Diffractive photoproduction of J/ψ mesons with large momentum transfer at HERA

C Adloff; Yves Coppens; John Dowell; Peter Faulkner; Yves Fleming; John Garvey; Carrie Johnson; Ian Kenyon; David Lamb; Paul Newman; Syed Rizvi; Paul Thompson; Ethan-Etienne Woehrling; Oliver Henshaw

doi:10.1016/j.physletb.2003.06.056

Diffractive photoproduction of J/ψ mesons with large momentum transfer at HERA

C Adloff, Yves Coppens, John Dowell, Peter Faulkner, Yves Fleming, John Garvey, Carrie Johnson, Ian Kenyon, David Lamb, Paul Newman, Syed Rizvi, Paul Thompson, Ethan-Etienne Woehrling, Oliver Henshaw

Physics and Astronomy

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Abstract

The diffractive photoproduction of J/psi mesons is measured with the HI detector at the ep collider HERA using an integrated luminosity of 78 pb(-1). The differential cross section dsigma(gammap --> J/psiY)/dt is studied in the range 2 <\t\ <30 GeV2, where t is the square of the four-momentum transferred at the proton vertex. The cross section is also presented as a function of the photon-proton centre-of-mass energy W-gammap in three t intervals, spanning the range 50 <W-gammap <200 GeV. A fast rise of the cross section with W-gammap is observed for each t range and the slope for the effective linear Pomeron trajectory is measured to be alpha' = -0.0135 +/- 0.0074(stat.) +/- 0.0051(syst.) GeV-2. The measurements are compared with perturbative QCD models based on BFKL and DGLAP evolution. The data are found to be compatible with s-channel helicity conservation. (C) 200 Published by Elsevier B.V.

Original language	English
Pages (from-to)	205-218
Number of pages	14
Journal	Physics Letters B
Volume	568
Issue number	3-4
DOIs	https://doi.org/10.1016/j.physletb.2003.06.056
Publication status	Published - 28 Aug 2003

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@article{d370586f4f1644668ecd989af35ba9d0,

title = "Diffractive photoproduction of J/ψ mesons with large momentum transfer at HERA",

abstract = "The diffractive photoproduction of J/psi mesons is measured with the HI detector at the ep collider HERA using an integrated luminosity of 78 pb(-1). The differential cross section dsigma(gammap --> J/psiY)/dt is studied in the range 2 <\t\ <30 GeV2, where t is the square of the four-momentum transferred at the proton vertex. The cross section is also presented as a function of the photon-proton centre-of-mass energy W-gammap in three t intervals, spanning the range 50 <W-gammap <200 GeV. A fast rise of the cross section with W-gammap is observed for each t range and the slope for the effective linear Pomeron trajectory is measured to be alpha' = -0.0135 +/- 0.0074(stat.) +/- 0.0051(syst.) GeV-2. The measurements are compared with perturbative QCD models based on BFKL and DGLAP evolution. The data are found to be compatible with s-channel helicity conservation. (C) 200 Published by Elsevier B.V.",

author = "C Adloff and Yves Coppens and John Dowell and Peter Faulkner and Yves Fleming and John Garvey and Carrie Johnson and Ian Kenyon and David Lamb and Paul Newman and Syed Rizvi and Paul Thompson and Ethan-Etienne Woehrling and Oliver Henshaw",

year = "2003",

month = aug,

day = "28",

doi = "10.1016/j.physletb.2003.06.056",

language = "English",

volume = "568",

pages = "205--218",

journal = "Physics Letters B",

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TY - JOUR

T1 - Diffractive photoproduction of J/ψ mesons with large momentum transfer at HERA

AU - Adloff, C

AU - Coppens, Yves

AU - Dowell, John

AU - Faulkner, Peter

AU - Fleming, Yves

AU - Garvey, John

AU - Johnson, Carrie

AU - Kenyon, Ian

AU - Lamb, David

AU - Newman, Paul

AU - Rizvi, Syed

AU - Thompson, Paul

AU - Woehrling, Ethan-Etienne

AU - Henshaw, Oliver

PY - 2003/8/28

Y1 - 2003/8/28

N2 - The diffractive photoproduction of J/psi mesons is measured with the HI detector at the ep collider HERA using an integrated luminosity of 78 pb(-1). The differential cross section dsigma(gammap --> J/psiY)/dt is studied in the range 2 <\t\ <30 GeV2, where t is the square of the four-momentum transferred at the proton vertex. The cross section is also presented as a function of the photon-proton centre-of-mass energy W-gammap in three t intervals, spanning the range 50 <W-gammap <200 GeV. A fast rise of the cross section with W-gammap is observed for each t range and the slope for the effective linear Pomeron trajectory is measured to be alpha' = -0.0135 +/- 0.0074(stat.) +/- 0.0051(syst.) GeV-2. The measurements are compared with perturbative QCD models based on BFKL and DGLAP evolution. The data are found to be compatible with s-channel helicity conservation. (C) 200 Published by Elsevier B.V.

AB - The diffractive photoproduction of J/psi mesons is measured with the HI detector at the ep collider HERA using an integrated luminosity of 78 pb(-1). The differential cross section dsigma(gammap --> J/psiY)/dt is studied in the range 2 <\t\ <30 GeV2, where t is the square of the four-momentum transferred at the proton vertex. The cross section is also presented as a function of the photon-proton centre-of-mass energy W-gammap in three t intervals, spanning the range 50 <W-gammap <200 GeV. A fast rise of the cross section with W-gammap is observed for each t range and the slope for the effective linear Pomeron trajectory is measured to be alpha' = -0.0135 +/- 0.0074(stat.) +/- 0.0051(syst.) GeV-2. The measurements are compared with perturbative QCD models based on BFKL and DGLAP evolution. The data are found to be compatible with s-channel helicity conservation. (C) 200 Published by Elsevier B.V.

U2 - 10.1016/j.physletb.2003.06.056

DO - 10.1016/j.physletb.2003.06.056

M3 - Article

VL - 568

SP - 205

EP - 218

JO - Physics Letters B

JF - Physics Letters B

IS - 3-4

ER -

Diffractive photoproduction of J/ψ mesons with large momentum transfer at HERA

Abstract

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