Single-spin azimuthal asymmetries in electroproduction of neutral pions in semi-inclusive deep-inelastic scattering

HERMES Collaboration

doi:10.1103/PhysRevD.64.097101

Single-spin azimuthal asymmetries in electroproduction of neutral pions in semi-inclusive deep-inelastic scattering

HERMES Collaboration

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

Abstract

A single-spin asymmetry in the azimuthal distribution of neutral pions relative to the lepton scattering plane has been measured for the first time in deep-inelastic scattering of positrons off longitudinally polarized protons. The analyzing power in the sin phi moment of the cross section is 0.019 +/-0.007(stat) 0.003(syst). This result is compared to single-spin asymmetries for charged pion production measured in the same kinematic range. The pi (0) asymmetry is of the same size as the pi (+) asymmetry and shows a similar dependence on the relevant kinematic variables. The asymmetry is described by a phenomenological calculation based on a fragmentation function that represents sensitivity to the transverse polarization of the struck quark.

Original language	English
Article number	097101
Number of pages	4
Journal	Physical Review D
Volume	64
Issue number	9
DOIs	https://doi.org/10.1103/PhysRevD.64.097101
Publication status	Published - 1 Nov 2001
Externally published	Yes

Keywords

ODD PARTON DISTRIBUTIONS
FRAGMENTATION FUNCTIONS
NUCLEONS
QUARK

Access to Document

10.1103/PhysRevD.64.097101

Cite this

@article{5e774f2154a749458f394c14a887bd04,

title = "Single-spin azimuthal asymmetries in electroproduction of neutral pions in semi-inclusive deep-inelastic scattering",

abstract = "A single-spin asymmetry in the azimuthal distribution of neutral pions relative to the lepton scattering plane has been measured for the first time in deep-inelastic scattering of positrons off longitudinally polarized protons. The analyzing power in the sin phi moment of the cross section is 0.019 +/-0.007(stat) 0.003(syst). This result is compared to single-spin asymmetries for charged pion production measured in the same kinematic range. The pi (0) asymmetry is of the same size as the pi (+) asymmetry and shows a similar dependence on the relevant kinematic variables. The asymmetry is described by a phenomenological calculation based on a fragmentation function that represents sensitivity to the transverse polarization of the struck quark.",

keywords = "ODD PARTON DISTRIBUTIONS, FRAGMENTATION FUNCTIONS, NUCLEONS, QUARK",

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 B. Bains 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 W. Bruckner 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 V. Djordjadze and M. Duren and M. Ehrenfried and G. Elbakian and F. Ellinghaus and J. Ely and A. Fantoni and A. Fechtchenko and L. Felawka and {van den Brand}, J.F.J. and {HERMES Collaboration}",

year = "2001",

month = nov,

day = "1",

doi = "10.1103/PhysRevD.64.097101",

language = "English",

volume = "64",

journal = "Physical Review D",

issn = "1550-7998",

publisher = "American Physical Society",

number = "9",

}

TY - JOUR

T1 - Single-spin azimuthal asymmetries in electroproduction of neutral pions in semi-inclusive deep-inelastic scattering

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 - Bains, B.

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 - Bruckner, W.

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 - Djordjadze, V.

AU - Duren, M.

AU - Ehrenfried, M.

AU - Elbakian, G.

AU - Ellinghaus, F.

AU - Ely, J.

AU - Fantoni, A.

AU - Fechtchenko, A.

AU - Felawka, L.

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

AU - HERMES Collaboration

PY - 2001/11/1

Y1 - 2001/11/1

N2 - A single-spin asymmetry in the azimuthal distribution of neutral pions relative to the lepton scattering plane has been measured for the first time in deep-inelastic scattering of positrons off longitudinally polarized protons. The analyzing power in the sin phi moment of the cross section is 0.019 +/-0.007(stat) 0.003(syst). This result is compared to single-spin asymmetries for charged pion production measured in the same kinematic range. The pi (0) asymmetry is of the same size as the pi (+) asymmetry and shows a similar dependence on the relevant kinematic variables. The asymmetry is described by a phenomenological calculation based on a fragmentation function that represents sensitivity to the transverse polarization of the struck quark.

AB - A single-spin asymmetry in the azimuthal distribution of neutral pions relative to the lepton scattering plane has been measured for the first time in deep-inelastic scattering of positrons off longitudinally polarized protons. The analyzing power in the sin phi moment of the cross section is 0.019 +/-0.007(stat) 0.003(syst). This result is compared to single-spin asymmetries for charged pion production measured in the same kinematic range. The pi (0) asymmetry is of the same size as the pi (+) asymmetry and shows a similar dependence on the relevant kinematic variables. The asymmetry is described by a phenomenological calculation based on a fragmentation function that represents sensitivity to the transverse polarization of the struck quark.

KW - ODD PARTON DISTRIBUTIONS

KW - FRAGMENTATION FUNCTIONS

KW - NUCLEONS

KW - QUARK

U2 - 10.1103/PhysRevD.64.097101

DO - 10.1103/PhysRevD.64.097101

M3 - Article

SN - 1550-7998

VL - 64

JO - Physical Review D

JF - Physical Review D

IS - 9

M1 - 097101

ER -