Observation of events at very high Q(2) in ep collisions at HERA

被引：236

作者：

Adloff, C

Aid, S

Anderson, M

Andreev, V

Andrieu, B

Arkadov, V

Arndt, C

Ayyaz, I

Babaev, A

Bahr, J

Ban, J

Ban, Y

Baranov, P

Barrelet, E

Barschke, R

Bartel, W

Bassler, U

Beck, HP

Beck, M

Behrend, HJ

Belousov, A

Berger, C

Bernardi, G

BertrandCoremans, G

Beyer, R

Biddulph, P

Bispham, P

Bizot, JC

Borras, K

Botterweck, F

Boudry, V

Bourov, S

Braemer, A

Braunschweig, W

Brisson, V

Bruckner, W

Bruel, P

Bruncko, D

Brune, C

Buchholz, R

Bungener, L

Burger, J

Busser, FW

Buniatian, A

Burke, S

Buschhorn, G

Calvet, D

Campbell, AJ

Carli, T

Charlet, M

机构：

[1] UNIV LANCASTER,SCH PHYS & CHEM,LANCASTER LA1 4YB,ENGLAND

[2] UNIV LIVERPOOL,DEPT PHYS,LIVERPOOL L69 3BX,MERSEYSIDE,ENGLAND

[3] UNIV LONDON QUEEN MARY & WESTFIELD COLL,LONDON E1 4NS,ENGLAND

[4] LUND UNIV,DEPT PHYS,S-22362 LUND,SWEDEN

[5] UNIV MANCHESTER,DEPT PHYS,MANCHESTER M13 9PL,LANCS,ENGLAND

[6] UNIV AIX MARSEILLE 2,IN2P3,CNRS,CPPM,F-13288 MARSEILLE,FRANCE

[7] INST THEORET & EXPT PHYS,RU-117259 MOSCOW,RUSSIA

[8] PN LEBEDEV PHYS INST,RU-117924 MOSCOW,RUSSIA

[9] MAX PLANCK INST PHYS & ASTROPHYS,D-80805 MUNICH,GERMANY

[10] UNIV PARIS 11,IN2P3,CNRS,LAL,F-91405 ORSAY,FRANCE

[11] ECOLE POLYTECH,CNRS,IN2P3,LPNHE,F-91128 PALAISEAU,FRANCE

[12] UNIV PARIS 06,LPNHE,F-75252 PARIS,FRANCE

[13] UNIV PARIS 07,IN2P3,CNRS,F-75252 PARIS,FRANCE

[14] ACAD SCI CZECH REPUBL,INST PHYS,CZ-18040 PRAGUE,CZECH REPUBLIC

[15] CHARLES UNIV,NUCL CTR,CZ-18000 PRAGUE,CZECH REPUBLIC

[16] UNIV ROMA 1,IST NAZL FIS NUCL,I-00146 ROME,ITALY

[17] UNIV ROMA 3,DIPARTIMENTO FIS,I-00146 ROME,ITALY

[18] PAUL SCHERRER INST,CH-5232 VILLIGEN,SWITZERLAND

[19] DESY,INST HOCHENERGIEPHYS,D-15738 ZEUTHEN,GERMANY

[20] ETH ZURICH,INST TEILCHENPHYS,CH-8093 ZURICH,SWITZERLAND

[21] UNIV ZURICH,INST PHYS,CH-8001 ZURICH,SWITZERLAND

[22] HUMBOLDT UNIV BERLIN,INST PHYS,D-10115 BERLIN,GERMANY

[23] BERG UNIV GESAMTHSCH WUPPERTAL,RECHENZENTRUM,D-42097 WUPPERTAL,GERMANY

[24] RHEIN WESTFAL TH AACHEN,INST PHYS 1,D-52074 AACHEN,GERMANY

[25] RHEIN WESTFAL TH AACHEN,INST PHYS 3,D-52074 AACHEN,GERMANY

[26] UNIV BIRMINGHAM,SCH PHYS & SPACE RES,BIRMINGHAM B15 2TT,W MIDLANDS,ENGLAND

[27] UNIV INSTELLING ANTWERP,B-2610 WILRIJK,BELGIUM

[28] FREE UNIV BRUSSELS,VUB,INTERUNIV INST HIGH ENERGIES,BRUSSELS,BELGIUM

[29] RUTHERFORD APPLETON LAB,DIDCOT OX11 0QX,OXON,ENGLAND

[30] INST NUCL PHYS,PL-30055 KRAKOW,POLAND

[31] UNIV CALIF DAVIS,DEPT PHYS,DAVIS,CA 95616

[32] UNIV CALIF DAVIS,IIRPA,DAVIS,CA 95616

[33] UNIV DORTMUND,INST PHYS,D-44227 DORTMUND,GERMANY

[34] CE SACLY,CEA,DAPNIA,DSM,F-91191 GIF SUR YVETTE,FRANCE

[35] UNIV GLASGOW,DEPT PHYS & ASTRON,GLASGOW G12 8QQ,LANARK,SCOTLAND

[36] DESY,D-22603 HAMBURG,GERMANY

[37] UNIV HAMBURG,INST EXPT PHYS 1,D-22761 HAMBURG,GERMANY

[38] UNIV HAMBURG,INST EXPT PHYS 2,D-22761 HAMBURG,GERMANY

[39] MAX PLANCK INST KERNPHYS,D-69029 HEIDELBERG,GERMANY

[40] UNIV HEIDELBERG,INST PHYS,D-69120 HEIDELBERG,GERMANY

[41] UNIV HEIDELBERG,INST HOCHENERGIEPHYS,D-69120 HEIDELBERG,GERMANY

[42] CHRISTIAN ALBRECHTS UNIV KIEL,INST REINE & ANGEW KERNPHYS,D-24118 KIEL,GERMANY

[43] SLOVAK ACAD SCI,INST EXPT PHYS,KOSICE 04353,SLOVAKIA

来源：

ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS | 1997年 / 74卷 / 02期

关键词：

D O I：

10.1007/s002880050383

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：

Measurements of ep scattering with squared 4-momentum transfer Q(2) up to 35000 GeV2 are compared with the expectation of the standard deep-inelastic model of lepton-nucleon scattering (DIS). For Q(2) > 15000 GeV2 N-obs = 12 neutral current candidate events are observed where the expectation is N-DIS = 4.71 +/- 0.76 events. In the same Q(2) range, N-obs = 4 charged current candidates are observed where the expectation is N-DIS = 1.77 +/- 0.87 events. The probability P(N greater than or equal to N-obs) that the DIS model signal N fluctuates to N greater than or equal to N-obs in a random set of experiments is 6 x 10(-3) for neutral current and 0.14, for charged cur rent, The difference in the observed and expected number of Neutral Current events is mostly due to events at large masses M = root xs in which the positron is backscattered at large y = Q(2)/M-2.

引用

页码：191 / 205

页数：15

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