CERN Accelerating science

CERN Theory

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2023-02-07
07:48
Dark Sector Showers in the Lund Jet Plane / Cohen, Timothy (CERN ; EPFL, Lausanne, LPTP ; Oregon U.) ; Roloff, Jennifer (Brookhaven) ; Scherb, Christiane (LBL, Berkeley ; UC, Berkeley (main))
We investigate the consequences of models where dark sector quarks could be produced at the LHC, which subsequently undergo a dark parton shower, generating jets of dark hadrons that ultimately decay back to Standard Model hadrons. [...]
arXiv:2301.07732 ; CERN-TH-2023-007.
- 11 p.
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2023-02-07
04:30
On interplay between flavour anomalies and neutrino properties / Freitas, Felipe F. (Aveiro U.) ; Gonçalves, João (Aveiro U.) ; Morais, António P. (Aveiro U.) ; Pasechnik, Roman (Lund U., Dept. Theor. Phys. ; Lund U.) ; Porod, Werner (Wurzburg U.)
A minimal extension of the Standard Model (SM) featuring two scalar leptoquarks, an SU(2) doublet with hypercharge 1/6 and a singlet with hypercharge 1/3, is proposed as an economical benchmark model for studies of an interplay between flavour physics and properties of the neutrino sector. [...]
arXiv:2206.01674 ; CERN-TH-2022-208.
- 14 p.
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2023-02-03
04:40
Massive three-loop form factors: anomaly contribution / Fael, Matteo (CERN) ; Lange, Fabian (KIT, Karlsruhe, TTP ; KIT, Karlsruhe, IAP) ; Schönwald, Kay (Zurich U.) ; Steinhauser, Matthias (KIT, Karlsruhe, TTP)
We compute three-loop corrections to the singlet form factors for massive quarks using a semi-analytic method which provides precise results over the whole kinematic range. [...]
arXiv:2302.00693 ; CERN-TH-2023-012 ; P3H-23-006 ; TTP23-002 ; ZU-TH 05/23.
- 38 p.
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2023-02-03
04:39
STE-QUEST: Space Time Explorer and QUantum Equivalence principle Space Test / Ahlers, Holger ; Badurina, Leonardo ; Bassi, Angelo ; Battelier, Baptiste ; Beaufils, Quentin ; Bongs, Kai ; Bouyer, Philippe ; Braxmaier, Claus ; Buchmueller, Oliver ; Carlesso, Matteo et al.
An M-class mission proposal in response to the 2021 call in ESA's science programme with a broad range of objectives in fundamental physics, which include testing the Equivalence Principle and Lorentz Invariance, searching for Ultralight Dark Matter and probing Quantum Mechanics..
arXiv:2211.15412 ; CERN-TH-2022-202.
- 78 p.
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2023-02-03
04:38
Gravitoelectromagnetic quadrirefringence and the binaries rainbow / Romano, Antonio Enea (King's Coll. London ; CERN ; ICRA, Pescara) ; Vallejo-Peña, Sergio A. (ICRA, Pescara)
The interaction between gravitational waves (GW) and electromagnetic waves (EMW) produces quadrirefringence, a phenomenon consisting in a frequency and polarization dependency of the speed of GW and EMW. [...]
CERN-TH-2023-013 ; arXiv:2301.11304.
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2023-02-03
04:36
A unified effective approach to cosmological perturbations / Romano, Antonio Enea (ICRA, Pescara ; CERN)
A unified model independent effective description of cosmological perturbations is derived in terms of two effective quantities, playing the role of effective propagation speeds of curvature perturbations and gravitational waves, encoding the effects of the interaction of perturbations at any order, and inducing a modification of the friction term of the perturbations propagation equation. [...]
arXiv:2301.05679 ; CERN-TH-2023-006.
- 24 p, 24 p.
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2023-02-02
04:22
Prospects for Future Binary Black Hole GW Studies in Light of PTA Measurements / Ellis, John ; Fairbairn, Malcolm ; Hütsi, Gert ; Raidal, Martti ; Urrutia, Juan ; Vaskonen, Ville ; Veermäe, Hardi
NANOGrav and other Pulsar Timing Arrays (PTAs) have discovered a common-spectrum process in the nHz range that may be due to gravitational waves (GWs): if so, they are likely to have been generated by black hole (BH) binaries with total masses $> 10^9 M_{\odot}$. [...]
KCL-PH-TH/2023-04 ; CERN-TH-2023-008 ; AION-REPORT/2023-1 ; arXiv:2301.13854.
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2023-01-27
08:40
Modeling HI at the field level / Obuljen, Andrej (Zurich U.) ; Simonović, Marko (CERN) ; Schneider, Aurel (Zurich U.) ; Feldmann, Robert (Zurich U.)
We use an analytical forward model based on perturbation theory to predict the neutral hydrogen (HI) overdensity maps at low redshifts. [...]
arXiv:2207.12398 ; CERN-TH-2022-127.
- 23 p.
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2023-01-27
08:14
Azimuthal di-jet correlations with parton branching TMD distributions / Bermudez Martinez, A. (DESY) ; Hautmann, F. (CERN ; Antwerp U. ; U. Oxford (main))
The parton branching formulation of TMD evolution has recently been used to make predictions for jet observables at the Large Hadron Collider (LHC), including perturbative matching at next-to-leading order (NLO). [...]
arXiv:2208.08446 ; CERN-TH-2022-137 ; DESY-22-135.
- 7 p.
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2023-01-26
09:09
A quantum analytical Adam descent through parameter shift rule using Qibo / Carrazza, Stefano (Milan U. ; CERN ; Technol. Innovation Inst., UAE) ; Robbiati, Matteo (Milan U. ; CERN) ; Efthymiou, Stavros (Technol. Innovation Inst., UAE) ; Pasquale, Andrea (Milan U. ; Technol. Innovation Inst., UAE)
In this proceedings we present quantum machine learning optimization experiments using stochastic gradient descent with the parameter shift rule algorithm. We first describe the gradient evaluation algorithm and its optimization procedure implemented using the Qibo framework. [...]
arXiv:2210.10787; CERN-TH-2022-168; TIF-UNIMI-2022-20.- 2022-11-13 - 6 p. - Published in : PoS: ICHEP2022 (2022) , pp. 206
Fulltext: 2210.10787 - PDF; document - PDF;
In : 41st International Conference on High Energy Physics (ICHEP 2022), Bologna, Italy, 6 - 13 Jul 2022, pp.206

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