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Title: Charm Baryon Studies at BABAR

Abstract

We present a precision measurement of the mass of the {lambda}{sub c}{sup +} and studies of the production and decay of the {omega}{sub c}{sup 0} and {xi}{sub c}{sup 0} charm baryons using data collected by the BABAR experiment. To keep the systematic uncertainty as low as possible, the {lambda}{sub c}{sup +} mass measurement is performed using the low Q-value decays, {lambda}{sub c}{sup +} {yields} {lambda}{sup 0}K{sub S}{sup 0}K{sup +} and {lambda}{sub c}{sup +} {yields} {sigma}{sup 0}K{sub S}{sup 0}K{sup +}. Several hadronic final states involving an {omega}- and a {xi}- hyperon are analyzed to reconstruct the {xi}{sub c}{sup 0} and the {omega}{sub c}{sup 0}.

Authors:
 [1]
  1. Dept. of Physics and Astronomy, University of Iowa, 203 VAN, Iowa City, IA 52242 (United States)
Publication Date:
OSTI Identifier:
20798081
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 814; Journal Issue: 1; Conference: 11. international conference on hadron spectroscopy, Rio de Janeiro (Brazil), 21-26 Aug 2005; Other Information: DOI: 10.1063/1.2176494; (c) 2006 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ACCURACY; ELECTRON-POSITRON INTERACTIONS; HADRONIC PARTICLE DECAY; LAMBDA BARYONS; LAMBDA C PLUS BARYONS; MULTIPARTICLE SPECTROMETERS; OMEGA BARYONS; PARTICLE IDENTIFICATION; PEP STORAGE RINGS; Q-VALUE; REST MASS; XI BARYONS; XI C NEUTRAL BARYONS

