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

被引：14

作者：

Aaron, F. D. ^{[1
,41
]}

Alexa, C. ^{[1
]}

Andreev, V. ^{[22
]}

Antunovic, B.

Aplin, S.

Asmone, A. ^{[31
,32
]}

Astvatsatourov, A. ^{[5
,6
]}

Bacchetta, A.

Backovic, S. ^{[28
]}

Baghdasaryan, A. ^{[37
]}

Baranov, P. ^{[22
]}

Barrelet, E. ^{[26
,27
]}

Bartel, W.

Beckingham, M.

Begzsuren, K. ^{[34
,48
]}

Behnke, O. ^{[11
]}

Belousov, A. ^{[22
]}

Berger, N. ^{[39
]}

Bizot, J. C. ^{[24
]}

Boenig, M. -O.

Boudry, V. ^{[25
]}

Bozovic-Jelisavcic, I. ^{[3
]}

Bracinik, J. ^{[4
]}

Brandt, G.

Brinkmann, M.

Brisson, V. ^{[24
]}

Bruncko, D. ^{[13
]}

Bunyatyan, A. ^{[10
]}

Buschhorn, G. ^{[23
]}

Bystritskaya, L. ^{[21
]}

Campbell, A. J.

Avila, K. B. Cantun ^{[19
]}

Cassol-Brunner, F. ^{[18
]}

Cerny, K. ^{[30
]}

Cerny, V. ^{[13
,42
]}

Chekelian, V. ^{[23
]}

Cholewa, A.

Contreras, J. G. ^{[19
]}

Coughlan, J. A. ^{[7
]}

Cozzika, G.

Cvach, J. ^{[29
]}

Dainton, J. B. ^{[15
]}

Daum, K. ^{[36
,43
]}

Deak, M.

de Boer, Y.

Delcourt, B. ^{[24
]}

Del Degan, M. ^{[39
]}

Delvax, J. ^{[5
,6
]}

De Roeck, A. ^{[44
]}

De Wolf, E. A. ^{[5
,6
]}

机构：

[1] NIPNE, Bucharest, Romania

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

[3] Vinca Inst Nucl Sci, Belgrade, Serbia

[4] Univ Birmingham, Sch Phys & Astron, Birmingham, W Midlands, England

[5] Univ Antwerp, Antwerp, Belgium

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

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

[8] Inst Nucl Phys, Krakow, Poland

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

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

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

[12] Heidelberg Univ, Kirchhoff Inst Phys, Heidelberg, Germany

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

[14] Univ Lancaster, Dept Phys, Lancaster, England

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

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

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

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

[19] CINVESTAV, Dept Fis Aplicada, Merida, Yucaton, Mexico

[20] CINVESTAV, Dept Fis, Mexico City, DF, Mexico

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

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

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

[24] Univ Paris 11, CNRS, IN2P3, LAL, F-91405 Orsay, France

[25] Ecole Polytech, CNRS, IN2P3, LLR, F-91128 Palaiseau, France

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

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

[28] Univ Montenegro, Fac Sci, Podgorica, Montenegro

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

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

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

[32] INFN Roma 3, Rome, Italy

[33] Bulgarian Acad Sci, Inst Nucl Res & Nucl Energy, Sofia, Bulgaria

[34] Mongolian Acad Sci, Inst Phys & Technol, Ulaanbaatar, Mongolia

[35] Paul Scherrer Inst, Villigen, Switzerland

[36] Univ Wuppertal, Fachbereich C, 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] Univ Bucharest, Fac Phys, Bucharest, Romania

[42] Comenius Univ, Bratislava, Slovakia

[43] Univ Wuppertal, Rechenzentrum, Wuppertal, Germany

[44] CERN, Geneva, Switzerland

[45] Safarik Univ, Kosice, Slovakia

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

[47] Ulaanbaatar Univ, Ulaanbaatar, Mongolia

[48] Joint Inst Nucl Res, Dubna, Russia

来源：

PHYSICS LETTERS B | 2008年 / 668卷 / 04期

基金：

英国科学技术设施理事会;

关键词：

D O I：

10.1016/j.physletb.2008.08.057

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Processes leading to a final state with at least two high transverse momentum leptons (electrons or muons) are studied using the full e(+/-) p data sample collected by the H1 experiment at HERA. The data correspond to an integrated luminosity of 463 pb(-1). Di-lepton and tri-lepton event classes are investigated. Cross sections of the production of e(+)e(-) and mu(+)mu(-) pairs are derived in a restricted phase space dominated by photon-photon collisions. In general, good agreement is found with Standard Model predictions. Events are observed with a total scalar sum of lepton transverse momenta above 100 GeV where the Standard Model expectation is low. In this region, combining di-lepton and tri-lepton classes, five events are observed in e(+) p collisions, compared to a Standard Model expectation of 0.96 +/- 0.12, while no such event is observed in e(-) p data for 0.64 +/- 0.09 expected. (C) 2008 Elsevier B.V. All rights reserved.

引用

页码：268 / 276

页数：9

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