Measurement of the hadronic photon structure function F2γ at LEP2

被引：26

作者：

Abbiendi, G ^{[1
]}

Ainsley, C

Åkesson, PF

Alexander, G

Allison, J

Anagnostou, G

Anderson, KJ

Asai, S

Axen, D

Azuelos, G

Bailey, I

Barberio, E

Barlow, RJ

Batley, RJ

Bechtle, P

Behnke, T

Bell, KW

Bell, PJ

Bella, G

Bellerive, A

Benelli, G

Bethke, S

Biebel, O

Bloodworth, IJ

Boeriu, O

Bock, P

Bonacorsi, D

Boutemeur, M

Braibant, S

Brigliadori, L

Brown, RM

Buesser, K

Burckhart, HJ

Cammin, J

Campana, S

Carnegie, RK

Caron, B

Carter, AA

Carter, JR

Chang, CY

Charlton, DG

Cohen, I

Csilling, A

Cuffiani, M

Dado, S

Dallavalle, GM

Dallison, S

De Roeck, A

De Wolf, EA

Desch, K

机构：

[1] Univ Birmingham, Sch Phys & Astron, Birmingham B15 2TT, W Midlands, England

[2] Univ Bologna, Dipartmento Fis, I-40126 Bologna, Italy

[3] Ist Nazl Fis Nucl, I-40126 Bologna, Italy

[4] Univ Bonn, Inst Phys, D-53115 Bonn, Germany

[5] Univ Calif Riverside, Dept Phys, Riverside, CA 92521 USA

[6] Univ Cambridge, Cavendish Lab, Cambridge CB3 0HE, England

[7] Carleton Univ, Dept Phys, Ottawa Carleton Inst Phys, Ottawa, ON K1S 5B6, Canada

[8] CERN, European Org Nucl Res, CH-1211 Geneva, Switzerland

[9] Univ Chicago, Enrico Fermi Inst, Chicago, IL 60637 USA

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

[11] Heidelberg Univ, Inst Phys, D-69120 Heidelberg, Germany

[12] Indiana Univ, Dept Phys, Bloomington, IN 47405 USA

[13] Queen Mary Univ London, London E1 4NS, England

[14] Rhein Westfal TH Aachen, Inst Phys 3, D-52056 Aachen, Germany

[15] UCL, London WC1E 6BT, England

[16] Univ Manchester, Schuster Lab, Dept Phys, Manchester M13 9PL, Lancs, England

[17] Univ Maryland, Dept Phys, College Pk, MD 20742 USA

[18] Univ Montreal, Phys Nucl Lab, Montreal, PQ H3C 3J7, Canada

[19] Univ Oregon, Dept Phys, Eugene, OR 97403 USA

[20] Rutherford Appleton Lab, CLCR, Didcot OX11 0QX, Oxon, England

[21] Technion Israel Inst Technol, Dept Phys, IL-32000 Haifa, Israel

[22] Tel Aviv Univ, Dept Phys & Astron, IL-69978 Tel Aviv, Israel

[23] Univ Tokyo, Dept Phys, Tokyo 1130033, Japan

[24] Kobe Univ, Kobe, Hyogo 6578501, Japan

[25] Weizmann Inst Sci, Particle Phys Dept, IL-76100 Rehovot, Israel

[26] Univ Hamburg, Inst Expt Phys 2, D-22607 Hamburg, Germany

[27] Univ Victoria, Dept Phys, Victoria, BC V8W 3P6, Canada

[28] Univ British Columbia, Dept Phys, Vancouver, BC V6T 1Z1, Canada

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

[30] Res Inst Particle & Nucl Phys, H-1525 Budapest, Hungary

[31] Inst Nucl Res, H-4001 Debrecen, Hungary

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

[33] Max Planck Inst Phys & Astrophys, D-80805 Munich, Germany

[34] Yale Univ, Dept Phys, New Haven, CT 06520 USA

[35] Univ Chicago, Dept Phys, Chicago, IL 60637 USA

[36] Univ Tokyo, International Ctr Elementary Particle Phys, Tokyo 1130033, Japan

来源：

PHYSICS LETTERS B | 2002年 / 533卷 / 3-4期

基金：

日本学术振兴会; 加拿大自然科学与工程研究理事会; 以色列科学基金会; 美国国家科学基金会;

关键词：

D O I：

10.1016/S0370-2693(02)01560-5

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The hadronic structure function of the photon F-2(gamma) (x, Q(2)) is measured as a function of Bjorken x and of the photon virtuality Q(2) using deep-inelastic scattering data taken by the OPAL detector at LEP at e(+)e(-) centre-of-mass energies from 183 to 209 GeV Previous OPAL measurements of the x dependence of F-2(gamma) are extended to an average Q(2) of <Q(2)> = 780 GeV2 using data in the kinematic range 0.15 < x < 0.98. The Q(2) evolution of F-2(gamma) is studied for 12.1 < < Q(2)> < 780 GeV2 using three ranges of x. As predicted by QCD, the data show positive scaling violations in F-2(gamma) with F-2(gamma) (Q(2))/alpha = (0.08 +/- 0.02(-0.03)(+0.05)) + (0.13 +/- 0.01(-0.01)(+0.01)) In Q(2), where Q(2) is in GeV2, for the central x region 0.10-0.60. Several parameterisations of F-2(gamma) are in qualitative agreement with the measurements whereas the quark-parton model prediction fails to describe the data. (C) 2002 Elsevier Science B.V. All rights reserved.

引用

页码：207 / 222

页数：16

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