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Title: SELEX: Recent Progress in the Analysis of Charm-Strange and Double-Charm Baryons

Abstract

SELEX (Fermilab Experiment 781) [1] employs beams of {Sigma}{sup -}, {pi}{sup -}, and protons at around 600 GeV/c to study production and decay properties of charmed baryons. It took data in the 1996/7 fixed target run and is currently analyzing those data. Here they focus on recently obtained results concerning the {Omega}{sub c}{sup 0} lifetime and the doubly-charmed baryons {Xi}{sub cc}{sup +} and {Xi}{sub cc}{sup ++}.

Authors:
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
OSTI Identifier:
899996
Report Number(s):
HQL-2006-003
TRN: US0702126
DOE Contract Number:
AC02-07CH11359
Resource Type:
Conference
Resource Relation:
Conference: To appear in the proceedings of: International Conference on Heavy Quarks and Leptons (HQL 06). Munich, Germany, 16-20 Oct 2006.
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; BARYONS; CHARMED BARYONS; DECAY; FERMILAB; LIFETIME; PRODUCTION; PROTONS; TARGETS

Citation Formats

Engelfried, Jurgen. SELEX: Recent Progress in the Analysis of Charm-Strange and Double-Charm Baryons. United States: N. p., 2007. Web.
Engelfried, Jurgen. SELEX: Recent Progress in the Analysis of Charm-Strange and Double-Charm Baryons. United States.
Engelfried, Jurgen. Thu . "SELEX: Recent Progress in the Analysis of Charm-Strange and Double-Charm Baryons". United States. doi:. https://www.osti.gov/servlets/purl/899996.
@article{osti_899996,
title = {SELEX: Recent Progress in the Analysis of Charm-Strange and Double-Charm Baryons},
author = {Engelfried, Jurgen},
abstractNote = {SELEX (Fermilab Experiment 781) [1] employs beams of {Sigma}{sup -}, {pi}{sup -}, and protons at around 600 GeV/c to study production and decay properties of charmed baryons. It took data in the 1996/7 fixed target run and is currently analyzing those data. Here they focus on recently obtained results concerning the {Omega}{sub c}{sup 0} lifetime and the doubly-charmed baryons {Xi}{sub cc}{sup +} and {Xi}{sub cc}{sup ++}.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Thu Feb 01 00:00:00 EST 2007},
month = {Thu Feb 01 00:00:00 EST 2007}
}

Conference:
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  • No abstract prepared.
  • In this dissertation I describe a study of double-charm and charm-strange baryons based on data collected with the BABAR Detector at the Stanford Linear Accelerator Center. In this study I search for new baryons and make precise measurements of their properties and decay modes. I seek to verify and expand upon double-charm and charm-strange baryon observations made by other experiments. The BABAR Detector is used to measure subatomic particles that are produced at the PEP-II storage rings. I analyze approximately 300 million e+e- {yields} c{bar c} events in a search for the production of double-charm baryons. I search for themore » double-charm baryons {Xi}{sup +}{sub cc} (containing the quarks ccd) and {Xi}{sup ++}{sub cc} (ccu) in decays to {Lambda}{sup +}{sub c}K{sup -}{pi}{sup +} and {Lambda}{sup +}{sub c}K{sup -}{pi}{sup +}{pi}{sup +}, respectively. No statistically significant signals for their production are found, and upper limits on their production are determined. Statistically significant signals for excited charm-strange baryons are observed with my analysis of approximately 500 million e+e- {yields} c{bar c} events. The charged charm-strange baryons {Xi}{sub c}(2970){sup +}, {Xi}{sub c}(3055){sup +}, {Xi}{sub c}(3123){sup +} are found in decays to {Lambda}{sup +}{sub c}K{sup -}{pi}{sup +}, the same decay mode used in the {Xi}{sup +}{sub cc} search. The neutral charm-strange baryon {Xi}{sub c}(3077){sup 0} is observed in decays to {Lambda}{sup +}{sub c}K{sub 8}{pi}{sup -}. I also search for excited charm-strange baryon decays to {Lambda}{sup +}{sub c}K{sub 8}, {Lambda}{sup +}{sub c}K{sup -}, {Lambda}{sup +}{sub c}K{sub 8}{pi}{sup -}{pi}{sup +}, and {Lambda}{sup +}{sub c}K{sup -}{pi}{sup -}{pi}{sup +}. No significant charm-strange baryon signals a f h these decay modes. For each excited charm-strange baryon state that I observe, I measure its mass, natural width (lifetime), and production rate. The properties of these excited charm-strange baryons and their decay modes provide constraints for phenomenological models of quark interactions through quantum chromodynamics. My discovery of the two new charm-strange baryons {Xi}{sub c}(3055){sup +} and {Xi}{sub c}(3123){sup +} influences our theoretical understanding of charm-strange baryon states.« less
  • Short communication.
  • The SELEX experiment (E781) at Fermilab has candidates for high mass states decaying to {Lambda}{sub c}{sup +}K{sup -}{pi}{sup +} and {Lambda}{sub c}{sup +}K{sup -} pi{sup +}{pi}{sup +}, Cabibbo-allowed decay modes of doubly-charmed baryons {Xi}{sub cc}{sup +} and {Xi}{sub cc}{sup ++}. The masses are consistent with theoretical considerations, but the spectroscopy is surprising. Limited lifetime information suggests that {tau}{sub {Xi}{sub cc}{sup ++}} {approx} {tau}{sub Xi}{sub cc}{sup +}.