Phys. Rev. Lett.
91,
011802
(2003)
[6 pages]
Central Pseudorapidity Gaps in Events with a Leading Antiproton at the Fermilab Tevatron p̅ p Collider
D. Acosta et al. CDF Collaboration
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D. Acosta14, T. Affolder25, H. Akimoto50, M. G. Albrow13, D. Ambrose37, D. Amidei28, K. Anikeev27, J. Antos1, G. Apollinari13, T. Arisawa50, A. Artikov11, T. Asakawa48, W. Ashmanskas10, F. Azfar35, P. Azzi-Bacchetta36, N. Bacchetta36, H. Bachacou25, W. Badgett13, S. Bailey18, P. de Barbaro41, A. Barbaro-Galtieri25, V. E. Barnes40, B. A. Barnett21, S. Baroiant5, M. Barone15, G. Bauer27, F. Bedeschi38, S. Behari21, S. Belforte47, W. H. Bell17, G. Bellettini38, J. Bellinger51, D. Benjamin12, J. Bensinger4, A. Beretvas13, J. Berryhill10, A. Bhatti42, M. Binkley13, D. Bisello36, M. Bishai13, R. E. Blair2, C. Blocker4, K. Bloom28, B. Blumenfeld21, S. R. Blusk41, A. Bocci42, A. Bodek41, G. Bolla40, A. Bolshov27, Y. Bonushkin6, D. Bortoletto40, J. Boudreau39, A. Brandl31, C. Bromberg29, M. Brozovic12, E. Brubaker25, N. Bruner31, J. Budagov11, H. S. Budd41, K. Burkett18, G. Busetto36, K. L. Byrum2, S. Cabrera12, P. Calafiura25, M. Campbell28, W. Carithers25, J. Carlson28, D. Carlsmith51, W. Caskey5, A. Castro3, D. Cauz47, A. Cerri38, L. Cerrito20, A. W. Chan1, P. S. Chang1, P. T. Chang1, J. Chapman28, C. Chen37, Y. C. Chen1, M.-T. Cheng1, M. Chertok5, G. Chiarelli38, I. Chirikov-Zorin11, G. Chlachidze11, F. Chlebana13, L. Christofek20, M. L. Chu1, J. Y. Chung33, W.-H. Chung51, Y. S. Chung41, C. I. Ciobanu33, A. G. Clark16, M. Coca41, A. P. Colijn13, A. Connolly25, M. Convery42, J. Conway44, M. Cordelli15, J. Cranshaw46, R. Culbertson13, D. Dagenhart4, S. D’Auria17, S. De Cecco43, F. DeJongh13, S. Dell’Agnello15, M. Dell’Orso38, S. Demers41, L. Demortier42, M. Deninno3, D. De Pedis43, P. F. Derwent13, T. Devlin44, C. Dionisi43, J. R. Dittmann13, A. Dominguez25, S. Donati38, M. D’Onofrio38, T. Dorigo36, N. Eddy20, K. Einsweiler25, E. Engels, Jr.39, R. Erbacher13, D. Errede20, S. Errede20, R. Eusebi41, Q. Fan41, H.-C. Fang25, S. Farrington17, R. G. Feild52, J. P. Fernandez40, C. Ferretti28, R. D. Field14, I. Fiori3, B. Flaugher13, L. R. Flores-Castillo39, G. W. Foster13, M. Franklin18, J. Freeman13, J. Friedman27, Y. Fukui23, I. Furic27, S. Galeotti38, A. Gallas32, M. Gallinaro42, T. Gao37, M. Garcia-Sciveres25, A. F. Garfinkel40, P. Gatti36, C. Gay52, D. W. Gerdes28, E. Gerstein9, S. Giagu43, P. Giannetti38, K. Giolo40, M. Giordani5, V. Glagolev11, D. Glenzinski13, M. Gold31, N. Goldschmidt28, J. Goldstein13, G. Gomez8, M. Goncharov45, I. Gorelov31, A. T. Goshaw12, Y. Gotra39, K. Goulianos42, C. Green40, A. Gresele36, G. Grim5, C. Grosso-Pilcher10, M. Guenther40, G. Guillian28, J. Guimaraes da