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Title: Measurements of Branching Fraction, Polarization, and Charge Asymmetry of B{sup {+-}}{yields}{rho}{sup {+-}}{rho}{sup 0} and a Search for B{sup {+-}}{yields}{rho}{sup {+-}}f{sub 0}(980)

Abstract

We measure the branching fraction (B), polarization (f{sub L}), and CP asymmetry (A{sub CP}) of B{sup {+-}}{yields}{rho}{sup {+-}}{rho}{sup 0} decays and search for the decay B{sup {+-}}{yields}{rho}{sup {+-}}f{sub 0}(980) based on a data sample of 231.8x10{sup 6} {upsilon}(4S){yields}BB decays collected with the BABAR detector at the SLAC PEP-II asymmetric-energy B factory. In B{sup {+-}}{yields}{rho}{sup {+-}}{rho}{sup 0} decays we measure B=(16.8{+-}2.2{+-}2.3)x10{sup -6}, f{sub L}=0.905{+-}0.042{sub -0.027}{sup +0.023}, and A{sub CP}=-0.12{+-}0.13{+-}0.10, and find an upper limit on the branching fraction of B{sup {+-}}{yields}{rho}{sup {+-}}f{sub 0}(980)({yields}{pi}{sup +}{pi}{sup -}) decays of 1.9x10{sup -6} at 90% confidence level.

Authors:
; ; ; ; ; ; ; ;  [1];  [2];  [3]; ; ; ; ;  [4]; ; ;  [5];  [6]
  1. Laboratoire de Physique des Particules, IN2P3/CNRS et Universite de Savoie, F-74941 Annecy-Le-Vieux (France)
  2. Universitat de Barcelona, Facultat de Fisica, Departament ECM, E-08028 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)
  6. Lawrence Berkeley National Laboratory and University of California, Berkeley, California 94720 (United States) (and others)
Publication Date:
OSTI Identifier:
20861537
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review Letters; Journal Volume: 97; Journal Issue: 26; Other Information: DOI: 10.1103/PhysRevLett.97.261801; (c) 2006 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 MINUS MESONS; B PLUS MESONS; BRANCHING RATIO; CP INVARIANCE; F0-980 MESONS; PAIR PRODUCTION; PARTICLE DECAY; PIONS MINUS; PIONS PLUS; POLARIZATION; RHO-770 MESONS; STANFORD LINEAR ACCELERATOR CENTER

