Abstract

Using the DØ detector, we have observed events produced in p̄p collisions that contain W or Z bosons in conjunction with very little energy deposition (“rapidity gaps”) in large forward regions of the detector. The fraction of W boson events with a rapidity gap (a signature for diffraction) is 0.89±0.190.17%, and the probability that the non-diffractive background fluctuated to yield the observed diffractive signal is 3×10−14, corresponding to a significance of 7.5σ. The Z boson sample has a gap fraction of 1.44±0.610.52%, with a significance of 4.4σ. The diffractive events have very similar properties to the more common non-diffractive component.

Highlights

  • )], where θ is the polar angle relative to the beam)

  • 3.6 the observed number of events after the single interaction selection. This method demonstrates that our single interaction requirement is quite effective, and yields only an absolute correction of (0.09 ± 0.05)% for the central electron W boson and the Z boson samples and a negligible correction for the forward electron W boson sample

  • The measured gap fraction of 1.08±00..1179% for central electron W boson events cannot be directly compared to the CDF measurement of (1.15 ± 0.55)% [16], which includes a correction factor derived from the POMPYT diffractive Monte Carlo [22] to attempt to account for how often a diffractive event does not yield a rapidity gap

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Summary

DØ Collaboration

R. Hirosky bg, J.D. Hobbs az, B. Hoeneisen h, J. Huang al, Y. Huang au, I. Iashvili af, R. Illingworth z, A.S. Ito ah, M. Jaffré k, S. Jain q, R. Jesik z, K. Johns aa, M. Johnson ah, A. Jonckheere ah, H. Jöstlein ah, A. Juste ah, W. Kahl ap, S. Kahn ba, E. Kajfasz j, A.M. Kalinin u, D. Karmanov w, D. Karmgard am, R. Kehoe av, A. Khanov ay, A. Kharchilava am, B. Klima ah, J.M. Kohli o, A.V. Kostritskiy x, J. Kotcher ba, B. Kothari ax, A.V. Kozelov x, E.A. Kozlovsky x, J. Krane an, M.R. Krishnaswamy q, P. Krivkova f, S. Krzywdzinski ah, M. Kubantsev ap, S. Kuleshov v, Y. Kulik ah, S. Kunori ar, A. Kupco g, V.E. Kuznetsov af, G. Landsberg bd, W.M. Lee ag, A. Leflat w, F. Lehner ah,1, C. Leonidopoulos ax, J. Li be, Q.Z. Li ah, J.G.R. Lima c, D. Lincoln ah, S.L. Linn ag, J. Linnemann av, R. Lipton ah, A. Lucotte i, L. Lueking ah, C. Lundstedt aw, C. Luo al, A.K.A. Maciel aj, R.J. Madaras ab, V.L. Malyshev u, V. Manankov w, H.S. Mao d, T. Marshall al, M.I. Martin aj, K. Mauritz an, A.A. Mayorov x, R. McCarthy az, T. McMahon bb, H.L. Melanson ah, M. Merkin w, K.W. Merritt ah, C. Miao bd, H. Miettinen bf, D. Mihalcea aj, N. Mokhov ah, N.K. Mondal q, H.E. Montgomery ah, R.W. Moore av, Y.D. Mutaf az, E. Nagy j, F. Nang aa, M. Narain as, V.S. Narasimham q, N.A. Naumann t, H.A. Neal au, J.P. Negret e, A. Nomerotski ah, T. Nunnemann ah, D. O’Neil av, V. Oguri c, B. Olivier l, N. Oshima ah, P. Padley bf, K. Papageorgiou ai, N. Parashar aq, R. Partridge bd, N. Parua az, A. Patwa az, O. Peters s, P. Pétroff k, R. Piegaia a, B.G. Pope av, H.B. Prosper ag, S. Protopopescu ba, M.B. Przybycien ak,2, J. Qian au, R. Raja ah, S. Rajagopalan ba, P.A. Rapidis ah, N.W. Reay ap, S. Reucroft at, M. Ridel k, M. Rijssenbeek az, F. Rizatdinova ap, T. Rockwell av, C. Royon m, P. Rubinov ah, R. Ruchti am, B.M. Sabirov u, G. Sajot i, A. Santoro c, L. Sawyer aq, R.D. Schamberger az, H. Schellman ak, A. Schwartzman a, E. Shabalina ai, R.K. Shivpuri p, D. Shpakov at, M. Shupe aa, R.A. Sidwell ap, V. Simak g, V. Sirotenko ah, P. Slattery ay, R.P. Smith ah, G.R. Snow aw, J. Snow bb, S. Snyder ba, J. Solomon ai, Y. Song be, V. Sorín a, M. Sosebee be, N. Sotnikova w, K. Soustruznik f, M. Souza b, N.R. Stanton ap, G. Steinbrück ax, D. Stoker ae, V. Stolin v, A. Stone aq, D.A. Stoyanova x, M.A. Strang be, M. Strauss bc, M. Strovink ab, L. Stutte ah, A. Sznajder c, M. Talby j, W. Taylor az, S. Tentindo-Repond ag, S.M. Tripathi ac, T.G. Trippe ab, A.S. Turcot ba, P.M. Tuts ax, R. Van Kooten al, V. Vaniev x, N. Varelas ai, F. Villeneuve-Seguier j, A.A. Volkov x, A.P. Vorobiev x, H.D. Wahl ag, Z.