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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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2024-10-22
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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2024-08-13
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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2024-08-01
06:54
Toponium hunter’s guide / Aguilar-Saavedra, J.A. (Madrid, IFT)
We address the discovery and characterisation of toponium production at the Large Hadron Collider. In the dilepton decay mode, multivariate analyses of spin and colour observables could provide evidence that an excess of events present near the $t \bar t$ threshold corresponds to a spin-zero colour singlet. [...]
arXiv:2407.20330; IFT-UAM/CSIC-24-112; CERN-TH-2024-123.- 2024-09-01 - 10 p. - Published in : Phys. Rev. D 110 (2024) 054032 Fulltext: 2407.20330 - PDF; Publication - PDF;

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2024-07-30
04:22
Absorbing discretization effects with a massive renormalization scheme: The charm-quark mass / Del Debbio, Luigi (Edinburgh U.) ; Erben, Felix (CERN) ; Flynn, Jonathan M. (Southampton U.) ; Mukherjee, Rajnandini (Southampton U.) ; Tsang, J. Tobias (CERN) /RBC Collaboration ; UKQCD Collaboration
We present the first numerical implementation of the massive SMOM (mSMOM) renormalization scheme and use it to calculate the charm quark mass. Based on ensembles with three flavours of dynamical domain wall fermions with lattice spacings in the range 0.11 -- 0.08 fm, we demonstrate that the mass scale which defines the mSMOM scheme can be chosen such that the extrapolation has significantly smaller discretisation effects than the SMOM scheme. [...]
arXiv:2407.18700; CERN-TH-2024-124.- 2024-09-01 - 15 p. - Published in : Phys. Rev. D 110 (2024) 054512 Fulltext: Publication - PDF; 2407.18700 - PDF;

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2024-07-26
04:22
Impact parameter dependence of anisotropic flow: Bayesian reconstruction in ultracentral nucleus-nucleus collisions / Alqahtani, Mubarak (Imam Abdulrahman Bin Faisal U.) ; Bhalerao, Rajeev S. (IISER, Pune) ; Giacalone, Giuliano (CERN ; Heidelberg U.) ; Kirchner, Andreas (Heidelberg U.) ; Ollitrault, Jean-Yves (IPhT, Saclay)
Peculiar phenomena have been observed in analyses of anisotropic flow ($v_n$) fluctuations in ultracentral nucleus-nucleus collisions: The fourth-order cumulant of the elliptic flow ($v_2$) distribution changes sign. In addition, the ATLAS collaboration has shown that cumulants of $v_n$ fluctuations of all orders depend significantly on the centrality estimator. [...]
arXiv:2407.17308; CERN-TH-2024-118.- 2024-12-09 - 18 p. - Published in : Phys. Rev. C 110 (2024) 064906 Fulltext: 2407.17308 - PDF; Publication - PDF;

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2024-07-18
04:27
A Phenomenological Analysis of LHC Neutrino Scattering at NLO Accuracy Matched to Parton Showers / van Beekveld, Melissa (NIKHEF, Amsterdam) ; Ferrario Ravasio, Silvia (CERN) ; Groenendijk, Eva (NIKHEF, Amsterdam) ; Krack, Peter (NIKHEF, Amsterdam ; Vrije U., Amsterdam) ; Rojo, Juan (NIKHEF, Amsterdam ; Vrije U., Amsterdam) ; Sánchez, Valentina Schütze (NIKHEF, Amsterdam)
We perform a detailed phenomenological study of high-energy neutrino deep inelastic scattering (DIS) focused on LHC far-forward experiments such as FASER$\nu$ and SND@LHC. To this aim, we parametrise the neutrino fluxes reaching these LHC far-forward experiments in terms of `neutrino PDFs' encoding their energy and rapidity dependence by means of the LHAPDF framework. [...]
arXiv:2407.09611; Nikhef 2024-012; CERN-TH-2024-111.- 2024-11-18 - 25 p. - Published in : Eur. Phys. J. C 84 (2024) 1175 Fulltext: 2407.09611 - PDF; document - PDF;

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