PHOTOPRODUCTION OF J/PSI MESONS AT HERA

被引：48

作者：

AHMED, T ^{[3
]}

AID, S

ANDREEV, V

ANDRIEU, B

APPUHN, RD

ARPAGAUS, M

BABAEV, A

BAEHR, J

BAN, J

BARANOV, P

BARRELET, E

BARTEL, W

BARTH, M

BASSLER, U

BECK, HP

BEHREND, HJ

BELOUSOV, A

BERGER, C

BERGSTEIN, H

BERNARDI, G

BERNET, R

BERTRANDCOREMANS, G

BESANCON, M

BEYER, R

BIDDULPH, P

BIZOT, JC

BLOBEL, V

BORRAS, K

BOTTERWECK, F

BOUDRY, V

BRAEMER, A

BRASSE, F

BRAUNSCHWEIG, W

BRISSON, V

BRUNCKO, D

BRUNE, C

BUCHHOLZ, R

BUNGENER, L

BURGER, J

BUSSER, FW

BUNIATIAN, A

BURKE, S

BUSCHHORN, G

CAMPBELL, AJ

CARLI, T

CHARLES, F

CLARKE, D

CLEGG, AB

COLOMBO, M

CONTRERAS, JG

机构：

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

[2] VUB,ULB,INTER UNIV INST HIGH ENERGIES,BRUSSELS,BELGIUM

[3] RHEIN WESTFAL TH AACHEN,INST PHYS 3,W-5100 AACHEN,GERMANY

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

[5] INST NUCL PHYS,PL-31342 KRAKOW,POLAND

[6] UNIV DORTMUND,INST PHYS,W-4600 DORTMUND 50,GERMANY

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

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

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

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

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

[12] DESY,W-2000 HAMBURG 52,GERMANY

[13] UNIV HEIDELBERG,INST HOCHENERGIEPHYS,W-6900 HEIDELBERG,GERMANY

[14] CHRISTIAN ALBRECHTS UNIV KIEL,INST REINE & ANGEW KERNPHYS,W-2300 KIEL 1,GERMANY

[15] SLOVAK ACAD SCI,INST EXPTL PHYS,KOSICE,SLOVAKIA

[16] LUND UNIV,DEPT PHYS,S-22101 LUND,SWEDEN

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

[18] ECOLE POLYTECH,F-91128 PALAISEAU,FRANCE

[19] SWISS FED INST TECHNOL,INST TEILCHENPHYS,CH-8006 ZURICH,SWITZERLAND

[20] UNIV ZURICH,INST PHYS,CH-8006 ZURICH,SWITZERLAND

[21] UNIV HAMBURG,INST EXPTL PHYS 1,W-2000 HAMBURG 13,GERMANY

[22] UNIV HAMBURG,INST EXPTL PHYS,W-2000 HAMBURG 13,GERMANY

[23] UNIV HEIDELBERG,INST PHYS,W-6900 HEIDELBERG,GERMANY

[24] QUEEN MARY & WESTFIELD COLL,LONDON,ENGLAND

[25] UNIV LANCASTER,SCH PHYS & MAT,LANCASTER LA1 4YL,ENGLAND

[26] UNIV LIVERPOOL,DEPT PHYS,LIVERPOOL L69 3BX,ENGLAND

[27] MOSCOW THEORET & EXPTL PHYS INST,MOSCOW,RUSSIA

[28] LEBEDEV PHYS INST,MOSCOW,RUSSIA

[29] UNIV LIVERPOOL,DEPT PHYS,LIVERPOOL L69 3BX,ENGLAND

[30] UNIV AIX MARSEILLE 2,IN2P3,CNRS,CPPM,F-13007 MARSEILLE,FRANCE

[31] MAX PLANCK INST PHYS & ASTROPHYS,MUNICH,GERMANY

[32] UNIV PARIS 07,IN2P3,CNRS,CPPM,F-75221 PARIS 05,FRANCE

[33] UNIV PARIS 07,IN2P3,CNRS,F-75221 PARIS 05,FRANCE

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

[35] UNIV PARIS 06,LPNHE,F-75005 PARIS,FRANCE

[36] CZECHOSLOVAK ACAD SCI,CS-11142 PRAGUE 1,CZECH REPUBLIC

[37] UNIV ZURICH,INST PHYS,CH-8006 ZURICH,SWITZERLAND

[38] STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,INST PHYS,STANFORD,CA 94305

[39] UNIV ROMA LA SAPIENZA,DIPARTIMENTO FIS,I-00185 ROME,ITALY

[40] CHARLES UNIV,CTR NUCL,PRAGUE,CZECH REPUBLIC

[41] INFN ROMA,ROME,ITALY

[42] PAUL SCHERRER INST,VILLIGEN,SWITZERLAND

[43] BERG UNIV GESAMTHSCH WUPPERTAL,FACHBEREICH PHYS,WUPPERTAL,GERMANY

[44] DESY,INST HOCHENERGIEPHYS,ZEUTHEN,GERMANY

[45] CENS,CEA,DSM,DAPHNIA,F-91190 GIF SUR YVETTE,FRANCE

来源：

PHYSICS LETTERS B | 1994年 / 338卷 / 04期

关键词：

D O I：

10.1016/0370-2693(94)90806-0

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present a study of J/psi meson production in collisions of 26.7 GeV electrons with 820 GeV protons, performed with the H1-detector at the HERA collider at DESY. The J/psi mesons are detected via their leptonic decays both to electrons and muons. Requiring exactly two particles in the detector, a cross section of sigma(ep --> J/psiX) = (8.8 +/- 2.2) nb is determined for 30 GeV less-than-or-equal-to W(gammap) less-than-or-equal-to 180 GeV and Q2 less-than-or-similar-to 4 GeV2. Using the flux of quasi-real photons with Q2 less-than-or-similar-to 4 GeV2, a total photoproduction cross section of sigma(gammap --> J/psiX) = (56 +/- 13 +/- 14) nb is derived at an average W(gammap) = 90 GeV. The distribution of the squared momentum transfer t from the proton to the J/psi can be fitted using an exponential exp (-b\t\) elow a \t\ of 0.75 GeV2 yielding a slope parameter of b = (4.7 +/- 1.9) GeV-2.

引用

页码：507 / 518

页数：12

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