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002683217 005__ 20230314182125.0
002683217 0248_ $$aoai:cds.cern.ch:2683217$$pcerncds:CERN$$pcerncds:CERN:FULLTEXT$$pcerncds:FULLTEXT
002683217 0247_ $$2DOI$$9bibmatch$$a10.22323/1.352.0053
002683217 037__ $$9arXiv$$aarXiv:1907.06471$$chep-ph
002683217 037__ $$9arXiv:reportnumber$$aCERN-TH-2019-107
002683217 037__ $$9arXiv:reportnumber$$aIPPP/19/53
002683217 037__ $$9arXiv:reportnumber$$aLTH 1209
002683217 035__ $$9arXiv$$aoai:arXiv.org:1907.06471
002683217 035__ $$9Inspire$$aoai:inspirehep.net:1744253$$d2023-03-06T17:26:44Z$$h2023-03-14T15:04:52Z$$mmarcxml$$ttrue$$uhttps://inspirehep.net/api/oai2d
002683217 035__ $$9Inspire$$a1744253
002683217 041__ $$aeng
002683217 100__ $$aFlett, [email protected]$$uLiverpool U., Dept. Math.$$vDepartment of Mathematical Sciences, University of Liverpool, L69 3BX Liverpool, U.K
002683217 245__ $$9arXiv$$aTowards a determination of the low $x$ gluon via exclusive $J/\psi$ production
002683217 269__ $$c2019-07-15
002683217 260__ $$bSISSA$$c2019-07-03
002683217 300__ $$a6 p
002683217 500__ $$9arXiv$$a5 pages, 5 figures. Proceedings of the XXVII International Workshop on Deep-Inelastic Scattering and Related Subjects (DIS2019), submitted to PoS
002683217 520__ $$9SISSA$$aWe discuss how the stability of the theoretical prediction for exclusive $J/\psi$ photoproduction has been improved through a systematic taming of the known $\overline{\text{MS}}$ coefficient functions by accounting for a formally power suppressed, but numerically significant, correctionencoded within a $Q_0$ cut. The phenomenological implications of this will be emphasised meaning, ultimately, the possibility to include the exclusive data into a global fitter framework to provide constraints on the small $x$ gluon.
002683217 520__ $$9arXiv$$aWe discuss how the stability of the theoretical prediction for exclusive $J/\psi$ photoproduction has been improved through a systematic taming of the known $\overline{\text{MS}}$ coefficient functions by accounting for a formally power suppressed, but numerically significant, correction encoded within a $Q_0$ cut. The phenomenological implications of this will be emphasised meaning, ultimately, the possibility to include the exclusive data into a global fitter framework to provide constraints on the small $x$ gluon.
002683217 540__ $$3preprint$$aCC-BY-4.0$$uhttp://creativecommons.org/licenses/by/4.0/
002683217 540__ $$3publication$$aCC-BY-NC-ND-4.0$$bSISSA
002683217 542__ $$dThe authors
002683217 595__ $$aCERN-TH
002683217 65017 $$2arXiv$$ahep-ph
002683217 65017 $$2SzGeCERN$$aParticle Physics - Phenomenology
002683217 690C_ $$aCERN
002683217 690C_ $$aARTICLE
002683217 700__ $$aJones, [email protected]$$uCERN$$vTheoretical Physics Department, CERN, Geneva, Switzerland
002683217 700__ $$aMartin, [email protected]$$uDurham U., IPPP$$vInstitute for Particle Physics Phenomenology, Durham University, DH1 3LE Durham
002683217 700__ $$aRyskin, M.G.$$uDurham U., IPPP$$uSt. Petersburg, INP$$vInstitute for Particle Physics Phenomenology, Durham University, DH1 3LE Durham$$vPetersburg Nuclear Physics Institute, NRC Kurchatov Institute, 188300 Gatchina, St. Petersburg, Russia
002683217 700__ $$aTeubner, T.$$uLiverpool U., Dept. Math.$$vDepartment of Mathematical Sciences, University of Liverpool, L69 3BX Liverpool, U.K
002683217 773__ $$c053$$pPoS$$vDIS2019$$wC19-04-08$$y2019
002683217 8564_ $$81501386$$s30478$$uhttp://cds.cern.ch/record/2683217/files/Partons.png$$y00002 The quark contribution is seen to be almost vanishing and the scale dependence is small throughout the HERA and LHCb regions (left panel). Plot showing the large uncertainty between the global parton predictions in the LHCb regime. The typical $x \simeq 2 \xi$ values probed are shown on the upper axis. (right panel)
002683217 8564_ $$81501387$$s10540$$uhttp://cds.cern.ch/record/2683217/files/FIG4RIGHTFINAL.png$$y00000 Results of $\text{Im}\, A/W^2$ \text{vs.} $W$ for the scale fixing procedure (left panel) and the implementation of a $Q_0$ cut (right panel), using CTEQ6.6 partons with $\mu^2_F = m_c^2 = 2.4\,\text{GeV}^2$ fixed.
