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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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2.
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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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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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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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Fermilab Library Server - Fulltext - Fulltext
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A new approach to modelling elastic and inelastic photon-initiated production at the LHC: SuperChic 4
/ Harland-Lang, L.A. (Oxford U., Theor. Phys.) ; Tasevsky, M. (Prague, Inst. Phys.) ; Khoze, V.A. (Durham U., IPPP ; St. Petersburg, INP) ; Ryskin, M.G. (St. Petersburg, INP)
We present the results of the new SuperChic 4 Monte Carlo implementation of photon-initiated production in proton-proton collisions, considering as a first example the case of lepton pair production. This is based on the structure function calculation of the underlying process, and focusses on a complete account of the various contributing channels, including the case where a rapidity gap veto is imposed. [...]
arXiv:2007.12704; IPPP/20/33.-
2020-10-07 - 19 p.
- Published in : Eur. Phys. J. C 80 (2020) 925
Article from SCOAP3: PDF; Fulltext: PDF;
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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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Workshop on CP Studies and Non-Standard Higgs Physics
1st Workshop on CP Studies and Non-standard Higgs Physics - 2nd Workshop on CP Studies and Non-standard Higgs Physics 3rd Workshop on CP Studies and Non-standard Higgs Physics 4th Workshop on CP Studies and Non-standard Higgs Physics CPNSH Workshop on CP Studies and Non-standard Higgs Physics : May 2004 - Dec 2005 CP Studies and Non-Standard Higgs Physics Workshop on CP Studies and Non-Standard Higgs Physics : CERN, Geneva, Switzerland 14 - 15 May 2004
14 - 15 May 2004
- CERN, Geneva, Switzerland
/ Accomando, E. (Turin U.); Akeroyd, A.G. (KEK, Tsukuba); Akhmetzyanova, E. (Samara State U.); Albert, J. (Caltech, Kellogg Lab); Alves, A. (Sao Paulo U.); Amapane, N. (Turin U.); Aoki, M. (KEK, Tsukuba); Azuelos, G. (Montreal U. ; TRIUMF); Baffioni, S. (Ecole Polytechnique); Ballestrero, A. (Turin U.) et al.
There are many possibilities for new physics beyond the Standard Model that feature non-standard Higgs sectors. These may introduce new sources of CP violation, and there may be mixing between multiple Higgs bosons or other new scalar bosons. [...]
Geneva : CERN, 2006 - 542 p.
hep-ph/0608079 .- CERN-2006-009 .- CERN-2006-009 .- CERN-2006-009
e-proceedings
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