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TH Preprints

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2026-04-04
04:27
Fluid perturbations from expanding bubbles in first-order phase transitions / Caprini, Chiara (Geneva U., Dept. Theor. Phys. ; CERN) ; Midiri, Antonino S. (Geneva U., Dept. Theor. Phys.) ; Procacci, Simona (Geneva U., Dept. Theor. Phys.) ; Roper Pol, Alberto (Geneva U., Dept. Theor. Phys.)
We study the power spectrum of the velocity field induced during a first-order phase transition occurring in the radiation-dominated era. [...]
CERN-TH-2026-081 ; arXiv:2604.02240. - 85.
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2026-04-03
05:03
Searching for New Physics Inside Jets with the Herwig 7 Generalised Parton Shower / Kim, Taehee (Seoul Natl. U. (main)) ; Lee, Joon-Bin (Seoul Natl. U. (main)) ; Masouminia, M.R. (Durham U. (main)) ; Seymour, Michael H. (Manchester U. ; CERN) ; Yang, Un-ki (Seoul Natl. U. (main))
This study investigates parton shower evolution incorporating both Standard Model (SM) and beyond-the-Standard-Model (BSM) radiation, focusing on the phenomenology of a massive $Z'$ boson. [...]
CERN-TH-2026-074 ; MCnet-26-05 ; IPPP-26-15 ; arXiv:2604.00617. - 27.
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2026-04-03
05:00
A Pati-Salam realization of the Nelson-Barr mechanism / Murgui, Clara (CERN)
We present a UV completion of the Standard Model in which quarks and leptons are unified under color SU(4). [...]
CERN-TH-2026-033 ; arXiv:2604.00166. - 15.
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2026-04-02
04:05
Baryogenesis from Exploding Primordial Black Holes / Klipfel, Alexandra P. (MIT) ; Vanvlasselaer, Miguel (Brussels U., IIHE ; U. Barcelona (main)) ; Trifinopoulos, Sokratis (MIT ; CERN ; Zurich U.) ; Kaiser, David I. (MIT)
Exploding primordial black holes can source baryon asymmetry soon after the electroweak phase transition, as high-energy Hawking radiation drives ultrarelativistic shocks in the surrounding plasma. [...]
arXiv:2603.29024 ; MIT-CTP/6015 ; CERN-TH-2026-078. - 15.
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2026-04-01
04:34
Two-Loop Spacelike Splitting Amplitudes in Full-Color QCD / Buccioni, Federico (CERN) ; Fang, Hanyu (Shanghai Jiaotong U. ; KLPAC, Shanghai) ; Yan, Kai (Shanghai Jiaotong U. ; KLPAC, Shanghai)
The study of QCD scattering amplitudes in the collinear regime provides crucial insight into the factorization properties of hadronic cross sections. [...]
CERN-TH-2026-066 ; arXiv:2603.27123. - 6.
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2026-04-01
04:29
$\mathfrak{B}$locking Mesogenesis / Baruch, Chaja (Technion) ; Elor, Gilly (Texas U.) ; Goldberg, Jared M. (Technion) ; Shtaif, Omer (Technion) ; Soreq, Yotam (Technion ; CERN)
Mechanisms of Mesogenesis generate the baryon asymmetry and dark matter of the Universe through late-time decays of Standard Model mesons into baryons and dark matter states. [...]
CERN-TH-2026-071 ; arXiv:2603.28330. - 10.
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2026-03-31
04:16
Heavy quark masses from step-scaling / Kuberski, Simon (CERN) ; Conigli, Alessandro (Helmholtz Inst., Mainz ; Darmstadt, GSI) ; Fritzsch, Patrick (Trinity Coll., Dublin) ; Gérardin, Antoine (Marseille, CPT) ; Heitger, Jochen (Munster U., ITP) ; Herdoíza, Gregorio (U. Autonoma, Madrid (main) ; CSIC, Madrid) ; Pena, Carlos (U. Autonoma, Madrid (main) ; CSIC, Madrid) ; Simma, Hubert (DESY) ; Sommer, Rainer (DESY ; Humboldt U., Berlin (main))
We present a determination of the charm- and bottom-quark masses using the heavy-quark step-scaling strategy. [...]
arXiv:2603.25295 ; CERN-TH-2026-068 ; IFT-UAM/CSIC-26-34 ; MS-TP-26-11. - 10.
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2026-03-26
04:57
A Conformal Bridge for the Light Transform of QCD Correlation Functions / Chen, Hao (MIT, Cambridge, CTP) ; Monni, Pier Francesco (CERN) ; Pang, Zhaoyan (Peking U.) ; Vita, Gherardo (CERN) ; Zhu, Hua Xing (Peking U. ; Peking U., CHEP)
Understanding the link between correlation functions (CFs) of local operators and measurable collider correlators has emerged as a new opportunity in the study of gauge theory dynamics at colliders. [...]
arXiv:2603.22388 ; MIT-CTP 6016 ; CERN-TH-2026-005. - 5.
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2026-03-26
04:45
Slow-down of expanding bubbles in the early Universe / Bhusal, Nabeen (DESY) ; Blasi, Simone (DESY) ; Konstandin, Thomas (DESY) ; Perboni, Enrico (DESY) ; van de Vis, Jorinde (CERN)
We study slow-down effects for bubbles formed in a cosmological first-order phase transition (PT) focusing on deflagrations and hybrids, where the bubble wall is preceded by a shockwave of heated plasma. [...]
arXiv:2603.22397 ; CERN-TH-2026-058 ; DESY-26-040. - 34.
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2026-03-26
04:16
What does it take to have $N_{\rm eff} < 3$ at CMB times? / Escudero, Miguel (CERN) ; Ovchynnikov, Maksym (CERN) ; Weiner, Neal (New York U., CCPP)
The vast majority of extensions of the Standard Model affecting the number of effective relativistic neutrino species ($N_{\rm eff}$) do so additively, namely, they enhance this quantity with some light state contributing to dark radiation. [...]
CERN-TH-2026-056 ; arXiv:2603.22391. - 11.
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