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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
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Updated predictions for toponium production at the LHC
/ Garzelli, M.V. (King's Coll. London ; CERN ; Hamburg U., Inst. Theor. Phys. II) ; Limatola, G. (Hamburg U., Inst. Theor. Phys. II ; DESY) ; Moch, S.-O. (Hamburg U., Inst. Theor. Phys. II) ; Steinhauser, M. (KIT, Karlsruhe, TTP) ; Zenaiev, O. (Hamburg U., Inst. Theor. Phys. II)
We provide an update on QCD predictions for top-quark pair production close to threshold including bound state effects at the Large Hadron Collider. [...]
CERN-TH-2024-222 ; DESY 24-207 ; P3H-24-104 ; TTP24-048 ; arXiv:2412.16685.
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Probing the strange content of the proton with charm production in charged current at LHeC
/ Abdolmaleki, Hamed (Semnan U.) ; Bertone, Valerio (INFN, Pavia ; Pavia U.) ; Britzger, Daniel (Munich, Max Planck Inst.) ; Camarda, Stefano (CERN) ; Cooper-Sarkar, Amanda (Oxford U.) ; Geiser, Achim (DESY) ; Giuli, Francesco (INFN, Rome2 ; Rome U., Tor Vergata) ; Glazov, Alexander (DESY) ; Luszczak, Agnieszka (Cracow Tech. U.) ; Novikov, Ivan (Dubna, JINR) et al.
/xFitter Developers' Team
We study charm production in charged-current deep-inelastic scattering (DIS) using the xFitter framework. Recent results from the LHC have focused renewed attention on the determination of the strange-quark parton distribution function (PDF) and the DIS charm process provides important complementary constraints on this quantity. [...]
arXiv:1907.01014; DESY-19-107.-
2019-10-22 - 19 p.
- Published in : Eur. Phys. J. C 79 (2019) 864
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Status of QCD precision predictions for Drell-Yan processes
/ Alekhin, S. (Hamburg U., Inst. Theor. Phys. II) ; Amoroso, S. (DESY) ; Buonocore, L. (CERN) ; Huss, A. (CERN) ; Kallweit, S. (Zurich U.) ; Kardos, A. (U. Debrecen, Inst. Phys. ; MTA-DE, Debrecen ; Eotvos U.) ; Michel, J. (Amsterdam U. ; NIKHEF, Amsterdam) ; Moch, S. (Hamburg U., Inst. Theor. Phys. II) ; Petriello, F. (Northwestern U. ; Argonne) ; Rottoli, L. (Zurich U.) et al.
We compute differential distributions for Drell-Yan processes at the LHC and the Tevatron colliders at next-to-next-to-leading order in perturbative QCD, including fiducial cuts on the decay leptons in the final state. [...]
arXiv:2405.19714 ; DESY 24-073 ; CERN-TH-2024-068 ; ZU-TH 26/24 ; MPP-2024-106.
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31 p.
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Impact of the heavy quark matching scales in PDF fits
/ xFitter Developers Team Collaboration
We investigate the impact of displaced heavy quark matching scales in a global fit. The heavy quark matching scale $\mu_{m}$ determines at which energy scale $\mu$ the QCD theory transitions from $N_{F}$ to $N_{F}+1$ in the Variable Flavor Number Scheme (VFNS) for the evolution of the Parton Distribution Functions (PDFs) and strong coupling $\alpha_S(\mu)$. [...]
arXiv:1707.05343; DESY-17-101.-
2017-12-07 - 18 p.
- Published in : Eur. Phys. J. C 77 (2017) 837
Article from SCOAP3: scoap3-fulltext - PDF; scoap - PDF; Fulltext: PDF;
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PDF Profiling Using the Forward-Backward Asymmetry in Neutral Current Drell-Yan Production
/ Accomando, Elena (Southampton U. ; Rutherford) ; Fiaschi, Juri (Munster U., ITP ; Southampton U. ; Rutherford) ; Hautmann, Francesco (Rutherford ; Antwerp U. ; Oxford U., Theor. Phys. ; U. Basque Country, Leioa ; CERN) ; Moretti, Stefano (Southampton U. ; Rutherford) ; Bertone, Valerio (Pavia U.) ; Giuli, Francesco (Rome U., Tor Vergata ; INFN, Rome2) ; Abdolmaleki, Hamen (Semnan U.) ; Luszczak, Agnieszka (Cracow Tech. U.) ; Glazov, Alexander (DESY) ; Olness, Fred (Southern Methodist U.) et al.
/xFitter Developers' team
Non-perturbative QCD effects from Parton Distribution Functions (PDFs) may be constrained by using high-statistics Large Hadron Collider (LHC) data. Drell-Yan (DY) measurements in the Charged Current (CC) case provide one of the primary means to do this, in the form of the lepton charge asymmetry. [...]
arXiv:1907.07727; DESY-19-127; MS-TP-19-19; CERN-TH-2019-110.-
2019-10-15 - 21 p.
- Published in : JHEP 1910 (2019) 176
Article from SCOAP3: scoap3-fulltext - PDF; scoap - PDF; Fulltext: PDF;
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ALP-ine quests at the LHC: hunting axion-like particles via peaks and dips in $t \bar{t}$ production
/ Anuar, Afiq (CERN) ; Biekötter, Anke (Mainz U., Inst. Phys. ; U. Mainz, PRISMA) ; Biekötter, Thomas (KIT, Karlsruhe, TP) ; Grohsjean, Alexander (Hamburg U.) ; Heinemeyer, Sven (Madrid, IFT) ; Jeppe, Laurids (DESY) ; Schwanenberger, Christian (Hamburg U. ; DESY) ; Weiglein, Georg (DESY ; Hamburg U., Inst. Theor. Phys. II)
We present an analysis of the sensitivity of current and future LHC searches for new spin-0 particles in top-anti-top-quark ($t\bar{t}$) final states, focusing on generic axion-like particles (ALPs) that are coupled to top quarks and gluons. [...]
arXiv:2404.19014 ; DESY-24-059 ; IFT-UAM/CSIC-24-042 ; KA-TP-06-2024 ; MITP-24-044.
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35 p.
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