Measurement of dijet production in neutral current deep inelastic scattering at high Q2 and determination of αs

被引：49

作者：

Breitweg, J

Chekanov, S

Derrick, M

Krakauer, D

Magill, S

Musgrave, B

Pellegrino, A

Repond, J

Stanek, R

Yoshida, R

Mattingly, MCK

Antonioli, P

Bari, G

Basile, M

Bellagamba, L

Boscherini, D

Bruni, A

Bruni, G

Romeo, GC

Cifarelli, L

Cindolo, F

Contin, A

Corradi, M

De Pasquale, S

Giusti, P

Iacobucci, G

Levi, G

Margotti, A

Massam, T

Nania, R

Palmonari, F

Pesci, A

Sartorelli, G

Zichichi, A

Aghuzumtsyan, G

Amelung, C

Brock, I

Coböken, K

Goers, S

Hartmann, H

Heinloth, K

Hilger, E

Irrgang, P

Jakob, HP

Kappes, A

Katz, UF

Kerger, R

Kind, O

Paul, E

Rautenberg, J

机构：

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

[2] Andrews Univ, Berrien Springs, MI 49104 USA

[3] Univ Bologna, Bologna, Italy

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

[5] Univ Bonn, Inst Phys, D-5300 Bonn, Germany

[6] Univ Bristol, HH Wills Phys Lab, Bristol BS8 1TL, Avon, England

[7] Univ Calabria, Dept Phys, Cosenza, Italy

[8] Ist Nazl Fis Nucl, Cosenza, Italy

[9] Chonnam Natl Univ, Kwangju, South Korea

[10] Columbia Univ, Nevis Labs, Irvington, NY USA

[11] Inst Phys Nucl, Krakow, Poland

[12] Acad Min & Med, Fac Phys & Nucl Tech, Krakow, Poland

[13] Jagiellonian Univ, Dept Phys, Krakow, Poland

[14] DESY, Deutsch Elektronen Synchrotron, Hamburg, Germany

[15] DESY, Zeuthen, Germany

[16] Univ Florence, Florence, Italy

[17] Ist Nazl Fis Nucl, Florence, Italy

[18] Univ Freiburg, Fak Phys, Freiburg, Germany

[19] Univ Glasgow, Dept Phys & Astron, Glasgow, Lanark, Scotland

[20] Univ Hamburg, Inst Expt Phys 1, Hamburg, Germany

[21] Univ Hamburg, Inst Expt Phys 2, Hamburg, Germany

[22] Univ London Imperial Coll Sci Technol & Med, High Energy Nucl Phys Grp, London, England

[23] Forschungszentrum Julich, Inst Kernphys, Julich, Germany

[24] KEK, Inst Particle & Nucl Studies, Tsukuba, Ibaraki, Japan

[25] Minist Educ & Sci Kazakhstan, Inst Phys & Technol, Alma Ata, Kazakhstan

[26] Korea Univ, Seoul 136701, South Korea

[27] Kyungpook Natl Univ, Taegu, South Korea

[28] Univ Autonoma Madrid, Dept Fis Teor, Madrid, Spain

[29] McGill Univ, Dept Phys, Montreal, PQ, Canada

[30] Meiji Gakuin Univ, Fac Gen Educ, Yokohama, Kanagawa, Japan

[31] Moscow Phys Engn Inst, Moscow, Russia

[32] Moscow MV Lomonosov State Univ, Inst Nucl Phys, Moscow, Russia

[33] NIKHEF H, NL-1009 DB Amsterdam, Netherlands

[34] Univ Amsterdam, Amsterdam, Netherlands

[35] Ohio State Univ, Dept Phys, Columbus, OH 43210 USA

[36] Univ Oxford, Dept Phys, Oxford, England

[37] Univ Padua, Dipartimento Fis, Padua, Italy

[38] Ist Nazl Fis Nucl, Padua, Italy

[39] Polytech Univ, Sagamihara, Kanagawa, Japan

[40] Univ Roma La Sapienza, Dipartimento Fis, Rome, Italy

[41] Ist Nazl Fis Nucl, Rome, Italy

[42] Rutherford Appleton Lab, Chilton, England

[43] Univ Calif Santa Cruz, Santa Cruz, CA 95064 USA

[44] Seoul Natl Univ, Seoul, South Korea

[45] Univ Siegen, Fachbereich Phys, D-5900 Siegen, Germany

[46] Tel Aviv Univ, Raymond & Beverly Sackler Fac Exact Sci, Sch Phys, IL-69978 Tel Aviv, Israel

[47] Univ Tokyo, Dept Phys, Tokyo, Japan

[48] Tokyo Metropolitan Univ, Dept Phys, Tokyo, Japan

[49] Univ Turin, Dipartimento Fis Sperimentale, Turin, Italy

[50] Ist Nazl Fis Nucl, I-10125 Turin, Italy

来源：

PHYSICS LETTERS B | 2001年 / 507卷 / 1-4期

关键词：

D O I：

10.1016/S0370-2693(01)00421-X

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Dijet production has been studied in neutral current deep inelastic e(+)p scattering for 470 < Q(2) < 20000 GeV2 with the ZEUS detector at HERA using an integrated luminosity of 38.4 pb(-1). Dijet differential cross sections are presented in a kinematic region where both theoretical and experimental uncertainties are small. Next-to-leading-order (NLO) QCD calculations describe the measured differential cross sections well. A QCD analysis of the measured dijet fraction as a function of Q(2) allows both a precise determination of alpha (s)(M-z) and a test of the energy-scale dependence of the strong coupling constant. A detailed analysis provides an improved estimate of the uncertainties of the NLO QCD cross sections arising from the parton distribution functions of the proton. The value of cu,(Mz), as determined from the QCD fit, is alpha (s)(M-z) = 0.1166 +/- 0.0019(stat.)(-0.0033)(+0.0024)(exp.)(-0.0044)(+0.0057)(th.). (C) 2001 Elsevier Science B.V. All rights reserved.

引用

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页码：70 / 88

页数：19

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