Elastic and inelastic photoproduction of J/psi mesons at HERA

被引：191

作者：

Aid, S ^{[16
]}

Andreev, V

Andrieu, B

Appuhn, RD

Arpagaus, M

Babaev, A

Bahr, J

Ban, J

Ban, Y

Baranov, P

Barrelet, E

Barschke, R

Bartel, W

Barth, M

Bassler, U

Beck, E

Behrend, HJ

Belousov, A

Berger, C

Bernardi, G

Bernet, R

BertrandCoremans, G

Besancon, M

Beyer, R

Biddulph, P

Bispham, P

Bizot, JC

Blobel, V

Borras, K

Botterweck, F

Boudry, V

Braemer, A

Braunschweig, W

Brisson, V

Bruncko, D

Brune, C

Buchholz, R

Bungener, L

Burger, J

Busser, FW

Buniatian, A

Burke, S

Burton, MJ

Buschhorn, G

Campbell, AJ

Carli, T

Charles, F

Charlet, M

Clarke, D

Clegg, AB

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] HUMBOLDT UNIV BERLIN,INST PHYS,BERLIN,GERMANY

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

[5] VUB,ULB,INTERUNIV INST HIGH ENERGIES,BRUSSELS,BELGIUM

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

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

[8] INST NUCL PHYS,KRAKOW,POLAND

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

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

[11] UNIV DORTMUND,INST PHYS,D-4600 DORTMUND,GERMANY

[12] CE SACLAY,CEA,DSM,DAPNIA,GIF SUR YVETTE,FRANCE

[13] UNIV GLASGOW,DEPT PHYS & ASTRON,GLASGOW,LANARK,SCOTLAND

[14] DESY,D-2000 HAMBURG,GERMANY

[15] UNIV HAMBURG,INST EXPT PHYS 1,HAMBURG,GERMANY

[16] UNIV HAMBURG,INST EXPTL PHYS 2,D-2000 HAMBURG,GERMANY

[17] UNIV HEIDELBERG,INST PHYS,D-6900 HEIDELBERG,GERMANY

[18] UNIV HEIDELBERG,INST HOCHENERGIEPHYS,D-6900 HEIDELBERG,GERMANY

[19] CHRISTIAN ALBRECHTS UNIV KIEL,INST REINE & ANGEW KERNPHYS,D-2300 KIEL,GERMANY

[20] SLOVAK ACAD SCI,INST EXPTL PHYS,KOSICE 04353,SLOVAKIA

[21] UNIV LANCASTER,SCH PHYS & CHEM,LANCASTER,ENGLAND

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

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

[24] LUND UNIV,DEPT PHYS,LUND,SWEDEN

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

[26] UNIV AIX MARSEILLE 2,CPPM,IN2P3,CNRS,MARSEILLE,FRANCE

[27] INST THEORET & EXPTL PHYS,MOSCOW 117259,RUSSIA

[28] PN LEBEDEV PHYS INST,MOSCOW 117924,RUSSIA

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

[30] UNIV PARIS 11,LAL,IN2P3,CNRS,ORSAY,FRANCE

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

[32] UNIV PARIS 06,LPNHE,IN2P3,CNRS,PARIS,FRANCE

[33] UNIV PARIS 07,CNRS,LPNHE,IN2P3,PARIS,FRANCE

[34] ACAD SCI CZECH REPUBL,INST PHYS,PRAGUE,CZECH REPUBLIC

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

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

[37] INFN ROMA,ROME,ITALY

[38] PAUL SCHERRER INST,VILLIGEN,SWITZERLAND

[39] BERG UNIV GESAMTHSCH WUPPERTAL,FACHBEREICH PHYS,D-5600 WUPPERTAL,GERMANY

[40] INST HOCHENERGIEPHYS,DESY,D-1615 ZEUTHEN,GERMANY

[41] ETH,INST TEILCHENPHYS,ZURICH,SWITZERLAND

[42] UNIV ZURICH,INST PHYS,ZURICH,SWITZERLAND

来源：

NUCLEAR PHYSICS B | 1996年 / 472卷 / 1-2期

关键词：

photoproduction; J/psi mesons;

D O I：

10.1016/0550-3213(96)00274-X

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：

Results on J/psi production in ep interactions in the Hi experiment at HERA are presented. The J/psi mesons are produced by almost real photons (Q(2) approximate to 0) and detected via their leptonic decays. The data have been taken in 1994 and correspond to an integrated luminosity of 2.7 pb(-1). The yp cross section for elastic J/psi production is observed to increase strongly with the center of mass energy. The cross section for diffractive J/psi production with proton dissociation is found to be of similar magnitude as the elastic cross section. Distributions of transverse momentum and decay angle are studied and found to be in accord with a diffractive production mechanism. For inelastic J/psi production the total yp cross section, the distribution of transverse momenta, and the elasticity of the J/psi are compared to NLO QCD calculations in a colour singlet model and agreement is found. Diffractive psi' production has been observed and a first estimate of the ratio to J/psi production in the HERA energy regime is given.

引用

页码：3 / 31

页数：29

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