Single-spin azimuthal asymmetry in exclusive electroproduction of pi(+) mesons

HERMES Collaboration

doi:10.1016/S0370-2693(02)01780-X

Single-spin azimuthal asymmetry in exclusive electroproduction of pi(+) mesons

HERMES Collaboration

Research output: Contribution to journal › Article › Academic › peer-review

Abstract

A single-spin asymmetry in the distribution of exclusively produced pi(+) mesons azimuthally around the virtual photon direction relative to the lepton scattering plane has been measured for the first time in deep-inelastic scattering of positrons off longitudinally polarized protons. Integrated over the experimental acceptance, the sin moment of the polarization asymmetry of the cross section is measured to be -0.18 +/- 0.05(stat.) +/- 0.02(syst.). The asymmetry is also studied as a function of the relevant kinematic variables, and its magnitude is found to grow with decreasing x and increasing -t and vanish at t --> t(min) (where x is the Bjorken scaling variable and t is the squared four-momentum transferred to the nucleon). (C) 2002 Elsevier Science B.V. All rights reserved.

Original language	English
Pages (from-to)	85-92
Number of pages	8
Journal	Physics Letters B
Volume	535
Issue number	1-4
DOIs	https://doi.org/10.1016/S0370-2693(02)01780-X
Publication status	Published - 23 May 2002
Externally published	Yes

Keywords

LEADING ORDER

Access to Document

10.1016/S0370-2693(02)01780-XLicence: Unspecified

Cite this

@article{24ca6a8c5c134f848357fea11ca5930d,

title = "Single-spin azimuthal asymmetry in exclusive electroproduction of pi(+) mesons",

abstract = "A single-spin asymmetry in the distribution of exclusively produced pi(+) mesons azimuthally around the virtual photon direction relative to the lepton scattering plane has been measured for the first time in deep-inelastic scattering of positrons off longitudinally polarized protons. Integrated over the experimental acceptance, the sin moment of the polarization asymmetry of the cross section is measured to be -0.18 +/- 0.05(stat.) +/- 0.02(syst.). The asymmetry is also studied as a function of the relevant kinematic variables, and its magnitude is found to grow with decreasing x and increasing -t and vanish at t --> t(min) (where x is the Bjorken scaling variable and t is the squared four-momentum transferred to the nucleon). (C) 2002 Elsevier Science B.V. All rights reserved.",

keywords = "LEADING ORDER",

author = "A. Airapetian and N. Akopov and Z. Akopov and M. Amarian and E.C. Aschenauer and H. Avakian and R. Avakian and A. Avetissian and E. Avetissian and P. Bailey and V. Baturin and C. Baumgarten and M. Beckmann and S. Belostotski and S. Bernreuther and N. Bianchi and H. Bottcher and A. Borissov and O. Bouhali and M. Bouwhuis and J. Brack and S. Brauksiepe and A. Brull and I. Brunn and H.J. Bulten and G.P. Capitani and P. Chumney and E. Cisbani and G. Ciullo and G.R. Court and P.F. Dalpiaz and {De Leo}, R. and {De Nardo}, L. and {De Sanctis}, E. and {De Schepper}, D. and E. Devitsin and P.K.A.D. Huberts and {Di Nezza}, P. and M. Duren and M. Ehrenfried and G. Elbakian and F. Ellinghaus and J. Ely and R. Fabbri and A. Fantoni and A. Fechtchenko and L. Felawka and B.W. Filippone and H. Fischer and {van den Brand}, J.F.J. and {HERMES Collaboration}",

year = "2002",

month = may,

day = "23",

doi = "10.1016/S0370-2693(02)01780-X",

language = "English",

volume = "535",

pages = "85--92",

journal = "Physics Letters B",

issn = "0370-2693",

publisher = "Elsevier",

number = "1-4",

}

TY - JOUR

T1 - Single-spin azimuthal asymmetry in exclusive electroproduction of pi(+) mesons

AU - Airapetian, A.

AU - Akopov, N.

AU - Akopov, Z.

AU - Amarian, M.

AU - Aschenauer, E.C.

AU - Avakian, H.

AU - Avakian, R.

AU - Avetissian, A.

AU - Avetissian, E.

AU - Bailey, P.

AU - Baturin, V.

AU - Baumgarten, C.

AU - Beckmann, M.

AU - Belostotski, S.

AU - Bernreuther, S.

AU - Bianchi, N.

AU - Bottcher, H.

AU - Borissov, A.

AU - Bouhali, O.

AU - Bouwhuis, M.

AU - Brack, J.

AU - Brauksiepe, S.

AU - Brull, A.

AU - Brunn, I.

AU - Bulten, H.J.

AU - Capitani, G.P.

AU - Chumney, P.

AU - Cisbani, E.

AU - Ciullo, G.

AU - Court, G.R.

AU - Dalpiaz, P.F.

AU - De Leo, R.

AU - De Nardo, L.

AU - De Sanctis, E.

AU - De Schepper, D.

AU - Devitsin, E.

AU - Huberts, P.K.A.D.

AU - Di Nezza, P.

AU - Duren, M.

AU - Ehrenfried, M.

AU - Elbakian, G.

AU - Ellinghaus, F.

AU - Ely, J.

AU - Fabbri, R.

AU - Fantoni, A.

AU - Fechtchenko, A.

AU - Felawka, L.

AU - Filippone, B.W.

AU - Fischer, H.

AU - van den Brand, J.F.J.

AU - HERMES Collaboration

PY - 2002/5/23

Y1 - 2002/5/23

N2 - A single-spin asymmetry in the distribution of exclusively produced pi(+) mesons azimuthally around the virtual photon direction relative to the lepton scattering plane has been measured for the first time in deep-inelastic scattering of positrons off longitudinally polarized protons. Integrated over the experimental acceptance, the sin moment of the polarization asymmetry of the cross section is measured to be -0.18 +/- 0.05(stat.) +/- 0.02(syst.). The asymmetry is also studied as a function of the relevant kinematic variables, and its magnitude is found to grow with decreasing x and increasing -t and vanish at t --> t(min) (where x is the Bjorken scaling variable and t is the squared four-momentum transferred to the nucleon). (C) 2002 Elsevier Science B.V. All rights reserved.

AB - A single-spin asymmetry in the distribution of exclusively produced pi(+) mesons azimuthally around the virtual photon direction relative to the lepton scattering plane has been measured for the first time in deep-inelastic scattering of positrons off longitudinally polarized protons. Integrated over the experimental acceptance, the sin moment of the polarization asymmetry of the cross section is measured to be -0.18 +/- 0.05(stat.) +/- 0.02(syst.). The asymmetry is also studied as a function of the relevant kinematic variables, and its magnitude is found to grow with decreasing x and increasing -t and vanish at t --> t(min) (where x is the Bjorken scaling variable and t is the squared four-momentum transferred to the nucleon). (C) 2002 Elsevier Science B.V. All rights reserved.

KW - LEADING ORDER

U2 - 10.1016/S0370-2693(02)01780-X

DO - 10.1016/S0370-2693(02)01780-X

M3 - Article

SN - 0370-2693

VL - 535

SP - 85

EP - 92

JO - Physics Letters B

JF - Physics Letters B

IS - 1-4

ER -