Here, we report the first evidence for isospin violation in B → K*γ and the first measurement of the difference of CP asymmetries between B+→K*+γ and B0 → K*0γ. This analysis is based on the data sample containing 772 × 106$$B\overline{B}$$ pairs that was collected with the Belle detector at the KEKB energy-asymmetric e+e- collider. We find evidence for the isospin violation with a significance of 3.1σ, Δ0+ = [+6.2 ± 1.5(stat) ± 0.6(syst) ± 1.2(f+-/ f00)]% , where the third uncertainty is due to the uncertainty on the fraction of B+B- to B0B0 production in Υ(4S) decays. The measured value is consistent with predictions of the standard model. The result for the difference of CP asymmetries is ΔACP = [+2.4 ± 2.8(stat)± 0.5(syst)]% , consistent with zero. The measured branching fractions and CP asymmetries for charged and neutral B meson decays are the most precise to date. Finally, we also calculate the ratio of branching fractions of B0 → K*0γ to B$$0\atop{s}$$ → Φγ.
Horiguchi, T., Ishikawa, A., Yamamoto, H., Adachi, I., Aihara, H., Al Said, S., Asner, D. M., Aulchenko, V., Aushev, T., Ayad, R., Babu, V., Badhrees, I., Bakich, A. M., Bansal, V., Behera, P., Bhardwaj, V., Bhuyan, B., Biswal, J., ... Zupanc, A. (2017). Evidence for Isospin Violation and Measurement of <math display='inline'><mi>C</mi><mi>P</mi></math> Asymmetries in <math display='inline'><mi>B</mi><mo stretchy='false'>→</mo><msup><mi>K</mi><mo>*</mo></msup><mo stretchy='false'>(</mo><mn>892</mn><mo stretchy='false'>)</mo><mi>γ</mi></math>. Physical Review Letters, 119(19). https://doi.org/10.1103/PhysRevLett.119.191802
@article{osti_1430715,
author = {Horiguchi, T. and Ishikawa, A. and Yamamoto, H. and Adachi, I. and Aihara, H. and Al Said, S. and Asner, D. M. and Aulchenko, V. and Aushev, T. and Ayad, R. and others},
title = {Evidence for Isospin Violation and Measurement of <math display='inline'><mi>C</mi><mi>P</mi></math> Asymmetries in <math display='inline'><mi>B</mi><mo stretchy='false'>→</mo><msup><mi>K</mi><mo>*</mo></msup><mo stretchy='false'>(</mo><mn>892</mn><mo stretchy='false'>)</mo><mi>γ</mi></math>},
annote = {Here, we report the first evidence for isospin violation in B → K*γ and the first measurement of the difference of CP asymmetries between B+→K*+γ and B0 → K*0γ. This analysis is based on the data sample containing 772 × 106$B\overline{B}$ pairs that was collected with the Belle detector at the KEKB energy-asymmetric e+e- collider. We find evidence for the isospin violation with a significance of 3.1σ, Δ0+ = [+6.2 ± 1.5(stat) ± 0.6(syst) ± 1.2(f+-/ f00)]% , where the third uncertainty is due to the uncertainty on the fraction of B+B- to B0B0 production in Υ(4S) decays. The measured value is consistent with predictions of the standard model. The result for the difference of CP asymmetries is ΔACP = [+2.4 ± 2.8(stat)± 0.5(syst)]% , consistent with zero. The measured branching fractions and CP asymmetries for charged and neutral B meson decays are the most precise to date. Finally, we also calculate the ratio of branching fractions of B0 → K*0γ to B$0\atop{s}$ → Φγ.},
doi = {10.1103/PhysRevLett.119.191802},
url = {https://www.osti.gov/biblio/1430715},
journal = {Physical Review Letters},
issn = {ISSN PRLTAO},
number = {19},
volume = {119},
place = {United States},
publisher = {American Physical Society (APS)},
year = {2017},
month = {11}}
Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States); Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
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