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Title: Measurements of {lambda}{sub c}{sup +} branching fractions of Cabibbo-suppressed decay modes involving {lambda} and {sigma}{sup 0}

Abstract

We measure the branching ratios of the Cabibbo-suppressed decays {lambda}{sub c}{sup +}{yields}{lambda}K{sup +} and {lambda}{sub c}{sup +}{yields}{sigma}{sup 0}K{sup +} relative to the Cabibbo-favored decay modes {lambda}{sub c}{sup +}{yields}{lambda}{pi}{sup +} and {lambda}{sub c}{sup +}{yields}{sigma}{sup 0}{pi}{sup +} to be 0.044{+-}0.004 (stat.){+-}0.003 (syst.) and 0.038{+-}0.005 (stat.){+-}0.003 (syst.), respectively. We set an upper limit on the branching ratio at the 90% confidence level for {lambda}{sub c}{sup +}{yields}{lambda}K{sup +}{pi}{sup +}{pi}{sup -} of 4.1x10{sup -2} relative to {lambda}{sub c}{sup +}{yields}{lambda}{pi}{sup +}, and for {lambda}{sub c}{sup +}{yields}{sigma}{sup 0}K{sup +}{pi}{sup +}{pi}{sup -} of 2.0x10{sup -2} relative to {lambda}{sub c}{sup +}{yields}{sigma}{sup 0}{pi}{sup +}. We also measure the branching fraction for the Cabibbo-favored mode {lambda}{sub c}{sup +}{yields}{sigma}{sup 0}{pi}{sup +} relative to {lambda}{sub c}{sup +}{yields}{lambda}{pi}{sup +} to be 0.977{+-}0.015 (stat.){+-}0.051 (syst.). This analysis was performed using a data sample with an integrated luminosity of 125 fb{sup -1} collected by the BABAR detector at the PEP-II asymmetric-energy B factory at SLAC.

Authors:
; ; ; ; ; ; ; ;  [1];  [2]; ; ;  [3]; ; ; ; ;  [4]; ;  [5]
  1. Laboratoire de Physique des Particules, F-74941 Annecy-le-Vieux (France)
  2. IFAE, Universitat Autonoma de Barcelona, E-08193 Bellaterra, Barcelona (Spain)
  3. Universita di Bari, Dipartimento di Fisica and INFN, I-70126 Bari (Italy)
  4. Institute of High Energy Physics, Beijing 100039 (China)
  5. University of Bergen, Institute of Physics, N-5007 Bergen (Norway) (and others)
Publication Date:
OSTI Identifier:
21020038
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. D, Particles Fields; Journal Volume: 75; Journal Issue: 5; Other Information: DOI: 10.1103/PhysRevD.75.052002; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ASYMMETRY; BRANCHING RATIO; ELECTRON-POSITRON INTERACTIONS; KAONS PLUS; LAMBDA C PLUS BARYONS; MULTIPARTICLE SPECTROMETERS; PARTICLE DECAY; PARTICLE IDENTIFICATION; PEP STORAGE RINGS; PIONS MINUS; PIONS PLUS; SIGMA NEUTRAL PARTICLES

