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Kirtimaan Ajaykant Mohan25/04/2026, 09:00
We present a new determination of the strong coupling constant $\alpha_s$ from a global QCD analysis CT25 of parton distribution functions (PDFs) that incorporates high-precision experimental measurements from Run-2 of the Large Hadron Collider together with a large sample of other measurements over a wide interval of energies. In addition to providing an up-to-date determination of...
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Mario Flores-Hernández (University of Notre Dame)25/04/2026, 09:15
We study the decays $h \to \ell \bar{\ell} \left(Z \to \ell' \bar{\ell'}\right)$ and $h\to\ell\bar{\nu}_\ell\nu_{\ell'}\bar{\ell'}$ within the SMEFT framework and including effects up to $\mathcal O(1/\Lambda^4)$, where $\Lambda$ is the new physics scale suppressing higher dimensional operators. To work to this order, we must include the square of dimension-six operators and the interference...
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Stanford Broadwater (University of Kentucky)25/04/2026, 09:30
Models that explain baryogenesis and the dark matter abundance often feature exotic decays of baryons. As in Elor et al. (2019), we minimally extend the Standard Model with a GeV scale dark Majorana fermion $\chi$ and a TeV scale Y scalar with hypercharge of either 2/3 or -1/3. For exotic neutron or hyperon decays, we can constrain quark flavor couplings $|y_{\chi i}y_{jk}|$ to this Y scalar...
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Sohini Pal (University of Cincinnati, Cincinnati, OH 45221, USA)25/04/2026, 09:45
Baryon number violation (BNV) provides one of the most sensitive probes of physics beyond the Standard Model. In this work, we investigate rare BNV tau decays induced by effective field theory (EFT) operators, including scenarios with associated dark-sector final states. We demonstrate that any framework generating BNV tau decays necessarily induces proton decay, leading to stringent...
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Prof. Rachel Houtz (University of Florida)25/04/2026, 10:15
Effective field theories contain redundancies associated with field redefinitions, which can make even simple calculations unnecessarily complicated. A useful way to organize these redundancies is to view them geometrically, treating field redefinitions as coordinate transformations. In this talk, I will describe how this perspective can be used in practice, focusing on a shortcut to...
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Isaac Wang25/04/2026, 11:30
A precise determination of the bubble wall velocity $v_w$ is crucial for making accurate predictions of the baryon asymmetry and gravitational wave (GW) signals in models of electroweak baryogenesis (EWBG).
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Working in the local thermal equilibrium approximation, we exploit entropy conservation to present efficient algorithms for computing $v_w$, significantly streamlining the calculation.
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Daven Wei Ren Ho25/04/2026, 11:45
Cosmological first-order phase transitions (FOPT) can occur in a secluded dark sector at relatively late times before recombination. Since bubble nucleation occurs stochastically as the FOPT unfolds, different regions of the universe transition at different times. On large scales, this random fluctuation sources a scalar curvature perturbation with a dimensionless power spectrum that scales...
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Taegyu Lee (Indiana University)25/04/2026, 12:00
Recent pulsar timing array observations have reported evidence for a common low frequency signal consistent with a stochastic gravitational wave background. In this work, we investigate the cosmic string interpretation of this signal in a non standard cosmological history featuring an early matter dominated era followed by a kination phase between the standard radiation dominated epoch....
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Yunjia Bao (University of Chicago)25/04/2026, 12:15
We propose a general framework in which a phase transition is triggered during cosmic inflation by the slow-roll dynamics of a spectator field. The topological defects formed at the transition are inflated outside the horizon, reenter it after inflation, and can subsequently generate characteristic gravitational-wave (GW) signals. Quantum fluctuations of the spectator field modulate the timing...
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Santiago Agui Salcedo (Kavli Institute for Cosmological Physics)25/04/2026, 12:30
There is an increasing interest in the interplay between Open Quantum Systems and Inflationary Physics. A time-dependent background and limited access to the degrees of freedom invite the use of Open Quantum systems. It provides a more general framework than the unitary time evolution of a free state. In this talk, based on 2404.15416 and 2507.03103, we develop a local EFT for the scalar...
