Direct determination of two-pion correlations for $\overline{p}p \to 2\pi^{+}2\pi^{-}$ annihilation at rest

Autor: Angelopoulos, A., Apostolakis, A., Aslanides, E., Backenstoss, G., Behnke, O., Benelli, A., Bertin, V., Blanc, F., Bloch, P., Carlson, P., Carvalho, J., Cawley, E., Charalambous, S., Chardin, G., Chertok, M B., Cody, A., Danielsson, M., Dejardin, M., Derre, J., Ealet, A., Eleftheriadis, C., Evangelou, I., Faravel, L., Ferreira-Marques, R., Fetscher, W., Fidecaro, M., Filipcic, A., Francis, D., Fry, J., Gabathuler, E., Gamet, R., Garreta, D., Gerberh, J., Go, A., Haselden, A., Hayman, P J., Henry-Couannier, F., Hollander, R W., Hubert, E., Jon-And, K., Kettle, P R., Kokkas, P., Kreuger, R., Le Gac, R., Leimgruber, F., Liolios, A., Locher, M.P., Machado, E., Mandic, I., Manthos, N., Marel, G., Markushin, V.E., Mikuz, M., Miller, J., Montanet, F., Müller, A., Nakada, T., Pagels, B., Papadopoulos, I., Pavlopoulos, P., Pinto da Cunha, J., Policarpo, A., Polivka, G., Rickenbach, R., Roberts, B L., Ruf, T., Sakeliou, L., Sanders, P., Schafer, M., Schaller, L A., Schietinger, T., Schopper, A., Soares, A., Tauscher, L., Thibault, C., Touchard, F., Touramanis, C., Triantis, F., van Beveren, E., van Eijk, C We., Vlachos, S., Weber, P., Wigger, O., Wolter, M., Yeche, Ch., Zavrtanik, D., Zimmerman, D.
Přispěvatelé: Centre de Physique des Particules de Marseille (CPPM), Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), CPLEAR, Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)
Jazyk: angličtina
Rok vydání: 1998
Předmět:
Zdroj: European Physical Journal C: Particles and Fields
European Physical Journal C: Particles and Fields, Springer Verlag (Germany), 1998, 1, pp.139-148
European Physical Journal C: Particles and Fields, 1998, 1, pp.139-148
ISSN: 1434-6044
1434-6052
Popis: We study $\pi\pi$ correlations in the exclusive reaction $\ppb \to 2\pi^+2\pi^-$ 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.
Databáze: OpenAIRE
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