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Title: Measurement of CP violation in B{sup 0}{yields}D*{sup -}{pi}{sup +} and B{sup 0}{yields}D{sup -}{pi}{sup +} decays

Abstract

We report measurements of time-dependent decay rates for B{sup 0}{yields}D{sup (*)-}{pi}{sup +} decays and extraction of CP violation parameters that depend on {phi}{sub 3}. Using fully reconstructed D{sup (*)}{pi} events and partially reconstructed D*{pi} events from a data sample that contains 386x10{sup 6} BB pairs that was collected near the {upsilon}(4S) resonance, with the Belle detector at the KEKB asymmetric energy e{sup +}e{sup -} collider, we obtain the CP violation parameters S{sup +}(D{sup (*)}{pi}) and S{sup -}(D{sup (*)}{pi}). We obtain S{sup +}(D*{pi})=0.049{+-}0.020(stat){+-}0.011(sys), S{sup -}(D*{pi})=0.031{+-}0.019(stat){+-}0.011(sys), and S{sup +}(D{pi})=0.031{+-}0.030(stat){+-}0.012(sys), S{sup -}(D{pi})=0.068{+-}0.029(stat){+-}0.012(sys). These results are an indication of CP violation in B{sup 0}{yields}D*{sup -}{pi}{sup +} and B{sup 0}{yields}D{sup -}{pi}{sup +} decays at the 2.5{sigma} and 2.2{sigma} levels, respectively. If we use the values of R{sub D{sup (*}}{pi}} that are derived using assumptions of factorization and SU(3) symmetry, branching fraction measurements for the B{yields}D{sub s}{sup (*)}{pi} modes, and lattice QCD calculations, we can restrict the allowed region of |sin(2{phi}{sub 1}+{phi}{sub 3})| to be above 0.44 and 0.52 at 68% confidence level from the D*{pi} and D{pi} modes, respectively.

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ;  [1]
  1. High Energy Accelerator Research Organization (KEK), Tsukuba (Japan) (and others)
Publication Date:
OSTI Identifier:
20782965
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. D, Particles Fields; Journal Volume: 73; Journal Issue: 9; Other Information: DOI: 10.1103/PhysRevD.73.092003; (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 NEUTRAL MESONS; BRANCHING RATIO; CP INVARIANCE; D MESONS; D S MESONS; D*-2010 MESONS; FACTORIZATION; MULTIPARTICLE SPECTROMETERS; PARTICLE DECAY; PIONS MINUS; PIONS PLUS; QUANTUM CHROMODYNAMICS; SU-3 GROUPS; TIME DEPENDENCE; UPSILON-10580 MESONS

