Inclusive dijet production at low Bjorken-x in deep inelastic scattering

被引：31

作者：

Aktas, A

Andreev, V

Anthonis, T

Asmone, A

Babaev, A

Backovic, S

Bähr, J

Baranov, P

Barrelet, E

Bartel, W

Baumgartner, S

Becker, J

Beckingham, M

Behnke, O

Behrendt, O

Belousov, A

Berger, C

Berndt, T

Bizot, JC

Böhme, J

Boenig, MO

Boudry, V

Bracinik, J

Braunschweig, W

Brisson, V

Bröker, HB

Brown, DP

Bruncko, D

Büsser, FW

Bunyatyan, A

Buschhorn, G

Bystritskaya, L

Campbell, AJ

Caron, S

Cassol-Brunner, F

Chekelian, V

Clarke, D

Collard, C

Contreras, JG

Coppens, YR

Coughlan, JA

Cousinou, MC

Cox, BE

Cozzika, G

Cvach, J

Dainton, JB

Dau, WD

Daum, K

Delcourt, B

Delerue, N

机构：

[1] DESY, D-2000 Hamburg, Germany

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

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

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

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

[6] Univ Antwerpen UIA, Antwerp, Belgium

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

[8] Inst Nucl Phys, Krakow, Poland

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

[10] Joint Inst Nucl Res, Dubna, Russia

[11] Ctr Etud Saclay, CEA, DSM, DAPNIA, F-91191 Gif Sur Yvette, France

[12] Univ Hamburg, Inst Expt Phys, Hamburg, Germany

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

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

[15] Heidelberg Univ, Kirchhoff Inst Phys, D-6900 Heidelberg, Germany

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

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

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

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

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

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

[22] Univ Manchester, Dept Phys, Manchester M13 9PL, Lancs, England

[23] Univ Mediterranee, CNRS, IN2P3, CPPM, Marseille, France

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

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

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

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

[28] Ecole Polytech, CNRS, IN2P3, LPNHE, F-91128 Palaiseau, France

[29] Univ Paris 06, LPNHE, Paris, France

[30] Univ Paris 07, IN2P3, CNRS, Paris, France

[31] Acad Sci Czech Republ, Inst Phys, Prague, Czech Republic

[32] Charles Univ Prague, Fac Math & Phys, Prague, Czech Republic

[33] Univ Roma Tre, Dipartimento Fis, Rome, Italy

[34] INFN Roma 3, Rome, Italy

[35] Paul Scherrer Inst, Villigen, Switzerland

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

[37] Yerevan Phys Inst, Yerevan 375036, Armenia

[38] DESY, Zeuthen, Germany

[39] ETH, Inst Teilchenphys, Zurich, Switzerland

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

[41] Natl Tech Univ Athens, Dept Phys, GR-15773 Athens, Greece

[42] Berg Univ Wuppertal, Rechzentrum, D-42097 Wuppertal, Germany

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

[44] CINVESTAV, Dept Fis Aplicada, Merida, Yucatan, Mexico

[45] Safarik Univ, Kosice, Slovakia

[46] CERN, Geneva, Switzerland

[47] CINVESTAV, Dept Fis, Mexico City 14000, DF, Mexico

来源：

EUROPEAN PHYSICAL JOURNAL C | 2004年 / 33卷 / 04期

关键词：

D O I：

10.1140/epjc/s2004-01644-5

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：

Dijet production in deep inelastic ep scattering is investigated in the region of low values of the Bjorken-variable x (10(-4) < x < 10(-2)) and low photon virtualities Q(2) (5 < Q(2) < 100 GeV2). The measured dijet cross sections are compared with perturbative QCD calculations in next-to-leading order. For most dijet variables studied, these calculations can provide a reasonable description of the data over the full phase space region covered, including the region of very low x. However, large discrepancies at low x and low Q(2) are observed for events with small separation in azimuth between the two highest transverse momentum jets. This region of phase space is described better by predictions based on the CCFM evolution equation, which incorporates k(t) factorized unintegrated parton distributions. A reasonable description can be also obtained using the Color Dipole Model or models incorporating virtual photon structure.

引用

页码：477 / 493

页数：17

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