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1.
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Precise Predictions for Event Shapes in Diphoton Production at the LHC
/ Buccioni, Federico (Munich, Tech. U.) ; Chen, Xuan (Shandong U.) ; Feng, Wei-Jie (Zurich U.) ; Gehrmann, Thomas (Zurich U.) ; Huss, Alexander (CERN) ; Marcoli, Matteo (Durham U., IPPP)
Photon pair production is an important benchmark process at the LHC, entering Higgs boson studies and new physics searches. It has been measured to high accuracy, allowing for detailed studies of event shapes in diphoton final states. [...]
arXiv:2501.14021; CERN-TH-2025-018; IPPP/25/03; TUM-HEP-1553/25; ZU-TH 05/25.-
2025-04-28 - 6 p.
- Published in : Phys. Rev. Lett. 134 (2025) 171901
Fulltext: 2501.14021 - PDF; publication - PDF;
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2.
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Precise Determination of the Strong Coupling Constant from Dijet Cross Sections up to the Multi-TeV Range
/ Ahmadova, Fazila (Garching, Max Planck Inst. ; U. Zurich (main)) ; Britzger, Daniel (Garching, Max Planck Inst.) ; Chen, Xuan (Shandong U.) ; Gäßler, Johannes (KIT, Karlsruhe, ETP) ; Gehrmann-De Ridder, Aude (U. Zurich (main) ; Zurich, ETH) ; Gehrmann, Thomas (U. Zurich (main)) ; Glover, Nigel (U. Zurich (main) ; Durham U., IPPP) ; Gwenlan, Claire (Oxford U.) ; Heinrich, Gudrun (KIT, Karlsruhe, TP) ; Huss, Alexander (CERN) et al.
We determine the value of the strong coupling $\alpha_\text{s}$ and study its running over a wide range of scales as probed by the dijet production process at hadron colliders, based on an NNLO QCD analysis of LHC dijet data. From a large subset of these data a value of $\alpha_\text{s} (m_\text{Z}) = 0.1178 \pm 0.0022$ is obtained for the strong coupling at the scale of the Z-boson mass $m_\text{Z}$, using the invariant mass of the dijet system to select the scale where $\alpha_\text{s}$ is probed. [...]
arXiv:2412.21165; CERN-TH-2024-224; KA-TP-25-2024; MPP-2024-260; ZU-TH/01/25.-
2025-07-17 - 12 p.
- Published in : Phys. Rev. Lett. 135 (2025) 031903
Fulltext: 2412.21165 - PDF; document - PDF;
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3.
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NNLO Photon Production with Realistic Photon Isolation
/ Schuermann, Robin (Zurich U.) ; Chen, Xuan (Karlsruhe U., ITP ; KIT, Karlsruhe, IAP) ; Gehrmann, Thomas (Zurich U.) ; Glover, E.W.N. (Durham U., IPPP) ; Höfer, Marius (Munich U., ASC) ; Huss, Alexander (CERN)
Isolated photon production at hadron colliders proceeds via direct production and fragmentation processes. Theory predictions for the isolated photon and photon-plus-jet cross section often impose idealised photon isolation criteria, eliminating the fragmentation contribution and introducing a systematic uncertainty in the comparison to data. [...]
arXiv:2208.02669.-
2022-10-20 - 11 p.
- Published in : PoS LL2022 (2022) 034
Fulltext: Publication - PDF; 2208.02669 - PDF;
In : 16th DESY Workshop on Elementary Particle Physics: Loops and Legs in Quantum Field Theory 2022, Ettal, Germany, 25 - 30 Apr 2022, pp.034
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4.
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Differential N$^3$LO QCD corrections to charged current production at the LHC
/ Chen, Xuan (KIT, Karlsruhe) ; Gehrmann, Thomas (Zurich U.) ; Glover, Nigel (Durham U., IPPP) ; Huss, Alexander (CERN) ; Yang, Tong-Zhi (Zurich U.) ; Zhu, Hua Xing (Zhejiang U., Inst. Mod. Phys.)
Charged current Drell-Yan production at hadron colliders is a benchmark electroweak process. A recent measurement of the W boson mass by the CDF experiment displays a large deviation from the Standard Model prediction. [...]
arXiv:2207.08584.-
2022-10-20 - 11 p.
- Published in : PoS LL2022 (2022) 004
Fulltext: document - PDF; 2207.08584 - PDF;
In : 16th DESY Workshop on Elementary Particle Physics: Loops and Legs in Quantum Field Theory 2022, Ettal, Germany, 25 - 30 Apr 2022, pp.004
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5.
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Theory uncertainties in the fiducial Drell-Yan cross section and distributions
/ Chen, Xuan (KIT, Karlsruhe, TP ; KIT, Karlsruhe, IAP) ; Gehrmann, Thomas (Zurich U.) ; Glover, Nigel (Durham U., IPPP) ; Huss, Alexander (CERN) ; Monni, Pier Francesco (CERN) ; Re, Emanuele (Milan Bicocca U. ; INFN, Milan Bicocca ; Annecy, LAPTH) ; Rottoli, Luca (Zurich U.) ; Torrielli, Paolo (INFN, Turin ; Turin U.)
