skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Anticharmed Pentaquark from B Decays

Abstract

We explore the possibility of observing the anticharmed pentaquark state from the {theta}{sub c}n{pi}{sup +} decay of B mesons produced in B-factory experiments. We first show that the observed branching ratio of the B{sup +} to {lambda}{sub c}{sup -}p{pi}{sup +}, as well as its open histograms, can be remarkably well explained by assuming that the decay proceeds first through the {pi}{sup +}D{sup 0} (or D*{sup 0}) decay, and then through the subsequent decay of the virtual D{sup 0} or D*{sup 0} mesons to {lambda}{sub c}{sup -}p. We then note that the {theta}{sub c} can be similarly produced when the virtual D{sup 0} or D*{sup 0} decay into an antinucleon and a {theta}{sub c}. Combining the present theoretical estimates for the ratio g{sub DN{lambda}{sub c}}/g{sub DN{theta}{sub c}}{approx}13 and g{sub D*N{theta}{sub c}}{approx}(1/3)g{sub DN{theta}{sub c}}, we find that the anticharmed pentaquark {theta}{sub c}, which was predicted to be bound by several model calculations, can be produced via B{sup +}{yields}{theta}{sub c}n{pi}{sup +}, and be observed from the B-factory experiments through the weak decay of {theta}{sub c}{yields}pK{sup +}{pi}{sup -}{pi}{sup -}.

Authors:
; ;  [1]
  1. Institute of Physics and Applied Physics, Yonsei University, Seoul 120-749 (Korea, Republic of)
Publication Date:
OSTI Identifier:
20778797
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review Letters; Journal Volume: 96; Journal Issue: 10; Other Information: DOI: 10.1103/PhysRevLett.96.102001; (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 PLUS MESONS; BRANCHING RATIO; D NEUTRAL MESONS; HADRONIC PARTICLE DECAY; HYPERONS; KAONS PLUS; LAMBDA C PLUS BARYONS; PAIR PRODUCTION; PIONS MINUS; PIONS PLUS

Citation Formats

Lee, Su Houng, Kwon, Youngshin, and Kwon, Youngjoon. Anticharmed Pentaquark from B Decays. United States: N. p., 2006. Web. doi:10.1103/PHYSREVLETT.96.1.
Lee, Su Houng, Kwon, Youngshin, & Kwon, Youngjoon. Anticharmed Pentaquark from B Decays. United States. doi:10.1103/PHYSREVLETT.96.1.
Lee, Su Houng, Kwon, Youngshin, and Kwon, Youngjoon. Fri . "Anticharmed Pentaquark from B Decays". United States. doi:10.1103/PHYSREVLETT.96.1.
@article{osti_20778797,
title = {Anticharmed Pentaquark from B Decays},
author = {Lee, Su Houng and Kwon, Youngshin and Kwon, Youngjoon},
abstractNote = {We explore the possibility of observing the anticharmed pentaquark state from the {theta}{sub c}n{pi}{sup +} decay of B mesons produced in B-factory experiments. We first show that the observed branching ratio of the B{sup +} to {lambda}{sub c}{sup -}p{pi}{sup +}, as well as its open histograms, can be remarkably well explained by assuming that the decay proceeds first through the {pi}{sup +}D{sup 0} (or D*{sup 0}) decay, and then through the subsequent decay of the virtual D{sup 0} or D*{sup 0} mesons to {lambda}{sub c}{sup -}p. We then note that the {theta}{sub c} can be similarly produced when the virtual D{sup 0} or D*{sup 0} decay into an antinucleon and a {theta}{sub c}. Combining the present theoretical estimates for the ratio g{sub DN{lambda}{sub c}}/g{sub DN{theta}{sub c}}{approx}13 and g{sub D*N{theta}{sub c}}{approx}(1/3)g{sub DN{theta}{sub c}}, we find that the anticharmed pentaquark {theta}{sub c}, which was predicted to be bound by several model calculations, can be produced via B{sup +}{yields}{theta}{sub c}n{pi}{sup +}, and be observed from the B-factory experiments through the weak decay of {theta}{sub c}{yields}pK{sup +}{pi}{sup -}{pi}{sup -}.},
doi = {10.1103/PHYSREVLETT.96.1},
journal = {Physical Review Letters},
number = 10,
volume = 96,
place = {United States},
year = {Fri Mar 17 00:00:00 EST 2006},
month = {Fri Mar 17 00:00:00 EST 2006}
}
  • Assuming that the recently observed {Theta}{sup +} and {Xi}{sup --} are members of an anti-decuplet of SU(3), decays to ground state baryons and mesons are calculated using an effective Lagrangian which incorporates chiral and SU(3) symmetry. We consider the possible quantum number assignments J{sup {Pi}} = 1/2 {sup {+-}} {center_dot} 3/2 {sup {+-}} and calculate ratios of partial widths. The branching ratios of exotic cascades can be used to discriminate between even and odd parity pentaquarks.
  • Using a sample of 9.6x10{sup 6}BB(bar sign) meson pairs collected with the CLEO detector, we have fully reconstructed 135 B{sup 0}{yields}{psi}{sup (')} K{sub S}{sup 0} and 526 B{sup +}{yields}{psi}{sup (')}K{sup +} candidates with very low background. We fitted the {psi}{sup (')}K invariant mass distributions of these B meson candidates and measured the masses of the neutral and charged B mesons to be M(B{sup 0})=5279.1{+-}0.7[stat]{+-}0.3[ syst] MeV/c{sup 2} and M(B{sup +})=5279.1{+-}0.4[stat]{+-}0.4[ syst] MeV/c{sup 2}. The precision is a significant improvement over previous measurements. (c) 2000 The American Physical Society.
  • With accumulation of high statistics data at BESIII, one may study many new interesting channels. Among them, J/{psi}{yields}B{sup *}B+B{sup *}B{yields}{gamma}BB processes may provide valuable information of the radiative decays of the excited baryons B{sup *}(N{sup *},{Lambda}{sup *},{Sigma}{sup *},{Xi}{sup *}), and may shed light on their internal quark-gluon structure. Our estimation for the branching ratios of the nucleon excitations N{sup *}(1440), N{sup *}(1535) and N{sup *}(1520) from the reaction J/{psi}{yields}N{sup *}p+N{sup *}p{yields}pp{gamma}, indicates that these processes can be studied at BESIII with 10{sup 10}J/{psi} events. Explicit theoretical formulas for the partial wave analysis (PWA) of the J/{psi}{yields}B{sup *}B+B{sup *}B with B{supmore » *{yields}}B{gamma} and B{sup *{yields}}B{gamma} within covariant L-S Scheme are provided.« less
  • A study of the decays Bs0→μ+μ- and B 0 → μ + μ - has been performed using data corresponding to an integrated luminosity of 25 fb - 1 of 7 and 8 TeV proton–proton collisions collected with the ATLAS detector during the LHC Run 1. For the B 0 dimuon decay, an upper limit on the branching fraction is set at B(B 0 → μ + μ - ) < 4.2 × 10 - 10 at 95 % confidence level. For Bs0, the branching fraction B(Bs0→μ+μ-)=(0.9-0.8+1.1)×10-9 is measured. The results are consistent with the Standard Model expectation with a p valuemore » of 4.8 %, corresponding to 2.0 standard deviations.« less
  • No abstract prepared.