UvA-DARE ( Digital Academic Repository ) Rapidity gaps between jets in photoproduction at HERA-猫眼课题宝

UvA-DARE（数字学术存储库）HERA 摄影制作中喷气机之间的速度差距

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2003

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L. Adamczyk;B. Bednarek;K. Jeleń;D. Kisielewska;T. Kowalski;M. Przybycied;E. Rulikowska;L. Suszycki;J. Zaja̧c;H. Beier;J. Bienlein;C. Coldewey;K. Desler;D. Gilkinson;C. Glasman;P. Giittlicher;J. Grobe;B. Gutj;D. Hasell;H. Helling;Y. Iga;K. Johnson;P. Joos;M. Kasemann;R. Klanner;W. Koch;L. Kiipke;H. Kowalski;B. Liihr;M. Lowe;D. Luke;J. Mainusch;T. Monteiro;J. Ng;S. Nickel;Notz;K. Ohrenberg;M. Roco;M. Rohde;J. Roldan;U. Schneekloth;W. Schulz;F. Selonke;E. Stiliaris;B. Surrow;D. Westphal;G. Wolf;C. Youngman;W. Zeuner;J. F. Zhou;A. Leich;Sm;Mari;K. M.;Mattingly;A. Meyer;S. Schlenstedt;G. Maccarrone;S. Pasquale;L. Votano;A. Freidhof;J. Schroeder;T. Trefzger;M. Utley;E. Baduraz;B. Burow;L. Hagge;Lohrmann;J. Milewski;M. Nakahata;A. Whitfield

用HERA的ZEUS探测器在135 GeV < 280 GeV的W_i范围内研究了具有两个或多个喷流的光生事件。一类事件被观察到的喷注之间的强子活动很少。喷流被高达四个单位的赝快度间隔（Ar]）分开，并且具有大于6 GeV的横向能量。间隙被定义为横向能量大于300 MeV的粒子射流之间的不存在。包含间隙的事件的分数被测量为AT的函数。如对于在射流之间交换颜色的过程所预期的，它呈指数下降，直到AT 3的值，然后达到约0.1的恒定值。指数衰减以上的过量可以解释为通过强烈相互作用的颜色单态物体的硬衍射散射的证据。也是在意大利的IROE佛罗伦萨。* 现在在萨莱诺大学和意大利那不勒斯INFN。3由欧盟HCM合同ERB-CHRX-CT 93 -0376支持。4由瑞士洛桑世界实验室支持。5现在是一名自雇顾问。6现在在波恩的ELEKLUFT。现在也在都灵大学。* 亚历山大冯洪堡研究员。g阿尔弗雷德·斯隆基金会研究员。lo现在在Jagellonian大学计算机科学学院，克拉科夫l1现在在波恩的Comma-Soft。* 来自佛罗里达州立大学的访客。现在在美因茨大学。I4现在在DESY计算机中心。I5由欧洲共同体PRAXIS XXI方案支助。16现就职于法兰克福/M的赛德尔信息系统博士。“现在在雅典的加速系统和应用研究所（IASA）。18现在在慕尼黑的美世管理咨询公司工作。lg现在在斯特拉斯堡大学。“现在在安德鲁斯大学，巴瑞恩斯普林斯，美国。* “现在与弗赖堡大学物理系的OPAL合作。** 现就职于海德堡SAS-Institut GmbH。现在在GSI达姆施塔特。24也得到国家能源和环境研究中心的支持。Z现在在东京大学宇宙射线研究所工作。26部分由CAM支持。“部分由DESY支持。28现在在荷兰埃因霍温的飞利浦Natlab。2 g现于加拿大渥太华卡尔顿大学。现在在华盛顿能源部工作。31现在在HEP部门，阿贡国家实验室，阿贡，IL. 32现在在Oxford Magnet Technology，Eynsham，Oxon。[33]部分得到了阿贡国家实验室的支持。34由MINERVA研究金支助。35目前在加拿大阿尔伯塔大学亚原子研究中心和加拿大温哥华的TRIUMF。36由波兰国家科学研究委员会支助，批准号：2 P03 B 09308。37由波兰国家科学研究委员会支持，资助号：2 P03 B 09208。38现在美国科罗拉多大学。3g Now at High Energy Group of州立大学of纽约，60 ZEUS Collaboration/Physics Letters B 369（1996）55-68

Photoproduction events which have two or more jets have been studied in the W,, range 135 GeV < W,, < 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 (Ar]) 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 AT. It decreases exponentially as expected for processes in which colour is exchanged between the jets, up to a value of AT 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. ’ Also at IROE Florence, Italy. * Now at Univ. of Salerno and INFN Napoli, Italy. 3 Supported by EU HCM contract ERB-CHRX-CT93-0376. 4 Supported by Worldlab, Lausanne, Switzerland. 5 Now a self-employed consultant. 6 Now at ELEKLUFT, Bonn. ’ Now also at University of Torino. * Alexander von Humboldt Fellow. g Alfred P. Sloan Foundation Fellow. lo Now at Inst. of Computer Science, Jagellonian Univ., Cracow. l1 Now at Comma-Soft, Bonn. ‘* Visitor from Florida State University. I3 Now at Univ. of Mainz. I4 Now at DESY Computer Center. I5 Supported by European Community Program PRAXIS XXI. l6 Now at Dr. Seidel Informationssysteme, Frankfurt/M. ” Now at Inst. of Accelerating Systems & Applications (IASA), Athens. l8 Now at Mercer Management Consulting, Munich. lg Now at Univ. de Strasbourg. ” Now at Andrews University, Barrien Springs, USA. *’ Now with OPAL Collaboration, Faculty of Physics at Univ. of Freiburg. ** Now at SAS-Institut GmbH, Heidelberg. u Now at GSI Darmstadt. 24 Also supported by NSERC. Z Now at Institute for Cosmic Ray Research, University of Tokyo. 26 Partially supported by CAM. ” Partially supported by DESY. 28 Now at Philips Natlab, Eindhoven, NL. 2g Now at Carleton University, Ottawa, Canada. 3o Now at Department of Energy, Washington. 31 Now at HEP Div., Argonne National Lab., Argonne, IL, USA. 32 Now at Oxford Magnet Technology, Eynsham, Oxon. 33 In part supported by Argonne National Laboratory. 34 Supported by a MINERVA Fellowship. 35 Now at Centre for Subatomic Research, Univ.of Alberta, Canada and TRIUMF, Vancouver, Canada. 36 Supported by the Polish State Committee for Scientific Research, grant No. 2P03B09308. 37 Supported by the Polish State Committee for Scientific Research, grant No. 2P03B09208. 38 Now at University of Colorado, USA. 3g Now at High Energy Group of State University of New York, 60 ZEUS Collaboration/Physics Letters B 369 (1996) 55-68

UvA-DARE ( Digital Academic Repository ) Rapidity gaps between jets in photoproduction at HERA

UvA-DARE（数字学术存储库）HERA 摄影制作中喷气机之间的速度差距

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