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TH Preprints

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2024-12-17
04:29
Effective temperatures of the QGP from thermal photon and dilepton production / Massen, Olaf (Utrecht U. ; NIKHEF, Amsterdam) ; Nijs, Govert (CERN) ; Sas, Mike (Utrecht U. ; NIKHEF, Amsterdam ; CERN) ; van der Schee, Wilke (NIKHEF, Amsterdam ; CERN ; Utrecht U.) ; Snellings, Raimond (Utrecht U. ; NIKHEF, Amsterdam)
Thermal electromagnetic radiation is emitted by the quark-gluon plasma (QGP) throughout its space-time evolution, with production rates that depend characteristically on the temperature. [...]
CERN-TH-2024-213 ; arXiv:2412.09671. - 13.
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2024-12-14
04:53
Interpolating amplitudes / Bresó, Víctor (U. Heidelberg, ITP) ; Heinrich, Gudrun (KIT, Karlsruhe, TP) ; Magerya, Vitaly (CERN) ; Olsson, Anton (KIT, Karlsruhe, TP)
While the calculation of scattering amplitudes at higher orders in perturbation theory has reached a high degree of maturity, their usage to produce physical predictions within Monte Carlo programs is often hampered by the slow evaluation of the multi-loop amplitudes, especially so for amplitudes calculated numerically. [...]
CERN-TH-2024-211 ; KA-TP-23-2024 ; P3H-24-092 ; arXiv:2412.09534. - 43.
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2024-12-12
04:54
In Search of an Invisible $Z^\prime$ / Davighi, Joe (CERN)
We consider extending the Standard Model by an anomaly-free and possibly flavour non-universal $U(1)_X$ gauge symmetry, whose breaking gives a $Z^\prime$ boson that does not affect electroweak precision observables at tree-level or at 1-loop. [...]
CERN-TH-2024-212 ; arXiv:2412.07694. - 31.
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2024-12-07
04:40
Finiteness and the Emergence of Dualities / Delgado, Matilda (Garching, Max Planck Inst. ; Harvard U., Phys. Dept.) ; van de Heisteeg, Damian (Harvard U., Phys. Dept.) ; Raman, Sanjay (Harvard U., Phys. Dept.) ; Torres, Ethan (CERN) ; Vafa, Cumrun (Harvard U., Phys. Dept.) ; Xu, Kai (Harvard U., Phys. Dept.)
We argue that the finiteness of quantum gravity (QG) amplitudes in fully compactified theories (at least in supersymmetric cases) leads to a bottom-up prediction for the existence of non-trivial dualities. [...]
MPP-2024-224 ; CERN-TH-2024-204 ; arXiv:2412.03640. - 57.
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2024-12-04
05:14
Quantum corrections to DGKT and the Weak Gravity Conjecture / Montero, Miguel (Madrid, IFT) ; Valenzuela, Irene (Madrid, IFT ; CERN)
We study D4 brane domain walls in the scale-separated 4d $\mathcal{N}$=1 AdS$_4$ DGKT scenario. [...]
IFT-24-155 ; CERN-TH-2024-190 ; arXiv:2412.00189. - 55.
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2024-12-04
05:09
Constraints on the Pre-Big Bang scenario from a cosmological interpretation of the NANOGrav data / Conzinu, P. (INFN, Parma ; U. Parma (main)) ; Fanizza, G. (U. Lisbon (main)) ; Gasperini, M. (INFN, Bari ; U. Bari (main)) ; Pavone, E. (INFN, Bari ; U. Bari (main)) ; Tedesco, L. (INFN, Bari ; U. Bari (main)) ; Veneziano, G. (CERN ; College de France)
We discuss a recently proposed fit of the 15-year data set obtained from the North American Nanohertz Observatory for Gravitational Waves (NANOGrav) in terms of a relic stochastic background of primordial gravitons, produced in the context of the string cosmology pre-big bang scenario. [...]
arXiv:2412.01734 ; CERN-TH-2024-210 ; BA-TH/809-24. - 19.
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2024-12-04
05:05
Extra dimensional axion patterns / de Giorgi, Arturo (Durham U. (main)) ; Ramos, Maria (CERN)
We study for the first time the $\textit{complete}$ parameter space of a bulk extra-dimensional axion. [...]
IPPP/24/75 ; CERN-TH-2024-205 ; arXiv:2412.00179. - 20.
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2024-11-28
04:29
Renormalisation group evolution of the shape function $g_{17}$ in $\bar{B}\to X_s \gamma$ and $\bar{B} \to X_s \ell^+\ell^-$ at subleading power / Bartocci, Riccardo (U. Mainz, PRISMA ; Mainz U., Inst. Phys.) ; Böer, Philipp (CERN) ; Hurth, Tobias (U. Mainz, PRISMA ; Mainz U., Inst. Phys.)
We derive and solve the renormalisation-group (RG) equation of the shape function $g_{17}(\omega,\omega_1;\mu)$, which appears at subleading power in the factorization of the inclusive decays $\bar{B} \to X_s \gamma$ and $\bar B \to X_s \ell^+\ell^-$. [...]
MITP/24-078 ; CERN-TH-2024-191 ; arXiv:2411.16634. - 37.
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2024-11-23
04:25
Bounds on the bubble wall velocity / Ai, Wen-Yuan (King's Coll. London) ; Laurent, Benoit (McGill U., Montreal (main)) ; van de Vis, Jorinde (CERN)
Determining the bubble wall velocity in first-order phase transitions is a challenging task, requiring the solution of (coupled) equations of motion for the scalar field and Boltzmann equations for the particles in the plasma. [...]
CERN-TH-2024-198 ; KCL-PH-TH/2024-57 ; arXiv:2411.13641. - 47.
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2024-11-22
04:22
A generalized picture of colour decoherence in dense QCD media / Abreu, Samuel (CERN ; U. Edinburgh, Higgs Ctr. Theor. Phys.) ; Mayo López, Xoán (Santiago de Compostela U., IGFAE) ; Milhano, Guilherme (LIP, Lisbon ; Lisbon, IST) ; Soto-Ontoso, Alba (Granada U., Theor. Phys. Astrophys.)
We revisit the calculation of the soft gluon emission probability off a colour-singlet $q\bar q$ system that evolves in a quark-gluon plasma. [...]
arXiv:2410.24135 ; CERN-TH-2024-185. - 34.
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