In these proceedings we study various sources of theoretical uncertainty in the Drell-Yan $p_T^{{\ell\ell}}$ spectrum focussing on the $p_T^{{\ell\ell}} \lesssim 100\, {\rm GeV}$ region. [...]
arXiv:2206.11059.
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6 p.
Fulltext
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6.
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Transverse Mass Distribution and Charge Asymmetry in W Boson Production to Third Order in QCD
/ Chen, Xuan (KIT, Karlsruhe, TP ; KIT, Karlsruhe, IKP) ; Gehrmann, Thomas (Zurich U.) ; Glover, Nigel (Durham U., IPPP) ; Huss, Alexander (CERN) ; Yang, Tong-Zhi (Zurich U.) ; Zhu, Hua Xing (Zhejiang U., Inst. Mod. Phys.)
Charged gauge boson production at hadron colliders is a fundamental benchmark for the extraction of electroweak parameters and the understanding of the proton structure. To enable precision phenomenology for this process, we compute the third-order (N$^3$LO) QCD corrections to the rapidity distribution and charge asymmetry in W boson production and to the transverse mass distribution of its decay products. [...]
arXiv:2205.11426; IPPP/22/32; ZU-TH 19/22; P3H-22-055; KA-TP-15-2022; CERN-TH-2022-083.-
2023-03-28 - 6 p.
- Published in : Phys. Lett. B 840 (2023) 137876
Fulltext: 2205.11426 - PDF; Publication - PDF;
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7.
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Automation of antenna subtraction in colour space: gluonic processes
/ Chen, Xuan (KIT, Karlsruhe ; KIT, Karlsruhe, IKP) ; Gehrmann, Thomas (Zurich U.) ; Glover, E.W. N. (Durham U., IPPP) ; Huss, Alexander (CERN) ; Marcoli, Matteo (Zurich U.)
We present the colourful antenna subtraction method, a reformulation of the antenna subtraction scheme for next-to-next-to-leading order (NNLO) calculations in QCD. The aim of this new approach is to achieve a general and process-independent construction of the subtraction infrastructure at NNLO. [...]
arXiv:2203.13531; CERN-TH-2022-047; IPPP/22/15; KA-TP-05-2022; P3H-22-030; ZU-TH 10/22.-
2022-10-14 - 55 p.
- Published in : JHEP 2210 (2022) 099
Fulltext: document - PDF; 2203.13531 - PDF;
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8.
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Third-Order Fiducial Predictions for Drell-Yan Production at the LHC
/ Chen, Xuan (KIT, Karlsruhe ; KIT, Karlsruhe, IKP) ; Gehrmann, Thomas (Zurich U.) ; Glover, E.W.N. (Durham U., IPPP) ; Huss, Alexander (CERN) ; Monni, Pier Francesco (CERN) ; Re, Emanuele (INFN, Milan Bicocca ; Milan Bicocca U. ; Annecy, LAPTH) ; Rottoli, Luca (Zurich U.) ; Torrielli, Paolo (Turin U. ; INFN, Turin)
The Drell-Yan process at hadron colliders is a fundamental benchmark for the study of strong interactions and the extraction of electro-weak parameters. The outstanding precision of the LHC demands very accurate theoretical predictions with a full account of fiducial experimental cuts. [...]
arXiv:2203.01565; CERN-TH-2022-023; IPPP/22/08; LAPTH-009/22; KA-TP-03-2022,
P3H-22-022; ZU-TH 07/22.-
2022-06-21 - 9 p.
- Published in : Phys. Rev. Lett. 128 (2022) 252001
Fulltext: 2203.01565 - PDF; PhysRevLett.128.252001 - PDF;
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9.
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Dilepton Rapidity Distribution in Drell-Yan Production to Third Order in QCD
/ Chen, Xuan (Zurich U. ; KIT, Karlsruhe, IAP ; KIT, Karlsruhe, TP) ; Gehrmann, Thomas (Zurich U.) ; Glover, Nigel (Durham U., IPPP) ; Huss, Alexander (CERN) ; Yang, Tong-Zhi (Zurich U.) ; Zhu, Hua Xing (Zhejiang U., Inst. Mod. Phys.)
We compute for the first time the lepton-pair rapidity distribution in the photon-mediated Drell-Yan process to next-to-next-to-next-to-leading order (N$^3$LO) in QCD. The calculation is based on the qT-subtraction method, suitably extended to this order for quark-antiquark initiated Born processes. [...]
arXiv:2107.09085; KA-TP-17-2021; ZU-TH 33/21; CERN-TH-2021-110; IPPP/21/13.-
2022-02-03 - 7 p.
- Published in : Phys. Rev. Lett. 128 (2022) 052001
Fulltext: Fulltext - PDF; 2107.09085 - PDF;
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