Observation of events with an isolated high energy lepton and missing transverse momentum at HERA

被引：70

作者：

Adloff, C ^{[1
]}

Anderson, M

Andreev, V

Andrieu, B

Arkadov, V

Arndt, C

Ayyaz, I

Babaev, A

Bahr, J

Ban, J

Baranov, P

Barrelet, E

Barschke, R

Bartell, W

Bassler, U

Bate, P

Beck, M

Beglarian, A

Behnke, O

Behrend, HJ

Beier, C

Belousov, A

Berger, C

Bernardi, G

Bertrand-Coremans, G

Biddulph, P

Bizot, JC

Boudry, V

Braemer, A

Braunschweig, W

Brisson, V

Brown, DP

Bruckner, W

Bruel, P

Bruncko, D

Burger, J

Busser, FW

Buniatian, A

Burke, S

Buschhorn, G

Calvet, D

Campbell, AJ

Carli, T

Chabert, E

Charlet, M

Clarke, D

Clerbaux, B

Cocks, S

Contreras, JG

Cormack, C

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

[5] Univ Instelling Antwerp, B-2610 Wilrijk, Belgium

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

[7] Inst Nucl Phys, Krakow, Poland

[8] Univ Calif Davis, IIRPA, Davis, CA USA

[9] Univ Calif Davis, Dept Phys, Davis, CA USA

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

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

[12] Univ Glasgow, Dept Phys & Astron, Glasgow, Lanark, Scotland

[13] DESY, D-2000 Hamburg, Germany

[14] Univ Hamburg, Inst Expt Phys 2, D-2000 Hamburg, Germany

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

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

[17] Univ Heidelberg, Inst Hochenergiephys, Heidelberg, Germany

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

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

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

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

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

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

[24] Univ Manchester, Dept Phys & Astron, Manchester, Lancs, England

[25] Univ Aix Marseille 2, IN2P3, CNRS, CPPM, F-13284 Marseille 07, France

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

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

[28] Max Planck Inst Phys, D-80805 Munich, Germany

[29] Univ Paris Sud, CNRS, IN2P3, LAL, Orsay, France

[30] Univ Paris 06, CNRS, IN2P3, LPNHE, Palaiseau, France

[31] Univ Paris 07, CNRS, IN2P3, LPNHE, Palaiseau, France

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

[33] Charles Univ, Nucl Ctr, Prague, Czech Republic

[34] Univ Roma 3, INFN Roma 1, Rome, Italy

[35] Univ Roma 3, Dipartimento Fis, Rome, Italy

[36] Paul Scherrer Inst, Villigen, Switzerland

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

[38] DESY, Inst Hochenergiephys, Zeuthen, Germany

[39] ETH Zurich, Inst Teilchenphys, Zurich, Switzerland

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

[41] Humboldt Univ, Inst Phys, Berlin, Germany

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

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

来源：

EUROPEAN PHYSICAL JOURNAL C | 1998年 / 5卷 / 04期

关键词：

D O I：

10.1007/s100520050302

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：

A search for events with an imbalance in transverse momentum and with isolated high energy leptons has been carried out at the positron-proton collider HERA. One e(v)ent with and e(-) and five events with a mu(+/-) are found together with evidence for undetected particles carrying transverse momentum. Within the Standard Model the dominant origin of events with this kind of topology is the production of W bosons with subsequent leptonic decay. Three of the six events are within measurement errors found in a region of phase space likely to be populated by this process, while the remaining events show kinematic properties which are atypical of all Standard Model processes considered.

引用

页码：575 / 584

页数：10

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