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Title: Observation of the Decay B{sup 0}{yields}J/{psi}{eta}

Abstract

We report the first observation of B{sup 0}{yields}J/{psi}{eta} decay. These results are obtained from a data sample that contains 449x10{sup 6} BB pairs accumulated at the {upsilon}(4S) resonance with the Belle detector at the KEKB asymmetric-energy e{sup +}e{sup -} collider. We observe a signal with a significance of 8.1{sigma} and obtain a branching fraction of (9.5{+-}1.7(stat){+-}0.8(syst))x10{sup -6}.

Authors:
 [1]; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ;  [2]
  1. Department of Physics, Fu Jen Catholic University, Taipei, Taiwan (China)
  2. High Energy Accelerator Research Organization (KEK), Tsukuba (Japan) (and others)
Publication Date:
OSTI Identifier:
20951180
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review Letters; Journal Volume: 98; Journal Issue: 13; Other Information: DOI: 10.1103/PhysRevLett.98.131803; (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; B NEUTRAL MESONS; BRANCHING RATIO; ETA MESONS; J PSI-3097 MESONS; PARTICLE DECAY

Citation Formats

Chang, M.-C., Abe, K., Adachi, I., Gershon, T., Haba, J., Hazumi, M., Itoh, R., Iwasaki, Y., Kichimi, H., Krokovny, P., Limosani, A., Nakamura, I., Nakao, M., Nishida, S., Ozaki, H., Sakai, Y., Sumisawa, K., Tajima, O., Takasaki, F., and Tamai, K.. Observation of the Decay B{sup 0}{yields}J/{psi}{eta}. United States: N. p., 2007. Web. doi:10.1103/PHYSREVLETT.98.131803.
Chang, M.-C., Abe, K., Adachi, I., Gershon, T., Haba, J., Hazumi, M., Itoh, R., Iwasaki, Y., Kichimi, H., Krokovny, P., Limosani, A., Nakamura, I., Nakao, M., Nishida, S., Ozaki, H., Sakai, Y., Sumisawa, K., Tajima, O., Takasaki, F., & Tamai, K.. Observation of the Decay B{sup 0}{yields}J/{psi}{eta}. United States. doi:10.1103/PHYSREVLETT.98.131803.
Chang, M.-C., Abe, K., Adachi, I., Gershon, T., Haba, J., Hazumi, M., Itoh, R., Iwasaki, Y., Kichimi, H., Krokovny, P., Limosani, A., Nakamura, I., Nakao, M., Nishida, S., Ozaki, H., Sakai, Y., Sumisawa, K., Tajima, O., Takasaki, F., and Tamai, K.. Fri . "Observation of the Decay B{sup 0}{yields}J/{psi}{eta}". United States. doi:10.1103/PHYSREVLETT.98.131803.
@article{osti_20951180,
title = {Observation of the Decay B{sup 0}{yields}J/{psi}{eta}},
author = {Chang, M.-C. and Abe, K. and Adachi, I. and Gershon, T. and Haba, J. and Hazumi, M. and Itoh, R. and Iwasaki, Y. and Kichimi, H. and Krokovny, P. and Limosani, A. and Nakamura, I. and Nakao, M. and Nishida, S. and Ozaki, H. and Sakai, Y. and Sumisawa, K. and Tajima, O. and Takasaki, F. and Tamai, K.},
abstractNote = {We report the first observation of B{sup 0}{yields}J/{psi}{eta} decay. These results are obtained from a data sample that contains 449x10{sup 6} BB pairs accumulated at the {upsilon}(4S) resonance with the Belle detector at the KEKB asymmetric-energy e{sup +}e{sup -} collider. We observe a signal with a significance of 8.1{sigma} and obtain a branching fraction of (9.5{+-}1.7(stat){+-}0.8(syst))x10{sup -6}.},
doi = {10.1103/PHYSREVLETT.98.131803},
journal = {Physical Review Letters},
number = 13,
volume = 98,
place = {United States},
year = {Fri Mar 30 00:00:00 EDT 2007},
month = {Fri Mar 30 00:00:00 EDT 2007}
}
