A measurement of the t dependence of the helicity structure of diffractive ρ meson electroproduction 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

doi:10.1016/S0370-2693(02)02035-X

A measurement of the t dependence of the helicity structure of diffractive ρ meson electroproduction 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

Physics and Astronomy

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Abstract

The helicity structure of the diffractive electroproduction of rho mesons, e + p --> e + rho + Y, is studied in a previously unexplored region of large four-momentum transfer squared at the proton vertex, t: 0 <t' <3 GeV2, where t' = \t\ - \t\ min. The data used are collected with the HI detector at HERA in the kinematic domain 2.5 <Q(2) <60 GeV2, 40 <W <120 GeV No t dependence of the r(00)(04) spin density matrix element is found. A significant t dependent helicity non-conservation from the virtual photon to the rho meson is observed for the spin density matrix element combinations r(00)(5) + 2r(11)(5) and r(00)(1) + 2r(11)(1). These t dependences are consistently described by a perturbative QCD model based on the exchange of two gluons. (C) 2002 Elsevier Science B.V. All rights reserved.

Original language	English
Pages (from-to)	25
Number of pages	1
Journal	Physics Letters B
Volume	539
Issue number	1-2
DOIs	https://doi.org/10.1016/S0370-2693(02)02035-X
Publication status	Published - 11 Jul 2002

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@article{b586a85364fd429082cdd446726bbd4b,

title = "A measurement of the t dependence of the helicity structure of diffractive ρ meson electroproduction at HERA",

abstract = "The helicity structure of the diffractive electroproduction of rho mesons, e + p --> e + rho + Y, is studied in a previously unexplored region of large four-momentum transfer squared at the proton vertex, t: 0 <t' <3 GeV2, where t' = \t\ - \t\ min. The data used are collected with the HI detector at HERA in the kinematic domain 2.5 <Q(2) <60 GeV2, 40 <W <120 GeV No t dependence of the r(00)(04) spin density matrix element is found. A significant t dependent helicity non-conservation from the virtual photon to the rho meson is observed for the spin density matrix element combinations r(00)(5) + 2r(11)(5) and r(00)(1) + 2r(11)(1). These t dependences are consistently described by a perturbative QCD model based on the exchange of two gluons. (C) 2002 Elsevier Science B.V. All rights reserved.",

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",

year = "2002",

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doi = "10.1016/S0370-2693(02)02035-X",

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T1 - A measurement of the t dependence of the helicity structure of diffractive ρ meson electroproduction 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

PY - 2002/7/11

Y1 - 2002/7/11

N2 - The helicity structure of the diffractive electroproduction of rho mesons, e + p --> e + rho + Y, is studied in a previously unexplored region of large four-momentum transfer squared at the proton vertex, t: 0 <t' <3 GeV2, where t' = \t\ - \t\ min. The data used are collected with the HI detector at HERA in the kinematic domain 2.5 <Q(2) <60 GeV2, 40 <W <120 GeV No t dependence of the r(00)(04) spin density matrix element is found. A significant t dependent helicity non-conservation from the virtual photon to the rho meson is observed for the spin density matrix element combinations r(00)(5) + 2r(11)(5) and r(00)(1) + 2r(11)(1). These t dependences are consistently described by a perturbative QCD model based on the exchange of two gluons. (C) 2002 Elsevier Science B.V. All rights reserved.

AB - The helicity structure of the diffractive electroproduction of rho mesons, e + p --> e + rho + Y, is studied in a previously unexplored region of large four-momentum transfer squared at the proton vertex, t: 0 <t' <3 GeV2, where t' = \t\ - \t\ min. The data used are collected with the HI detector at HERA in the kinematic domain 2.5 <Q(2) <60 GeV2, 40 <W <120 GeV No t dependence of the r(00)(04) spin density matrix element is found. A significant t dependent helicity non-conservation from the virtual photon to the rho meson is observed for the spin density matrix element combinations r(00)(5) + 2r(11)(5) and r(00)(1) + 2r(11)(1). These t dependences are consistently described by a perturbative QCD model based on the exchange of two gluons. (C) 2002 Elsevier Science B.V. All rights reserved.

U2 - 10.1016/S0370-2693(02)02035-X

DO - 10.1016/S0370-2693(02)02035-X

M3 - Article

VL - 539

SP - 25

JO - Physics Letters B

JF - Physics Letters B

IS - 1-2

ER -

A measurement of the t dependence of the helicity structure of diffractive ρ meson electroproduction at HERA

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