Measurement of dijet cross-sections in low Q2 ep collisions and the extraction of an effective parton density for the virtual photon

被引：0

作者：

Adloff, C ^{[1
]}

Andreev, V

Andrieu, B

Arkadov, V

Astvatsatourov, A

Ayyaz, I

Babaev, A

Bähr, J

Baranov, P

Barrelet, E

Bartel, T

Bassler, U

Bate, P

Beglarian, A

Behnke, O

Behrend, HJ

Beier, C

Belousov, A

Berger, C

Bernardi, G

Berndt, T

Bertrand-Coremans, G

Biddulph, P

Bizot, JC

Boudry, V

Braunschweig, W

Brisson, V

Brown, DP

Brückner, W

Bruel, P

Bruncko, D

Bürger, J

Büsser, FW

Buniatian, A

Burke, S

Burrage, A

Buschhorn, G

Calvet, D

Campbell, AJ

Carli, T

Chabert, E

Charlet, M

Chyla, J

Clarke, D

Clerbaux, B

Contreras, JG

Cormack, C

Coughlan, JA

Cousinou, MC

Cox, BE

机构：

[1] Berg Univ Wuppertal, Fachbereich Phys, Wuppertal, Germany

[2] DESY, Inst Hochenergiephys, Zeuthen, Germany

[3] Swiss Fed Inst Technol, Inst Teilchenphys, Zurich, Switzerland

[4] Univ Zurich, Inst Phys, Zurich, Switzerland

[5] Humboldt Univ, Inst Phys, Berlin, Germany

[6] Berg Univ Wuppertal, Rech Zentrum, Wuppertal, Germany

[7] Univ Karlsruhe, Inst Expt Kernphys, D-7500 Karlsruhe, Germany

[8] CINVESTAV, Dept Fis Ap, Merida, Yucatan, Mexico

[9] Rhein Westfal TH Aachen, Inst Phys 1, D-5100 Aachen, Germany

[10] Rhein Westfal TH Aachen, Inst Phys 3, D-5100 Aachen, Germany

[11] Univ Birmingham, Sch Phys & Space Res, Birmingham B15 2TT, W Midlands, England

[12] Interuniv Inst High Energies ULB VUB, Brussels, Belgium

[13] Univ Instelling Antwerp, B-2610 Antwerp, Belgium

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

[15] Inst Phys Nucl, Krakow, Poland

[16] Univ Calif Davis, IIRPA, Davis, CA 95616 USA

[17] Univ Calif Davis, Dept Phys, Davis, CA 95616 USA

[18] Univ Dortmund, Inst Phys, D-4600 Dortmund, Germany

[19] Joint Nucl Res Inst, Dubna, Russia

[20] CEA Saclay, DAPNIA, DSM, F-91191 Gif Sur Yvette, France

[21] DESY, D-2000 Hamburg, Germany

[22] Univ Hamburg, Inst Expt Phys 2, D-2000 Hamburg, Germany

[23] Max Planck Inst Kernphys, D-69117 Heidelberg, Germany

[24] Heidelberg Univ, Inst Phys, D-6900 Heidelberg, Germany

[25] Heidelberg Univ, Inst Hochenergiephys, D-6900 Heidelberg, Germany

[26] Univ Kiel, Inst Expt & Angew Phys, Kiel, Germany

[27] Slovak Acad Sci, Inst Expt Phys, Kosice 04353, Slovakia

[28] Univ Lancaster, Sch Phys & Chem, Lancaster, England

[29] Univ Liverpool, Dept Phys, Liverpool L69 3BX, Merseyside, England

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

[31] Lund Univ, Dept Phys, Lund, Sweden

[32] Univ Manchester, Dept Phys & Astron, Manchester, Lancs, England

[33] Univ Aix Marseille 2, IN2P3, CNRS, CPPM, F-13284 Marseille 07, France

[34] Inst Theoret & Expt Phys, Moscow 117259, Russia

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

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

[37] Univ Paris 11, IN2P3, CNRS, LAL, Orsay, France

[38] Ecole Polytech, IN2P3, CNRS, LPNHE, Palaiseau, France

[39] Univ Paris 06, CNRS, IN2P3, LPNHE, Paris, France

[40] Univ Paris 07, CNRS, IN2P3, LPNHE, Paris, France

[41] Acad Sci Czech Republic, Inst Phys, Prague, Czech Republic

[42] Charles Univ Prague, Nucl Ctr, Prague, Czech Republic

[43] Univ Roma 3, Dipartimento Fis, Rome, Italy

[44] Univ Roma 3, INFN Roma 1, Rome, Italy

[45] Paul Scherrer Inst, Villigen, Switzerland

来源：

EUROPEAN PHYSICAL JOURNAL C | 2000年 / 13卷 / 03期

关键词：

D O I：

10.1007/s100520000144

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 triple-differential dijet cross-section, d(3)sigma(ep)/dQ(2)d (E) over bar(t)(2) dx(gamma)(jets), is measured with the H1 detector at HERA as a function of the photon virtuality the fraction of the photon's momentum carried by the parton entering the hard scattering, x(gamma)(jets), and the square of the mean transverse energy, (E) over bar(t)(2), of the two highest E-t jets. Jets are found using a longitudinal boost-invariant k(T) clustering algorithm in the gamma*p center of mass frame. The measurements cover the ranges 1.6 < Q(2) < 80 GeV2 in virtuality and 0.1 < y < 0.7 in inelasticity y. The results are well described by leading order QCD models which include the effects of a resolved component to the virtual photon. Models which treat the photon as point-like fail to describe the data. An effective leading order parton density for the virtual photon is extracted as a function of the photon virtuality, the probing scale and the parton momentum fraction. The a:, and probing scale dependences of the parton density show characteristic features of photon structure, and a suppression of this structure with increasing Q(2) is seen.

引用

页码：397 / 414

页数：18

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