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Title: A Measurement of the B ---> Eta/C K Branching Fraction Using the BaBar Detector

Abstract

The branching fraction is measured for the decay channels B{sup 0} {yields} {eta}{sub c}K{sub S}{sup 0} and B{sup +} {yields} {eta}{sub c}K{sup +} where {eta}{sub c} {yields} K{bar K}{pi}, using the BABAR detector. The {eta}{sub c} {yields} K{sub S}{sup 0}K{sup +}{pi}{sup -} and {eta}{sub c} {yields} K{sup +}K{sup -}{pi}{sup 0} decay channels are used, including non-resonant decays and possibly those through intermediate resonances.

Authors:
;
Publication Date:
Research Org.:
Stanford Linear Accelerator Center (SLAC)
Sponsoring Org.:
USDOE
OSTI Identifier:
881795
Report Number(s):
SLAC-R-804
TRN: US200612%%872
DOE Contract Number:
AC02-76SF00515
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; PARTICLE DECAY; INTERMEDIATE RESONANCE; BRANCHING RATIO; B NEUTRAL MESONS; B PLUS MESONS; ETA C-2980 MESONS; KAONS NEUTRAL SHORT-LIVED; KAONS PLUS; PIONS MINUS; ANTIKAONS NEUTRAL; KAONS MINUS; PIONS NEUTRAL; Experiment-HEP,HEPEX

Citation Formats

Jackson, Frank, and /Manchester U. A Measurement of the B ---> Eta/C K Branching Fraction Using the BaBar Detector. United States: N. p., 2006. Web. doi:10.2172/881795.
Jackson, Frank, & /Manchester U. A Measurement of the B ---> Eta/C K Branching Fraction Using the BaBar Detector. United States. doi:10.2172/881795.
Jackson, Frank, and /Manchester U. Wed . "A Measurement of the B ---> Eta/C K Branching Fraction Using the BaBar Detector". United States. doi:10.2172/881795. https://www.osti.gov/servlets/purl/881795.
@article{osti_881795,
title = {A Measurement of the B ---> Eta/C K Branching Fraction Using the BaBar Detector},
author = {Jackson, Frank and /Manchester U.},
abstractNote = {The branching fraction is measured for the decay channels B{sup 0} {yields} {eta}{sub c}K{sub S}{sup 0} and B{sup +} {yields} {eta}{sub c}K{sup +} where {eta}{sub c} {yields} K{bar K}{pi}, using the BABAR detector. The {eta}{sub c} {yields} K{sub S}{sup 0}K{sup +}{pi}{sup -} and {eta}{sub c} {yields} K{sup +}K{sup -}{pi}{sup 0} decay channels are used, including non-resonant decays and possibly those through intermediate resonances.},
doi = {10.2172/881795},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Apr 26 00:00:00 EDT 2006},
month = {Wed Apr 26 00:00:00 EDT 2006}
}

Technical Report:

