Isolated electrons and muons in events with missing transverse momentum at HERA

被引：51

作者：

Andreev, V

Andrieu, B

Anthonis, T

Astvatsatourov, A

Babaev, A

Bähr, J

Baranov, P

Barrelet, E

Bartel, W

Baumgartner, S

Becker, J

Beckingham, M

Beglarian, A

Behnke, O

Belousov, A

Berger, C

Berndt, T

Bizot, JC

Böhme, J

Boudry, V

Bracinik, J

Braunschweig, W

Brisson, V

Bröker, HB

Brown, DP

Bruncko, D

Büsser, FW

Bunyatyan, A

Burrage, 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

Davidsson, M

Delcourt, B

Delerue, N

机构：

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

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

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

[4] Univ Manchester, Dept Phys, Manchester, Lancs, England

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

[6] Univ London Queen Mary & Westfield Coll, London E1 4NS, England

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

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

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

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

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

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

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

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

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

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

[17] INFN Roma 3, Rome, Italy

[18] Paul Scherrer Inst, Villigen, Switzerland

[19] Berg Univ Gesamthsch Wuppertal, Fachbereich Phys, D-5600 Wuppertal, Germany

[20] Yerevan Phys Inst, Yerevan 375036, Armenia

[21] DESY, Zeuthen, Germany

[22] ETH, Inst Teilchenphys, Zurich, Switzerland

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

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

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

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

[27] Univ Instelling Antwerp, Antwerp, Belgium

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

[29] Rutherford Appleton Lab, Chilton, England

[30] Inst Phys Nucl, Krakow, Poland

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

[32] Joint Nucl Res Inst, Dubna, Russia

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

[34] DESY, D-2000 Hamburg, Germany

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

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

[37] Univ Heidelberg, Inst Phys, Heidelberg, Germany

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

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

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

[41] Berg Univ Gesamthsch Wuppertal, Rechenzentrum, Wuppertal, Germany

[42] CERN, Geneva, Switzerland

[43] Univ Karlsruhe, Inst Expt Kernphys, Karlsruhe, Germany

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

[45] Safarik Univ, Kosice, Slovakia

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

来源：

PHYSICS LETTERS B | 2003年 / 561卷 / 3-4期

关键词：

D O I：

10.1016/S0370-2693(03)00497-0

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

A search for events with a high-energy isolated electron or muon and missing transverse momentum has been performed at the electron-proton collider HERA using an integrated luminosity of 13.6 pb(-1) in e(-) p scattering and 104.7 pb(-1) in e(+) p scattering. Within the Standard Model such events are expected to be mainly due to W boson production with subsequent leptonic decay. In e(-) p interactions one event is observed in the electron channel and none in the muon channel, consistent with the expectation of the Standard Model. In the e(+) p data a total of 18 events are seen in the electron and muon channels compared to an expectation of 12.4 +/- 1.7 dominated by W production (9.4 +/- 1.6). Whilst the overall observed number of events is broadly in agreement with the number predicted by the Standard Model, there is-an excess of events with transverse momentum of the hadronic system greater than 25 GeV with 10 events found compared to 2.9 +/- 0.5 expected. The results are used to determine the cross-section for events with an isolated electron or muon and missing transverse momentum. (C) 2003 Published by Elsevier Science B.V.

引用

页码：241 / 257

页数：17

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