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First measurement of the ratio of branching fractions B(Λb 0→Λc+μ-ν̄μ)/B(Λb 0→Λc+π-)

Publication ,  Journal Article
Aaltonen, T; Adelman, J; Akimoto, T; Albrow, MG; González, BÁ; Amerio, S; Amidei, D; Anastassov, A; Annovi, A; Antos, J; Apollinari, G; Cho, K ...
Published in: Physical Review D - Particles, Fields, Gravitation and Cosmology
2009

This article presents the first measurement of the ratio of branching fractions B(Λb0→Λc+μ-ν̄μ)/ B(Λb0→Λc+π-). Measurements in two control samples using the same technique B(B̄0→D+μ- ν̄μ)/B(B̄0→D+π-) and B(B̄ 0→D*(2010)+μ-ν̄μ)/ B(B̄0→D*(2010)+π-) are also reported. The analysis uses data from an integrated luminosity of approximately 172pb-1 of pp̄ collisions at s=1.96TeV, collected with the CDF II detector at the Fermilab Tevatron. The relative branching fractions are measured to be B(Λb 0→Λc+μ-ν̄μ)B(Λb 0→Λc+π-)=16.6±3.0(stat) ±1.0(syst)+2.6-3.4(PDG) ±0.3(EBR), B(B̄0→D+μ-ν̄μ) B(B̄0→D+π-)=9.9±1.0(stat) ±0.6(syst)±0.4(PDG)± 0.5(EBR), and B(B̄0→D*( 2010)+μ-ν̄μ)B(B̄0→D*( 2010)+π-)=16.5±2.3(stat) ±0.6(syst)±0.5(PDG)± 0.8(EBR). The uncertainties are from statistics (stat), internal systematics (syst), world averages of measurements published by the Particle Data Group or subsidiary measurements in this analysis (PDG), and unmeasured branching fractions estimated from theory (EBR), respectively. This article also presents measurements of the branching fractions of four new Λb 0 semileptonic decays: Λb0→Λc( 2595)+μ-ν̄μ, Λb0→Λc( 2625)+μ-ν̄μ, Λb0→Σc( 2455)0π+μ-ν̄μ, and Λb 0→Σc(2455)++π-μ-ν̄μ, relative to the branching fraction of the Λb0→Λc+μ- ν̄μ decay. Finally, the transverse-momentum distribution of Λb0 baryons produced in pp̄ collisions is measured and found to be significantly different from that of B̄0 mesons, which results in a modification in the production cross-section ratio σΛb0/σB̄0 with respect to the CDF I measurement. © 2009 The American Physical Society.

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Published In

Physical Review D - Particles, Fields, Gravitation and Cosmology

DOI

ISSN

1550-7998

Publication Date

2009

Volume

79

Issue

3

Related Subject Headings

  • Nuclear & Particles Physics
  • 5107 Particle and high energy physics
  • 5101 Astronomical sciences
  • 4902 Mathematical physics
  • 0206 Quantum Physics
  • 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics
  • 0201 Astronomical and Space Sciences
 

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Aaltonen, T., Adelman, J., Akimoto, T., Albrow, M. G., González, B. Á., Amerio, S., … Strologas, J. (2009). First measurement of the ratio of branching fractions B(Λb 0→Λc+μ-ν̄μ)/B(Λb 0→Λc+π-). Physical Review D - Particles, Fields, Gravitation and Cosmology, 79(3). https://doi.org/10.1103/PhysRevD.79.032001
Aaltonen, T., J. Adelman, T. Akimoto, M. G. Albrow, B. Á. González, S. Amerio, D. Amidei, et al. “First measurement of the ratio of branching fractions B(Λb 0→Λc+μ-ν̄μ)/B(Λb 0→Λc+π-).” Physical Review D - Particles, Fields, Gravitation and Cosmology 79, no. 3 (2009). https://doi.org/10.1103/PhysRevD.79.032001.
Aaltonen T, Adelman J, Akimoto T, Albrow MG, González BÁ, Amerio S, et al. First measurement of the ratio of branching fractions B(Λb 0→Λc+μ-ν̄μ)/B(Λb 0→Λc+π-). Physical Review D - Particles, Fields, Gravitation and Cosmology. 2009;79(3).
Aaltonen, T., et al. “First measurement of the ratio of branching fractions B(Λb 0→Λc+μ-ν̄μ)/B(Λb 0→Λc+π-).” Physical Review D - Particles, Fields, Gravitation and Cosmology, vol. 79, no. 3, 2009. Scival, doi:10.1103/PhysRevD.79.032001.
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First measurement of the ratio of branching fractions B(Λb 0→Λc+μ-ν̄μ)/B(Λb 0→Λc+π-). Physical Review D - Particles, Fields, Gravitation and Cosmology. 2009;79(3).

Published In

Physical Review D - Particles, Fields, Gravitation and Cosmology

DOI

ISSN

1550-7998

Publication Date

2009

Volume

79

Issue

3

Related Subject Headings

  • Nuclear & Particles Physics
  • 5107 Particle and high energy physics
  • 5101 Astronomical sciences
  • 4902 Mathematical physics
  • 0206 Quantum Physics
  • 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics
  • 0201 Astronomical and Space Sciences