Study of B-Meson Decays to Final States with a Single Charm Baryon
- Stanford Univ., CA (United States)
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+c$$\bar{p}$$π- and $$\bar{B}$$0 → Λ+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+c$$\bar{p}$$π-, is favored over $$\bar{B}$$0 → Λ+c$$\bar{p}$$. The dynamics of the baryon-antibaryon (Λ+c$$\bar{p}$$) system in the three-body decay also provide insight into baryon-antibaryon production mechanisms. The B- → Λ+c$$\bar{p}$$π- system is a laboratory for searches for excited #c baryon states; we observe the resonant decays B- → Σc(2455) 0$$\bar{p}$$ and B- → Σc(2800) 0$$\bar{p}$$. This is the first observation of the decay B- → Σc(2800) 0$$\bar{p}$$; however, the mass of the observed #c(2800)0 state is inconsistent with previous measurements. Finally, we examine the angular distribution of the B- → Σc(2455) 0$$\bar{p}$$ decays and measure the spin of the B- → Σc(2455) 0$$\bar{p}$$ baryon to be J = 1/2, as predicted by the quark model.
- Research Organization:
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC02-76SF00515
- OSTI ID:
- 953857
- Report Number(s):
- SLAC-R-923; TRN: US1000661
- Country of Publication:
- United States
- Language:
- English
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