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2025-08-14
05:01
Precision calculation of $N_{\text{eff}}$ with Neutrino Direct Simulation Monte Carlo / Ihnatenko, Oleksii (Taras Shevchenko U.) ; Ovchynnikov, Maksym (CERN)
Neutrino Direct Simulation Monte Carlo approach ($ν$DSMC) is a method of solving the neutrino Boltzmann equation in the Early Universe, proposed to study the evolution of neutrinos under various cosmological setups. [...]
CERN-TH-2025-158 ; arXiv:2508.08379. - 13.
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2025-08-14
04:59
A Compact Story of Positivity in de Sitter / Chakraborty, Priyesh (Harvard U.) ; Cohen, Timothy (CERN ; Ecole Polytechnique, Lausanne ; Oregon U.) ; Green, Daniel (UC, San Diego) ; Huang, Yiwen (UC, San Diego)
Recent developments have yielded significant progress towards systematically understanding loop corrections to de Sitter (dS) correlators. [...]
CERN-TH-2025-154 ; arXiv:2508.08359. - 51.
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2025-08-12
07:41
Cancellation of one-loop correction to soft tensor power spectrum / Ema, Yohei (CERN) ; Hong, Muzi (Tokyo U. ; Tokyo U., IPMU ; Tokyo U., RESCEU) ; Jinno, Ryusuke (Kobe U.) ; Mukaida, Kyohei (KEK, Tsukuba ; Sokendai, Tsukuba)
We demonstrate that there are no scale-invariant one-loop corrections to the superhorizon tensor perturbations from small-scale (potentially enhanced) scalar perturbations, irrespective of the details of inflationary background time evolution. [...]
CERN-TH-2025-117 ; RESCEU-14/25 ; IPMU25-0030 ; KOBE-COSMO-25-13 ; KEK-TH-2731 ; arXiv:2506.15780. - 13.
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2025-08-09
04:16
Effective Field Theory Constraints on Primordial Black Holes from the High-Redshift Lyman-$α$ Forest / Ivanov, Mikhail M. (MIT) ; Trifinopoulos, Sokratis (MIT ; CERN ; Zurich U.)
We present updated constraints on the abundance of primordial black holes (PBHs) dark matter from the high-redshift Lyman-$α$ forest data from MIKE/HIRES experiments. [...]
MIT-CTP/5895 ; CERN-TH-2025-155 ; arXiv:2508.04767. - 4.
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2025-08-08
04:42
Flavour Physics Beyond the Standard Model / Altmannshofer, Wolfgang (UC, Santa Cruz, Inst. Part. Phys.) ; Stangl, Peter (CERN)
Flavour physics plays a central role in the search for physics beyond the Standard Model, posing fundamental questions whose answers may point to new physics scales far above the electroweak scale. [...]
CERN-TH-2025-156 ; arXiv:2508.03950. - 33.
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2025-08-06
04:42
Lattice Calculation of Short-Range Contributions to Neutrinoless Double-Beta Decay $π^-\toπ^+ ee$ at Physical Pion Mass / Boyle, Peter (Brookhaven ; Edinburgh U.) ; Erben, Felix (CERN) ; Feng, Xu (Peking U. ; CICQM, Beijing ; Peking U., CHEP ; Southampton U.) ; Flynn, Jonathan M. (Southampton U.) ; Garron, Nicolas (Liverpool U. ; Liverpool U., Dept. Math. ; RIKEN BNL) ; Izubuchi, Taku (Brookhaven ; Edinburgh U.) ; Jin, Luchang (Connecticut U.) ; Mukherjee, Rajnandini (Edinburgh U. ; Southampton U.) ; Tsang, J. Tobias (CERN ; Liverpool U., Dept. Math. ; RIKEN BNL) ; Tuo, Xin-Yu (Brookhaven ; Edinburgh U.)
Neutrinoless double-beta ($0νββ$) decays provide an excellent probe for determining whether neutrinos are Dirac or Majorana fermions. [...]
arXiv:2508.01900 ; CERN-TH-2025-132. - 26.
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2025-08-06
04:41
On the Edge of Safety: Charge-Charge Correlation in the Back-to-Back Limit / Monni, Pier Francesco (CERN) ; Vita, Gherardo (CERN) ; Xu, Zhen (Zhejiang U., Inst. Mod. Phys.) ; Zhu, Hua Xing (Peking U. ; Peking U., CHEP)
We investigate the Charge-Charge Correlation (QQC) in electron-positron annihilation as a probe of charge dynamics in Quantum Chromodynamics. [...]
arXiv:2508.00977 ; CERN-TH-2025-150. - 5.
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2025-08-05
04:37
The SN 1987A Cooling Bound on Dark Matter Absorption in Electron Targets / Manzari, Claudio Andrea (UC, Berkeley ; LBL, Berkeley) ; Martin Camalich, Jorge (IAC, La Laguna ; Laguna U., Tenerife ; CERN) ; Spinner, Jonas (U. Heidelberg, ITP) ; Ziegler, Robert (U. Heidelberg, ITP ; KIT, Karlsruhe, TTP)
We present new supernova (SN 1987A) cooling bounds on sub-MeV fermionic dark matter with effective couplings to electrons. [...]
arXiv:2508.00725 ; CERN-TH-2025-152 ; TTP25-024 ; P3H-25-052. - 19.
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2025-08-02
04:49
One-Loop Calculations in Effective Field Theories with GoSam-3.0 / Braun, Jens (KIT, Karlsruhe, TP) ; Campillo Aveleira, Benjamin (KIT, Karlsruhe, TP) ; Heinrich, Gudrun (KIT, Karlsruhe, TP) ; Höfer, Marius (KIT, Karlsruhe, TP) ; Jones, Stephen P. (Durham U., IPPP) ; Kerner, Matthias (KIT, Karlsruhe, TP) ; Lang, Jannis (KIT, Karlsruhe, TP) ; Magerya, Vitaly (CERN)
We present a major update of the one-loop generator GoSam, containing performance improvements as well as new features, in particular functionalities that facilitate calculations beyond the Standard Model in Effective Field Theory frameworks..
arXiv:2507.23549 ; KA-TP-21-2025 ; P3H-25-051 ; IPPP/25/50 ; CERN-TH-2025-134. - 23.
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2025-08-01
04:26
Recoil-Safe Subtraction, Matching and Merging in e+e- to hadrons / Höche, Stefan (Fermilab) ; Krauss, Frank (Durham U., IPPP) ; Meinzinger, Peter (Zurich U.) ; Reichelt, Daniel (CERN)
We present the first next-to-leading order matched and multi-jet merged predictions based on the Alaric parton shower. [...]
arXiv:2507.22837 ; FERMILAB-PUB-25-0479-T ; IPPP-25-49 ; ZU-TH 49/25 ; CERN-TH-2025-141 ; MCNET-25-18. - 17.
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