002683217 8564_ $$81501388$$s429747$$uhttp://cds.cern.ch/record/2683217/files/1907.06471.pdf$$yFulltext
002683217 8564_ $$81501389$$s6580$$uhttp://cds.cern.ch/record/2683217/files/Fig2Gluon.png$$y00004 Five leg pomeron-like exchange diagrams at LO (left panel) and NLO (right panel). The perturbatively calculable coefficients are denoted by $C_{g,q}$ and the GPDs by $F_{g,q}$, with parton momentum fractions $x=X+\xi$ and $x' = X-\xi$.
002683217 8564_ $$81501390$$s12200$$uhttp://cds.cern.ch/record/2683217/files/FIG3FINAL.png$$y00003 $\overline{\text{MS}}$ scale variations of $\text{Im}\, A/W^2$ at LO and NLO generated using CTEQ6.6 global partons at $\mu_F^2 = \mu_R^2 = 1.2,2.4,4.8\, \text{GeV}^2$. $\text{Im}\, A$ is the imaginary part of the amplitude.
002683217 8564_ $$81501391$$s6505$$uhttp://cds.cern.ch/record/2683217/files/Fig2Quark.png$$y00001 Five leg pomeron-like exchange diagrams at LO (left panel) and NLO (right panel). The perturbatively calculable coefficients are denoted by $C_{g,q}$ and the GPDs by $F_{g,q}$, with parton momentum fractions $x=X+\xi$ and $x' = X-\xi$.
002683217 8564_ $$81501392$$s16166$$uhttp://cds.cern.ch/record/2683217/files/Fig1EPSFINAL.png$$y00006 The two independent subprocesses contributing to the ultraperipheral cross section. The exchange at energy $W_+$ allows for a probe of smaller $x$, while the $W_-$ exchange is typically at larger $x$, where there is already significant data support from HERA. The $q_T$ of the photon is small.
002683217 8564_ $$81501393$$s9673$$uhttp://cds.cern.ch/record/2683217/files/Amp.png$$y00005 The quark contribution is seen to be almost vanishing and the scale dependence is small throughout the HERA and LHCb regions (left panel). Plot showing the large uncertainty between the global parton predictions in the LHCb regime. The typical $x \simeq 2 \xi$ values probed are shown on the upper axis. (right panel)
002683217 8564_ $$81501394$$s10551$$uhttp://cds.cern.ch/record/2683217/files/FIG4LEFTFINAL.png$$y00007 Results of $\text{Im}\, A/W^2$ \text{vs.} $W$ for the scale fixing procedure (left panel) and the implementation of a $Q_0$ cut (right panel), using CTEQ6.6 partons with $\mu^2_F = m_c^2 = 2.4\,\text{GeV}^2$ fixed.
002683217 8564_ $$81520141$$s417127$$uhttp://cds.cern.ch/record/2683217/files/PoS(DIS2019)053.pdf$$yFulltext
002683217 960__ $$a13
002683217 962__ $$b2668733$$k053$$nturin20190408
002683217 980__ $$aConferencePaper
002683217 980__ $$aARTICLE