of three-flavor neutrino oscillations, focusing on scenarios involving complex Non-Standard Interactions (NSI) with $\epsilon_{e\mu}$ or $\epsilon_{e\tau}$ couplings in long baseline accelerator experiments, considering both normal and inverted mass ordering. Our analysis reveals that LGtI violation is significantly enhanced in the normal ordering (NO) for the $\epsilon_{e\tau}$ scenario. At the same time, it is suppressed for the $\epsilon_{e\mu}$ scenario in T2K, NO$\nu$A, and DUNE experiments. Moreover, we find that in the case of inverted ordering (IO), the DUNE experimental setup above 6 GeV exhibits LGtI violation, suggesting the possibility of the $\epsilon_{e\tau}$ new physics scenario. These findings shed light on the potential of LGtI as a probe for physics beyond the Standard Model in neutrino oscillation experiments.
Speaker: Lekhashri Konwar -
53
Collider and CMB complementarity of leptophilic dark matter with light Dirac neutrinos
We study the discovery prospects of leptophilic dark matter (DM) in future lepton colliders by considering the light neutrinos to be of Dirac type. Adopting an effective field theory (EFT) approach, we write down dimension six operators connecting the standard model (SM) fields, light Dirac neutrinos and DM. Considering DM relic to be generated via the thermal freeze-out, we check the discovery prospects at future lepton colliders via mono-photon plus missing energy searches. The right chiral parts of light Dirac neutrinos get thermalised due to their interactions with the bath as well as leptophilic DM, leading to enhanced effective relativistic degrees of freedom $N_{\rm eff}$ within reach of future cosmic microwave background (CMB) experiments. The interplay of existing bounds from cosmological observations related to DM relic and $N_{\rm eff}$, direct and indirect detection of DM, astrophysics, and collider observations leave promising discovery prospects at future electron and muon colliders along with complementary signatures at future CMB experiments. Our findings indicate that $\nu_R$ coupling to all SM fermions excludes all accessible parameter space while restricting $\nu_R$ interactions to specific SM fermions or DM alone opens up more viable regions within reach of future lepton colliders.
Speaker: Bhavya Thacker (Indian Institute of Technology Guwahati)
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49
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Parallel Session: 6Convener: Xucheng Gan
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54
SU(5) Grand Unified Theory in five-dimensional brane world scenario
We construct a brane world SU(5) Grand Unified Theory in five-dimensional space-time by using domain walls. The SU(5) gauge symmetry is broken down to the Standard Model gauge group by a domain wall configuration. Matters are localized around the domain walls by the so-called Jackiew-Rebbi mechanism while the gauge fields are localized by the non-minimal coupling between the gauge fields and additional scalars. We propose two models for the Higgs sector which give a solution to the doublet-triplet splitting problem. We also derive the four-dimensional effective theory of our model. We show that the Yukawa couplings in the Standard Model are realized from the Yukawa couplings in the five-dimensional theory through the renormalization group equation analysis with an appropriate choice of parameters.
Speaker: Masato Arai (Yamagata University) -
55
Cosmology in metric affine theories of gravity
The stress energy tensor we all know is related to the existence of a metric. But the metric is not the only character we can take into account when studying a theory of gravity. We can also consider an independent connection. If we do so we will have the hypermomentum tensor in the game too. This can be related to quantities such as torsion and non metricity. What is the role of these quantities? Can we explain some kind of accelerated expansion without relying necessarily on a cosmological constant? These are some of the questions that will be addressed to in this talk.
Speaker: Ilaria Andrei -
56
Exploring wormhole solutions with global monopole charge in the context of $f(Q)$ gravity
This study explores the potential existence of traversable wormholes influenced by a global monopole charge within the $f(Q)$ gravity framework. To elucidate the characteristics of these wormholes, we conducted a comprehensive analysis of wormhole solutions employing three different forms of redshift function under a linear $f(Q)$ model. Wormhole shape functions were derived for barotropic, anisotropic, and isotropic Equations of State (EoS) cases. However, in the isotropic EoS case, the calculated shape function failed to satisfy the asymptotic flatness condition. Additionally, we observed that our obtained shape functions adhered to the flaring-out conditions under an asymptotic background for the remaining EoS cases. Furthermore, we examined the energy conditions at the wormhole throat with a radius $r_0$. We noted the influences of the global monopole's parameter $\eta$, the EoS parameter $\omega$, and $n$ in violating energy conditions, particularly the null energy conditions. Finally, we conducted a stability analysis utilizing the Tolman-Oppenheimer-Volkov (TOV) equation and found that our obtained wormhole solution is stable.
