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Title: Evidence for the Rare Decay B{sup +}{yields}D{sub s}{sup +}{pi}{sup 0}

Abstract

We have searched for the rare decay B{sup +}{yields}D{sub s}{sup +}{pi}{sup 0}. The analysis is based on a sample of 232x10{sup 6} {upsilon}(4S){yields}BB decays collected with the BABAR detector at the SLAC PEP-II e{sup +}e{sup -} storage ring. We find 19.6 signal events, corresponding to a significance of 4.7{sigma}. The extracted signal yield including statistical and systematic uncertainties is 20.1{sub -6.0-1.5}{sup +6.8+0.4}, and we measure B(B{sup +}{yields}D{sub s}{sup +}{pi}{sup 0})=(1.5{sub -0.4}{sup +0.5}{+-}0.1{+-}0.2)x10{sup -5}, where the first uncertainty is statistical, the second is systematic, and the last is due to the uncertainty on the D{sub s}{sup +} decay and its daughter decay branching fractions.

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. Facultat de Fisica, Departament ECM, Universitat de Barcelona, E-08028 Barcelona (Spain)
  3. Dipartimento di Fisica and INFN, Universita di Bari, I-70126 Bari (Italy)
  4. Institute of High Energy Physics, Beijing 100039 (China)
  5. Institute of Physics, University of Bergen, N-5007 Bergen (Norway)
  6. Lawrence Berkeley National Laboratory and University of California, Berkeley, California 94720 (United States) (and others)
Publication Date:
OSTI Identifier:
20951267
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review Letters; Journal Volume: 98; Journal Issue: 17; Other Information: DOI: 10.1103/PhysRevLett.98.171801; (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; B PLUS MESONS; BRANCHING RATIO; D PLUS MESONS; PARTICLE DECAY; PARTICLE PRODUCTION; PIONS NEUTRAL; SIGNALS; STANFORD LINEAR ACCELERATOR CENTER; STORAGE RINGS