Citation Formats

Ziegler, Veronique. Charm Baryon Studies at BABAR. United States: N. p., 2006. Web. doi:10.1063/1.2176494.
Ziegler, Veronique. Charm Baryon Studies at BABAR. United States. doi:10.1063/1.2176494.
Ziegler, Veronique. Sat . "Charm Baryon Studies at BABAR". United States. doi:10.1063/1.2176494.
@article{osti_20798081,
title = {Charm Baryon Studies at BABAR},
author = {Ziegler, Veronique},
abstractNote = {We present a precision measurement of the mass of the {lambda}{sub c}{sup +} and studies of the production and decay of the {omega}{sub c}{sup 0} and {xi}{sub c}{sup 0} charm baryons using data collected by the BABAR experiment. To keep the systematic uncertainty as low as possible, the {lambda}{sub c}{sup +} mass measurement is performed using the low Q-value decays, {lambda}{sub c}{sup +} {yields} {lambda}{sup 0}K{sub S}{sup 0}K{sup +} and {lambda}{sub c}{sup +} {yields} {sigma}{sup 0}K{sub S}{sup 0}K{sup +}. Several hadronic final states involving an {omega}- and a {xi}- hyperon are analyzed to reconstruct the {xi}{sub c}{sup 0} and the {omega}{sub c}{sup 0}.},
doi = {10.1063/1.2176494},
journal = {AIP Conference Proceedings},
number = 1,
volume = 814,
place = {United States},
year = {Sat Feb 11 00:00:00 EST 2006},
month = {Sat Feb 11 00:00:00 EST 2006}
}
  • We present experimental results from the BaBar experiment on charm baryon spectroscopy and production studies, including studies of excited cascades produced in charm baryon decays. We review the discovery of new decay modes of known states and searches for predicted states.
  • The authors present a precision measurement of the mass of the {Lambda}{sub c}{sup +} and studies of the production and decay of the {Omega}{sub c}{sup 0} and {Xi}{sub c}{sup 0} charm baryons using data collected by the BABAR experiment. To keep the systematic uncertainty as low as possible, the {Lambda}{sub c}{sup +} mass measurement is performed using the low Q-value decays, {Lambda}{sub c}{sup +} {yields} {Lambda}{sup 0} K{sub S}{sup 0}K{sup +} and {Lambda}{sub c}{sup +} {yields} {Sigma}{sup 0} K{sub S}{sup 0}K{sup +}. Several hadronic final states involving an {Omega}{sup -} and a {Xi}{sup -} hyperon are analyzed to reconstruct themore » {Xi}{sub c}{sup 0} and the {Omega}{sub c}{sup 0}.« less
  • We have carried out a search for a charmed baryon Ωmore » $$*\atop{c}$$ decaying to Ω$$0\atop{c}$$ and a γ where Ω c candidates are reconstructed using decay modes Ω -π +(c1), Ω -π +π 0(c2), Ω -π +π -π +(c3) and Ξ -K -π +π +(c4). This search is performed by analyzing integrated luminosity of 230.7 fb -1 data collected by the BABAR detector at the Stanford Linear Accelerator Center. In decay channel Ω$$*\atop{c}$$ → Ω$$0\atop{c}$$(Ω -π +)γ (C1), we observe a signal yield of 39.2$$+9.8\atop{-9.1}$$ (stat)±6.0(syst) events with a significance of 4.2 standard deviations. In decay channels Ω$$*\atop{c}$$ → Ω$$0\atop{c}$$(Ω -π +π 0)γ (C2) and Ω$$*\atop{c}$$ →} Ω$$0\atop{c}$$(Ξ -K -π +π +)γ (C4), we observe signal yields of 55.2$$+16.1\atop{-15.2}$$ ± 5.6 and 20.2$$+9.3\atop{-8.5}$$ ± 3.1 with significances of 3.4 and 2.0 σ, respectively. As for the Ω$$*\atop{c}$$ → Ω$$0\atop{c}$$(Ω -π +π -π +)γ (C3) decay channel, we observe signal yields of -5.1$$+5.3.8\atop{-4.7}$$±1.0 without a positive significance. We assume the same production mechanism for the four decay channels of Ω$$*\atop{c}$$ studied. By combining these four channels, the fit results in a signal yield of 105.3$$+21.2\atop{-20.5}$$± 6.0 events with a significance of 5.2 σ. We report the mass difference Ω$$*\atop{c}$$ - Ω$$0\atop{c}$$(δm) of the singly charmed baryon Ω$$*\atop{c}$$ to be 70.8$$+1.0\atop{-1.0}$$±1.1 MeV. Finally, the ratios of production cross sections are calculated: σ(e +e -→C1)/σ(e +e -→c1) = 0.71$$+0.19\atop{-0.18}$$±0.11, σ(e +e -→C2)/σ(e +e -→c2) = 1.76$$+0.71\atop{-0.69}$$±0.19, σ(e +e -→C3)/σ(e +e -→c3) = -0.66$$+0.74\atop{-0.66}$$±0.13, σ(e +e -→C4)/σ(e +e -→c4) = 1.70{sup +1.0}{sub -1.0}±0.27 and σ(e +e -→Ω$$*\atop{c}$$ (combined))/σ(e +e -→Ω$$0\atop{c}$$) = 1.0$$+0.23\atop{-0.22}$$±0.11.« less
  • Dalitz plot analyses of D{sup 0} events reconstructed for the hadronic decay D{sup 0} {yields} {bar K}{sup 0}K{sup +}K{sup -} and D{sup 0} {yields} {bar K}{sup 0}{pi}{sup +}{pi}{sup -} are presented here. The analyses are based on a data sample of 91.5 fb{sup -1}. All data have been collected with the BABAR detector at the PEP-II asymmetric-energy e{sup +}e{sup -} storage rings at SLAC running at center-of-mass energies on and 40 MeV below the {Upsilon}(4S) resonance.
  • Recent results from leptonic and semi-leptonic charm decays at the BABAR B-factory are presented. The measurement of f{sub D{sub s}} from the D{sub s}{sup +} {yields} {mu}{sup +}{nu} channel is presented. Form-factor studies from the D{sup 0} {yields} K{sup +}e{sup -}{bar {nu}}{sub e} channel are described along with a search for flavor-changing neutral-current X{sub c}{sup +} {yields} h{sup +}{ell}{sup +}{ell}{prime}{sup -} decays.