Speaker: MORESHWAR TAYDE -
57
Modular symmetry and mass hierarchies
We investigate mass hierarchies in models with modular flavor symmetries. Several key conclusions arise from the observation that the determinants of mass matrices are one-dimensional vector-valued modular forms. Under some fairly general assumptions, we demonstrate that achieving hierarchical fermion masses requires the VEV of the modulus to be located near one of the critical points in moduli space. We revisit the universal near-critical behavior around these points and classify the resulting mass hierarchies for them. Lastly, we comment on the importance of coefficients in the expansion of modular forms and propose the Flavor Moonshine Conjecture.
Speaker: Dr Xiang-Gan Liu -
58
A Semi-analytic Approach for Curvaton Scenario
Curvaton mechanism provides an alternative way to explain the origin of the observed primordial scalar fluctuations in the Cosmic Microwave Background (CMB) radiation. In this scenario, the curvaton is a scalar field which nearly remains frozen during inflation but produces isocurvature perturbations. It starts to evolve after the end of inflation, and at the time of it's decay it converts the isocurvature perturbations to the observed scalar fluctuations. The estimation of the CMB observables i,e the scalar power spectrum and bispectrum relies on the form of curvaton potential. For a quadratic curvaton potential the observables can be estimated analytically, but for a non-trivial potential numerical methods are required. Though analytical methods are applied to deal with the non-trivial potentials, these methods often approximate that the energy density of the curvaton behaves similar to that of a quadratic potential. In this talk we will present an alternative semi-analytic method to deal with general curvaton potential, which is based on the $\delta N$ formalism. Our method is more precise than the existing methods and known results can be reproduced in the quadratic limit.
Speaker: Abhishek Naskar (ShanghaiTech University)
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54
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Plenary: 12Convener: Bhupal Dev (Washington University in St. Louis)
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59
The CMB frontier: Status and prospects
Experiment
Speaker: Francois BOUCHET -
60
EIC Overview
Experiment
Speaker: Daniel Tapia Takaki (University of Kansas) -
61
FCC Overview
Experimental
Speaker: Prolay Mal (National Institute of Science Education and Research (NISER) (IN))
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59
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10:45
Coffee Break
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Plenary: 13Convener: Prof. Mu-Chun Chen (University of California - Irvine)
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62
Hidden Sectors in the Early Universe and Today
Hidden sectors can give rise to novel dynamics in the early universe, and correlated signatures in experiments today. I will discuss some examples of thermal and non-thermal hidden sectors that can account for dark matter and/or the baryon asymmetry, and present new results and prospects for experimental searches that improve our sensitivity to these hidden sectors.
Speaker: Brian Shuve (Harvey Mudd College) -
63
Primordial Black Holes and the Early UniverseSpeaker: JESSICA TURNER
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62
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12:15
Lunch
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Plenary: 14Convener: Michael Ratz
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64
Quantum tunneling in curved spacetime
Theory
Speaker: Masahide Yamaguchi (Tokyo Institute of Technology) -
65
Radio pulsars as the best (natural) laboratory to test aspects of fundamental physics
Neutron stars are rapidly spinning, highly magnetised, extremely dense compact stars. They are believed to be composed of mostly neutrons and some amount of other baryons. There are even theories that free quarks exist near the core of neutron stars. Hence, knowing the properties of neutron stars observationally help us understand properties of matter at extreme densities. Neutron stars are best studied as radio pulsars. Timing analysis of radio pulsars in highly relativistic binary systems can lead to better constraints. This is possible via measurements of the mass of the pulsar and its
moment of inertia simultaneously. The mass measurement is possible by measuring multiple post-Keplerian parameters that include the decay of the orbital period, periastron precession,
Einstein delay, and Shapiro delay. The measurement of the moment of inertia is possible by decoupling the post-Newtonian terms and the frame-dragging term from the periastron
precession. However, to decouple the effect of the frame-dragging, the binary system should satisfy some specific criteria, most of which are satisfied for the double pulsar system.