Citation Formats

Aubert, B., Bona, M., Boutigny, D., Karyotakis, Y., Lees, J. P., Poireau, V., Prudent, X., 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. Evidence for the Rare Decay B{sup +}{yields}D{sub s}{sup +}{pi}{sup 0}. United States: N. p., 2007. Web. doi:10.1103/PHYSREVLETT.98.171801.
Aubert, B., Bona, M., Boutigny, D., Karyotakis, Y., Lees, J. P., Poireau, V., Prudent, X., 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. Evidence for the Rare Decay B{sup +}{yields}D{sub s}{sup +}{pi}{sup 0}. United States. doi:10.1103/PHYSREVLETT.98.171801.
Aubert, B., Bona, M., Boutigny, D., Karyotakis, Y., Lees, J. P., Poireau, V., Prudent, X., 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. Fri . "Evidence for the Rare Decay B{sup +}{yields}D{sub s}{sup +}{pi}{sup 0}". United States. doi:10.1103/PHYSREVLETT.98.171801.
@article{osti_20951267,
title = {Evidence for the Rare Decay B{sup +}{yields}D{sub s}{sup +}{pi}{sup 0}},
author = {Aubert, B. and Bona, M. and Boutigny, D. and Karyotakis, Y. and Lees, J. P. and Poireau, V. and Prudent, X. 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 have searched for the rare decay B{sup +}{yields}D{sub s}{sup +}{pi}{sup 0}. The analysis is based on a sample of 232x10{sup 6} {upsilon}(4S){yields}BB decays collected with the BABAR detector at the SLAC PEP-II e{sup +}e{sup -} storage ring. We find 19.6 signal events, corresponding to a significance of 4.7{sigma}. The extracted signal yield including statistical and systematic uncertainties is 20.1{sub -6.0-1.5}{sup +6.8+0.4}, and we measure B(B{sup +}{yields}D{sub s}{sup +}{pi}{sup 0})=(1.5{sub -0.4}{sup +0.5}{+-}0.1{+-}0.2)x10{sup -5}, where the first uncertainty is statistical, the second is systematic, and the last is due to the uncertainty on the D{sub s}{sup +} decay and its daughter decay branching fractions.},
doi = {10.1103/PHYSREVLETT.98.171801},
journal = {Physical Review Letters},
number = 17,
volume = 98,
place = {United States},
year = {Fri Apr 27 00:00:00 EDT 2007},
month = {Fri Apr 27 00:00:00 EDT 2007}
}
  • Using 355 pb{sup -1} of data collected by the CDF II detector in pp collisions at {radical}(s)=1.96 TeV at the Fermilab Tevatron, we study the fully reconstructed hadronic decays B{sub (s)}{sup 0}{yields}D{sub (s)}{sup -}{pi}{sup +} and B{sub (s)}{sup 0}{yields}D{sub (s)}{sup -}{pi}{sup +}{pi}{sup +}{pi}{sup -}. We present the first measurement of the ratio of branching fractions B(B{sub s}{sup 0}{yields}D{sub s}{sup -}{pi}{sup +}{pi}{sup +}{pi}{sup -})/B(B{sup 0}{yields}D{sup -}{pi}{sup +}{pi}{sup +}{pi}{sup -})=1.05{+-}0.10(stat){+-}0.22(syst). We also update our measurement of B(B{sub s}{sup 0}{yields}D{sub s}{sup -}{pi}{sup +})/B(B{sup 0}{yields}D{sup -}{pi}{sup +}) to 1.13{+-}0.08(stat){+-}0.23(syst), improving the statistical uncertainty by more than a factor of 2. We find B(B{sub s}{supmore » 0}{yields}D{sub s}{sup -}{pi}{sup +})=[3.8{+-}0.3(stat){+-}1.3(syst)]x10{sup -3} and B(B{sub s}{sup 0}{yields}D{sub s}{sup -}{pi}{sup +}{pi}{sup +}{pi}{sup -})=[8.4{+-}0.8(stat){+-}3.2(syst)]x10{sup -3}.« less
  • We have studied B{sub s}{sup 0}{yields}D{sub s}{sup -}{pi}{sup +} and B{sub s}{sup 0}{yields}D{sub s}{sup {+-}}K{sup {+-}} decays using 23.6 fb{sup -1} of data collected at the {upsilon}(5S) resonance with the Belle detector at the KEKB e{sup +}e{sup -} collider. This highly pure B{sub s}{sup 0}{yields}D{sub s}{sup -}{pi}{sup +} sample is used to measure the branching fraction, B(B{sub s}{sup 0}{yields}D{sub s}{sup -}{pi}{sup +})=[3.67{sub -0.33}{sup +0.35}(stat){sub -0.42}{sup +0.43}(syst){+-}0.49(f{sub s})]x10{sup -3} (f{sub s}=N{sub B{sub s}{sup (*)}B{sub s}{sup (*)}/N{sub bb}) and the fractions of B{sub s}{sup 0} event types at the {upsilon}(5S) energy, in particular N{sub B{sub s}*B{sub s}*}/N{sub B{sub s}(*)B{sub s}(*)}=(90.1{sub -4.0}{sup +3.8}{+-}0.2)%.more » We also determine the masses M(B{sub s}{sup 0})=(5364.4{+-}1.3{+-}0.7) MeV/c{sup 2} and M(B{sub s}*)=(5416.4{+-}0.4{+-}0.5) MeV/c{sup 2}. In addition, we observe B{sub s}{sup 0}{yields}D{sub s}{sup {+-}}K{sup {+-}} decays with a significance of 3.5{sigma} and measure B(B{sub s}{sup 0}{yields}D{sub s}{sup {+-}}K{sup {+-}})=[2.4{sub -1.0}{sup +1.2}(stat){+-}0.3(syst){+-}0.3(f{sub s})]x10{sup -4}.« less
  • We report an observation of the decay B{sub s}{sup 0}{yields}D{sub s}{sup -}{pi}{sup +} in pp collisions at {radical}(s)=1.96 TeV using 115 pb{sup -1} of data collected by the CDF II detector at the Fermilab Tevatron. We observe 83{+-}11(stat) B{sub s}{sup 0}{yields}D{sub s}{sup -}{pi}{sup +} candidates, representing a large increase in statistics over previous measurements and the first observation of this decay at a pp collider. We present the first measurement of the relative branching fraction B(B{sub s}{sup 0}{yields}D{sub s}{sup -}{pi}{sup +})/B(B{sup 0}{yields}D{sup -}{pi}{sup +})=1.32{+-}0.18(stat){+-}0.38(syst). We also measure B(B{sup +}{yields}D{sup 0}{pi}{sup +})/B(B{sup 0}{yields}D{sup -}{pi}{sup +})=1.97{+-}0.10(stat){+-}0.21(syst), which is consistent with previous measurements.
  • We report the measurement of the branching fractions of the rare decays B{sup 0}{yields}D{sub s}{sup (*)+}{pi}{sup -}, B{sup 0}{yields}D{sub s}{sup (*)+}{rho}{sup -}, and B{sup 0}{yields}D{sub s}{sup (*)-}K{sup (*)+} in a sample of 381x10{sup 6}{upsilon}(4S) decays into BB pairs collected with the BABAR detector at the PEP-II asymmetric-energy e{sup +}e{sup -} storage ring. We present evidence for the decay B{sup 0}{yields}D{sub s}{sup -}K*{sup +} and the vector-vector decays B{sup 0}{yields}D{sub s}*{sup +}{rho}{sup -} and B{sup 0}{yields}D{sub s}*{sup -}K*{sup +}, as well as the first measurement of the vector meson polarization in these decays. We also determine the ratios of the CKM-suppressedmore » to CKM-favored amplitudes r(D{sup (*)}{pi}) and r(D{sup (*)}{rho}) in decays B{sup 0}{yields}D{sup (*){+-}}{pi}{sup {+-}} and B{sup 0}{yields}D{sup (*){+-}}{rho}{sup {+-}}, and comment on the prospects for measuring the CP observable sin(2{beta}+{gamma})« less
  • We present a new measurement of the unitarity triangle angle {phi}{sub 3} using a Dalitz plot analysis of the K{sub S}{sup 0{pi}+{pi}-} decay of the neutral D meson produced in B{sup {+-}{yields}D(*)}K{sup {+-}} decays. The method exploits the interference between D{sup 0} and D{sup 0} to extract the angle {phi}{sub 3}, strong phase {delta}, and the ratio r of suppressed and allowed amplitudes. We apply this method to a 605 fb{sup -1} data sample collected by the Belle experiment. The analysis uses three decays: B{sup {+-}{yields}D}K{sup {+-}}, and B{sup {+-}{yields}D}*K{sup {+-}}with D*{yields}D{pi}{sup 0} and D*{yields}D{gamma}, as well as the correspondingmore » charge-conjugate modes. From a combined maximum likelihood fit to the three modes, we obtain {phi}{sub 3}=78.4 deg. (+10.8 deg./-11.6 deg.){+-}3.6 deg. (syst){+-}8.9 deg. (model). CP conservation in this process is ruled out at the confidence level (1-CL)=5x10{sup -4}, or 3.5 standard deviations.« less