Rapidity gaps between jets in photoproduction at HERA

被引：76

作者：

Derrick, M

Krakauer, D

Magill, S

Mikunas, D

Musgrave, B

Repond, J

Stanek, R

Talaga, RL

Zhang, H

Bari, G

Basile, M

Bellagamba, L

Boscherini, D

Bruni, A

Bruni, G

Bruni, P

Romeo, GC

Castellini, G

Chiarini, M

Cifarelli, L

Cindolo, F

Contin, A

Corradi, M

Gialas, I

Giusti, P

Iacobucci, G

Laurenti, G

Levi, G

Margotti, A

Massam, T

Nania, R

Nemoz, C

Palmonari, F

Polini, A

Sartorelli, G

Timellini, R

Garcia, YZ

Zichichi, A

Bornheim, A

Crittenden, J

Desch, K

Diekmann, B

Doeker, T

Eckert, M

Feld, L

Frey, A

Geerts, M

Grothe, M

Hartmann, H

Heinloth, K

机构：

[1] UNIV BOLOGNA, BOLOGNA, ITALY

[2] IST NAZL FIS NUCL, BOLOGNA, ITALY

[3] UNIV BONN, INST PHYS, W-5300 BONN, GERMANY

[4] UNIV BRISTOL, HH WILLS PHYS LAB, BRISTOL BS8 1TL, AVON, ENGLAND

[5] BROOKHAVEN NATL LAB, LONG ISLAND, NY USA

[6] UNIV CALABRIA, DEPT PHYS, I-87036 COSENZA, ITALY

[7] IST NAZL FIS NUCL, COSENZA, ITALY

[8] COLUMBIA UNIV, NEVIS LABS, IRVINGTON, NY USA

[9] INST NUCL PHYS, KRAKOW, POLAND

[10] ACAD MIN & MET, FAC PHYS & NUCL TECHNIQUES, KRAKOW, POLAND

[11] JAGIELLONIAN UNIV, DEPT PHYS, KRAKOW, POLAND

[12] DEUTSCH ELEKTRONEN SYNCHOTRON DESY, HAMBURG, GERMANY

[13] DESY ZEUTHEN, INST HOCHENERGIEPHYS, ZEUTHEN, GERMANY

[14] UNIV FLORENCE, FLORENCE, ITALY

[15] IST NAZL FIS NUCL, I-50125 FLORENCE, ITALY

[16] IST NAZL FIS NUCL, LAB NAZL FRASCATI, I-00044 FRASCATI, ITALY

[17] UNIV FREIBURG, FAK PHYS, W-7800 FREIBURG, GERMANY

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

[19] UNIV HAMBURG, INST EXPTL PHYS 1, HAMBURG, GERMANY

[20] UNIV HAMBURG, INST EXPTL PHYS 2, W-2000 HAMBURG, GERMANY

[21] UNIV LONDON IMPERIAL COLL SCI TECHNOL & MED, HIGH ENERGY NUCL PHYS GRP, LONDON, ENGLAND

[22] UNIV IOWA, DEPT PHYS & ASTRON, IOWA CITY, IA 52242 USA

[23] FORSCHUNGSZENTRUM JULICH, FORSCHUNGSZENTRUM, INST KERNPHYS, W-5170 JULICH, GERMANY

[24] KOREA UNIV, SEOUL 136701, SOUTH KOREA

[25] LOUISIANA STATE UNIV, DEPT PHYS & ASTRON, BATON ROUGE, LA 70803 USA

[26] UNIV AUTONOMA MADRID, DEPT FIS TEOR, MADRID, SPAIN

[27] UNIV MANITOBA, DEPT PHYS, WINNIPEG, MB R3T 2N2, CANADA

[28] MCGILL UNIV, DEPT PHYS, MONTREAL, PQ, CANADA

[29] MOSCOW MV LOMONOSOV STATE UNIV, INST NUCL PHYS, MOSCOW, RUSSIA

[30] NIKHEF H, AMSTERDAM, NETHERLANDS

[31] UNIV AMSTERDAM, AMSTERDAM, NETHERLANDS

[32] OHIO STATE UNIV, DEPT PHYS, COLUMBUS, OH 43210 USA

[33] UNIV OXFORD, DEPT PHYS, OXFORD, ENGLAND

[34] UNIV PADUA, DIPARTIMENTO FIS, PADUA, ITALY

[35] IST NAZL FIS NUCL, PADUA, ITALY

[36] PENN STATE UNIV, DEPT PHYS, UNIVERSITY PK, PA 16802 USA

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

[38] IST NAZL FIS NUCL, ROME, ITALY

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

[40] UNIV CALIF SANTA CRUZ, SANTA CRUZ, CA 95064 USA

[41] UNIV GESAMTHSCH SIEGEN, FACHBEREICH PHYS, W-5900 SIEGEN, GERMANY

[42] TEL AVIV UNIV, SCH PHYS, IL-69978 TEL AVIV, ISRAEL

[43] UNIV TOKYO, INST NUCL STUDY, TOKYO, JAPAN

[44] TOKYO METROPOLITAN UNIV, DEPT PHYS, TOKYO, JAPAN

[45] UNIV TURIN, DIPARTIMENTO FIS SPERIMENTALE, TURIN, ITALY

[46] IST NAZL FIS NUCL, I-10125 TURIN, ITALY

[47] TORINO UNIV, FAC SCI 2, ALESSANDRIA, ITALY

[48] IST NAZL FIS NUCL, ALESSANDRIA, ITALY

[49] UNIV TORONTO, DEPT PHYS, TORONTO, ON, CANADA

[50] UCL, DEPT PHYS & ASTRON, LONDON, ENGLAND

来源：

PHYSICS LETTERS B | 1996年 / 369卷 / 01期

基金：

美国国家科学基金会; 加拿大自然科学与工程研究理事会;

关键词：

D O I：

10.1016/0370-2693(95)01588-4

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Photoproduction events which have two or more jets have been studied in the W-gamma P range 135 GeV < W-gamma P < 280 GeV with the ZEUS detector at HERA, A class of events is observed with little hadronic activity between the jets, The jets are separated by pseudorapidity intervals (Delta eta) Of up to four units and have transverse energies greater than 6 GeV. A gap is defined as the absence between the jets of particles with transverse energy greater than 300 MeV. The fraction of events containing a gap is measured as a function of Delta eta. It decreases exponentially as expected for processes in which colour is exchanged between the jets, up to a value of Delta eta similar to 3, then reaches a constant value of about 0.1. The excess above the exponential fall-off can be interpreted as evidence for hard diffractive scattering via a strongly interacting colour singlet object.

引用

页码：55 / 68

页数：14

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