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2025-11-12
05:01
Magnusian: Relating the Eikonal Phase, the On-Shell Action, and the Scattering Generator / Kim, Jung-Wook (CERN ; Potsdam, Max Planck Inst.) ; Patil, Raj (Potsdam, Max Planck Inst. ; Humboldt U., Berlin) ; Scheopner, Trevor (Potsdam, Max Planck Inst.) ; Steinhoff, Jan (Potsdam, Max Planck Inst.)
Two fundamentally distinct quantities are both called "eikonal" in present amplitudes literature. [...]
CERN-TH-2025-226 ; HU-EP-25/37-RTG ; arXiv:2511.05649. - 35.
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2025-11-12
05:01
The size of the quark-gluon plasma in ultracentral collisions: impact of initial density fluctuations on the average transverse momentum / Zhou, Fabian (U. Heidelberg, ITP) ; Giacalone, Giuliano (CERN) ; Ollitrault, Jean-Yves (IPhT, Saclay)
Recent experiments have shown that the mean transverse momentum $\langle p_T\rangle$ of outgoing particles increases as a function of the particle multiplicity in ultracentral nucleus-nucleus collisions at collider energies. [...]
CERN-TH-2025-228 ; arXiv:2511.04605. - 11.
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2025-11-11
05:27
Large-Scale Structure Probes of the Post-Inflationary Axiverse / Gorghetto, Marco (DESY) ; Trifinopoulos, Sokratis (CERN ; Zurich U.) ; Valogiannis, Georgios (Chicago U. ; Chicago U., KICP)
We study the cosmology of axions in the post-inflationary scenario, where random initial conditions and the ensuing string-domain-wall network generate an isocurvature power spectrum. [...]
DESY-25-147 ; CERN-TH-2025-193 ; arXiv:2511.04734. - 32.
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2025-11-11
05:23
The $Zα^2$ correction to superallowed beta decays in effective field theory and implications for $|V_{ud}|$ / Cao, Zehua (Kentucky U.) ; Hill, Richard J. (Kentucky U. ; Fermilab) ; Plestid, Ryan (Caltech ; CERN) ; Vander Griend, Peter (Kentucky U. ; Fermilab)
Superallowed ($0^+\rightarrow0^+$) beta decays currently provide the most precise extraction of quark mixing in the Standard Model. [...]
FERMILAB-PUB-25-0773-T ; CALT-TH-2025-032 ; CERN-TH-2025-20 ; arXiv:2511.05446. - 21.
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2025-11-11
04:30
Fast and Flexible Neutrino Decoupling Part I: The Standard Model / Escudero, M. (CERN) ; Jackson, G. (SUBATECH, Nantes) ; Laine, M. (U. Bern (main)) ; Sandner, S. (Los Alamos)
Cosmological determinations of the number of relativistic neutrino species, $N^{ }_{\rm eff}$, are becoming increasingly accurate, and further improvements are expected both from CMB and BBN data. [...]
LA-UR-25-30442 ; CERN-TH-2025-225 ; arXiv:2511.04747. - 34.
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2025-11-06
04:15
The Price of a Large Electron Yukawa Modification / Allwicher, Lukas (DESY) ; McCullough, Matthew (CERN) ; Renner, Sophie (Glasgow U.) ; Rocha, Duncan (CERN ; Fermilab ; U. Chicago (main)) ; Smith, Benjamin (Glasgow U.)
The theoretical implications of an electron Yukawa modification are considered in the context of a possible Higgs pole run at FCC-ee, aimed at bounding this coupling. [...]
CERN-TH-2025-201 ; DESY-25-142 ; arXiv:2511.02642. - 42.
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2025-11-06
04:13
Near-extremal membranes in M-theory / Buchel, Alex (Western Ontario U.) ; Monten, Ruben (CERN)
We consider near-extremal membranes embedded in M-theory, consistently truncated to gauged $\mathcal{N} = 2$ supergravity in four dimensions on the coset space $M^{1,1,0}$. [...]
CERN-TH-2025-224 ; arXiv:2511.01974. - 38.
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2025-11-06
04:13
Hadronic scattering in (1+1)D SU(2) lattice gauge theory from tensor networks / Barata, João (CERN) ; Hormaza, Juan (Colombia, U. Natl.) ; Kang, Zhong-Bo (UCLA) ; Qian, Wenyang (Santiago de Compostela U., IGFAE)
We present a first real-time study of hadronic scattering in a (1+1)-dimensional SU(2) lattice gauge theory with fundamental fermions using tensor-network techniques. [...]
CERN-TH-2025-214 ; arXiv:2511.00154. - 17.
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2025-11-05
04:14
Nucleosynthesis and CMB bounds on photophilic ALPs: a fresh look / Escudero, Miguel (CERN) ; Garcia-Perez, Clara (CERN ; Zaragoza U.) ; Ovchynnikov, Maksym (CERN)
We provide a fresh look at the cosmological constraints on axion-like particles (ALPs) that couple predominantly to photons, focusing on lifetimes $τ_{a} \lesssim 10^{4}\, {\rm s}$ and masses $m_a\lesssim 10\,{\rm GeV}$. [...]
CERN-TH-2025-222 ; arXiv:2511.00157. - 8.
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2025-11-05
04:11
opbasis - a Python package to derive minimal operator bases / Husung, Nikolai (CERN ; Madrid, IFT ; Madrid, Autonoma U.)
Finding a complete and yet minimal on-shell basis of operators of a given mass-dimension that are compatible with a specific set of transformation properties is the first step in any Effective Field Theory description. [...]
CERN-TH-2025-223 ; IFT-UAM/CSIC-25-138 ; arXiv:2511.00165. - 23.
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