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2007-01-09

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Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/131430

Inclusive Λ+c production in e+e− annihilations at √s=10.54  GeV and in Υ(4S) decays

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https://doi.org/10.1103/PhysRevD.75.012003

Resum

We present measurements of the total production rates and momentum distributions of the charmed baryon Λ + c in e + e − → hadrons at a center-of-mass energy of 10.54 GeV and in Υ ( 4 S ) decays. In hadronic events at 10.54 GeV, charmed hadrons are almost exclusively leading particles in e + e − → c ¯ c events, allowing direct studies of c -quark fragmentation. We measure a momentum distribution for Λ + c baryons that differs significantly from those measured previously for charmed mesons. Comparing with a number of models, we find none that can describe the distribution completely. We measure an average scaled momentum of ⟨ x p ⟩ = 0.574 ± 0.009 and a total rate of N q ¯ q Λ c = 0.057 ± 0.002 ( exp  . ) ± 0.015 ( BF )     Λ + c per hadronic event, where the experimental error is much smaller than that due to the branching fraction into the reconstructed decay mode, p K − π + . In Υ ( 4 S ) decays we measure a total rate of N Υ Λ c = 0.091 ± 0.006 ( exp  . ) ± 0.024 ( BF ) per Υ ( 4 S ) decay, and find a much softer momentum distribution than expected from B decays into a Λ + c plus an antinucleon and one to three pions.

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Física de partícules, Experiments

Matèries (anglès)

Particle physics, Experiments

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Articles publicats en revistes (Física Quàntica i Astrofísica)

Citació

GRAUGÉS POUS, Eugeni and BABAR Collaboration. Inclusive Λ+c production in e+e− annihilations at √s=10.54  GeV and in Υ(4S) decays. Physical Review D. 2007. Vol. 75, num. 1, pags. 012003. ISSN 1550-7998. [consulted: 9 of August of 2026]. Available at: https://hdl.handle.net/2445/131430

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