| Article | |
| Report number | hep-ex/0604003 ; CERN-PH-EP-2006-003 ; CERN-PH-EP-2006-003 |
| Title | QCD coherence and correlations of particles with restricted momenta in hadronic Z decays |
| Related title | QUANTUM CHROMODYNAMICS |
| Author(s) |
Abbiendi, G. ; Ainsley, C. ; Akesson, P.F. ; Alexander, G. ; Anagnostou, G. ; Anderson, K.J. ; Asai, S. ; Axen, D. ; Bailey, I. ; Barberio, E. ; Barillari, T. ; Barlow, R.J. ; Batley, R.J. ; Bechtle, P. ; Behnke, T. ; Bell, Kenneth Watson ; Bell, P.J. ; Bella, G. ; Bellerive, A. ; Benelli, G. ; Bethke, S. ; Biebel, O. ; Boeriu, O. ; Bock, P. ; Boutemeur, M. ; Braibant, S. ; Brown, Robert M. ; Burckhart, H.J. ; Campana, S. ; Capiluppi, P. ; Carnegie, R.K. ; Carter, A.A. ; Carter, J.R. ; Chang, C.Y. ; Charlton, D.G. ; Ciocca, C. ; Csilling, A. ; Cuffiani, M. ; Dado, S. ; De Roeck, A. ; De Wolf, E.A. ; Desch, K. ; Dienes, B. ; Dubbert, J. ; Duchovni, E. ; Duckeck, G. ; Duerdoth, I.P. ; Etzion, E. ; Fabbri, F. ; Ferrari, P. ; Fiedler, F. ; Fleck, I. ; Ford, M. ; Frey, A. ; Gagnon, P. ; Gary, John William ; Geich-Gimbel, C. ; Giacomelli, G. ; Giacomelli, P. ; Giunta, Marina ; Goldberg, J. ; Gross, E. ; Grunhaus, J. ; Gruwe, M. ; Gunther, P.O. ; Gupta, A. ; Hajdu, C. ; Hamann, M. ; Hanson, G.G. ; Harel, A. ; Hauschild, M. ; Hawkes, C.M. ; Hawkings, R. ; Herten, G. ; Heuer, R.D. ; Hill, J.C. ; Horvath, D. ; Igo-Kemenes, P. ; Ishii, K. ; Jeremie, H. ; Jovanovic, P. ; Junk, T.R. ; Kanzaki, J. ; Karlen, D. ; Kawagoe, K. ; Kawamoto, T. ; Keeler, R.K. ; Kellogg, R.G. ; Kennedy, B.W. ; Kluth, S. ; Kobayashi, T. ; Kobel, M. ; Komamiya, S. ; Kramer, T. ; Krasznahorkay, A., Jr. ; Krieger, P. ; von Krogh, J. ; Kuhl, T. ; Kupper, M. ; Lafferty, G.D. ; Landsman, H. ; Lanske, D. ; Lellouch, D. ; Letts, J. ; Levinson, L. ; Lillich, J. ; Lloyd, S.L. ; Loebinger, F.K. ; Lu, J. ; Ludwig, A. ; Ludwig, J. ; Mader, W. ; Marcellini, S. ; Martin, A.J. ; Mashimo, T. ; Mattig, Peter ; McKenna, J. ; McPherson, R.A. ; Meijers, F. ; Menges, W. ; Merritt, F.S. ; Mes, H. ; Meyer, Niels T. ; Michelini, A. ; Mihara, S. ; Mikenberg, G. ; Miller, D.J. ; Mohr, W. ; Mori, T. ; Mutter, A. ; Nagai, K. ; Nakamura, I. ; Nanjo, H. ; Neal, H.A. ; Nisius, R. ; O'Neale, S.W. ; Oh, A. ; Oreglia, M.J. ; Orito, S. ; Pahl, C. ; Pasztor, G. ; Pater, J.R. ; Pilcher, J.E. ; Pinfold, J. ; Plane, David E. ; Pooth, O. ; Przybycien, M. ; Quadt, A. ; Rabbertz, K. ; Rembser, C. ; Renkel, P. ; Roney, J.M. ; Rossi, A.M. ; Rozen, Y. ; Runge, K. ; Sachs, K. ; Saeki, T. ; Sarkisyan, E.K.G. ; Schaile, A.D. ; Schaile, O. ; Scharff-Hansen, P. ; Schieck, J. ; Schorner-Sadenius, T. ; Schroder, Matthias ; Schumacher, M. ; Seuster, R. ; Shears, T.G. ; Shen, B.C. ; Sherwood, P. ; Skuja, A. ; Smith, A.M. ; Sobie, R. ; Soldner-Rembold, S. ; Spano, F. ; Stahl, A. ; Strom, David M. ; Strohmer, R. ; Tarem, S. ; Tasevsky, M. ; Teuscher, R. ; Thomson, M.A. ; Torrence, E. ; Toya, D. ; Tran, P. ; Trigger, I. ; Trocsanyi, Z. ; Tsur, E. ; Turner-Watson, M.F. ; Ueda, I. ; Ujvari, B. ; Vollmer, C.F. ; Vannerem, P. ; Vertesi, R. ; Verzocchi, M. ; Voss, H. ; Vossebeld, J. ; Ward, C.P. ; Ward, D.R. ; Watkins, P.M. ; Watson, A.T. ; Watson, N.K. ; Wells, P.S. ; Wengler, T. ; Wermes, N. ; Wilson, G.W. ; Wilson, J.A. ; Wolf, G. ; Wyatt, T.R. ; Yamashita, S. ; Zer-Zion, D. ; Zivkovic, Lidija |
