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New FOCUS results on charm mixing and CP violation.pdf

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New FOCUS results on charm mixing and CP violation

a r X i v : h e p - e x / 0 0 1 1 0 5 5 v 2 2 9 N o v 2 0 0 0 1 New FOCUS results on charm mixing and CP violation Stefano Bianco ? Laboratori Nazionali di Frascati dell’INFN - via E. Fermi 40, Frascati I-00044 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?π+ and D0 → K?K+. This translates into a measurement of the yCP mixing parameter in the D 0D?0 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 CP violating asymmetry in the Cabibbo suppressed decay modes D+ → K?K+π+, D0 → K?K+ and D0 → π?π+. We report preliminary results on a measurement of the branching ratio Γ(D?+ → π+(K+π?))/Γ(D?+ → π+(K?π+)). 1. INTRODUCTION Particle-antiparticle mixing in the charm sec- tor has distinctive features that make it a high sensitivity probe to search for New Physics. Re- ?on behalf of the FOCUS Collaboration. Coauthors are: J.M. Link, V.S. Paolone, M. Reyes, P.M. Yager (UC DAVIS); J.C. Anjos, I. Bediaga, C. Go?bel, J. Magnin, J.M. de Miranda, I.M. Pepe, A.C. dos Reis, F. Sima?o (CPBF, Rio de Janeiro); S. Carrillo, E. Casimiro, H. Mendez, A.Sa?nchez-Herna?ndez,, C. Uribe, F. Vasquez (CINVESTAV, Me?xico City); L. Cinquini, J.P. Cumalat, J.E. Ramirez, B. O’Reilly, E.W. Vaan- dering (CU Boulder); J.N. Butler, H.W.K. Cheung, I. Gaines, P.H. Garbincius, L.A. Garren, E. Gottschalk, S.A. Gourlay, P.H. Kasper, A.E. Kreymer, R. Kutschke (Fermilab); S. Bianco, F.L. Fabbri, S. Sarwar, A. Zallo (INFN Frascati); C. Cawlfield, D.Y. Kim, K.S. Park, A. Rahimi, J. Wiss (UI Champaign); R. Gardner (In- diana ); Y.S. Chung, J.S. Kang, B.R. Ko, J.W. Kwak, K.B. Lee, S.S. Myung, H. Park (Korea University, Seoul); G. Alimonti