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2025-01-01
04:33
Top-quark pole mass extraction at NNLO accuracy / Alekhin, Sergey (Hamburg U., Inst. Theor. Phys. II) ; Garzelli, Maria Vittoria (Hamburg U., Inst. Theor. Phys. II ; CERN) ; Mazzitelli, Javier (PSI, Villigen) ; Moch, Sven-Olaf (Hamburg U., Inst. Theor. Phys. II) ; Zenaiev, Oleksandr (Hamburg U., Inst. Theor. Phys. II)
We describe our recent NNLO QCD extraction of the top-quark pole mass from fits to experimental data on total inclusive and normalized (multi)-differential cross sections for $t\bar{t} + X$ hadroproduction, using as input various modern PDF + $\alpha_s(M_Z)$ sets. We find top-quark mass values compatible among each other and with the PDG 2024 preferred value..
arXiv:2412.20259; CERN-TH-2024-225.- 2024-12-31 - 6 p. - Published in : 10.22323/1.478.0320 Fulltext: 2412.20259 - PDF; document - PDF;
In : 12th Edition of the Large Hadron Collider Physics Conference, Boston, United States, 3 - 7 Jun 2024, pp.

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2024-12-21
04:16
NNLO fits of top-quark mass using total, single-differential and double-differential $t\bar{t}+X$ cross-section data / Alekhin, S. (Hamburg U., Inst. Theor. Phys. II) ; Garzelli, M.V. (Hamburg U., Inst. Theor. Phys. II ; CERN ; Cagliari U.) ; Mazzitelli, J. (PSI, Villigen) ; Moch, S.-O. (Hamburg U., Inst. Theor. Phys. II) ; Zenaiev, O. (Hamburg U., Inst. Theor. Phys. II)
We describe the fits of the top-quark mass value at NNLO using as input the double-differential distributions in rapidity and invariant mass of $t\bar{t}$ pairs obtained by the ATLAS and CMS collaborations from unfolding of their experimental data to the parton level, compared to NNLO theory predictions. We consider different state-of-the-art PDF sets, finding results of the fits compatible among each other within uncertainties. [...]
arXiv:2412.14348; CERN-TH-2024-220.- 2024-12-18 - 4 p. - Published in : PoS: ICHEP2024 (2024) , pp. 393 Fulltext: PDF;

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2024-11-01
04:13
Event generation with Sherpa 3 / Sherpa Collaboration
Sherpa is a general-purpose Monte Carlo event generator for the simulation of particle collisions in high-energy collider experiments. We summarise new developments, essential features, and ongoing improvements within the Sherpa 3 release series. [...]
arXiv:2410.22148; IPPP/24/67; LTH-1385; FERMILAB-PUB-24-0748-T; ZU-TH 51/24, CERN-TH-2024-171; ZU-TH 51/24; MCNET-24-17; CERN-TH-2024-171.- 2024-12-20 - 46 p. - Published in : JHEP 2412 (2024) 156 Fulltext: 2410.22148 - PDF; ab734587330dddd7c27e53d99cd0646e - PDF; Fulltext from Publisher: PDF; External link: Fermilab Library Server

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2024-10-22
04:21
How large could CP violation in neutral $B$ meson mixing be? Implications for baryogenesis and upcoming searches / Miró, Carlos (Valencia U.) ; Escudero, Miguel (CERN) ; Nebot, Miguel (Valencia U.)
CP violation in neutral $B$ meson oscillations is an experimental observable that could be directly related to the baryon asymmetry of the Universe through the $B$-Mesogenesis mechanism. As this phenomenon is highly suppressed in the Standard Model, it could also be a sensitive probe for many new physics scenarios that modify neutral meson mixing. [...]
arXiv:2410.13936; CERN-TH-2024-172.- 2024-12-01 - 28 p. - Published in : Phys. Rev. D 110 (2024) 115033 Fulltext: PDF;

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2024-09-14
04:38
Two-loop amplitudes for $\mathcal{O}(\alpha_s^2)$ corrections to $W\gamma\gamma$ production at the LHC / Badger, Simon (INFN, Turin) ; Hartanto, Heribertus Bayu (APCTP, Pohang ; POSTECH) ; Wu, Zihao (HIAS, UCAS, Hangzhou) ; Zhang, Yang (Hefei, CUST ; PCFT, Hefei) ; Zoia, Simone (CERN)
We present the two-loop helicity amplitudes contributing to the next-to-next-to-leading order QCD predictions for W-boson production in association with two photons at the Large Hadron Collider. We derived compact analytic expressions for the two-loop amplitudes in the leading colour limit, and provide numerical results for the subleading colour contributions. [...]
arXiv:2409.08146; CERN-TH-2024-146; USTC-ICTS/PCFT-24-29.- 2024-12-30 - 31 p. - Published in : JHEP 2512 (2025) 221 Fulltext: 2409.08146 - PDF; document - PDF;

