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Towards a determination of the low $x$ gluon via exclusive $J/\psi$ production
/ Flett, C.A. (Liverpool U., Dept. Math.) ; Jones, S.P. (CERN) ; Martin, A.D. (Durham U., IPPP) ; Ryskin, M.G. (Durham U., IPPP ; St. Petersburg, INP) ; Teubner, T. (Liverpool U., Dept. Math.)
We discuss how the stability of the theoretical prediction for exclusive $J/\psi$ photoproduction has been improved through a systematic taming of the known $\overline{\text{MS}}$ coefficient functions by accounting for a formally power suppressed, but numerically significant, correction encoded within a $Q_0$ cut. The phenomenological implications of this will be emphasised meaning, ultimately, the possibility to include the exclusive data into a global fitter framework to provide constraints on the small $x$ gluon..
arXiv:1907.06471; CERN-TH-2019-107; IPPP/19/53; LTH 1209.-
SISSA, 2019-07-03 - 6 p.
- Published in : PoS DIS2019 (2019) 053
Fulltext: PoS(DIS2019)053 - PDF; 1907.06471 - PDF;
In : The XXVII International Workshop on Deep Inelastic Scattering and Related Subjects, Turin, Italy, 8 - 12 Apr 2019, pp.053
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Very low $x$ gluon density determined by LHCb exclusive $J/\psi$ data
/ Flett, C.A. (Liverpool U., Dept. Math.) ; Martin, A.D. (Durham U., IPPP ; St. Petersburg, INP) ; Ryskin, M.G. (Durham U., IPPP ; St. Petersburg, INP) ; Teubner, T. (Liverpool U., Dept. Math.)
The low $x$ behaviour of the gluon density $xg(x,\mu^2)$ at scale $\mu^2=2.4$ GeV$^2$ is determined using exclusive $J/\psi$ production data from HERA and LHCb within the framework of collinear factorisation at next-to-leading order (NLO). It is shown that in the interval $3\times 10^{-6} < x <10^{-3}$ the gluon distribution function grows as $xg(x,\mu^2)\propto x^{-\lambda}$ with $\lambda=0.135\pm 0.006 $. [...]
arXiv:2006.13857; IPPP/20/23; LTH 1237.-
2020-12-11 - 18 p.
- Published in : Phys. Rev. D 102 (2020) 114021
Article from SCOAP3: PDF; Fulltext: PDF;
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3.
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Exclusive production of heavy quarkonia as a probe of the low x and low scale gluon PDF
/ Flett, C.A. (Liverpool U., Dept. Math.) ; Jones, S.P. (CERN) ; Martin, A.D. (Durham U., IPPP) ; Ryskin, M.G. (Durham U., IPPP ; St. Petersburg, INP) ; Teubner, T. (Liverpool U., Dept. Math.)
We discuss the exclusive $J/\psi$ photoproduction process, as measured recently at LHCb, as a means of constraining and ultimately determining the low $x$ and low $Q$ gluon PDF. [...]
arXiv:1912.09128 ; CERN-TH-2019-223 ; IPPP/19/96 ; LTH 1221.
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5 p.
Fulltext
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How to include exclusive $J/\psi$ production data in global PDF analyses
/ Flett, C.A. (Liverpool U., Dept. Math.) ; Jones, S.P. (CERN) ; Martin, A.D. (Durham U., IPPP) ; Ryskin, M.G. (Durham U., IPPP ; St. Petersburg, INP) ; Teubner, T. (Liverpool U., Dept. Math.)
We compare the cross section for exclusive $J/\psi$ photoproduction calculated at NLO in the collinear factorization approach with HERA and LHCb data. Using the optimum scale formalism together with the subtraction of the low $k_t<Q_0$ contribution from the NLO coefficient function to avoid double counting we show that the existing global parton distribution functions (PDFs) are consistent with the data within their uncertainties. [...]
arXiv:1908.08398; CERN-TH-2019-137; IPPP/19/65; LTH 1213.-
2020-05-14 - 9 p.
- Published in : Phys. Rev. D 101 (2020) 094011
Article from SCOAP3: PDF; Fulltext: PDF; Fulltext from Publisher: PDF;
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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. [...]
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.
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46.
Fermilab Library Server - Fulltext - Fulltext
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7.
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N$^{3}$LO corrections to jet production in deep inelastic scattering using the Projection-to-Born method
/ Currie, J. (Durham U., IPPP) ; Gehrmann, T. (Zurich U.) ; Glover, E.W.N. (Durham U., IPPP) ; Huss, A. (CERN) ; Niehues, J. (Durham U., IPPP) ; Vogt, A. (Liverpool U., Dept. Math.)
Computations of higher-order QCD corrections for processes with exclusive final states require a subtraction method for real-radiation contributions. We present the first-ever generalisation of a subtraction method for third-order (N3LO) QCD corrections. [...]
arXiv:1803.09973; CERN-TH-2018-056; IPPP/18/21; ZU-TH 12/18; LTH 1155; IPPP-18-21; ZU-TH-12-18; LTH-1155.-
2018-05-31 - 19 p.
- Published in : JHEP 05 (2018) 209
Article from SCOAP3: scoap3-fulltext - PDF; scoap - PDF; Fulltext: PDF;
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8.
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String Model Building on Quantum Annealers
/ Abel, Steven A. (CERN ; Durham U., IPPP ; Durham U.) ; Nutricati, Luca A. (Durham U., IPPP ; Durham U.) ; Rizos, John (Ioannina U.)
We explore for the first time the direct construction of string models on quantum annealers, and investigate their efficiency and effectiveness in the model discovery process. Through a thorough comparison with traditional methods such as simulated annealing, random scans, and genetic algorithms, we highlight the potential advantages offered by quantum annealers, which in this study promised to be roughly fifty times faster than random scans and genetic algorithm and approximately four times faster than simulated annealing..
arXiv:2306.16801.-
2023-12-01 - 8 p.
- Published in : Fortschr. Phys. 71 (2023) 2300167
Fulltext: document - PDF; 2306.16801 - PDF;
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