Citation Formats

Aubert, B., Barate, R., Boutigny, D., Couderc, F., Karyotakis, Y., Lees, J. P., Poireau, V., Tisserand, V., Zghiche, A., Grauges, E., Palano, A., Pappagallo, M., Pompili, A., Chen, J. C., Qi, N. D., Rong, G., Wang, P., Zhu, Y. S., Eigen, G., and Ofte, I. Measurements of {lambda}{sub c}{sup +} branching fractions of Cabibbo-suppressed decay modes involving {lambda} and {sigma}{sup 0}. United States: N. p., 2007. Web. doi:10.1103/PHYSREVD.75.052002.
Aubert, B., Barate, R., Boutigny, D., Couderc, F., Karyotakis, Y., Lees, J. P., Poireau, V., Tisserand, V., Zghiche, A., Grauges, E., Palano, A., Pappagallo, M., Pompili, A., Chen, J. C., Qi, N. D., Rong, G., Wang, P., Zhu, Y. S., Eigen, G., & Ofte, I. Measurements of {lambda}{sub c}{sup +} branching fractions of Cabibbo-suppressed decay modes involving {lambda} and {sigma}{sup 0}. United States. doi:10.1103/PHYSREVD.75.052002.
Aubert, B., Barate, R., Boutigny, D., Couderc, F., Karyotakis, Y., Lees, J. P., Poireau, V., Tisserand, V., Zghiche, A., Grauges, E., Palano, A., Pappagallo, M., Pompili, A., Chen, J. C., Qi, N. D., Rong, G., Wang, P., Zhu, Y. S., Eigen, G., and Ofte, I. Thu . "Measurements of {lambda}{sub c}{sup +} branching fractions of Cabibbo-suppressed decay modes involving {lambda} and {sigma}{sup 0}". United States. doi:10.1103/PHYSREVD.75.052002.
@article{osti_21020038,
title = {Measurements of {lambda}{sub c}{sup +} branching fractions of Cabibbo-suppressed decay modes involving {lambda} and {sigma}{sup 0}},
author = {Aubert, B. and Barate, R. and Boutigny, D. and Couderc, F. and Karyotakis, Y. and Lees, J. P. and Poireau, V. and Tisserand, V. and Zghiche, A. and Grauges, E. and Palano, A. and Pappagallo, M. and Pompili, A. and Chen, J. C. and Qi, N. D. and Rong, G. and Wang, P. and Zhu, Y. S. and Eigen, G. and Ofte, I.},
abstractNote = {We measure the branching ratios of the Cabibbo-suppressed decays {lambda}{sub c}{sup +}{yields}{lambda}K{sup +} and {lambda}{sub c}{sup +}{yields}{sigma}{sup 0}K{sup +} relative to the Cabibbo-favored decay modes {lambda}{sub c}{sup +}{yields}{lambda}{pi}{sup +} and {lambda}{sub c}{sup +}{yields}{sigma}{sup 0}{pi}{sup +} to be 0.044{+-}0.004 (stat.){+-}0.003 (syst.) and 0.038{+-}0.005 (stat.){+-}0.003 (syst.), respectively. We set an upper limit on the branching ratio at the 90% confidence level for {lambda}{sub c}{sup +}{yields}{lambda}K{sup +}{pi}{sup +}{pi}{sup -} of 4.1x10{sup -2} relative to {lambda}{sub c}{sup +}{yields}{lambda}{pi}{sup +}, and for {lambda}{sub c}{sup +}{yields}{sigma}{sup 0}K{sup +}{pi}{sup +}{pi}{sup -} of 2.0x10{sup -2} relative to {lambda}{sub c}{sup +}{yields}{sigma}{sup 0}{pi}{sup +}. We also measure the branching fraction for the Cabibbo-favored mode {lambda}{sub c}{sup +}{yields}{sigma}{sup 0}{pi}{sup +} relative to {lambda}{sub c}{sup +}{yields}{lambda}{pi}{sup +} to be 0.977{+-}0.015 (stat.){+-}0.051 (syst.). This analysis was performed using a data sample with an integrated luminosity of 125 fb{sup -1} collected by the BABAR detector at the PEP-II asymmetric-energy B factory at SLAC.},
doi = {10.1103/PHYSREVD.75.052002},
journal = {Physical Review. D, Particles Fields},
number = 5,
volume = 75,
place = {United States},
year = {Thu Mar 01 00:00:00 EST 2007},
month = {Thu Mar 01 00:00:00 EST 2007}
}
  • The authors have measured the branching fractions of the Cabibbo-suppressed decays {Lambda}{sub c}{sup +} --> {Lambda}{sup 0}K{sup +} and {Lambda}{sub c}{sup +} --> {Sigma}{sup 0}K{sup +} relative to the Cabibbo-allowed decay modes {Lambda}{sub c}{sup +} --> {Lambda}{sup 0}{pi}{sup +} and {Lambda}{sub c}{sup +} --> {Sigma}{sup 0}{pi}{sup +} to be 0.044 {+-} 0.004 (stat.) {+-} 0.002 (syst.) and 0.040 {+-} 0.005 (stat.) {+-} 0.004 (syst.), respectively. They also present the first observation of {Lambda}{sub c}{sup +} --> {Lambda}{sup 0}K{sup +}{pi}{sup +}{pi}{sup -} and have measured the branching fraction relative to {Lambda}{sub c}{sup +} --> {Lambda}{sup 0}{pi}{sup +} to be 0.266 {+-}more » 0.027 (stat.) {+-} 0.032 (syst.). The upper limit of the branching fraction into the decay {Lambda}{sub c}{sup +} --> {Sigma}{sup 0}K{sup +}{pi}{sup +}{pi}{sup -} relative to {Lambda}{sub c}{sup +} --> {Sigma}{sup 0}{pi}{sup +} has been measured to be < 3.9 x 10{sup -2} at the 90% confidence level. This analysis was performed using a data sample of 125 fb{sup -1} (integrated luminosity) collected by the BABAR detector at the PEP-II asymmetric-energy B Factory at the Stanford Linear Accelerator Center. All results presented in this contribution are preliminary.« less