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  • This thesis presents various studies of K{sub s}{sup 0} mesons carried out at the BABAR experiment. Studying multiplicities of K{sub s}{sup 0} in B{bar B} decays provides deeper knowledge of the detector performance and produces an important physical result. The branching fraction of B{bar B} {yields} K{sub s}{sup 0}X decay is measured using 286 pb{sup -1} of data collected during the first year of physics running. The result obtained is BR(B{bar B} {yields} XK{sub s}{sup 0} {yields} {pi}{sup +}{pi}{sup -}) = 0.216 {+-} 0.003(stat.) {+-} 0.015(syst.). Implications of this result to the presence of the new physics at TeV scalemore » are discussed. The momentum spectrum of K{sub s}{sup 0} coming from B{bar B} {yields} XK{sub s}{sup 0} {yields} {pi}{sup +}{pi}{sup -} is also presented.« less
  • The BABAR experiment at SLAC provides an opportunity for measurement of the Standard Model parameters describing CP violation. A method of measuring the CKM matrix element |V{sub cb}| using Inclusive Semileptonic B decays in events tagged by a fully reconstructed decay of one of the B mesons is presented here. This mode is considered to be one of the most powerful approaches due to its large branching fraction, simplicity of the theoretical description and very clean experimental signatures. Using fully reconstructed B mesons to flag B{bar B} event we were able to produce the spectrum and branching fraction for electronmore » momenta P{sub C.M.S.} > 0.5 GeV/c. Extrapolation to the lower momenta has been carried out with Heavy Quark Effective Theory. The branching fractions are measured separately for charged and neutral B mesons. For 82 fb{sup -1} of data collected at BABAR we obtain: BR(B{sup {+-}} {yields} X e{bar {nu}}) = 10.63 {+-} 0.24 {+-} 0.29%, BR(B{sup 0} {yields} X e{bar {nu}}) = 10.68 {+-} 0.34 {+-} 0.31%, averaged BR(B {yields} X e{bar {nu}}) = 10.65 {+-} 0.19 {+-} 0.27%, ratio of Branching fractions BR(B{sup {+-}})/BR(B{sup 0}) = 0.996 {+-} 0.039 {+-} 0.015 (errors are statistical and systematic, respectively). They also obtain V{sub cb} = 0.0409 {+-} 0.00074 {+-} 0.0010 {+-} 0.000858 (errors are: statistical, systematic and theoretical).« less
  • A measurement of {Beta}({Lambda}{sub c}{sup +} {yields} pK{sup -} {pi}{sup +}) is presented based on data collected with the BaBar detector at the Stanford Linear Accelerator Center. Branching fraction measurements represent a large portion of what is known about short-lived particles, the strong force that binds them, and the weak force that causes them to decay. While the majority of branching fraction measurements are done as ratios between two decay modes, it is the absolute measurements of a few particular decay modes that set the scale for these relative measurements. The {Lambda}{sub c}{sup +} particle is one of the fourmore » weakly decaying hadrons into which more than 90% of the known heavy quark hadrons will eventually decay. Thus, an absolute measurement of the branching fraction for {Lambda}{sub c}{sup +} {yields} pK{sup -}{pi}{sup +} is important for many studies of the heavy quark sector, from spectroscopy to B meson decays. The number of produced {Lambda}{sub c}{sup +}'s is inferred from the number of events reconstructed with an antiproton and an accompanying D meson. The final result of {Beta}({Lambda}{sub c}{sup +} {yields} pK{sup -} {pi}{sup +}) = [6.12 {+-} 0.31(stat.) {+-} 0.42(syst.)]% represents more than a two-fold improvement in precision over the world average. The dominant source of systematic uncertainty is the irreducible background of {Xi}{sub c} baryons.« less
  • The authors report preliminary results on the measurement of branching fractions of exclusive decays of neutral and charged B mesons into two-body final states containing a charmonium state and a light strange meson. The charmonium mesons considered are J/{psi}, {psi}(2S) and {chi}{sub c1}, and the light mesons are either K or K*. They use a sample of about 124 million B{bar B} events collected with the BABAR detector at the PEP-II storage ring at the Stanford Linear Accelerator Center.
  • We study the decays B{sup +} {yields} {eta}{sub c}K{sup +} and B{sup 0} {yields} {eta}{sub c}K{sup 0}, where the {eta}{sub c} is reconstructed in the K{sub S}{sup 0} K{sup {+-}} {pi}{sup {-+}} and K{sup +}K{sup -} {pi}{sup 0} decay modes. Results are based on a sample of 86 million B{bar B} pairs collected with the BABAR detector at the SLAC e{sup +}e{sup -} B Factory. We measure the branching fractions {Beta}(B{sup +} {yields} {eta}{sub c}K{sup +}) = (1.34 {+-} 0.09 {+-} 0.13 {+-} 0.41) x 10{sup -3} and {Beta}(B{sup 0} {yields} {eta}{sub c}K{sup 0}) = (1.18 {+-} 0.16 {+-} 0.13more » {+-} 0.37) x 10{sup -3}, where the first error is statistical, the second is systematic, and the third reflects the {eta}{sub c} branching fraction uncertainty. In addition, we search for B {yields} {eta}{sub c}K events with {eta}{sub c} {yields} 2(K{sup +}K{sup -}) and {eta}{sub c} {yields} {phi}{phi} and determine the {eta}{sub c} decay branching fraction ratios {Beta}({eta}{sub c} {yields} 2(K{sup +}K{sup -}))/{Beta}({eta}{sub c} {yields} K{bar K}{pi}) = (2.3 {+-} 0.7 {+-} 0.6) x 10{sup -2} and {Beta}({eta}{sub c} {yields} {phi}{phi})/{Beta}({eta}{sub c} {yields} K{bar K}{pi}) = (5.5 {+-} 1.4 {+-} 0.5) x 10{sup -2}.« less