Measurements of the (anti)p-D annihilation at rest

Ableev, V. G.; Agnello, M.; Balestra, F.; Bendiscioli, G.; Bertin, A.; Boccaccio, P.; Botta, E.; Bressani, T.; Bruschi, M.; Bussa, M. P.; Busso, L.; Calvo, D.; Capponi, M.; Cereda, B.; Cerello, P.; Cicaló, C.; Costa, S.; De Castro, S.; Denisov, O. Y. u.; D'Isep, D.; Donzella, A.; Fava, L.; Feliciello, A.; Ferrero, L.; Filippi, A.; Filippini, V.; Fontana, A.; Galli, D.; Garfagnini, R.; Gastaldi, U.; Giacobbe, B.; Gianotti, P.; Gorchakov, O. E.; Grasso, A.; Guaraldo, C.; Iazzi, F.; Lanaro, A.; Lodi Rizzini, E.; Lombardi, M.; Lucherini, V.; Maggiora, A.; Maneva, G.; Marcello, S.; Marconi, U.; Margagliotti, Giacomo; Maron, G.; Masoni, A.; Minetti, B.; Montagna, P.; Morando, M.; Nichitiu, F.; Panzieri, D.; Pauli, G.; Piccinini, M.; Poli, M.; Prakhov, S. N.; Puddu, G.; Ricci, R. A.; Rossetto, E.; Rotondi, A.; Roshdestvensky, A. M.; Saino, A.; Salvini, P.; Santi, L.; Sapozhnikov, M. G.; Semprini Cesari, N.; Serci, S.; Spighi, R.; Temnikov, P. P.; Tessaro, S.; Tosello, F.; Tretyak, V. I.; Usai, G.; Vannucci, L.; Vecchi, S.; Vedovato, G.; Venturelli, L.; Villa, M.; Vitale, A.; Zenoni, A.; Zoccoli, A.; Zosi, G.

doi:10.1016/0375-9474(94)00523-P

The measurement of different reactions of (p) over bar d annihilation at rest in a gaseous target has been performed using the OBELIX spectrometer at LEAR (CERN). A strong deviation from the OZI-rule prediction was found from the measurement of the ratio R = phi pi/omega pi in two regions of proton momenta, P < 200 MeV/c and P > 400 MeV/c: R(phi pi(-)/omega pi(-)) = (133 +/- 26) x 10(-3) and (113 +/- 30)x 10(-3), respectively. These values are about 30 times greater than the theoretical prediction. For the first time the excitation of the Delta-resonance was observed among the final-state products of (p) over bar d annihilation. The existence of a broad enhancement in the 4 pi invariant mass at m approximate to 1480 MeV, seen in previous experiments, was confirmed. A approximate to 100 MeV downward shift of the bump position, when the proton momentum increased up to P > 400 MeV/c, was also observed, while the positions of omega, rho and f(2)(1270) did not change with the proton momentum.

Titolo:	Measurements of the (anti)p-D annihilation at rest
Autori:	V. G. Ableev M. Agnello F. Balestra G. Bendiscioli A. Bertin P. Boccaccio E. Botta T. Bressani M. Bruschi M. P. Bussa L. Busso D. Calvo M. Capponi B. Cereda P. Cerello C. Cicaló S. Costa S. De Castro O. Y.u. Denisov D. D'Isep A. Donzella L. Fava A. Feliciello L. Ferrero A. Filippi V. Filippini A. Fontana D. Galli R. Garfagnini U. Gastaldi B. Giacobbe P. Gianotti O. E. Gorchakov A. Grasso C. Guaraldo F. Iazzi A. Lanaro E. Lodi Rizzini M. Lombardi V. Lucherini A. Maggiora G. Maneva S. Marcello U. Marconi MARGAGLIOTTI, GIACOMO G. Maron A. Masoni B. Minetti P. Montagna M. Morando F. Nichitiu D. Panzieri G. Pauli M. Piccinini M. Poli S. N. Prakhov G. Puddu R. A. Ricci E. Rossetto A. Rotondi A. M. Roshdestvensky A. Saino P. Salvini L. Santi M. G. Sapozhnikov N. Semprini Cesari S. Serci R. Spighi P. P. Temnikov S. Tessaro F. Tosello V. I. Tretyak G. Usai L. Vannucci S. Vecchi G. Vedovato L. Venturelli M. Villa A. Vitale A. Zenoni A. Zoccoli G. Zosi mostra contributor esterni nascondi contributor esterni
Data di pubblicazione:	1995
Rivista:	NUCLEAR PHYSICS. A
Abstract:	The measurement of different reactions of (p) over bar d annihilation at rest in a gaseous target has been performed using the OBELIX spectrometer at LEAR (CERN). A strong deviation from the OZI-rule prediction was found from the measurement of the ratio R = phi pi/omega pi in two regions of proton momenta, P < 200 MeV/c and P > 400 MeV/c: R(phi pi(-)/omega pi(-)) = (133 +/- 26) x 10(-3) and (113 +/- 30)x 10(-3), respectively. These values are about 30 times greater than the theoretical prediction. For the first time the excitation of the Delta-resonance was observed among the final-state products of (p) over bar d annihilation. The existence of a broad enhancement in the 4 pi invariant mass at m approximate to 1480 MeV, seen in previous experiments, was confirmed. A approximate to 100 MeV downward shift of the bump position, when the proton momentum increased up to P > 400 MeV/c, was also observed, while the positions of omega, rho and f(2)(1270) did not change with the proton momentum.
Handle:	http://hdl.handle.net/11368/2634813
Digital Object Identifier (DOI):	http://dx.doi.org/10.1016/0375-9474(94)00523-P
Appare nelle tipologie:	1.1 Articolo in Rivista

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