| Affiliation | (CERN) ; (School of Physics and Astronomy, University of Birmingham) ; (Dipartimento di Fisica dell Universita di Bologna and INFN) ; (Physikalisches Institut, Universitat Bonn) ; (Department of Physics, University of California) ; (Cavendish Laboratory, Cambridge) ; (Ottawa-Carleton Institute for Physics, Department of Physics, Carleton University) ; (Enrico Fermi Institute and Department of Physics, University of Chicago) ; (Fakultat fur Physik, Albert Ludwigs Universitat, Freiburg) ; (Physikalisches Institut, Universitat Heidelberg) ; (Indiana University, Department of Physics) ; (Queen Mary and Westfield College, University of London,) ; (Technische Hochschule Aachen, III Physikalisches Institut, Aachen) ; (University College London) ; (Department of Physics, Schuster Laboratory, Manchester) ; (Department of Physics, University of Maryland) ; (Laboratoire de Physique Nucleaire, Universite de Montreal) ; (University of Oregon, Department of Physics) ; (CLRC Rutherford Appleton Laboratory) ; (Department of Physics, Technion-Israel Institute of Technology) ; (Department of Physics and Astronomy, Tel Aviv University) ; (International Centre for Elementary Particle Physics and Department of Physics, University of Tokyo) ; (Kobe University) ; (Particle Physics Department, Weizmann Institute of Science) ; (Universitat Hamburg/DESY) ; (University of Victoria, Department of Physics) ; (University of British Columbia, Department of Physics) ; (University of Alberta, Department of Physics) ; (Research Institute for Particle and Nuclear Physics, Budapest) ; (Institute of Nuclear Research, Hungary) ; (Ludwigs-Maximilians-Universitat Munchen) ; (Max-Planck-Institute fur Physik, Munchen) ; (Yale University,Department of Physics) ; (TRIUMF) |
| Publication | 2006 |
| Imprint | 03 Mar 2006 |
| Number of pages | 17 |
| Note | 17 pages, 4 figures, Submitted to Phys. Letts. B Report-no: CERN-PH-EP/2006-003 |
| In: | Phys. Lett. B 638 (2006) 30-38 |
| DOI | 10.1016/j.physletb.2006.05.016 |
| Subject category | Particle Physics - Experiment |
| Accelerator/Facility, Experiment | CERN LEP ; OPAL |
| Abstract | QCD coherence effects are studied based on measurements of correlations of particles with either restricted transverse momenta, pT<pTcut, where pT is defined with respect to the thrust axis, or restricted absolute momenta, p equiv |p| < pcut, using about four million hadronic Z decays recorded at LEP with the OPAL detector. The correlations are analyzed in terms of normalized factorial and cumulant moments. The analysis is inspired by analytical QCD calculations which, in conjunction with Local Parton-Hadron Duality (LPHD), predict that, due to colour coherence, the multiplicity distribution of particles with restricted transverse momenta should become Poissonian as pTcut decreases. The expected correlation pattern is indeed observed down to pTcut approx 1GeV but not at lower transverse momenta. Furthermore, for pcut to 0 GeV a strong rise is observed in the data, in disagreement with theoretical expectation. The Monte Carlo models reproduce well the measurements at large pTcut and pcut but underestimate their magnitudes at the lowest momenta. The e+e- data are also compared to the measurements in deep-inelastic e+p collisions. Our study indicates difficulties with the LPHD hypothesis when applied to many-particle inclusive observables of soft hadrons. |
| Copyright/License | Copyright © unknown. Published by Elsevier B.V. (License: CC-BY-3.0) |
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