Costa18, R. M. Haas14, C. Haber25, S. R. Hahn13, E. Halkiadakis41, C. Hall18, T. Handa19, R. Handler51, F. Happacher15, K. Hara48, A. D. Hardman40, R. M. Harris13, F. Hartmann22, K. Hatakeyama42, J. Hauser6, J. Heinrich37, A. Heiss22, M. Hennecke22, M. Herndon21, C. Hill7, A. Hocker41, K. D. Hoffman10, R. Hollebeek37, L. Holloway20, S. Hou1, B. T. Huffman35, R. Hughes33, J. Huston29, J. Huth18, H. Ikeda48, C. Issever7, J. Incandela7, G. Introzzi38, M. Iori43, A. Ivanov41, J. Iwai50, Y. Iwata19, B. Iyutin27, E. James28, M. Jones37, U. Joshi13, H. Kambara16, T. Kamon45, T. Kaneko48, J. Kang28, M. Karagoz Unel32, K. Karr49, S. Kartal13, H. Kasha52, Y. Kato34, T. A. Keaffaber40, K. Kelley27, M. Kelly28, R. D. Kennedy13, R. Kephart13, D. Khazins12, T. Kikuchi48, B. Kilminster41, B. J. Kim24, D. H. Kim24, H. S. Kim20, M. J. Kim9, S. B. Kim24, S. H. Kim48, T. H. Kim27, Y. K. Kim25, M. Kirby12, M. Kirk4, L. Kirsch4, S. Klimenko14, P. Koehn33, K. Kondo50, J. Konigsberg14, A. Korn27, A. Korytov14, K. Kotelnikov30, E. Kovacs2, J. Kroll37, M. Kruse12, V. Krutelyov45, S. E. Kuhlmann2, K. Kurino19, T. Kuwabara48, N. Kuznetsova13, A. T. Laasanen40, N. Lai10, S. Lami42, S. Lammel13, J. Lancaster12, K. Lannon20, M. Lancaster26, R. Lander5, A. Lath44, G. Latino31, T. LeCompte2, Y. Le21, J. Lee41, S. W. Lee45, N. Leonardo27, S. Leone38, J. D. Lewis13, K. Li52, C. S. Lin13, M. Lindgren6, T. M. Liss20, J. B. Liu41, T. Liu13, Y. C. Liu1, D. O. Litvintsev13, O. Lobban46, N. S. Lockyer37, A. Loginov30, J. Loken35, M. Loreti36, D. Lucchesi36, P. Lukens13, S. Lusin51, L. Lyons35, J. Lys25, R. Madrak18, K. Maeshima13, P. Maksimovic21, L. Malferrari3, M. Mangano38, G. Manca35, M. Mariotti36, G. Martignon36, M. Martin21, A. Martin52, V. Martin32, M. Martínez13, J. A. J. Matthews31, P. Mazzanti3, K. S. McFarland41, P. McIntyre45, M. Menguzzato36, A. Menzione38, P. Merkel13, C. Mesropian42, A. Meyer13, T. Miao13, R. Miller29, J. S. Miller28, H. Minato48, S. Miscetti15, M. Mishina23, G. Mitselmakher14, Y. Miyazaki34, N. Moggi3, E. Moore31, R. Moore28, Y. Morita23, T. Moulik40, M. Mulhearn27, A. Mukherjee13, T. Muller22, A. Munar38, P. Murat13, S. Murgia29, J. Nachtman6, V. Nagaslaev46, S. Nahn52, H. Nakada48, I. Nakano19, R. Napora21, F. Niell28, C. Nelson13, T. Nelson13, C. Neu33, M. S. Neubauer27, D. Neuberger22, C. Newman-Holmes13, C.-Y. P. Ngan27, T. Nigmanov39, H. Niu4, L. Nodulman2, A. Nomerotski14, S. H. Oh12, Y. D. Oh24, T. Ohmoto19, T. Ohsugi19, R. Oishi48, T. Okusawa34, J. Olsen51, W. Orejudos25, C. Pagliarone38, F. Palmonari38, R. Paoletti38, V. Papadimitriou46, D. Partos4, J. Patrick13, G. Pauletta47, M. Paulini9, T. Pauly35, C. Paus27, D. Pellett5, A. Penzo47, L. Pescara36, T. J. Phillips12, G. Piacentino38, J. Piedra8, K. T. Pitts20, A. Pompoš40, L. Pondrom51, G. Pope39, T. Pratt35, F. Prokoshin11, J. Proudfoot2, F. Ptohos15, O. Pukhov11, G. Punzi38, J. Rademacker35, A. Rakitine27, F. Ratnikov44, H. Ray28, D. Reher25, A. Reichold35, P. Renton35, M. Rescigno43, A. Ribon36, W. Riegler18, F. Rimondi3, L. Ristori38, W. J. Robertson12, T. Rodrigo8, S. Rolli49, L. Rosenson27, R. Roser13, R. Rossin36, C. Rott40, A. Roy40, A. Ruiz8, D. Ryan49, A. Safonov5, R. St. Denis17, W. K. Sakumoto41, D. Saltzberg6, C. Sanchez33, A. Sansoni15, L. Santi47, S. Sarkar43, H. Sato48, A. Savoy-Navarro13, P. Schlabach13, E. E. Schmidt13, M. P. Schmidt52, M. Schmitt32, L. Scodellaro36, A. Scott6, A. Scribano38, A. Sedov40, S. Seidel31, Y. Seiya48, A. Semenov11, F. Semeria3, T. Shah27, M. D. Shapiro25, P. F. Shepard39, T. Shibayama48, M. Shimojima48, M. Shochet10, A. Sidoti36, J. Siegrist25, A. Sill46, P. Singh20, A. J. Slaughter52, K. Sliwa49, F. D. Snider13, R. Snihur26, A. Solodsky42, J. Spalding13, T. Speer16, M. Spezziga46, P. Sphicas27, F. Spinella38, M. Spiropulu10, L. Spiegel13, J. Steele51, A. Stefanini38, J. Strologas20, F. Strumia16, D. Stuart7, A. Sukhanov14, K. Sumorok27, T. Suzuki48, T. Takano34, R. Takashima19, K. Takikawa48, P. Tamburello12, M. Tanaka48, B. Tannenbaum6, M. Tecchio28, R. J. Tesarek13, P. K. Teng1, K. Terashi42, S. Tether27, J. Thom13, A. S. Thompson17, E. Thomson33, R. Thurman-Keup2, P. Tipton41, S. Tkaczyk13, D. Toback45, K. Tollefson29, D. Tonelli38, M. Tonnesmann29, H. Toyoda34, J. F. de Troconiz18, J. Tseng27, D. Tsybychev14, N. Turini38, F. Ukegawa48, T. Unverhau17, T. Vaiciulis41, J. Valls44, A. Varganov28, E. Vataga38, S. Vejcik, III13, G. Velev13, G. Veramendi25, R. Vidal13, I. Vila8, R. Vilar8, I. Volobouev25, M. von der Mey6, D. Vucinic27, R. G. Wagner2, R. L. Wagner13, W. Wagner22, N. B. Wallace44, Z. Wan44, C. Wang12, M. J. Wang1, S. M. Wang14, B. Ward17, S. Waschke17, T. Watanabe48, D. Waters26, T. Watts44, M. Weber25, H. Wenzel22, W. C. Wester, III13, B. Whitehouse49, A. B. Wicklund2, E. Wicklund13, T. Wilkes5, H. H. Williams37, P. Wilson13, B. L. Winer33, D. Winn28, S. Wolbers13, D. Wolinski28, J. Wolinski29, S. Wolinski28, M. Wolter49, S. Worm44, X. Wu16, F. Würthwein27, J. Wyss38, U. K. Yang10, W. Yao25, G. P. Yeh13, P. Yeh1, K. Yi21, J. Yoh13, C. Yosef29, T. Yoshida34, I. Yu24, S. Yu37, Z. Yu52, J. C. Yun13, L. Zanello43, A. Zanetti47, F. Zetti25, and S. Zucchelli31 (CDF Collaboration)
1Institute of Physics, Academia Sinica, Taipei, Taiwan 11529, Republic of China
2Argonne National Laboratory, Argonne, Illinois 60439, USA
3Istituto Nazionale di Fisica Nucleare, University of Bologna, I-40127 Bologna, Italy
4Brandeis University, Waltham, Massachusetts 02254, USA
5University of California at Davis, Davis, California 95616, USA
6University of California at Los Angeles, Los Angeles, California 90024, USA
7University of California at Santa Barbara, Santa Barbara, California 93106, USA
8Instituto de Fisica de Cantabria, CSIC-University of Cantabria, 39005 Santander, Spain
9Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA
10Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637, USA
11Joint Institute for Nuclear Research, RU-141980 Dubna, Russia
12Duke University, Durham, North Carolina 27708, USA
13Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA
14University of Florida, Gainesville, Florida 32611, USA
15Laboratori Nazionali di Frascati, Istituto Nazionale di Fisica Nucleare, I-00044 Frascati, Italy
16University of Geneva, CH-1211 Geneva 4, Switzerland
17Glasgow University, Glasgow G12 8QQ, United Kingdom
18Harvard University, Cambridge, Massachusetts 02138, USA
19Hiroshima University, Higashi-Hiroshima 724, Japan
