Double-spin asymmetry in the cross section for exclusive ρ0 production in lepton-proton scattering

被引：25

作者：

Airapetian, A ^{[1
]}

Akopov, N

Akopov, Z

Amarian, M

Arrington, J

Aschenauer, EC

Avakian, H

Avakian, R

Avetissian, A

Avetissian, E

Bailey, P

Bains, B

Baumgarten, C

Beckmann, M

Belostotski, S

Bernreuther, S

Bianchi, N

Böttcher, H

Borissov, A

Bouwhuis, M

Brack, J

Brauksiepe, S

Braun, B

Brückner, W

Brüll, A

Budz, P

Bulten, HJ

Capitani, GP

Carter, P

Chumney, P

Cisbani, E

Court, GR

Dalpiaz, PF

De Leo, R

De Nardo, L

De Sanctis, E

De Schepper, D

Devitsin, E

Huberts, PKAD

Di Nezza, P

Djordjadze, V

Düren, M

Dvoredsky, A

Elbakian, G

Ely, J

Fantoni, A

Fechtchenko, A

Felawka, L

Ferro-Luzzi, M

Fiedler, K

机构：

[1] Univ Alberta, Dept Phys, Edmonton, AB T6G 2J1, Canada

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

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

[4] CALTECH, WK Kellogg Radiat Lab, Pasadena, CA 91125 USA

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

[6] DESY, D-22603 Hamburg, Germany

[7] DESY Zeuthen, D-15738 Zeuthen, Germany

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

[9] Univ Erlangen Nurnberg, Inst Phys, D-91057 Erlangen, Germany

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

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

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

[13] Univ Freiburg, Fak Phys, D-79104 Freiburg, Germany

[14] Univ Ghent, Dept Subatom & Radiat Phys, B-9000 Ghent, Belgium

[15] Max Planck Inst Kernphys, D-69029 Heidelberg, Germany

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

[17] Univ Liverpool, Dept Phys, Liverpool L69 7ZE, Merseyside, England

[18] Univ Wisconsin, Dept Phys, Madison, WI 53706 USA

[19] MIT, Nucl Sci Lab, Cambridge, MA 02139 USA

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

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

[22] Univ Munich, Sekt Phys, D-85748 Garching, Germany

[23] New Mexico State Univ, Dept Phys, Las Cruces, NM 88003 USA

[24] NIKHEF, NL-1009 DB Amsterdam, Netherlands

[25] Petersburg Nucl Phys Inst, Gatchina 188350, Russia

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

[27] Ist Nazl Fis Nucl, Sez Roma 1, Grp Sanita, I-00161 Rome, Italy

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

[29] Simon Fraser Univ, Dept Phys, Burnaby, BC V5A 1S6, Canada

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

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

[32] Free Univ Amsterdam, Dept Phys & Astron, NL-1081 HV Amsterdam, Netherlands

[33] Yerevan Phys Inst, Yerevan 375036, Armenia

来源：

PHYSICS LETTERS B | 2001年 / 513卷 / 3-4期

基金：

加拿大自然科学与工程研究理事会; 美国国家科学基金会; 日本学术振兴会;

关键词：

lepton-nucleon scattering; rho production; asymmetries; photoabsorbtion;

D O I：

10.1016/S0370-2693(01)00639-6

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Evidence for a positive longitudinal double-spin asymmetry <A(l)(rho)> = 0.24 +/- 0.11(stat) +/- 0.02(syst) in the cross section for exclusive diffractive rho (0)(770) vector-meson production in polarised lepton-proton scattering was observed by the HERMES experiment. The longitudinally polarised 27.56 GeV HERA positron beam was scattered off a longitudinally polarised pure hydrogen gas target. The average invariant mass of the photon-proton system has a value of <W > = 4.9 GeV, while the average negative squared four-momentum of the virtual photon is <Q(2)> = 1.7 GeV2. The ratio of the present result to the corresponding spin asymmetry in inclusive deep-inelastic scattering is in agreement with an early theoretical prediction based on the generalised vector-meson dominance model. (C) 2001 Published by Elsevier Science B.V.

引用

页码：301 / 310

页数：10

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