-M. Wang az, J. Warchol am, G. Watts bh, M. Wayne am, H. Weerts av, A. White be, D. Whiteson ab, D.A. Wijngaarden t, S. Willis aj, S.J. Wimpenny af, J. Womersley ah, D.R. Wood at, Q. Xu au, R. Yamada ah, P. Yamin ba, T. Yasuda ah, Y.A. Yatsunenko u, K. Yip ba, J. Yu be, M. Zanabria e, X. Zhang bc, H. Zheng am, B. Zhou au, Z. Zhou an, M. Zielinski ay, D. Zieminska al, A. Zieminski al, V. Zutshi aj, E.G. Zverev w, A. Zylberstejn m a Universidad de Buenos Aires, Buenos Aires, Argentina b LAFEX, Centro Brasileiro de Pesquisas Físicas, Rio de Janeiro, Brazil c Universidade do Estado do Rio de Janeiro, Rio de Janeiro, Brazil d Institute of High Energy Physics, Beijing, People’s Republic of China e Universidad de los Andes, Bogotá, Colombia f Charles University, Center for Particle Physics, Prague, Czech Republic g Institute of Physics, Academy of Sciences, Center for Particle Physics, Prague, Czech Republic h Universidad San Francisco de Quito, Quito, Ecuador i Laboratoire de Physique Subatomique et de Cosmologie, IN2P3-CNRS, Université de Grenoble 1, Grenoble, France j CPPM, IN2P3-CNRS, Université de la Méditerranée, Marseille, France k Laboratoire de l’Accélérateur Linéaire, IN2P3-CNRS, Orsay, France l LPNHE, Universités Paris VI and VII, IN2P3-CNRS, Paris, France m DAPNIA/Service de Physique des Particules, CEA, Saclay, France n Universität Mainz, Institut für Physik, Mainz, Germany o Panjab University, Chandigarh, India p Delhi University, Delhi, India q Tata Institute of Fundamental Research, Mumbai, India r CINVESTAV, Mexico City, Mexico s FOM-Institute NIKHEF and University of Amsterdam/NIKHEF, Amsterdam, The Netherlands t University of Nijmegen/NIKHEF, Nijmegen, The Netherlands u Joint Institute for Nuclear Research, Dubna, Russia v Institute for Theoretical and Experimental Physics, Moscow, Russia w Moscow State University, Moscow, Russia x Institute for High Energy Physics, Protvino, Russia y Lancaster University, Lancaster, United Kingdom z Imperial College, London, United Kingdom aa University of Arizona, Tucson, AZ 85721, USA ab Lawrence Berkeley National Laboratory and University of California, Berkeley, CA 94720, USA ac University of California, Davis, CA 95616, USA ad California State University, Fresno, CA 93740, USA ae University of California, Irvine, CA 92697, USA af University of California, Riverside, CA 92521, USA ag Florida State University, Tallahassee, FL 32306, USA ah Fermi National Accelerator Laboratory, Batavia, IL 60510, USA ai University of Illinois at Chicago, Chicago, IL 60607, USA aj Northern Illinois University, DeKalb, IL 60115, USA ak Northwestern University, Evanston, IL 60208, USA al Indiana University, Bloomington, IN 47405, USA am University of Notre Dame, Notre Dame, IN 46556, USA an Iowa State University, Ames, IA 50011, USA ao University of Kansas, Lawrence, KS 66045, USA ap Kansas State University, Manhattan, KS 66506, USA aq Louisiana Tech University, Ruston, LA 71272, USA ar University of Maryland, College Park, MD 20742, USA as Boston University, Boston, MA 02215, USA at Northeastern University, Boston, MA 02115, USA au University of Michigan, Ann Arbor, MI 48109, USA av Michigan State University, East Lansing, MI 48824, USA aw University of Nebraska, Lincoln, NE 68588, USA ax Columbia University, New York, NY 10027, USA ay University of Rochester, Rochester, NY 14627, USA az State University of New York, Stony Brook, NY 11794, USA ba Brookhaven National Laboratory, Upton, NY 11973, USA bb Langston University, Langston, OK 73050, USA bc University of Oklahoma, Norman, OK 73019, USA bd Brown University, Providence, RI 02912, USA be University of Texas, Arlington, TX 76019, USA bf Rice University, Houston, TX 77005, USA bg University of Virginia, Charlottesville, VA 22901, USA bh University of Washington, Seattle, WA 98195, USA Received 28 August 2003; accepted 1 September 2003

Comment two electrons
Forward W
Findings
ZD Z
Full Text
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