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2024-08-28
04:54
Gravitational Waves from High Temperature Strings / Frey, Andrew R. (Winnipeg U.) ; Mahanta, Ratul (Winnipeg U.) ; Maharana, Anshuman (Harish-Chandra Res. Inst.) ; Quevedo, Fernando (Cambridge U., DAMTP ; CERN ; New York U., Abu Dhabi) ; Villa, Gonzalo (Cambridge U., DAMTP)
We study finite temperature effects in string cosmology and their potential gravitational wave signature. Expanding on our recent work arXiv:2310.11494 , we consider a general configuration of highly excited open and closed strings at high enough temperature to be in the Hagedorn phase in 3+1 dimensions, in order to explore its cosmological implications. [...]
arXiv:2408.13803; CERN-TH-2024-108.- 2024-12-23 - 43 p. - Published in : JHEP 2412 (2024) 174 Fulltext: 2408.13803 - PDF; document - PDF;

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2024-08-13
05:27
Two-Loop Five-Point Two-Mass Planar Integrals and Double Lagrangian Insertions in a Wilson Loop / Abreu, Samuel (CERN ; U. Edinburgh, Higgs Ctr. Theor. Phys.) ; Chicherin, Dmitry (Annecy, LAPTH) ; Sotnikov, Vasily (Zurich U.) ; Zoia, Simone (CERN)
We consider the complete set of planar two-loop five-point Feynman integrals with two off-shell external legs. These integrals are relevant, for instance, for the calculation of the second-order QCD corrections to the production of two heavy vector bosons in association with a jet or a photon at a hadron collider. [...]
arXiv:2408.05201; CERN-TH-2024-136; LAPTH-043/24; ZU-TH 40/24.- 2024-10-23 - 39 p. - Published in : JHEP 2024 (2020) 167 Fulltext: document - PDF; 2408.05201 - PDF;

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2024-08-08
05:10
Overview of $B \to K^{(*)}\ell \ell$ Theoretical Calculations and Uncertainties / Mahmoudi, Farvah (IP2I, Lyon ; CERN ; IUF, Paris) ; Monceaux, Yann (IP2I, Lyon)
The search for New Physics (NP) beyond the Standard Model (SM) has been a central focus of particle physics, including in the context of $B$-meson decays involving $b \to s \ell \ell$ transitions. These transitions, mediated by flavour-changing neutral currents, are highly sensitive to small NP effects due to their suppression in the SM. [...]
arXiv:2408.03235; CERN-TH-2024-119.- 2024-08-07 - 23 p. - Published in : Symmetry: 16 (2024) , no. 8, pp. 1006 Fulltext: 2408.03235 - PDF; document - PDF; Publication - PDF;

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2024-08-03
06:45
Four-loop two-mass tadpoles and the $\rho$ parameter / Abreu, Samuel (CERN ; U. Edinburgh, Higgs Ctr. Theor. Phys.) ; Behring, Arnd (CERN) ; McLeod, Andrew J. (CERN ; U. Edinburgh, Higgs Ctr. Theor. Phys.) ; Page, Ben (CERN ; Gent U.)
We calculate four-loop QCD corrections to the electroweak $\rho$ parameter with a non-vanishing $b$ quark mass. At three loops, it was observed that elliptic integrals contribute to this observable. [...]
arXiv:2407.21700; CERN-TH-2024-129.- 2024-09-17 - 12 p.
- Published in : PoS: LL2024 (2024) , pp. 008 Fulltext: 2407.21700 - PDF; document - PDF;
In : 17th Loops and Legs in Quantum Field Theory (LL 2024), Wittenberg, Germany, 14 - 19 Apr 2024, pp.008

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2024-08-01
07:13
Multiscalar Critical Models with Localised Cubic Interactions / Harribey, Sabine (Nordita ; Stockholm U. (main) ; Royal Inst. Tech., Stockholm) ; Pannell, William H. (King's Coll. London, Dept. Math) ; Stergiou, Andreas (King's Coll. London, Dept. Math ; CERN)
Interface localised interactions are studied for multiscalar universality classes accessible with the perturbative $\varepsilon$ expansion in $4-\varepsilon$ dimensions. The associated beta functions at one loop and partially at two loops are derived, and a wide variety of interface conformal field theories (CFTs) is found, even in cases where the bulk universality class is free or as simple as the Wilson-Fisher description of the $O(N)$ model. [...]
arXiv:2407.20326; CERN-TH-2024-122; CERN-TH-2024-122.- 2024-12-12 - 33 p. - Published in : JHEP 2412 (2024) 092 Fulltext: 2407.20326 - PDF; document - PDF;

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