20University of Illinois, Urbana, Illinois 61801, USA
21The Johns Hopkins University, Baltimore, Maryland 21218, USA
22Institut für Experimentelle Kernphysik, Universität Karlsruhe, 76128 Karlsruhe, Germany
23High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305, Japan
24Center for High Energy Physics, Kyungpook National University, Taegu 702-701, Korea; Seoul National University, Seoul 151-742, Korea; and Sung Kyun Kwan University, Suwon 440-746, Korea
25Ernest Orlando Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
26University College London, London WC1E 6BT, United Kingdom
27Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
28University of Michigan, Ann Arbor, Michigan 48109, USA
29Michigan State University, East Lansing, Michigan 48824, USA
30Institution for Theoretical and Experimental Physics, ITEP, Moscow 117259, Russia
31University of New Mexico, Albuquerque, New Mexico 87131, USA
32Northwestern University, Evanston, Illinois 60208, USA
33The Ohio State University, Columbus, Ohio 43210, USA
34Osaka City University, Osaka 588, Japan
35University of Oxford, Oxford OX1 3RH, United Kingdom
36Universita di Padova, Istituto Nazionale di Fisica Nucleare, Sezione di Padova, I-35131 Padova, Italy
37University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
38Istituto Nazionale di Fisica Nucleare, University and Scuola Normale Superiore of Pisa, I-56100 Pisa, Italy
39University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA
40Purdue University, West Lafayette, Indiana 47907, USA
41University of Rochester, Rochester, New York 14627, USA
42Rockefeller University, New York, New York 10021, USA
43Instituto Nazionale de Fisica Nucleare, Sezione di Roma, University di Roma I, “La Sapienza,” I-00185 Roma, Italy
44Rutgers University, Piscataway, New Jersey 08855, USA
45Texas A&M University, College Station, Texas 77843, USA
46Texas Tech University, Lubbock, Texas 79409, USA
47Istituto Nazionale di Fisica Nucleare, University of Trieste, Udine, Italy
48University of Tsukuba, Tsukuba, Ibaraki 305, Japan
49Tufts University, Medford, Massachusetts 02155, USA
50Waseda University, Tokyo 169, Japan
51University of Wisconsin, Madison, Wisconsin 53706, USA
52Yale University, New Haven, Connecticut 06520, USA
Received 15 February 2003; published 3 July 2003
We report a measurement of the fraction of events with a large pseudorapidity gap Δη within the pseudorapidity region available to the proton dissociation products X in p̅ +p→p̅ +X. For a final state p̅ of fractional momentum loss ξp̅ and 4-momentum transfer squared tp̅ within 0.06<ξp̅ <0.09 and |tp̅ |<1.0 [0.2] GeV2 at √s=1800 [630] GeV, the fraction of events with Δη>3 is found to be 0.246±0.001 (stat)±0.042 (syst) [0.184±0.001 (stat)±0.043 (syst)]. Our results are compared with gap fractions measured in minimum bias p̅ p collisions and with theoretical expectations.
© 2003 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.91.011802
DOI:
10.1103/PhysRevLett.91.011802
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