Phys. Rev. Lett.
74,
855–859
(1995)
Observation of Rapidity Gaps in p̅ p Collisions at 1.8 TeV
F. Abe et al. (CDF Collaboration)
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F. Abe12, M. Albrow6, D. Amidei15, C. Anway-Wiese3, G. Apollinari23, M. Atac6, P. Auchincloss22, P. Azzi17, N. Bacchetta16, A. R. Baden8, W. Badgett15, M. W. Bailey21, A. Bamberger6, P. de Barbaro22, A. Barbaro-Galtieri13, V. E. Barnes21, B. A. Barnett11, P. Bartalini20, G. Bauer14, T. Baumann8, F. Bedeschi20, S. Behrends2, S. Belforte20, G. Bellettini20, J. Bellinger28, D. Benjamin27, J. Benlloch14, J. Bensinger2, A. Beretvas6, J. P. Berge6, S. Bertolucci7, K. Biery10, S. Bhadra9, M. Binkley6, D. Bisello17, R. Blair1, C. Blocker2, A. Bodek22, V. Bolognesi20, A. W. Booth6, C. Boswell11, G. Brandenburg8, D. Brown8, E. Buckley-Geer6, H. S. Budd22, G. Busetto17, A. Byon-Wagner6, K. L. Byrum1, C. Campagnari6, M. Campbell15, A. Caner6, R. Carey8, W. Carithers13, D. Carlsmith28, J. T. Carroll6, R. Cashmore6, A. Castro17, Y. Cen18, F. Cervelli20, K. Chadwick6, J. Chapman15, G. Chiarelli7, W. Chinowsky13, S. Cihangir6, A. G. Clark6, M. Cobal20, D. Connor18, M. Contreras4, J. Cooper6, M. Cordelli7, D. Crane6, J. D. Cunningham2, C. Day6, F. DeJongh6, S. Dell'Agnello20, M. Dell'Orso20, L. Demortier23, B. Denby6, P. F. Derwent15, T. Devlin24, M. Dickson22, S. Donati20, R. B. Drucker13, A. Dunn15, K. Einsweiler13, J. E. Elias6, R. Ely13, S. Eno4, S. Errede9, A. Etchegoyen6, B. Farhat14, G. J. Feldman8, B. Flaugher6, G. W. Foster6, M. Franklin8, M. Frautschi16, J. Freeman6, H. Frisch4, T. Fuess6, Y. Fukui12, G. Gagliardi20, A. F. Garfinkel21, A. Gauthier9, S. Geer6, D. W. Gerdes15, P. Giannetti20, N. Giokaris23, L. Gladney18, M. Gold16, J. Gonzalez18, A. Goshaw5, K. Goulianos23, H. Grassmann17, G. M. Grieco20, R. Grindley10, C. Grosso-Pilcher4, C. Haber13, S. R. Hahn6, R. Handler28, K. Hara26, B. Harral18, R. M. Harris6, S. A. Hauger5, J. Hauser3, C. Hawk24, T. Hessing25, R. Hollebeek18, L. Holloway9, A. Hölscher10, S. Hong15, G. Houk18, P. Hu19, B. Hubbard13, B. T. Huffman19, R. Hughes22, P. Hurst8, J. Huth6, J. Hylen6, M. Incagli20, T. Ino26, H. Iso26, H. Jensen6, C. P. Jessop8, R. P. Johnson6, U. Joshi6, R. W. Kadel13, T. Kamon25, S. Kanda26, D. A. Kardelis9, I. Karliner9, E. Kearns8, L. Keeble25, R. Kephart6, P. Kesten2, R. M. Keup9, H. Keutelian6, D. Kim6, S. B. Kim15, S. H. Kim26, Y. K. Kim13, L. Kirsch2, K. Kondo26, J. Konigsberg8, K. Kordas10, E. Kovacs6, M. Krasberg15, S. E. Kuhlmann1, E. Kuns24, A. T. Laasanen21, S. Lammel3, J. I. Lamoureux28, S. Leone20, J. D. Lewis6, W. Li1, P. Limon6, M. Lindgren3, T. M. Liss9, N. Lockyer18, M. Loreti17, E. H. Low18, D. Lucchesi20, C. B. Luchini9, P. Lukens6, P. Maas28, K. Maeshima6, M. Mangano20, J. P. Marriner6, M. Mariotti20, R. Markeloff28, L. A. Markosky28, J. A. J. Matthews16, R. Mattingly2, P. McIntyre25, A. Menzione20, E. Meschi20, T. Meyer25, S. Mikamo12, M. Miller4, T. Mimashi26, S. Miscetti7, M. Mishina12, S. Miyashita26, Y. Morita26, S. Moulding23, J. Mueller24, A. Mukherjee6, T. Muller3, L. F. Nakae2, I. Nakano26, C. Nelson6, D. Neuberger3, C. Newman-Holmes6, J. S. T. Ng8, M. Ninomiya26, L. Nodulman1, S. Ogawa26, C. Pagliarone20, R. Paoletti20, V. Papadimitriou6, A. Para6, E. Pare8, S. Park6, J. Patrick6, G. Pauletta20, L. Pescara17, T. J. Phillips5, A. G. Piacentino20, R. Plunkett6, L. Pondrom28, J. Proudfoot1, F. Ptohos8, G. Punzi20, D. Quarrie6, K. Ragan10, G. Redlinger4, J. Rhoades28, M. Roach27, F. Rimondi6, L. Ristori20, W. J. Robertson5, T. Rodrigo6, T. Rohaly18, A. Roodman4, W. K. Sakumoto22, A. Sansoni7, R. D. Sard9, A. Savoy-Navarro6, V. Scarpine9, P. Schlabach8, E. E. Schmidt6, O. Schneider