Binary pulsars are also used to reconfirm general relativity and put limits on various alternative theories. Finally, radio pulsars can be used to detect low frequency (nano-Hz) gravitational waves originating from inspirals of supermassive black holes or cosmological reasons through experiments known as 'Pulsar Timing Array'. In this talk, I will touch above points, how radio pulsar observations can constrain the Equation of State of the dense matter, test theories of gravity and detect low-frequency gravitational waves.Speaker: Manjari Bagchi -
66
CERN International Relations
Physics and Society
Speaker: Luciano Musa (CERN)
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64
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15:30
Coffee Break
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Parallel Session: 7
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68
Lights on the Dark using EFT approach
Dark Matter (DM) has become one of the major shortcomings of Standard Model (SM) of Particle Physics. We consider a model independent approach to search for Dark Matter in the context of HL-LHC (High Luminosity Large Hadron Collider) where our DM candidate is a Dirac-like fermion. In this analysis, we present the effect of one dimension-6 and two dimension-7 effective opertors who are responsible for DM-SM interactions. We have constrained our parameter space i.e., the values of the Wilson Coefficients using the recent experimental results from Direct Detection experiments and PLANCK collaboration. We also show that the fermion DM may generate a distinguishable signature at the LHC when pair-produced in association with a SM Higgs which further decays to a pair of b-quarks. We represent a comparative study of signal-background analysis using usual Cut-Based approach and Boosted-Decision Tree (BDT) method. It shows that for Cut-Based analysis, the signal significance varies from 3.8 $\sigma$ to 0.9 $\sigma$ for DM-mass range of 90-300 GeV, whereas for BDT, it runs from 6.6 $\sigma$ to 1.7 $\sigma$ for same signal and similar mass range of DM.
Speaker: Ms Sanchari Bhattacharyya (Indian Institute of Science) -
69
Neutron Stars with BHF Modified Density-Dependent Nucleon Masses and Weakly Interacting Dark Matter
The phenomenology community has extensively investigated the extreme conditions of matter within fermionic dark matter (FDM) admixed neutron stars using various effective field theories. A popular model in this context is hereby referred to as the σ − ω − ρ + FDM model, which incorporates fermionic dark matter interacting with baryonic matter through new scalar and vector mediators. However, previous studies have overlooked the impact of medium effects on the effective masses of nucleons. In this work, we address this oversight by taking into account a density-dependent effective mass for nucleons derived from the Brueckner-Hartree-Fock many-body approach. We systematically examine how this modification influences the equations of state of neutron star matter and, subsequently, the macroscopic properties of neutron stars, including their rotational characteristics. Our results demonstrate that incorporating the effective mass correction leads to improved agreement with recent experimental observations. Additionally, we derive constraints on the model parameters and provide predictions regarding the masses of neutron stars and the distributions of dark matter within the cores of neutron stars.
Speaker: Mr Arijit Das (Indian Institute of Science Education and Research, Thiruvananthapuram, India) -
70
Exploring High-Energy Neutrino Sources: A Comprehensive Analysis
The sources of high-energy astrophysical neutrino events are still unknown. We searched sources at an angular separation of 3 degrees from the neutrino event positions. out of 340 high energy astrophysical neutrinos, 262 were found to coincide with the positions of the blazar sources. The coincident number of blazar sources is 460. Nine of these sources had a maximum of four neutrino events around them. From light curve follow up observations, we investigated whether these neutrino events originated from these sources. Among nine sources, the source 4FGL J1012.3+0629 was in the most flaring state during the detection time of the neutrino events. In the sources 4FGL J2226.8+0051 and 4FGL J2227.9+0036, we observe higher photon flux in the vicinity of the neutrino events. In sources 4FGL J1016.0+0512, 4FGL J1018.4+0528, 4FGL J0506.9+0323, 4FGL J2223.3+0102 and 4FGL J2252.6+1245, there is no sign of flaring activity during the neutrino event detection time. Our study showed that the sources 4FGL J1012.3+0629, 4FGL J2118.0+0019, 4FGL J2226.8+0051 and 4FGL J2227.9+0036 as a high energy plausible neutrino sources.
