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Study of B-Meson Decays to Final States with a Single Charm Baryon [electronic resource].

Published
Washington, D.C. : United States. Dept. of Energy, 2009.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description
208 pages : digital, PDF file
Additional Creators
Stanford Linear Accelerator Center, United States. Department of Energy, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
A study of B-meson decays to final states with a single charm baryon is presented based on data recorded by the BABAR detector at the Stanford Linear Accelerator Center. Although the B meson is the lightest bottom-flavored meson, it is heavy enough to decay to a baryon made of three quarks and an antibaryon made of three antiquarks. By studying the baryonic weak decays of the B meson, we can investigate baryon production mechanisms in heavy meson decays. In particular, we measure the rates of the decays B⁻ → Λ{sub c}⁺{bar p}π⁻ and {bar B}° → Λ{sub c}⁺{bar p}. Comparing these rates, we confirm an observed trend in baryonic B decays that the decay with the lower energy release, B⁻ → Λ{sub c}⁺{bar p}π⁻, is favored over {bar B}° → Λ{sub c}⁺{bar p}. The dynamics of the baryon-antibaryon (Λ{sub c}⁺{bar p}) system in the three-body decay also provide insight into baryon-antibaryon production mechanisms. The B⁻ → Λ{sub c}⁺{bar p}π⁻ system is a laboratory for searches for excited Σ{sub c} baryon states; we observe the resonant decays B⁻ → Σ{sub c}(2455)°{bar p} and B⁻ → Σ{sub c}(2800)°{bar p}. This is the first observation of the decay B⁻ → Σ{sub c}(2800)°{bar p}; however, the mass of the observed Σ{sub c}(2800)° state is inconsistent with previous measurements. Finally, we examine the angular distribution of the B⁻ → Σ{sub c}(2455)°{bar p} decays and measure the spin of the Σ{sub c}(2455)° baryon to be J = 1/2, as predicted by the quark model.
Report Numbers
E 1.99:slac-r-923
slac-r-923
Subject(s)
Other Subject(s)
Note
Published through SciTech Connect.
06/02/2009.
"slac-r-923"
Majewski, Stephanie A.
Funding Information
AC02-76SF00515
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