13, M. H. Schub21, R. Schwitters8, G. Sciacca20, A. Scribano20, S. Segler6, S. Seidel16, Y. Seiya26, G. Sganos10, M. Shapiro13, N. M. Shaw21, M. Sheaff28, M. Shochet4, J. Siegrist13, A. Sill22, P. Sinervo10, J. Skarha11, K. Sliwa27, D. A. Smith20, F. D. Snider11, L. Song6, T. Song15, M. Spahn13, P. Sphicas14, A. Spies11, R. St. Denis8, L. Stanco17, A. Stefanini20, G. Sullivan4, K. Sumorok14, R. L. Swartz, Jr.9, M. Takano26, K. Takikawa26, S. Tarem2, F. Tartarelli20, S. Tether14, D. Theriot6, M. Timko27, P. Tipton22, S. Tkaczyk6, A. Tollestrup6, J. Tonnison21, W. Trischuk8, Y. Tsay4, J. Tseng11, N. Turini20, F. Ukegawa26, D. Underwood1, S. Vejcik, III15, R. Vidal6, R. G. Wagner1, R. L. Wagner6, N. Wainer6, R. C. Walker22, J. Walsh18, A. Warburton10, G. Watts22, T. Watts24, R. Webb25, C. Wendt28, H. Wenzel20, W. C. Wester, III13, T. Westhusing9, S. N. White23, A. B. Wicklund1, E. Wicklund6, H. H. Williams18, B. L. Winer22, J. Wolinski25, D. Y. Wu15, X. Wu20, J. Wyss17, A. Yagil6, W. Yao13, K. Yasuoka26, Y. Ye10, G. P. Yeh6, J. Yoh6, M. Yokoyama26, J. C. Yun6, A. Zanetti20, F. Zetti20, S. Zhang15, W. Zhang18, and S. Zucchelli6 (CDF Collaboration)
1Argonne National Laboratory, Argonne, Illinois 60439
2Brandeis University, Waltham, Massachusetts 02254
3University of California at Los Angeles, Los Angeles, California 90024
4University of Chicago, Chicago, Illinois 60637
5Duke University, Durham, North Carolina 27706
6Fermi National Accelerator Laboratory, Batavia, Illinois 60510
7Laboratori Nazionali di Frascati, Istituto Nazionale di Fisica Nucleare, Frascati, Italy
8Harvard University, Cambridge, Massachusetts 02138
9University of Illinois, Urbana, Illinois 61801
10Institute of Particle Physics, McGill University, Montreal, and University of Toronto, Toronto, Canada
11The Johns Hopkins University, Baltimore, Maryland 21218
12National Laboratory for High Energy Physics (KEK), Japan
13Lawrence Berkeley Laboratory, Berkeley, California 94720
14Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
15University of Michigan, Ann Arbor, Michigan 48109
16University of New Mexico, Albuquerque, New Mexico 87131
17Universita di Padova, Instituto Nazionale di Fisica Nucleare, Sezione di Padova, I-35131 Padova, Italy
18University of Pennsylvania, Philadelphia, Pennsylvania 19104
19University of Pittsburgh, Pittsburgh, Pennsylvania 15260
20Istituto Nazionale di Fisica Nucleare, University and Scuola Normale Superiore of Pisa, I-56100 Pisa, Italy
21Purdue University, West Lafayette, Indiana 47907
22University of Rochester, Rochester, New York 15627
23Rockefeller University, New York, New York 10021
24Rutgers University, Piscataway, New Jersey 08854
25Texas A&M University, College Station, Texas 77843
26University of Tsukuba, Tsukuba, Ibaraki 305, Japan
27Tufts University, Medford, Massachusetts 02155
28University of Wisconsin, Madison, Wisconsin 53706
Received 13 July 1994; published in the issue dated 6 February 1995
In pp̅ collisions at √s=1.8 TeV we find jet events with a rapidity gap topology. The number of hadrons in the rapidity interval ΔηD between leading-jet cones was sampled by charged tracks with PT>400 MeV/c. We find excess trackless events beyond that expected in a smooth multiplicity distribution. In a control region outside ΔηD we see no excess. For ΔηD>0.8, the fraction of excess trackless events, consistent with estimates based on exchange of color-singlet digluons, is R(gap)=σjet(gap)/σjet=0.0085±0.0012(stat)-0.0012+0.0024(syst).
© 1995 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.74.855
DOI:
10.1103/PhysRevLett.74.855
PACS:
13.87.-a, 12.38.Qk, 12.40.Nn, 13.85.-t
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