Measurement of dijet production at low Q2 at HERA

被引：21

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

Berger, N

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

Cerny, K

Chekelian, V

Chyla, J

Collard, C

Contreras, JG

Coppens, YR

Coughlan, JA

Cousinou, MC

Cox, BE

Cozzika, G

Cvach, J

Dainton, JB

Dau, WD

Daum, K

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

[6] Univ Antwerp, B-2020 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] CE Saclay, DAPNIA, DSM, CEA, 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, CPPM, CNRS, IN2P3, 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, LAL, CNRS, IN2P3, Orsay, France

[28] Ecole Polytech, LLR, CNRS, IN2P3, Palaiseau, France

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

[30] Univ Paris 07, LPNHE, CNRS, IN2P3, 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, D-42097 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, Rechenzentrum, 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 / 37卷 / 02期

关键词：

D O I：

10.1140/epjc/s2004-01989-7

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：

Triple differential dijet cross sections in e(+/-)p interactions are presented in the region of photon virtualities 2 < Q(2) < 80 GeV2, inelasticities 0.1 < y < 0.85, jet transverse energies E*(T1) > 7GeV, E*(T2) > 5 GeV, and pseudorapidities - 2.5 < eta(1)*, eta(2)* < 0. The measurements are made in the gamma*p centre-of-mass frame, using an integrated luminosity of 57 pb(-1). The data are compared with NLO QCD calculations and LO Monte Carlo programs with and without a resolved virtual photon contribution. NLO QCD calculations fail to describe the region of low Q(2) and low jet transverse energies, in contrast to a LO Monte Carlo generator which includes direct and resolved photon interactions with both transversely and longitudinally polarised photons. Initial and final state parton showers are tested as a mechanism for including higher order QCD effects in low E-T jet production.

引用

页码：141 / 159

页数：19

共 73 条

[41] Probing the parton densities of virtual photons at ep colliders [J].