Measurements of the QED structure of the photon

被引:16
作者
Abbiendi, G [1 ]
Ackerstaff, K
Alexander, G
Allison, J
Altekamp, N
Anderson, KJ
Anderson, S
Arcelli, S
Asai, S
Ashby, SF
Axen, D
Azuelos, G
Ball, AH
Barberio, E
Barlow, RJ
Batley, JR
Baumann, S
Bechtluft, J
Behnke, T
Bell, KW
Bella, G
Bellerive, A
Bentvelsen, S
Bethke, S
Betts, S
Biebel, O
Biguzzi, A
Blobel, V
Bloodworth, IJ
Bock, P
Böhme, J
Bonacorsi, D
Boutemeur, M
Braibant, S
Bright-Thomas, P
Brigliadori, L
Brown, RM
Burckhart, HJ
Capiluppi, P
Carnegie, RK
Carter, AA
Carter, JR
Chang, CY
Charlton, DG
Chrisman, D
Ciocca, C
Clarke, PEL
Clay, E
Cohen, I
Conboy, JE
机构
[1] Univ Bologna, Dipartmento Fis, I-40126 Bologna, Italy
[2] Ist Nazl Fis Nucl, I-40126 Bologna, Italy
[3] Univ Birmingham, Sch Phys & Astron, Birmingham B15 2TT, W Midlands, England
[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] Carleton Univ, Ctr Res Particle Phys, Ottawa, ON K1S 5B6, Canada
[9] CERN, European Org Particle Phys, CH-1211 Geneva 23, Switzerland
[10] Univ Chicago, Enrico Fermi Inst, Chicago, IL 60637 USA
[11] Univ Chicago, Dept Phys, Chicago, IL 60637 USA
[12] Univ Freiburg, Fak Phys, D-79104 Freiburg, Germany
[13] Univ Heidelberg, Inst Phys, D-69120 Heidelberg, Germany
[14] Indiana Univ, Dept Phys, Bloomington, IN 47405 USA
[15] Univ London Queen Mary & Westfield Coll, London E1 4NS, England
[16] Tech Hsch Aachen, Inst Phys 3, D-52056 Aachen, Germany
[17] UCL, London WC1E 6BT, England
[18] Univ Manchester, Schuster Lab, Dept Phys, Manchester M13 9PL, Lancs, England
[19] Univ Maryland, Dept Phys, College Pk, MD 20742 USA
[20] Univ Montreal, Phys Nucl Lab, Montreal, PQ H3C 3J7, Canada
[21] Univ Oregon, Dept Phys, Eugene, OR 97403 USA
[22] Rutherford Appleton Lab, CLRC, Didcot OX11 0QX, Oxon, England
[23] Technion Israel Inst Technol, Dept Phys, IL-32000 Haifa, Israel
[24] Tel Aviv Univ, Dept Phys & Astron, IL-69978 Tel Aviv, Israel
[25] Int Ctr Elementary Particle Phys, Tokyo 1130033, Japan
[26] Univ Tokyo, Dept Phys, Tokyo 1130033, Japan
[27] Kobe Univ, Kobe, Hyogo 6578501, Japan
[28] Brunel Univ, Inst Phys & Environm Sci, Uxbridge UB8 3PH, Middx, England
[29] Weizmann Inst Sci, Particle Phys Dept, IL-76100 Rehovot, Israel
[30] Univ Hamburg, DESY, Inst Expt Phys 2, D-22607 Hamburg, Germany
[31] Univ Victoria, Dept Phys, Victoria, BC V8W 3P6, Canada
[32] Univ British Columbia, Dept Phys, Vancouver, BC V6T 1Z1, Canada
[33] Univ Alberta, Dept Phys, Edmonton, AB T6G 2J1, Canada
[34] Duke Univ, Dept Phys, Durham, NC 27708 USA
[35] Res Inst Particle & Nucl Phys, H-1525 Budapest, Hungary
[36] Inst Nucl Res, H-4001 Debrecen, Hungary
[37] Univ Munich, Sekt Phys, D-85748 Garching, Germany
[38] TRIUMF, Vancouver, BC V6T 2A3, Canada
[39] Lajos Kossuth Univ, Dept Expt Phys, Debrecen, Hungary
[40] Stanislaw Staszic Univ Min & Met, PL-30059 Krakow, Poland
来源
EUROPEAN PHYSICAL JOURNAL C | 1999年 / 11卷 / 03期
关键词
D O I
10.1007/s100520050644
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
The structure of both quasi-real and highly virtual photons is investigated using the reaction e(+)e(-) --> e(+)e(-) mu(+)mu(-), proceeding via the exchange of two photons. The results are based on the complete OPAL dataset taken at e(+)e(-) centre-of-mass energies close to the mass of the Z boson. The QED structure function F(2)(gamma) and the differential cross-section d sigma/dx for quasi-real photons are obtained as functions of the fractional momentum x from the muon momentum which is carried by the struck muon in the quasi-real photon for Values of Q(2) ranging from 1.5 to 400 GeV(2). The differential cross-section d sigma/dx for highly virtual photons is measured for 1.5 < Q(2) < 30 GeV(2) and 1.5 < P(2) < 20 GeV(2), where Q(2) and P(2) are the negative values of the four-momentum squared of the two photons such that Q(2) > P(2). Based on azimuthal correlations the QED structure functions F(A)(gamma) and F(B)(gamma) for quasi-real photons are determined for an average Q(2) of 5.4 GeV(2).
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页码:409 / 425
页数:17
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