Evidence for Isospin Violation and Measurement of CP Asymmetries in B →k∗ (892)γ

Belle Collaboration

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

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 772×106BB 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 (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. We also calculate the ratio of branching fractions of B0→K∗0γ to Bs0→φγ.

Original languageEnglish
Article number191802
JournalPhysical Review Letters
Volume119
Issue number19
DOIs
Publication statusPublished - 2017 Nov 7

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asymmetry
decay
mesons
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  • Physics and Astronomy(all)

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Evidence for Isospin Violation and Measurement of CP Asymmetries in B →k∗ (892)γ. / Belle Collaboration.

In: Physical Review Letters, Vol. 119, No. 19, 191802, 07.11.2017.

Research output: Contribution to journalArticle

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abstract = "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 772×106BB 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 (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. We also calculate the ratio of branching fractions of B0→K∗0γ to Bs0→φγ.",
author = "{Belle Collaboration} and T. Horiguchi and A. Ishikawa and H. Yamamoto and I. Adachi and H. Aihara and {Al Said}, S. and Asner, {D. M.} and V. Aulchenko and T. Aushev and R. Ayad and V. Babu and I. Badhrees and Bakich, {A. M.} and V. Bansal and P. Behera and V. Bhardwaj and B. Bhuyan and J. Biswal and A. Bobrov and G. Bonvicini and A. Bozek and M. Bračko and Browder, {T. E.} and D. Červenkov and V. Chekelian and A. Chen and Cheon, {B. G.} and K. Chilikin and K. Cho and Y. Choi and D. Cinabro and T. Czank and N. Dash and {Di Carlo}, S. and Z. DoleŽal and Z. Dr{\'a}sal and D. Dutta and S. Eidelman and D. Epifanov and H. Farhat and Fast, {J. E.} and T. Ferber and Fulsom, {B. G.} and V. Gaur and N. Gabyshev and A. Garmash and M. Gelb and R. Gillard and P. Goldenzweig and Eunil Won",
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AU - Horiguchi, T.

AU - Ishikawa, A.

AU - Yamamoto, H.

AU - Adachi, I.

AU - Aihara, H.

AU - Al Said, S.

AU - Asner, D. M.

AU - Aulchenko, V.

AU - Aushev, T.

AU - Ayad, R.

AU - Babu, V.

AU - Badhrees, I.

AU - Bakich, A. M.

AU - Bansal, V.

AU - Behera, P.

AU - Bhardwaj, V.

AU - Bhuyan, B.

AU - Biswal, J.

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AU - Chekelian, V.

AU - Chen, A.

AU - Cheon, B. G.

AU - Chilikin, K.

AU - Cho, K.

AU - Choi, Y.

AU - Cinabro, D.

AU - Czank, T.

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AU - Di Carlo, S.

AU - DoleŽal, Z.

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AU - Dutta, D.

AU - Eidelman, S.

AU - Epifanov, D.

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AU - Fast, J. E.

AU - Ferber, T.

AU - Fulsom, B. G.

AU - Gaur, V.

AU - Gabyshev, N.

AU - Garmash, A.

AU - Gelb, M.

AU - Gillard, R.

AU - Goldenzweig, P.

AU - Won, Eunil

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N2 - 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 772×106BB 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 (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. We also calculate the ratio of branching fractions of B0→K∗0γ to Bs0→φγ.

AB - 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 772×106BB 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 (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. We also calculate the ratio of branching fractions of B0→K∗0γ to Bs0→φγ.

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