Ratios of helicity amplitudes for exclusive ρ0 electroproduction

被引：22

作者：

Airapetian, A. ^{[13
,16
]}

Akopov, N. ^{[28
]}

Akopov, Z. ^{[5
]}

Aschenauer, E. C. ^{[6
]}

Augustyniak, W. ^{[27
]}

Avakian, R. ^{[28
]}

Avetissian, A. ^{[28
]}

Avetisyan, E. ^{[5
]}

Belostotski, S. ^{[19
]}

Bianchi, N. ^{[11
]}

Blok, H. P. ^{[18
,26
]}

Borissov, A. ^{[5
]}

Bowles, J. ^{[14
]}

Bryzgalov, V. ^{[20
]}

Burns, J. ^{[14
]}

Capiluppi, M. ^{[9
,10
]}

Capitani, G. P. ^{[11
]}

Cisbani, E. ^{[22
,23
]}

Ciullo, G. ^{[9
,10
]}

Contalbrigo, M. ^{[9
,10
]}

Dalpiaz, P. F. ^{[9
,10
]}

Deconinck, W. ^{[5
]}

De Leo, R. ^{[2
]}

De Nardo, L. ^{[5
,12
]}

De Sanctis, E. ^{[11
]}

Diefenthaler, M. ^{[8
,15
]}

Di Nezza, P. ^{[11
]}

Dueren, M. ^{[13
]}

Ehrenfried, M. ^{[13
]}

Elbakian, G. ^{[28
]}

Ellinghaus, F. ^{[4
]}

Fabbri, R. ^{[6
]}

Fantoni, A. ^{[11
]}

Felawka, L. ^{[24
]}

Frullani, S. ^{[22
,23
]}

Gabbert, D. ^{[6
]}

Gapienko, G. ^{[20
]}

Gapienko, V. ^{[20
]}

Garibaldi, F. ^{[22
,23
]}

Gavrilov, G. ^{[5
,19
,24
]}

Gharibyan, V. ^{[28
]}

Giordano, F. ^{[5
,9
,10
]}

Gliske, S. ^{[16
]}

Golembiovskaya, M. ^{[6
]}

Hadjidakis, C. ^{[11
]}

Hartig, M. ^{[5
]}

Hasch, D. ^{[11
]}

Hill, G. ^{[14
]}

Hillenbrand, A. ^{[6
]}

Hoek, M. ^{[14
]}

机构：

[1] Argonne Natl Lab, Div Phys, Argonne, IL 60439 USA

[2] Ist Nazl Fis Nucl, Sez Bari, I-70124 Bari, Italy

[3] Peking Univ, Sch Phys, Beijing 100871, Peoples R China

[4] Univ Colorado, Nucl Phys Lab, Boulder, CO 80309 USA

[5] DESY, D-22603 Hamburg, Germany

[6] DESY, D-15738 Zeuthen, Germany

[7] Joint Inst Nucl Res, Dubna 141980, Russia

[8] Univ Erlangen Nurnberg, Inst Phys, D-91058 Erlangen, Germany

[9] Univ Ferrara, Ist Nazl Fis Nucl, Sez Ferrara, I-44100 Ferrara, Italy

[10] Univ Ferrara, Dipartimento Fis, I-44100 Ferrara, Italy

[11] Ist Nazl Fis Nucl, Lab Nazl Frascati, I-00044 Frascati, Italy

[12] Univ Ghent, Dept Subat & Radiat Phys, B-9000 Ghent, Belgium

[13] Univ Giessen, Inst Phys, D-35392 Giessen, Germany

[14] Univ Glasgow, SUPA, Sch Phys & Astron, Glasgow G12 8QQ, Lanark, Scotland

[15] Univ Illinois, Dept Phys, Urbana, IL 61801 USA

[16] Univ Michigan, Randall Lab Phys, Ann Arbor, MI 48109 USA

[17] PN Lebedev Phys Inst, Moscow 117924, Russia

[18] Natl Inst Subat Phys Nikhef, NL-1009 DB Amsterdam, Netherlands

[19] St Petersburg Nucl Phys Inst, Gatchina 188300, Leningrad Reg, Russia

[20] Inst High Energy Phys, Protvino 142281, Moscow Region, Russia

[21] Univ Regensburg, Inst Theoret Phys, D-93040 Regensburg, Germany

[22] Ist Nazl Fis Nucl, Grp Sanita, Sez Roma 1, Rome, Italy

[23] Ist Super Sanita, Phys Lab, I-00161 Rome, Italy

[24] TRIUMF, Vancouver, BC V6T 2A3, Canada

[25] Tokyo Inst Technol, Dept Phys, Tokyo 152, Japan

[26] Vrije Univ Amsterdam, Dept Phys & Astron, NL-1081 HV Amsterdam, Netherlands

[27] Andrzej Soltan Inst Nucl Studies, PL-00689 Warsaw, Poland

[28] Yerevan Phys Inst, Yerevan 375036, Armenia

来源：

EUROPEAN PHYSICAL JOURNAL C | 2011年 / 71卷 / 04期

基金：

中国国家自然科学基金; 加拿大自然科学与工程研究理事会; 英国工程与自然科学研究理事会; 美国国家科学基金会; 英国科学技术设施理事会;

关键词：

VECTOR-MESON PRODUCTION; ELASTIC ELECTROPRODUCTION; J/PSI MESONS; SCATTERING; POLARIZATION; POLARIMETER; ELECTRONS; HYDROGEN; PHOTON; PROTON;

D O I：

10.1140/epjc/s10052-011-1609-2

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

Exclusive rho(0)-meson electroproduction is studied in the HERMES experiment, using a 27.6 GeV longitudinally polarized electron/positron beam and unpolarized hydrogen and deuterium targets in the kinematic region 0.5 GeV2 < Q(2) < 7.0 GeV2, 3.0 GeV < W < 6.3 GeV, and -t' < 0.4 GeV2. Real and imaginary parts of the ratios of the natural-parity-exchange helicity amplitudes T-11 (gamma*(T) -> rho T), T-01 (gamma*(T) -> rho(L)), T-10 (gamma*(L) -> rho(T)), and T1-1 (gamma*(-T) -> rho(T)) to T-00 (gamma*(L) -> rho(L)) are extracted from the data. For the unnatural-parity-exchange amplitude U-11, the ratio vertical bar U-11/T-00 vertical bar is obtained. The Q(2) and t' dependences of these ratios are presented and compared with perturbative QCD predictions.

引用

页码：1 / 25

页数：25

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