Study of the decay asymmetry parameter and CP violation parameter in the Λc+ → Λπ+ decay

J. M. Link, P. M. Yager, J. C. Anjos, I. Bediaga, C. Castromonte, A. A. Machado, J. Magnin, A. Massafferri, J. M. De Miranda, I. M. Pepe, E. Polycarpo, A. C. Dos Reis, S. Carrillo, E. Casimiro, E. Cuautle, A. Sánchez-Hernández, C. Uribe, F. Vázquez, L. Agostino, L. CinquiniJ. P. Cumalat, B. O'Reilly, I. Segoni, K. Stenson, J. N. Butler, H. W.K. Cheung, G. Chiodini, I. Gaines, P. H. Garbincius, L. A. Garren, E. Gottschalk, P. H. Kasper, A. E. Kreymer, R. Kutschke, M. Wang, L. Benussi, M. Bertani, S. Bianco, F. L. Fabbri, S. Pacetti, A. Zallo, M. Reyes, C. Cawlfield, D. Y. Kim, A. Rahimi, J. Wiss, R. Gardner, A. Kryemadhi, Y. S. Chung, J. S. Kang, B. R. Ko, J. W. Kwak, K. B. Lee, K. Cho, H. Park, G. Alimonti, S. Barberis, M. Boschini, A. Cerutti, P. D'Angelo, M. DiCorato, P. Dini, L. Edera, S. Erba, P. Inzani, F. Leveraro, S. Malvezzi, D. Menasce, M. Mezzadri, L. Moroni, D. Pedrini, C. Pontoglio, F. Prelz, M. Rovere, S. Sala, T. F. Davenport, V. Arena, G. Boca, G. Bonomi, G. Gianini, G. Liguori, D. Lopes Pegna, M. M. Merlo, D. Pantea, S. P. Ratti, C. Riccardi, P. Vitulo, C. Göbel, J. Olatora, H. Hernandez, A. M. Lopez, H. Mendez, A. Paris, J. Quinones, J. E. Ramirez, Y. Zhang, J. R. Wilson, T. Handler, R. Mitchell, D. Engh, M. Hosack, W. E. Johns, E. Luiggi, J. E. Moore, M. Nehring, P. D. Sheldon, E. W. Vaandering, M. Webster, M. Sheaff

Research output: Contribution to journalArticlepeer-review

Abstract

Using data from the FOCUS (E831) experiment at Fermilab, we present a new measurement of the weak decay-asymmetry parameter αΛc in Λc+→Λπ+ decay. Comparing particle with antiparticle decays, we obtain the first measurement of the CP violation parameter A≡αΛcΛcΛcΛc. We obtain αΛc=-0.78±0.16±0.19 and A=-0.07±0.19±0.24 where errors are statistical and systematic.

Original languageEnglish (US)
Pages (from-to)165-172
Number of pages8
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume634
Issue number2-3
DOIs
StatePublished - Mar 9 2006
Externally publishedYes

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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