  • This dissertation reports on a study of the relative branching fraction measurement of the charmed baryon {Lambda}{sub c} decaying to the Cabibbo-suppressed modes.
  • This article presents the first measurement of the ratio of branching fractions B({lambda}{sub b}{sup 0}{yields}{lambda}{sub c}{sup +}{mu}{sup -}{nu}{sub {mu}})/B({lambda}{sub b}{sup 0}{yields}{lambda}{sub c}{sup +}{pi}{sup -}). Measurements in two control samples using the same technique B(B{sup 0}{yields}D{sup +}{mu}{sup -}{nu}{sub {mu}})/B(B{sup 0}{yields}D{sup +}{pi}{sup -}) and B(B{sup 0}{yields}D*(2010){sup +}{mu}{sup -}{nu}{sub {mu}})/B(B{sup 0}{yields}D*(2010){sup +}{pi}{sup -}) are also reported. The analysis uses data from an integrated luminosity of approximately 172 pb{sup -1} of pp collisions at {radical}(s)=1.96 TeV, collected with the CDF II detector at the Fermilab Tevatron. The relative branching fractions are measured to be (B({lambda}{sub b}{sup 0}{yields}{lambda}{sub c}{sup +}{mu}{sup -}{nu}{sub {mu}})/B({lambda}{sub b}{sup 0}{yields}{lambda}{sub c}{supmore » +}{pi}{sup -}))=16.6{+-}3.0(stat){+-}1.0(syst)(+2.6/-3.4)(PDG){+-}0.3 (EBR), (B(B{sup 0}{yields}D{sup +}{mu}{sup -}{nu}{sub {mu}})/B(B{sup 0}{yields}D{sup +}{pi}{sup -}))9.9{+-}1.0(stat){+-}0.6(syst){+-}0.4(PDG){+-}0.5(EBR), and (B(B{sup 0}{yields}D*(2010){sup +}{mu}{sup -}{nu}{sub {mu}})/B(B{sup 0}{yields}D*(2010){sup +}{pi}{sup -}))=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 {lambda}{sub b}{sup 0} semileptonic decays: {lambda}{sub b}{sup 0}{yields}{lambda}{sub c}(2595){sup +}{mu}{sup -}{nu}{sub {mu}}, {lambda}{sub b}{sup 0}{yields}{lambda}{sub c}(2625){sup +}{mu}{sup -}{nu}{sub {mu}}, {lambda}{sub b}{sup 0}{yields}{sigma}{sub c}(2455){sup 0}{pi}{sup +}{mu}{sup -}{nu}{sub {mu}}, and {lambda}{sub b}{sup 0}{yields}{sigma}{sub c}(2455){sup ++}{pi}{sup -}{mu}{sup -}{nu}{sub {mu}}, relative to the branching fraction of the {lambda}{sub b}{sup 0}{yields}{lambda}{sub c}{sup +}{mu}{sup -}{nu}{sub {mu}} decay. Finally, the transverse-momentum distribution of {lambda}{sub b}{sup 0} baryons produced in pp collisions is measured and found to be significantly different from that of B{sup 0} mesons, which results in a modification in the production cross-section ratio {sigma}{sub {lambda}{sub b}{sup 0}}/{sigma}{sub B{sup 0}} with respect to the CDF I measurement.« less
  • Branching fractions of the decays H{sub b}{yields}H{sub c}{pi}{sup -}{pi}{sup +}{pi}{sup -} relative to H{sub b}{yields}H{sub c}{pi}{sup -} are presented, where H{sub b} (H{sub c}) represents B{sup 0} (D{sup +}), B{sup -} (D{sup 0}), B{sub s}{sup 0} (D{sub s}{sup +}), and {Lambda}{sub b}{sup 0} ({Lambda}{sub c}{sup +}). The measurements are performed with the LHCb detector using 35 pb{sup -1} of data collected at {radical}(s)=7 TeV. The ratios of branching fractions are measured to be [B(B{sup 0}{yields}D{sup +}{pi}{sup -}{pi}{sup +}{pi}{sup -})]/[B(B{sup 0}{yields}D{sup +}{pi}{sup -})]=2.38{+-}0.11{+-}0.21, [B(B{sup -}{yields}D{sup 0}{pi}{sup -}{pi}{sup +}{pi}{sup -})]/[B(B{sup -}{yields}D{sup 0}{pi}{sup -})]= 1.27{+-}0.06{+-}0.11, [B(B{sub s}{sup 0}{yields}D{sub s}{sup +}{pi}{sup -}{pi}{sup +}{pi}{sup -})]/[B(B{submore » s}{sup 0}{yields}D{sub s}{sup +}{pi}{sup -})]=2.01{+-}0.37{+-}0.20, [B({Lambda}{sub b}{sup 0}{yields}{Lambda}{sub c}{sup +}{pi}{sup -} {pi}{sup +}{pi}{sup -})]/[B({Lambda}{sub b}{sup 0}{yields}{Lambda}{sub c}{sup +}{pi}{sup -})]=1.43{+-}0.16{+-}0.13 We also report measurements of partial decay rates of these decays to excited charm hadrons. These results are of comparable or higher precision than existing measurements.« less