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Title: Study of Decay Mechanisms in B{sup -}{yields}{lambda}{sub c}{sup +}p{pi}{sup -} Decays and Observation of Low-Mass Structure in the {lambda}{sub c}{sup +}p System

Abstract

Using a sample of 152x10{sup 6} BB pairs accumulated with the Belle detector at the KEKB e{sup +}e{sup -} collider, we study the decay mechanism of three-body charmed decay B{sup -}{yields}{lambda}{sub c}{sup +}p{pi}{sup -}. The intermediate two-body decay B{sup -}{yields}{sigma}{sub c}(2455){sup 0}p is observed for the first time with a branching fraction of (3.7{+-}0.7{+-}0.4{+-}1.0)x10{sup -5} and a statistical significance of 8.4{sigma}. We also observe a low-mass enhancement in the ({lambda}{sub c}{sup +}p) system, which can be parametrized as a Breit-Wigner function with a mass of (3.35{sub -0.02}{sup +0.01}{+-}0.02) GeV/c{sup 2} and a width of (0.07{sub -0.03}{sup +0.04}{+-}0.04) GeV/c{sup 2}. We measure its branching fraction to be (3.9{sub -0.7}{sup +0.8}{+-}0.4{+-}1.0)x10{sup -5} with a statistical significance of 6.2{sigma}. The errors are statistical, systematic, and that of the {lambda}{sub c}{sup +}{yields}pK{sup -}{pi}{sup +} decay branching fraction.

Authors:
; ; ; ; ; ; ;  [1]; ; ; ; ; ; ; ; ; ; ; ;  [2]
  1. Budker Institute of Nuclear Physics, Novosibirsk (Russian Federation)
  2. High Energy Accelerator Research Organization (KEK), Tsukuba (Japan) (and others)
Publication Date:
OSTI Identifier:
20861471
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review Letters; Journal Volume: 97; Journal Issue: 24; Other Information: DOI: 10.1103/PhysRevLett.97.242001; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; B MINUS MESONS; BRANCHING RATIO; BREIT-WIGNER FORMULA; ERRORS; FUNCTIONS; GEV RANGE 01-10; LAMBDA C PLUS BARYONS; MASS; PARTICLE DECAY; PARTICLE PRODUCTION; PARTICLE WIDTHS; PIONS MINUS; PIONS PLUS; PROTONS; THREE-BODY PROBLEM; TWO-BODY PROBLEM

Citation Formats

Gabyshev, N., Aulchenko, V., Bondar, A., Eidelman, S., Krokovny, P., Kuzmin, A., Sidorov, V., Zhilich, V., Abe, K., Adachi, I., Gershon, T., Hazumi, M., Ishikawa, A., Itoh, R., Iwasaki, Y., Katayama, N., Kichimi, H., Nakao, M., Nakazawa, H., and Nishida, S. Study of Decay Mechanisms in B{sup -}{yields}{lambda}{sub c}{sup +}p{pi}{sup -} Decays and Observation of Low-Mass Structure in the {lambda}{sub c}{sup +}p System. United States: N. p., 2006. Web. doi:10.1103/PHYSREVLETT.97.242001.
Gabyshev, N., Aulchenko, V., Bondar, A., Eidelman, S., Krokovny, P., Kuzmin, A., Sidorov, V., Zhilich, V., Abe, K., Adachi, I., Gershon, T., Hazumi, M., Ishikawa, A., Itoh, R., Iwasaki, Y., Katayama, N., Kichimi, H., Nakao, M., Nakazawa, H., & Nishida, S. Study of Decay Mechanisms in B{sup -}{yields}{lambda}{sub c}{sup +}p{pi}{sup -} Decays and Observation of Low-Mass Structure in the {lambda}{sub c}{sup +}p System. United States. doi:10.1103/PHYSREVLETT.97.242001.
Gabyshev, N., Aulchenko, V., Bondar, A., Eidelman, S., Krokovny, P., Kuzmin, A., Sidorov, V., Zhilich, V., Abe, K., Adachi, I., Gershon, T., Hazumi, M., Ishikawa, A., Itoh, R., Iwasaki, Y., Katayama, N., Kichimi, H., Nakao, M., Nakazawa, H., and Nishida, S. Fri . "Study of Decay Mechanisms in B{sup -}{yields}{lambda}{sub c}{sup +}p{pi}{sup -} Decays and Observation of Low-Mass Structure in the {lambda}{sub c}{sup +}p System". United States. doi:10.1103/PHYSREVLETT.97.242001.
@article{osti_20861471,
title = {Study of Decay Mechanisms in B{sup -}{yields}{lambda}{sub c}{sup +}p{pi}{sup -} Decays and Observation of Low-Mass Structure in the {lambda}{sub c}{sup +}p System},
author = {Gabyshev, N. and Aulchenko, V. and Bondar, A. and Eidelman, S. and Krokovny, P. and Kuzmin, A. and Sidorov, V. and Zhilich, V. and Abe, K. and Adachi, I. and Gershon, T. and Hazumi, M. and Ishikawa, A. and Itoh, R. and Iwasaki, Y. and Katayama, N. and Kichimi, H. and Nakao, M. and Nakazawa, H. and Nishida, S.},
abstractNote = {Using a sample of 152x10{sup 6} BB pairs accumulated with the Belle detector at the KEKB e{sup +}e{sup -} collider, we study the decay mechanism of three-body charmed decay B{sup -}{yields}{lambda}{sub c}{sup +}p{pi}{sup -}. The intermediate two-body decay B{sup -}{yields}{sigma}{sub c}(2455){sup 0}p is observed for the first time with a branching fraction of (3.7{+-}0.7{+-}0.4{+-}1.0)x10{sup -5} and a statistical significance of 8.4{sigma}. We also observe a low-mass enhancement in the ({lambda}{sub c}{sup +}p) system, which can be parametrized as a Breit-Wigner function with a mass of (3.35{sub -0.02}{sup +0.01}{+-}0.02) GeV/c{sup 2} and a width of (0.07{sub -0.03}{sup +0.04}{+-}0.04) GeV/c{sup 2}. We measure its branching fraction to be (3.9{sub -0.7}{sup +0.8}{+-}0.4{+-}1.0)x10{sup -5} with a statistical significance of 6.2{sigma}. The errors are statistical, systematic, and that of the {lambda}{sub c}{sup +}{yields}pK{sup -}{pi}{sup +} decay branching fraction.},
doi = {10.1103/PHYSREVLETT.97.242001},
journal = {Physical Review Letters},
number = 24,
volume = 97,
place = {United States},
year = {Fri Dec 15 00:00:00 EST 2006},
month = {Fri Dec 15 00:00:00 EST 2006}
}