Speaker: Mr Rajendra Neupane (Central Department of Physics, Tribhuvan University, Kathmandu, Nepal) -
71
Ultraheavy multiscattering dark matter: DUNE, CYGNUS, kilotonne detectors, and tidal streams
For scattering cross sections large enough to make the detector in direct searches optically thick to
the incident dark matter, dedicated multi-scatter signatures are being sought. We provide some sig-
nificant updates to the multi-scatter program. First, we refine earlier treatments of the dark matter
flux through detectors, generalizing to arbitrary geometries and velocity distributions. Using this
and considerations of energy deposition, we derive the reaches in cross section and mass of various
proposed large volume-detectors. These include a kilotonne fiducial mass “module of opportunity”
at DUNE, a kilotonne xenon detector suggested for neutrinoless double beta decay, the gaseous de-
tector CYGNUS, and the dark matter detectors XLZD and Argo. We show that where the velocity
vector can be reconstructed event-by-event, key properties of the local velocity distribution such as
the mean speed can be marked, and tidal streams can be picked up if they make up about 10% of
the local dark matter density.Speaker: Harsh Aggarwal (Indian Institute of Technology, Kharagpur)
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Parallel Session: 8Convener: Susan Bataju (Southern Methodist University (US))
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72
Inflationary Gravitational waves as test for low scale leptogenesis
We study thermal and non-thermal resonant leptogenesis in a general setting where a heavy scalar $\phi$ decays to right-handed neutrinos (RHNs) whose further out-of-equilibrium decay generates the required lepton asymmetry. Domination of the energy budget of the Universe by the $\phi$ or the RHNs alters the evolution history of the primordial gravitational waves (PGW) of inflationary origin, which re-enter the horizon after inflation, modifying the spectral shape. The decays of $\phi$ and RHNs release entropy into the early Universe while nearly degenerate RHNs facilitate low and intermediate-scale leptogenesis. We show that depending on the coupling $y_R$ of $\phi$ to radiation species, RHNs can achieve thermal abundance before decaying, which gives rise to thermal leptogenesis. A characteristic damping of the GW spectrum resulting in knee-like features would provide evidence for low-scale thermal and non-thermal leptogenesis. We explore the parameter space for the lightest right-handed neutrino mass $M_1\in[10^2,10^{14}]$ GeV and washout parameter $K$ that depends on the light-heavy neutrino Yukawa couplings $\lambda$,
in the weak ($K < 1$) and strong ($K > 1$) washout regimes. The resulting novel features compatible with observed baryon asymmetry are detectable by future experiments like LISA and ET. By estimating signal-to-noise ratio (SNR) for upcoming GW experiments, we investigate the effect of the scalar mass $M_\phi$ and reheating temperature $T_\phi$, which depends on the $\phi-N$ Yukawa couplings $y_N$.Speaker: Ms Lekhika Malhotra (Indian Institute of Technology Bombay) -
73
The vGeN neutrino experiment at the Kalinin NPP
The vGeN experiment is performed at the Kalinin Nuclear Power Plant at a distance of 11 m from the center of the reactor core. The goals of the experiment include observation of coherent elastic scattering of reactor antineutrinos off nuclei (CEvNS) and search for the magnetic moment of antineutrino (NMM) using a 1.4 kg low-threshold germanium detector. Based on the data from September 2022 to May 2023 we report a 90% C.L. upper limit on CEvNS cross-section of 4.3/1.4 times larger than the Standard model prediction (depending on the value of germanium recoils quenching factor). The 90% C.L. sensitivity of νGeN to NMM evaluated for the same dataset is 5.3⋅10−11 μB. The increase of the setup exposition up to 1100 kg⋅days allows to aim for an upper limit of 2.6⋅10−11μB.
Speaker: Alexey Konovalov (LPI/MEPhI) -
74
Design, Development and Characterization of Liquid Organic Scintillation Detector
We propose an experiment focused on designing and developing a liquid organic scintillation detector, along with its characterization using a photomultiplier tube for scintillation counting and high-energy particle detection. The experiment aims to optimize conditions for long-term stability, low background noise, high gain, and a high signal-to-noise ratio. We will also examine the system's energy resolution, pulse response time, and plateau characteristics. Additionally, the experiment will assess environmental radiation levels and calibrate the gamma-ray photopeak based on the material used.
Keywords- Nuclear Instrumentation, PMT, Scintillating MaterialSpeaker: Sunil Kumar Saini (CENTRAL UNIVERSITY OF SOUTH BIHAR) -
75
Searching for Multi-Messenger Events with LIGO-Virgo-KAGRA
Multi-messenger LIGO
Speaker: Naresh Adhikari -
76
Simulating Negative Hydrogen ion acceleration in LINAC-4 using Unity 3DSpeaker: manula dissanayake (University of Ruhuna, Sri Lanka)
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72
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