Multi-electron production at high transverse momenta in ep collisions at HERA

被引：25

作者：

Aktas, A ^{[1
]}

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

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

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

[4] Univ Antwerp, UIA, B-2020 Antwerp, Belgium

[5] ULB, VUB, Inter Univ Inst High Energies, Brussels, Belgium

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

[7] Inst Phys Nucl, Krakow, Poland

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

[9] Joint Inst Nucl Res, Dubna, Russia

[10] CE Saclay, CEA, DSM, DAPNIA, Gif Sur Yvette, France

[11] DESY, D-2000 Hamburg, Germany

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

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

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

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

[16] Univ Kiel, Inst Expt & Angewandte Phys, D-24098 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] Univ London Queen Mary & Westfield Coll, 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, LPNHE, 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, Fac Math & Phys, Prague, Czech Republic

[33] Univ Roma Tre, Dipartimento Fis, Rome 3, Italy

[34] Paul Scherrer Inst, Villigen, Switzerland

[35] Berg Univ Gesamthsch Wuppertal, Fachbereich Phys, Wuppertal, Germany

[36] Yerevan Phys Inst, Yerevan 375036, Armenia

[37] DESY, Zeuthen, Germany

[38] ETH, Inst Teilchenphys, Zurich, Switzerland

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

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

[41] Univ Gesamthsch Wuppertal, Rechenzentrum, D-5600 Wuppertal, Germany

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

[43] CINVESTAV, Dept Fis, Merida, Yucatan, Mexico

[44] Univ PJ Safarik, Kosice, Slovakia

[45] CERN, Geneva, Switzerland

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

来源：

EUROPEAN PHYSICAL JOURNAL C | 2003年 / 31卷 / 01期

关键词：

D O I：

10.1140/epjc/s2003-01326-x

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：

Multi-electron production is studied at high electron transverse momentum in positron- and electron-proton collisions using the H1 detector at HERA. The data correspond to an integrated luminosity of 115 pb(-1). Di-electron and tri-electron event yields are measured. Cross sections are derived in a restricted phase space region dominated by photon-photon collisions. In general good agreement is found with the Standard Model predictions. However, for electron pair invariant masses above 100 GeV, three di-electron events and three tri-electron events are observed, compared to Standard Model expectations of 0.30 +/- 0.04 and 0.23 +/- 0.04, respectively.

引用

页码：17 / 29

页数：13

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