  • We present improved measurements of CP-violation parameters in B{sup 0}{yields}{phi}K{sup 0}, {eta}{sup '}K{sup 0}, K{sub S}{sup 0}K{sub S}{sup 0}K{sub S}{sup 0} decays based on a sample of 535x10{sup 6} BB pairs collected at the {upsilon}(4S) resonance with the Belle detector at the KEKB energy-asymmetric e{sup +}e{sup -} collider. We obtain sin2{phi}{sub 1}{sup eff}=+0.64{+-}0.10(stat){+-}0.04(syst) for B{sup 0}{yields}{eta}{sup '}K{sup 0}, +0.50{+-}0.21(stat){+-}0.06(syst) for B{sup 0}{yields}{phi}K{sup 0}, and +0.30{+-}0.32(stat){+-}0.08(syst) for B{sup 0}{yields}K{sub S}{sup 0}K{sub S}{sup 0}K{sub S}{sup 0} decays. We have observed CP violation in the B{sup 0}{yields}{eta}{sup '}K{sup 0} decay with a significance of 5.6 standard deviations. We also perform an improved measurementmore » of CP asymmetries in B{sup 0}{yields}J/{psi}K{sup 0} decays and obtain sin2{phi}{sub 1}=+0.642{+-}0.031(stat){+-}0.017(syst)« less
  • We report the observation of B{sup -}{yields}J/{psi}{lambda}p and searches for B{sup -}{yields}J/{psi}{sigma}{sup 0}p and B{sup 0}{yields}J/{psi}pp decays, using a sample of 275x10{sup 6} BB pairs collected with the Belle detector at the {upsilon}(4S) resonance. We observe a signal of 17.2{+-}4.1 events with a significance of 11.1{sigma} and obtain a branching fraction of B(B{sup -}{yields}J/{psi}{lambda}p)=11.6{+-}2.8(stat){sub -2.3}{sup +1.8}(sys)x10{sup -6}. No signal is found for either of the two decay modes, B{sup -}{yields}J/{psi}{sigma}{sup 0}p and B{sup 0}{yields}J/{psi}pp, and upper limits for the branching fractions are determined to be B(B{sup -}{yields}J/{psi}{sigma}{sup 0}p)<1.1x10{sup -5} and B(B{sup 0}{yields}J/{psi}pp)<8.3x10{sup -7} at 90% confidence level.
  • We report the results of searches for B{sup +}{yields}J/{psi}{eta}{sup '}K{sup +} and B{sup 0}{yields}J/{psi}{eta}{sup '}K{sub S}{sup 0} decays, using a sample of 388x10{sup 6} BB pairs collected with the Belle detector at the {upsilon}(4S) resonance. No statistically significant signal is found for either of the two decay modes and upper limits for the branching fractions are determined to be B(B{sup +}{yields}J/{psi}{eta}{sup '}K{sup +})<8.8x10{sup -5} and B(B{sup 0}{yields}J/{psi}{eta}{sup '}K{sub S}{sup 0})<2.5x10{sup -5} at 90% confidence level.
  • We report the first observation of B{sub s}{sup 0}{yields}{psi}(2S){phi} decay in pp collisions at {radical}(s)=1.96 TeV using 360 pb{sup -1} of data collected by the CDF II detector at the Fermilab Tevatron. We observe 20.2{+-}5.0 and 12.3{+-}4.1 B{sub s}{sup 0}{yields}{psi}(2S){phi} candidates, in {psi}(2S){yields}{mu}{sup +}{mu}{sup -} and {psi}(2S){yields}J/{psi}{pi}{sup +}{pi}{sup -} decay modes, respectively. We present a measurement of the relative branching fraction B(B{sub s}{sup 0}{yields}{psi}(2S){phi})/B(B{sub s}{sup 0}{yields}J/{psi}{phi})=0.52{+-}0.13(stat){+-}0.04= (syst){+-}0.06(BR) using the {psi}(2S){yields}{mu}{sup +}{mu}{sup -} decay mode.
  • We report the first search for CP-violating decays of the {upsilon}(4S) using a data sample that contains 535x10{sup 6} {upsilon}(4S) mesons with the Belle detector at the KEKB asymmetric-energy e{sup +}e{sup -} collider. A partial reconstruction technique is employed to enhance the signal sensitivity. No significant signals were observed. We obtain an upper limit of 4x10{sup -7} at the 90% confidence level for the branching fractions of the CP violating modes, {upsilon}(4S){yields}B{sup 0}B{sup 0}{yields}J/{psi}K{sub S}{sup 0}+J/{psi}({eta}{sub c})K{sub S}{sup 0}. Extrapolating the result, we find that an observation with 5{sigma} significance is expected with a 30 ab{sup -1} data sample, whichmore » is within the reach of a future super B factory.« less