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Prof. Carlos Blanco (Penn State)25/04/2026, 14:00
The systematic discovery of optimal sub-GeV dark matter targets, such as anisotropic molecular crystals and nanomaterials, is bottlenecked by the computational cost of evaluating complex many-body scattering form factors. In this talk, I will present a novel machine learning framework designed to overcome this barrier by high-throughput screening through the vastness of material space. I will...
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Julian Rovner (University of Cincinnati)25/04/2026, 15:00
The neutrino fog represents a fundamental irreducible sensitivity limit for dark matter direct detection arising from coherent elastic neutrino-nucleus scattering (CEvNS). We present a precision calculation of the neutrino fog for spin-independent (SI), spin-dependent proton-coupled (SDp), and spin-dependent neutron-coupled (SDn) WIMP interactions on a natural xenon target, derived by matching...
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Nicolas Lam25/04/2026, 15:15
Warm dark matter (WDM) particles lighter than O(keV) are excluded at high significance because their early free-streaming strongly suppresses the formation of small-scale structure. However, recent work has suggested that introducing a small fraction of cold dark matter (CDM) with a blue-tilted isocurvature can counteract this suppression, potentially allowing lighter WDM candidates. In this...
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Alexander Takla25/04/2026, 15:30
The singlet-doublet fermion model of dark matter is an economical weak-scale dark matter model, which realizes the dark matter abundance through interactions with the weak bosons of the Standard Model. Depending on the size of the Yukawa couplings in the model, the dark matter relic abundance can be realized via freeze-out (including co-annihilation), co-scattering, freeze-in, or a super WIMP...
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Dawid Brzeminski25/04/2026, 15:45
Ultralight dark matter with quadratic couplings to the Standard Model need not have a homogeneous local profile. Scattering on macroscopic bodies can distort the field configuration near Earth and, for sufficiently large couplings, the atmosphere acts as an efficient shield. I will discuss this effect in the context of clock searches and show that space-based platforms offer a natural way...
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Justin Cammarota (University of Kentucky)25/04/2026, 16:00
Leveraging the joint QCD and QED factorization of DIS, with its improved sensitivity and reduced uncertainties in radiative corrections, opens new windows on the possibility of exotic particle emission, such as weakly coupled particles originating from a dark or hidden sector. Measurements of the cross-section would provide evidence through anomalous energy loss, as opposed to bump hunt or...
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Hengameh Bagherian (University of Chicago)25/04/2026, 16:45
We propose a minimal and natural dark-sector framework in which dark matter is composed of magnetic monopoles coupled to a light axion field. Through the Witten effect, the axion background induces electric charge on the monopoles, turning them into dyons that in turn modify the axion potential. This monopole-dependent axion mass provides a simple, radiatively stable mechanism for dark-sector...
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Katherine Schwind (The Ohio State University)25/04/2026, 17:00
This talk will explore effective operator models where new light exotic (LEX) states interact with the Standard Model (SM) through the W-gluon portal. Operators included in this talk will contain LEX states with non-trivial representations under the SM gauge groups that couple to at least one W boson and one gluon. The W-gluon portal introduces new single production collider modes and...
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Kort Beck (University of Illinois Urbana-Champaign)25/04/2026, 17:15
The presence of mixed ’t Hooft anomalies between zero and one-form symmetries could further constrain the possible low energy phases of gauge theories. By first constructing the full global symmetry group that acts faithfully on the fermions, we compute all the 't Hooft anomalies in the UV regime, which include mixed anomalies between one-form and zero-form symmetries, for a large class of...
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Daniil Volkov25/04/2026, 17:30
We present the first complete two-loop calculation of the electric and chromo-electric dipole moments of the light quarks and the gluon, as well as contributions to CP-violating lepton-quark interactions, in the unconstrained two-Higgs doublet model. We include the most general Yukawa interactions of the Higgs doublets with the Standard Model fermions up to quadratic order, and allow for...
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Nityaansh Parekh (Michigan State University (US))
The diphoton decay channel of the Higgs boson provides a clean experimental signature despite its small branching ratio. At high Higgs transverse momenta, the signal-to-background ratio improves considerably, though with lower statistics. This phenomenological study aims to enhance the separation of the Higgs signal from the diphoton background in this high pT regime using event-level...
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