New FOCUS results on charm mixing and CP violation

Bianco, Stefano; Link, J. M.; Paolone, V. S.; Reyes, M.; Yager, P. M.; Anjos, J. C.; Bediaga, I.; Gobel, C.; Magnin, J.; J. M., De; Pepe, I. M.; Dos, A. C.; Simao, F.; Carrillo, S.; Casimiro, E.; Mendez, H.; Sanchez Hernandez, A.; Uribe, C.; Vasquez, F.; Cinquini, L.; John, P.; Ramirez, J. E.; O'Reilly, B.; Vaandering, E. W.; Joel, N.; Cheung, H. W. K.; Gaines, I.; Garbincius, P. H.; Garren, L. A.; Edward, Erik; Gourlay, S. A.; Kasper, P. H.; Kreymer, A. E.; Robert, K.; Fabbri, F. L.; Sarwar, S.; Zallo, A.; Cawlfield, C.; Kim, D. Y.; Park, K. S.; Rahimi, A.; Wiss, J.; Gardner, R.; Chung, Y. S.; Kang, J. S.; B. R., Ko; Kwak, J. W.; Lee, K. B.; Myung, S. S.; Park, H.; Alimonti, G.; Boschini, M.; Brambilla, D.; Caccianiga, B.; Calandrino, A.; D'Angelo, P.; DiCorato, M.; Dini, P.; Giammarchi, M.; Inzani, P.; Leveraro, F.; Malvezzi, S.; Menasce, D.; Mezzadri, M.; Milazzo, L.; Moroni, L.; Pedrini, D.; Prelz, F.; Rovere, M.; Sala, A.; Sala, S.; Davenport, T. F.; Arena, Vincenzo; Boca, Gianluigi; Bonomi, G.; Gianini, G.; Liguori, Giuseppe; Merlo, M.; Pantea, D.; Ratti, Sergio Peppino; Riccardi, Cristina; Torre, Paola; Viola, L.; Vitulo, Paolo; Hernandez, H.; Lopez, A. M.; Mendez, L.; Mirles, A.; Montiel, E.; Olaya, D.; Quinones, J.; Rivera, C.; Zhang, Y.; Copty, N.; Purohit, M.; Wilson, J. R.; Cho, K.; Handler, T.; Engh, D.; Johns, W. E.; Galen, Michael; Nehring, M. S.; Sales, M.; Sheldon, P. D.; Stenson, K.; Webster, M. S.; Sheaff, M.; Kwon, Y.

We present a summary of recent results on CP violation and mixing in the charm quark sector based on a high statistics sample collected by photoproduction experiment FOCUS (E831 at Fermilab). We have measured the difference in lifetimes for the D0 decays: D0 --> K-pi+ and D0 --> K-K+ . This translates into a measurement of the y_cp mixing parameter in the D0/D0bar system, under the assumptions that K+K- is an equal mixture of CP odd and CP even eigenstates, and CP violation is negligible in the neutral charm meson system. We verified the latter assumption by searching for a CP violating asymmetry in the Cabibbo suppressed decay modes D+ --> K-K+pi+ , D0 --> K-K+ and D0 --> pi-pi+ . We show preliminary results on a measurement of the branching ratio Gamma(D*+ --> pi+(K+pi-))/Gamma(D*+ --> pi+(K-pi+)).

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Titolo:	New FOCUS results on charm mixing and CP violation
Autori:	Bianco Stefano Link J. M. Paolone V. S. Reyes M. Yager P. M. Anjos J. C. Bediaga I. Gobel C. Magnin J. de J. M. Pepe I. M. dos A. C. Simao F. Carrillo S. Casimiro E. Mendez H. Sanchez Hernandez A. Uribe C. Vasquez F. Cinquini L. P. John Ramirez J. E. O'Reilly B. Vaandering E. W. N. Joel Cheung H. W. K. Gaines I. Garbincius P. H. Garren L. A. Edward Erik Gourlay S. A. Kasper P. H. Kreymer A. E. K. Robert Fabbri F. L. Sarwar S. Zallo A. Cawlfield C. Kim D. Y. Park K. S. Rahimi A. Wiss J. Gardner R. Chung Y. S. Kang J. S. Ko B. R. Kwak J. W. Lee K. B. Myung S. S. Park H. Alimonti G. Boschini M. Brambilla D. Caccianiga B. Calandrino A. D'Angelo P. DiCorato M. Dini P. Giammarchi M. Inzani P. Leveraro F. Malvezzi S. Menasce D. Mezzadri M. Milazzo L. Moroni L. Pedrini D. Prelz F. Rovere M. Sala A. Sala S. Davenport T. F. ARENA, VINCENZO BOCA, GIANLUIGI Bonomi G. Gianini G. LIGUORI, GIUSEPPE Merlo M. Pantea D. RATTI, SERGIO PEPPINO RICCARDI, CRISTINA TORRE, PAOLA Viola L. VITULO, PAOLO Hernandez H. Lopez A. M. Mendez L. Mirles A. Montiel E. Olaya D. Quinones J. Rivera C. Zhang Y. Copty N. Purohit M. Wilson J. R. Cho K. Handler T. Engh D. Johns W. E. Galen Michael Nehring M. S. Sales M. Sheldon P. D. Stenson K. Webster M. S. Sheaff M. Kwon Y. mostra contributor esterni nascondi contributor esterni
Data di pubblicazione:	2000
Rivista:	NUCLEAR PHYSICS B - PROCEEDINGS SUPPLEMENTS
Abstract:	We present a summary of recent results on CP violation and mixing in the charm quark sector based on a high statistics sample collected by photoproduction experiment FOCUS (E831 at Fermilab). We have measured the difference in lifetimes for the D0 decays: D0 --> K-pi+ and D0 --> K-K+ . This translates into a measurement of the y_cp mixing parameter in the D0/D0bar system, under the assumptions that K+K- is an equal mixture of CP odd and CP even eigenstates, and CP violation is negligible in the neutral charm meson system. We verified the latter assumption by searching for a CP violating asymmetry in the Cabibbo suppressed decay modes D+ --> K-K+pi+ , D0 --> K-K+ and D0 --> pi-pi+ . We show preliminary results on a measurement of the branching ratio Gamma(D+ --> pi+(K+pi-))/Gamma(D+ --> pi+(K-pi+)).
Handle:	http://hdl.handle.net/11571/460655
Appare nelle tipologie:	4.1 Contributo in Atti di convegno

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