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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}
}