Citation Formats

Ronga, F.J., Sarangi, T.R., Abe, K., Adachi, I., Gershon, T., Haba, J., Hara, K., Hazumi, M., Higuchi, T., Itoh, R., Iwasaki, Y., Limosani, A., Nakamura, I., Nishida, S., Nozaki, T., Sakai, Y., Stamen, R., Suzuki, S.Y., Takasaki, F., and Tanaka, M. Measurement of CP violation in B{sup 0}{yields}D*{sup -}{pi}{sup +} and B{sup 0}{yields}D{sup -}{pi}{sup +} decays. United States: N. p., 2006. Web. doi:10.1103/PHYSREVD.73.092003.
Ronga, F.J., Sarangi, T.R., Abe, K., Adachi, I., Gershon, T., Haba, J., Hara, K., Hazumi, M., Higuchi, T., Itoh, R., Iwasaki, Y., Limosani, A., Nakamura, I., Nishida, S., Nozaki, T., Sakai, Y., Stamen, R., Suzuki, S.Y., Takasaki, F., & Tanaka, M. Measurement of CP violation in B{sup 0}{yields}D*{sup -}{pi}{sup +} and B{sup 0}{yields}D{sup -}{pi}{sup +} decays. United States. doi:10.1103/PHYSREVD.73.092003.
Ronga, F.J., Sarangi, T.R., Abe, K., Adachi, I., Gershon, T., Haba, J., Hara, K., Hazumi, M., Higuchi, T., Itoh, R., Iwasaki, Y., Limosani, A., Nakamura, I., Nishida, S., Nozaki, T., Sakai, Y., Stamen, R., Suzuki, S.Y., Takasaki, F., and Tanaka, M. Mon . "Measurement of CP violation in B{sup 0}{yields}D*{sup -}{pi}{sup +} and B{sup 0}{yields}D{sup -}{pi}{sup +} decays". United States. doi:10.1103/PHYSREVD.73.092003.
@article{osti_20782965,
title = {Measurement of CP violation in B{sup 0}{yields}D*{sup -}{pi}{sup +} and B{sup 0}{yields}D{sup -}{pi}{sup +} decays},
author = {Ronga, F.J. and Sarangi, T.R. and Abe, K. and Adachi, I. and Gershon, T. and Haba, J. and Hara, K. and Hazumi, M. and Higuchi, T. and Itoh, R. and Iwasaki, Y. and Limosani, A. and Nakamura, I. and Nishida, S. and Nozaki, T. and Sakai, Y. and Stamen, R. and Suzuki, S.Y. and Takasaki, F. and Tanaka, M.},
abstractNote = {We report measurements of time-dependent decay rates for B{sup 0}{yields}D{sup (*)-}{pi}{sup +} decays and extraction of CP violation parameters that depend on {phi}{sub 3}. Using fully reconstructed D{sup (*)}{pi} events and partially reconstructed D*{pi} events from a data sample that contains 386x10{sup 6} BB pairs that was collected near the {upsilon}(4S) resonance, with the Belle detector at the KEKB asymmetric energy e{sup +}e{sup -} collider, we obtain the CP violation parameters S{sup +}(D{sup (*)}{pi}) and S{sup -}(D{sup (*)}{pi}). We obtain S{sup +}(D*{pi})=0.049{+-}0.020(stat){+-}0.011(sys), S{sup -}(D*{pi})=0.031{+-}0.019(stat){+-}0.011(sys), and S{sup +}(D{pi})=0.031{+-}0.030(stat){+-}0.012(sys), S{sup -}(D{pi})=0.068{+-}0.029(stat){+-}0.012(sys). These results are an indication of CP violation in B{sup 0}{yields}D*{sup -}{pi}{sup +} and B{sup 0}{yields}D{sup -}{pi}{sup +} decays at the 2.5{sigma} and 2.2{sigma} levels, respectively. If we use the values of R{sub D{sup (*}}{pi}} that are derived using assumptions of factorization and SU(3) symmetry, branching fraction measurements for the B{yields}D{sub s}{sup (*)}{pi} modes, and lattice QCD calculations, we can restrict the allowed region of |sin(2{phi}{sub 1}+{phi}{sub 3})| to be above 0.44 and 0.52 at 68% confidence level from the D*{pi} and D{pi} modes, respectively.},
doi = {10.1103/PHYSREVD.73.092003},
journal = {Physical Review. D, Particles Fields},
number = 9,
volume = 73,
place = {United States},
year = {Mon May 01 00:00:00 EDT 2006},
month = {Mon May 01 00:00:00 EDT 2006}
}
