Direct determination of two-pion correlations for pp→ 2π+2π− annihilation at rest
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Direct determination of two-pion correlations for pp→ 2π+2π− annihilation at rest

A. Angelopoulos,CPLEAR Collaboration,A. Apostolakis,E. Aslanides,G. Backenstoss,P. Bargassa,O. Behnke,A. Benelli,V. Bertin,F. Blanc,P. Bloch,P. Carlson,M. Carroll,J. Carvalho,E. Cawley,S. Charalambous,G. Chardin,M. B. Chertok,A. Cody,Mats Danielsson,M. Dejardin,J. Derre,A. Ealet,C. Eleftheriadis,I. Evangelou,L. Faravel,R. Ferreira-Marques,W. Fetscher,M. Fidecaro,A. Filipčič,D. Francis,J. Fry,E. Gabathuler,R. Gamet,D. Garreta,H. -J. Gerber,A. Go,A. Haselden,P. J. Hayman,F. Henry-Couannier,R. W. Hollander,E. Hubert,K. Jon-And,P. -R. Kettle,P. Kokkas,R. Kreuger,R. Le Gac,F. Leimgruber,A. Liolios,M. P. Locher,E. Machado,I Mandić,N. Manthos,G. Marel,V. E. Markushin,M. Mikuž,J. Miller,F. Montanet,A. Müller,T. Nakada,B. Pagels,I. Papadopoulos,P. Pavlopoulos,J. Pinto Da Cunha,A. Policarpo,G. Polivka,R. Rickenbach,B. L. Roberts,T. Ruf,L. Sakeliou,P. Sanders,M. Schäfer,L. A. Schaller,T. Schietinger,A. Schopper,A. Soares,L. Tauscher,C. Thibault,F. Touchard,C. Touramanis,F. Triantis,E. Van Beveren,C. W. E. Van Eijk,S. Vlachos,P. Weber,O. Wigger,M. Wolter,C. Yèche,D. Zavrtanik,D. Zimmerman;A. Angelopoulos;CPLEAR Collaboration;A. Apostolakis;E. Aslanides;G. Backenstoss;P. Bargassa;O. Behnke;A. Benelli;V. Bertin;F. Blanc;P. Bloch;P. Carlson;M. Carroll;J. Carvalho;E. Cawley;S. Charalambous;G. Chardin;M. B. Chertok;A. Cody;Mats Danielsson;M. Dejardin;J. Derre;A. Ealet;C. Eleftheriadis;I. Evangelou;L. Faravel;R. Ferreira-Marques;W. Fetscher;M. Fidecaro;A. Filipčič;D. Francis;J. Fry;E. Gabathuler;R. Gamet;D. Garreta;H. -J. Gerber;A. Go;A. Haselden;P. J. Hayman;F. Henry-Couannier;R. W. Hollander;E. Hubert;K. Jon-And;P. -R. Kettle;P. Kokkas;R. Kreuger;R. Le Gac;F. Leimgruber;A. Liolios;M. P. Locher;E. Machado;I Mandić;N. Manthos;G. Marel;V. E. Markushin;M. Mikuž;J. Miller;F. Montanet;A. Müller;T. Nakada;B. Pagels;I. Papadopoulos;P. Pavlopoulos;J. Pinto Da Cunha;A. Policarpo;G. Polivka;R. Rickenbach;B. L. Roberts;T. Ruf;L. Sakeliou;P. Sanders;M. Schäfer;L. A. Schaller;T. Schietinger;A. Schopper;A. Soares;L. Tauscher;C. Thibault;F. Touchard;C. Touramanis;F. Triantis;E. Van Beveren;C. W. E. Van Eijk;S. Vlachos;P. Weber;O. Wigger;M. Wolter;C. Yèche;D. Zavrtanik;D. Zimmerman;
the european physical journal c 1998 Vol. 1 pp. 139-148
108
zimmerman1998thedirect

Abstract

We study ππ correlations in the exclusive reaction pp → 2π+2π− at rest measured by the CPLEAR experiment. Avoiding the introduction of an arbitrary reference sample, we analyse differential distributions for equal charge pion pairs removing the phase-space factor event by event. A peak at small relative momenta is most pronounced for large total momentum of the pair. The physical implications of bosonic symmetrization for the properties of the pion source, in particular its radius, are briefly discussed. The two extremes considered are the chaotic Hanbury-Brown-Twiss mechanism and the coherent Skyrmion model.

Keywords

invariant mass bose einstein pion pair differential density pion source

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DOI:
10.1007/bf01245804
URL:
https://sciprofiles.com/publication/view/68cb3bad1...

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ID: 271787
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