Citation Formats

Aubert, B., Bona, M., Boutigny, D., Couderc, F., Karyotakis, Y., Lees, J. P., Poireau, V., Tisserand, V., Zghiche, A., Grauges, E., Palano, A., Chen, J. C., Qi, N. D., Rong, G., Wang, P., Zhu, Y. S., Eigen, G., Ofte, I., Stugu, B., and Abrams, G. S. Measurements of Branching Fraction, Polarization, and Charge Asymmetry of B{sup {+-}}{yields}{rho}{sup {+-}}{rho}{sup 0} and a Search for B{sup {+-}}{yields}{rho}{sup {+-}}f{sub 0}(980). United States: N. p., 2006. Web. doi:10.1103/PHYSREVLETT.97.261801.
Aubert, B., Bona, M., Boutigny, D., Couderc, F., Karyotakis, Y., Lees, J. P., Poireau, V., Tisserand, V., Zghiche, A., Grauges, E., Palano, A., Chen, J. C., Qi, N. D., Rong, G., Wang, P., Zhu, Y. S., Eigen, G., Ofte, I., Stugu, B., & Abrams, G. S. Measurements of Branching Fraction, Polarization, and Charge Asymmetry of B{sup {+-}}{yields}{rho}{sup {+-}}{rho}{sup 0} and a Search for B{sup {+-}}{yields}{rho}{sup {+-}}f{sub 0}(980). United States. doi:10.1103/PHYSREVLETT.97.261801.
Aubert, B., Bona, M., Boutigny, D., Couderc, F., Karyotakis, Y., Lees, J. P., Poireau, V., Tisserand, V., Zghiche, A., Grauges, E., Palano, A., Chen, J. C., Qi, N. D., Rong, G., Wang, P., Zhu, Y. S., Eigen, G., Ofte, I., Stugu, B., and Abrams, G. S. Sun . "Measurements of Branching Fraction, Polarization, and Charge Asymmetry of B{sup {+-}}{yields}{rho}{sup {+-}}{rho}{sup 0} and a Search for B{sup {+-}}{yields}{rho}{sup {+-}}f{sub 0}(980)". United States. doi:10.1103/PHYSREVLETT.97.261801.
@article{osti_20861537,
title = {Measurements of Branching Fraction, Polarization, and Charge Asymmetry of B{sup {+-}}{yields}{rho}{sup {+-}}{rho}{sup 0} and a Search for B{sup {+-}}{yields}{rho}{sup {+-}}f{sub 0}(980)},
author = {Aubert, B. and Bona, M. 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 Chen, J. C. and Qi, N. D. and Rong, G. and Wang, P. and Zhu, Y. S. and Eigen, G. and Ofte, I. and Stugu, B. and Abrams, G. S.},
abstractNote = {We measure the branching fraction (B), polarization (f{sub L}), and CP asymmetry (A{sub CP}) of B{sup {+-}}{yields}{rho}{sup {+-}}{rho}{sup 0} decays and search for the decay B{sup {+-}}{yields}{rho}{sup {+-}}f{sub 0}(980) based on a data sample of 231.8x10{sup 6} {upsilon}(4S){yields}BB decays collected with the BABAR detector at the SLAC PEP-II asymmetric-energy B factory. In B{sup {+-}}{yields}{rho}{sup {+-}}{rho}{sup 0} decays we measure B=(16.8{+-}2.2{+-}2.3)x10{sup -6}, f{sub L}=0.905{+-}0.042{sub -0.027}{sup +0.023}, and A{sub CP}=-0.12{+-}0.13{+-}0.10, and find an upper limit on the branching fraction of B{sup {+-}}{yields}{rho}{sup {+-}}f{sub 0}(980)({yields}{pi}{sup +}{pi}{sup -}) decays of 1.9x10{sup -6} at 90% confidence level.},
doi = {10.1103/PHYSREVLETT.97.261801},
journal = {Physical Review Letters},
number = 26,
volume = 97,
place = {United States},
year = {Sun Dec 31 00:00:00 EST 2006},
month = {Sun Dec 31 00:00:00 EST 2006}
}
  • We present measurements of the branching fractions, longitudinal polarization, and direct CP-violation asymmetries for the decays B{sup +}{yields}{rho}{sup 0}K*{sup +} and B{sup +}{yields}f{sub 0}(980)K*{sup +} with a sample of (467{+-}5)x10{sup 6}BB pairs collected with the BABAR detector at the PEP-II asymmetric-energy e{sup +}e{sup -} collider at the SLAC National Accelerator Laboratory. We observe B{sup +}{yields}{rho}{sup 0}K{sup *+} with a significance of 5.3{sigma} and measure the branching fraction B(B{sup +}{yields}{rho}{sup 0}K{sup *+})=(4.6{+-}1.0{+-}0.4)x10{sup -6}, the longitudinal polarization f{sub L}=0.78{+-}0.12{+-}0.03, and the CP-violation asymmetry A{sub CP}=0.31{+-}0.13{+-}0.03. We observe B{sup +}{yields}f{sub 0}(980)K*{sup +} and measure the branching fraction B(B{sup +}{yields}f{sub 0}(980)K*{sup +})xB(f{sub 0}(980){yields}{pi}{sup +}{pi}{supmore » -})=(4.2{+-}0.6{+-}0.3)x10{sup -6} and the CP-violation asymmetry A{sub CP}=-0.15{+-}0.12{+-}0.03. The first uncertainty quoted is statistical and the second is systematic.« less
