https://doi.org/10.1140/epjc/s10052-007-0443-z
Regular Article - Experimental Physics
Bose–Einstein study of position–momentum correlations of charged pions in hadronic Z0 decays
1
School of Physics and Astronomy, University of Birmingham, Birmingham, B15 2TT, UK
2
Dipartimento di Fisica dell’ Università di Bologna and INFN, 40126, Bologna, Italy
3
Physikalisches Institut, Universität Bonn, 53115, Bonn, Germany
4
Department of Physics, University of California, Riverside, CA, 92521, USA
5
Cavendish Laboratory, Cambridge, CB3 0HE, UK
6
Ottawa-Carleton Institute for Physics, Department of Physics, Carleton University, Ottawa, Ontario, K1S 5B6, Canada
7
CERN, European Organisation for Nuclear Research, 1211, Geneva 23, Switzerland
8
Enrico Fermi Institute and Department of Physics, University of Chicago, Chicago, IL, 60637, USA
9
Fakultät für Physik, Albert-Ludwigs-Universität Freiburg, 79104, Freiburg, Germany
10
Physikalisches Institut, Universität Heidelberg, 69120, Heidelberg, Germany
11
Department of Physics, Indiana University, Bloomington, IN, 47405, USA
12
Queen Mary and Westfield College, University of London, London, E1 4NS, UK
13
III Physikalisches Institut, Technische Hochschule Aachen, Sommerfeldstrasse 26–28, 52056, Aachen, Germany
14
University College London, London, WC1E 6BT, UK
15
School of Physics and Astronomy, Schuster Laboratory, The University of Manchester, M13 9PL, Manchester, UK
16
Department of Physics, University of Maryland, College Park, MD, 20742, USA
17
Laboratoire de Physique Nucléaire, Université de Montréal, Montréal, Québec, H3C 3J7, Canada
18
Department of Physics, University of Oregon, Eugene, OR, 97403, USA
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Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire, OX11 0QX, UK
20
Department of Physics, Technion-Israel Institute of Technology, Haifa, 32000, Israel
21
Department of Physics and Astronomy, Tel Aviv University, Tel Aviv, 69978, Israel
22
Kobe University, Kobe, 657-8501, Japan
23
Particle Physics Department, Weizmann Institute of Science, Rehovot, 76100, Israel
24
Institut für Experimentalphysik, Universität Hamburg/DESY, Notkestrasse 85, 22607, Hamburg, Germany
25
Department of Physics, University of Victoria, P.O. Box 3055, Victoria, BC, V8W 3P6, Canada
26
Department of Physics, University of British Columbia, Vancouver, BC, V6T 1Z1, Canada
27
Department of Physics, University of Alberta, Edmonton, AB, T6G 2J1, Canada
28
Research Institute for Particle and Nuclear Physics, 1525, Budapest, P.O. Box 49, Hungary
29
Institute of Nuclear Research, 4001, Debrecen, P.O. Box 51, Hungary
30
Sektion Physik, Ludwig-Maximilians-Universität München, Am Coulombwall 1, 85748, Garching, Germany
31
Max-Planck-Institute für Physik, Föhringer Ring 6, 80805, München, Germany
32
Department of Physics, Yale University, New Haven, CT, 06520, USA
33
International Centre for Elementary Particle Physics and Department of Physics, University of Tokyo, Tokyo, 113-0033, Japan
34
TRIUMF, Vancouver, Canada V6T 2A3,
35
University of Alberta, Edmonton, Canada
36
Institute of Nuclear Research, Debrecen, Hungary
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Institute of Physics, Academy of Sciences of the Czech Republic, 18221, Prague, Czech Republic
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Department of Experimental Physics, University of Debrecen, Debrecen, Hungary
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MPI München, München, Germany
40
Research Institute for Particle and Nuclear Physics, Budapest, Hungary
41
Dept. of Physics, University of Liverpool, Liverpool, L69 3BX, UK
42
Dept. Physics, University of Illinois at Urbana-Champaign, Urbana-Champaign , USA
43
The University of Manchester, Manchester, M13 9PL, UK
44
Dept of Physics and Astronomy, University of Kansas, Lawrence, KS, 66045, USA
45
Dept. of Physics, University of Toronto, Toronto, Canada
46
Bergische Universität, Wuppertal, Germany
47
University of Mining and Metallurgy, Cracow, Poland
48
University of California, San Diego, USA
49
The University of Melbourne, Victoria, Australia
50
IPHE Université de Lausanne, 1015, Lausanne, Switzerland
51
IEKP Universität Karlsruhe, Karlsruhe, Germany
52
Physics Department, University of Antwerpen, 2610, Antwerpen, Belgium
53
Technische Universität, Dresden, Germany
54
High Energy Accelerator Research Organisation (KEK), Tsukuba, Ibaraki, Japan
55
University of Pennsylvania, Philadelphia, Pennsylvania, USA
56
TRIUMF, Vancouver, Canada
57
Columbia University, New York, USA
58
DESY, Hamburg, Germany
* e-mail: David.Plane@cern.ch
Received:
9
July
2007
Published online:
19
October
2007
A study of Bose–Einstein correlations in pairs of identically charged pions produced in e+e- annihilations at the Z0 peak has been performed for the first time assuming a non-static emitting source. The results are based on the high statistics data obtained with the OPAL detector at LEP. The correlation functions have been analyzed in intervals of the average pair transverse momentum and of the pair rapidity, in order to study possible correlations between the pion production points and their momenta (position–momentum correlations). The Yano–Koonin and the Bertsch–Pratt parameterizations have been fitted to the measured correlation functions to estimate the geometrical parameters of the source as well as the velocity of the source elements with respect to the overall centre-of-mass frame. The source rapidity is found to scale approximately with the pair rapidity, and both the longitudinal and transverse source dimensions are found to decrease for increasing average pair transverse momenta.
© Springer-Verlag / Società Italiana di Fisica, 2007