BABAR Publications

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PLOT-0052 Observation of the Decay eta_c -> p pbar pi+ pi-

Doc Type

Public Plots or Figures

Record Created

August 3, 2003

Comments

Preliminary result presented at Lepton Photon, 2003

Abstract

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We present a first observation of the etac decay mode etac -> p pbar pi+ pi- and the 
measurement of the branching fraction product BR(B+- -> etac K+-)*BR(etac -> p pbar pi+ pi-) 
from a sample of 89 million BBbar pairs collected by the BaBar detector at the PEP-II 
asymmetric-energy B Factory at SLAC. 
The result is BR(B+- -> etac K+-)*BR(etac -> p pbar pi+ pi-) = (7.6^{+1.7}_{-1.6}\stat +- 0.9\syst)*10^{-6}. 
We also measure the branching ratio for the etac -> p pbar pi+ pi- decay mode with respect to 
the etac -> K Kbar pi decay mode to be BR(etac -> p pbar pi+ pi-) / BR(etac -> K Kbar pi) = (0.092^{+0.024}_
{-0.022}\stat +- 0.014\syst) and, using the world average for BR(etac -> K Kbar pi), we derive 
BR(etac -> p pbar pi+ pi-) = (5.1^{+1.3}_{-1.2}\stat +- 0.8\syst +- 1.6\syst)*10^{-3}.
All the results are preliminary.

Revisions and Files

1 revised August 3, 2003

File Date Thumbnails	File Name	File Type	File Format	File Size (Kb)	Comments
07-AUG-2003	abstract.txt	Abstract	txt	0.82
06-AUG-2003	plot2D1.eps	Figure or plot	eps	20.23	mES distribution of selected events in the DeltaE signal region. The projection of a combined mES-mX UML fit is superimposed: dotted line=combinatorial background; dashed=combinatorial+peaking background; continuous=signal+backgrounds.
06-AUG-2003	plot2D2.eps	Figure or plot	eps	19.57	mX distribution of selected events in the DeltaE signal region. The projection of a combined mES-mX UML fit is superimposed (lines code as above). Peaks corresponding to etac and Jpsi are visible.
06-AUG-2003	plotSB.eps	Figure or plot	eps	20.14	mX distribution of events selected with an additional cut on mES ("signal box") with UML fit result superimposed: dashed line=background; continuous line=etac and Jpsi signal+background.

Submitted To	2003 International Symposium on Lepton and Photon Interactions at High Energies