1. Direct determination of two-pion correlations for $\overline{p}p \to 2\pi^{+}2\pi^{-}$ annihilation at rest
- Author
-
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., 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, and 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)
- Subjects
Nuclear Theory ,[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex] ,Nuclear Experiment - Abstract
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.
- Published
- 1998