  • We have measured the branching fraction B, longitudinal polarization fraction f{sub L}, and CP asymmetry coefficients A and S for B{sup 0}{yields}{rho}{sup +}{rho}{sup -} decays with the Belle detector at the KEKB e{sup +}e{sup -} collider using 253 fb{sup -1} of data. We obtain B=[22.8{+-}3.8(stat){sub -2.6}{sup +2.3}(syst)]x10{sup -6}, f{sub L}=0.941{sub -0.040}{sup +0.034}(stat){+-}0.030(syst), A=0.00{+-}0.30(stat){+-}0.09(syst), and S=0.08{+-}0.41(stat){+-}0.09(syst). These values are used to constrain the Cabibbo-Kobayashi-Maskawa phase {phi}{sub 2}; the solution consistent with the standard model is {phi}{sub 2}=(88{+-}17) deg. or 59 deg. <{phi}{sub 2}<115 deg. at 90% C.L.
  • In the two-quark model supposition for f{sub 0}(980) and K{sub 0}{sup *}(1430), the branching ratios and the direct CP-violating asymmetries for decays B{sup 0}{yields}f{sub 0}(980){rho}{sup 0}({omega}, {phi}), K{sub 0}{sup *0}(1430){rho}{sup 0}({omega}), K{sub 0}{sup *-}(1430){rho}{sup +} and B{sup -}{yields}f{sub 0}(980){rho}{sup -}, K{sub 0}{sup *0}(1430){rho}{sup -}, K{sub 0}{sup *-}(1430){rho}{sup 0}({omega}) are studied by employing the perturbative QCD factorization approach. we find the following results: (a) if the scalar meson f{sub 0}(980) is viewed as a mixture of ss and (uu+dd)/{radical}(2), the branching ratios of the b{yields}d transition processes B{sup 0}{yields}f{sub 0}(980){rho}{sup 0}({omega},{phi}) and B{sup -}{yields}f{sub 0}(980){rho}{sup -} are smaller than the currentlymore » experimental upper limits, and the predictions for the decays B{sup 0}{yields}f{sub 0}(980){omega}, B{sup -}{yields}f{sub 0}(980){rho}{sup -} are not far away from their limits; (b) in the b{yields}s transition processes B{yields}K{sub 0}{sup *}(1430){rho}({omega}), the branching ratio of B{sup 0}{yields}K{sub 0}{sup *0}(1430){rho}{sup 0} is the smallest one, at the order of 10{sup -7} by treating K{sub 0}{sup *}(1430) as the lowest lying state, about 4.8x10{sup -6} by considering K{sub 0}{sup *}(1430) as the first excited state; (c) the direct CP-violating asymmetries of decays B{yields}f{sub 0}(980){rho}({omega}) have a strong dependence on the mixing angle {theta}: they are large in the range of 25 degree sign <{theta}<40 degree sign , and small in the range of 140 degree sign <{theta}<165 degree sign , while the direct CP-violating asymmetry amplitudes of decays B{yields}K{sub 0}{sup *}(1430){rho}({omega}) are not large in the two kinds of state supposition for K{sub 0}{sup *}(1430) and most of them are less than 20%.« less
  • We report an improved measurement of the B{sup +}{yields}D{sup +}D{sup 0} and B{sup 0}{yields}D{sup 0}D{sup 0} decays based on 657x10{sup 6} BB events collected with the Belle detector at KEKB. We measure the branching fraction and charge asymmetry for the B{sup +}{yields}D{sup +}D{sup 0} decay: B(B{sup +}{yields}D{sup +}D{sup 0})=(3.85{+-}0.31{+-}0.38)x10{sup -4} and A{sub CP}(B{sup +}{yields}D{sup +}D{sup 0})=0.00{+-}0.08{+-}0.02, where the first error is statistical and the second is systematic. We also set the upper limit for the B{sup 0}{yields}D{sup 0}D{sup 0} decay: B(B{sup 0}{yields}D{sup 0}D{sup 0})<0.43x10{sup -4} at 90% CL.