  • We study the decays B{sup -}{yields}D{sup 0}{pi}{sup -} and B{sup -}{yields}D{sup 0}K{sup -}, where the D{sup 0} decays into D{sup 0}{pi}{sup 0}, with the D{sup 0} reconstructed in the CP-even (CP+) eigenstates K{sup -}K{sup +} and {pi}{sup -}{pi}{sup +} and in the (non-CP) channels K{sup -}{pi}{sup +}, K{sup -}{pi}{sup +}{pi}{sup +}{pi}{sup -}, and K{sup -}{pi}{sup +}{pi}{sup 0}. Using a sample of about 123x10{sup 6} BB pairs, we measure the ratios of decay rates R{sub non-CP}{sup {identical_to}}(B(B{sup -}{yields}D{sub non-CP}{sup 0}K{sup -})/B(B{sup -}{yields}D{sub non-CP}{sup 0}{pi}{sup -}))=0.0813{+-}= 0.0040(stat){sub -0.0031} {sup +0.0042}(syst), and provide the first measurements of R{sub CP+}{sup {identical_to}}(B(B{sup -}{yields}D{sub CP+}{sup 0}K{supmore » -})/B(B{sup -}{yields}D{sub CP+}{sup 0}{pi}{sup -}))=0.086{+-}0.021(stat){+-}0.007(syst), and of the CP asymmetry A{sub CP+}{sup {identical_to}}(B(B{sup -}{yields}D{sub CP+}{sup 0}K{sup -})-B(B{sup +}{yields}D{sub CP+}{sup 0}K{sup +})/B(B{sup -}{yields}D{sub CP+}{sup 0}K{sup -})+B(= B{sup +}{yields}D{sub CP+}{sup 0}K{sup +}))=-0.10{+-}0.23 (stat){sub -0.04}{sup +0.03}(syst)« less
  • Using 281 fb{sup -1} of data from the Belle experiment recorded at or near the {upsilon}(4S) resonance, we have measured the rates of the ''wrong-sign'' decays D{sup 0}{yields}K{sup +}{pi}{sup -}{pi}{sup 0} and D{sup 0}{yields}K{sup +}{pi}{sup -}{pi}{sup +}{pi}{sup -} relative to those of the Cabibbo-favored decays D{sup 0}{yields}K{sup -}{pi}{sup +}{pi}{sup 0} and D{sup 0}{yields}K{sup -}{pi}{sup +}{pi}{sup +}{pi}{sup -}. These wrong-sign decays proceed via a doubly Cabibbo-suppressed amplitude or via D{sup 0}-D{sup 0} mixing; the latter has not yet been observed. We obtain R{sub WS}(K{pi}{pi}{sup 0})=[0.229{+-}0.015(stat){sub -0.009}{sup +0.013}(syst)]% and R{sub WS}(K3{pi})=[0.320{+-}0.018(stat){sub -0.013}{sup +0.018}(syst)]%. The CP asymmetries are measured to be -0.006{+-}0.053 andmore » -0.018{+-}0.044 for the K{sup +}{pi}{sup -}{pi}{sup 0} and K{sup +}{pi}{sup -}{pi}{sup +}{pi}{sup -} final states, respectively.« less
  • We present a measurement of the time-dependent asymmetry in the rate for {ovr B}{sub d}{sup 0} versus B{sub d}{sup 0} decays to J/{psi}K{sub s}{sup 0}. A nonzero asymmetry would be an indication of CP violation, and within the standard model this may be used to measure the CP-violation parameter sin(2{beta}). A total of 198{+-}17 B{sub d}{sup 0}/{ovr B}{sub d}{sup 0} decays were observed in p{ovr p} collisions at sqrt[s] = 1.8 TeV by the CDF detector at the Fermilab Tevatron. B{sub d}{sup 0} and {ovr B}{sub d}{sup 0} are distinguished by a technique based on charge correlations from hadronization ofmore » the b quark. Our analysis results in sin(2{beta}) = 1.8{+-}1.1(stat){+-}0.3(syst).« less
  • The charm quark offers interesting opportunities to cross check the mechanism of CP violation precisely tested in the strange and beauty sectors. In this paper, we exploit the angular and quantum correlations in the DD pairs produced through the decay of the {psi}(3770) resonance in a charm factory to investigate CP-violation in two different ways. We build CP-violating observables in {psi}(3770){yields}DD{yields}(V{sub 1}V{sub 2})(V{sub 3}V{sub 4}) to isolate specific new physics effects in the charm sector. We also consider the case of {psi}(3770){yields}DD{yields}(V{sub 1}V{sub 2})(K{pi}) decays, which provide a new way to measure the strong phase difference {delta} between Cabibbo- favoredmore » and doubly-Cabibbo suppressed D decays required in the determination of the Cabibbo-Kobayashi-Maskawa quark-mixing matrix angle {gamma}. Neglecting the systematics, we give a first rough estimate of the sensitivities of these measurements at BES-III with an integrated luminosity of 20 fb{sup -1} at {psi}(3770) peak and at a future Super {tau}-charm factory with a luminosity of 10{sup 35} cm{sup -2} s{sup -1}.« less
  • 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