Measurements of isospin asymmetry and difference of direct CP asymmetries in inclusive B →xsγ decays

(The Belle Collaboration)

doi:10.1103/PhysRevD.99.032012

Measurements of isospin asymmetry and difference of direct CP asymmetries in inclusive B →xsγ decays

(The Belle Collaboration)

Tohoku University
The Graduate University for Advanced Studies
High Energy Accelerator Research Organization, Tsukuba
The University of Tokyo
King Abdulaziz University
University of Tabuk
Brookhaven National Laboratory
Moscow Institute of Physics and Technology
Tata Institute of Fundamental Research
King Abdulaziz City for Science and Technology
The University of Sydney
Pacific Northwest National Laboratory
Indian Institute of Technology Madras
University of Göttingen
Austrian Academy of Sciences
Indian Institute of Science Education and Research Mohali
Indian Institute of Technology Guwahati
Charles University
Jožef Stefan Institute
RAS - Budker Institute of Nuclear Physics
Novosibirsk State University
Wayne State University
H. Niewodniczanski Institute of Nuclear Physics
University of Maribor
University of Hawai'i at Mānoa
Karlsruhe Institute of Technology
National Taiwan University
Hanyang University
RAS - P.N. Lebedev Physics Institute
Korea Institute of Science and Technology Information
Sungkyunkwan University
Indian Institute of Technology Hyderabad
German Electron Synchrotron
Université Paris-Sud
University of Bonn
Virginia Polytechnic Institute and State University

Research output: Contribution to journal › Article › peer-review

24 Scopus citations

Abstract

We report measurements of isospin asymmetry Δ0- and difference of direct CP asymmetries ΔACP between charged and neutral B→Xsγ decays. This analysis is based on the data sample containing 772×106BB̄ pairs that was collected with the Belle detector at the KEKB energy-asymmetric e+e- collider. Using a sum-of-exclusive technique with invariant Xs mass up to 2.8 GeV/c2, we obtain Δ0-=[-0.48±1.49(stat)±0.97(syst)±1.15(f+-/f00)]% and ΔACP=[+3.69±2.65(stat)±0.76(syst)]%, where the last uncertainty for Δ0- is due to the uncertainty on the production ratio of B+B- to B0B̄0 in Ï (4S) decays. The measured value of Δ0- is consistent with zero, allowing us to constrain the resolved photon contribution in the B→Xsγ, and improve the branching fraction prediction. The result for ΔACP is consistent with the prediction of the SM. We also measure the direct CP asymmetries for charged and neutral B→Xsγ decays. All the measurements are the most precise to date.

Original language	English
Article number	032012
Journal	Physical Review D
Volume	99
Issue number	3
DOIs	https://doi.org/10.1103/PhysRevD.99.032012
State	Published - 1 Feb 2019

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10.1103/PhysRevD.99.032012

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@article{e5cd8ed4f3ba4c7ba32fbce0e70ede9a,

title = "Measurements of isospin asymmetry and difference of direct CP asymmetries in inclusive B →xsγ decays",

abstract = "We report measurements of isospin asymmetry Δ0- and difference of direct CP asymmetries ΔACP between charged and neutral B→Xsγ decays. This analysis is based on the data sample containing 772×106B{\=B} pairs that was collected with the Belle detector at the KEKB energy-asymmetric e+e- collider. Using a sum-of-exclusive technique with invariant Xs mass up to 2.8 GeV/c2, we obtain Δ0-=[-0.48±1.49(stat)±0.97(syst)±1.15(f+-/f00)]\% and ΔACP=[+3.69±2.65(stat)±0.76(syst)]\%, where the last uncertainty for Δ0- is due to the uncertainty on the production ratio of B+B- to B0{\=B}0 in {\"I} (4S) decays. The measured value of Δ0- is consistent with zero, allowing us to constrain the resolved photon contribution in the B→Xsγ, and improve the branching fraction prediction. The result for ΔACP is consistent with the prediction of the SM. We also measure the direct CP asymmetries for charged and neutral B→Xsγ decays. All the measurements are the most precise to date.",

author = "\{(The Belle Collaboration)\} and S. Watanuki and A. Ishikawa and I. Adachi and H. Aihara and \{Al Said\}, S. and Asner, \{D. M.\} and T. Aushev and R. Ayad and V. Babu and I. Badhrees and Bakich, \{A. M.\} and V. Bansal and P. Behera and C. Bele{\~n}o and M. Berger and V. Bhardwaj and B. Bhuyan and T. Bilka and J. Biswal and A. Bobrov and G. Bonvicini and A. Bozek and M. Bra{\v c}ko and Browder, \{T. E.\} and L. Cao and D. {\v C}ervenkov and P. Chang and Cheon, \{B. G.\} and K. Chilikin and K. Cho and Y. Choi and S. Choudhury and D. Cinabro and S. Cunliffe and \{Di Carlo\}, S. and J. Dingfelder and Dong, \{T. V.\} and S. Eidelman and D. Epifanov and Fast, \{J. E.\} and T. Ferber and A. Frey and Fulsom, \{B. G.\} and V. Gaur and N. Gabyshev and A. Garmash and M. Gelb and A. Giri and P. Goldenzweig and H. Park",

note = "Publisher Copyright: {\textcopyright} 2019 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the https://creativecommons.org/licenses/by/4.0/ Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Funded by SCOAP . ",

year = "2019",

month = feb,

day = "1",

doi = "10.1103/PhysRevD.99.032012",

language = "English",

volume = "99",

journal = "Physical Review D",

issn = "2470-0010",

publisher = "American Physical Society",

number = "3",

}

TY - JOUR

T1 - Measurements of isospin asymmetry and difference of direct CP asymmetries in inclusive B →xsγ decays

AU - (The Belle Collaboration)

AU - Watanuki, S.

AU - Ishikawa, A.

AU - Adachi, I.

AU - Aihara, H.

AU - Al Said, S.

AU - Asner, D. M.

AU - Aushev, T.

AU - Ayad, R.

AU - Babu, V.

AU - Badhrees, I.

AU - Bakich, A. M.

AU - Bansal, V.

AU - Behera, P.

AU - Beleño, C.

AU - Berger, M.

AU - Bhardwaj, V.

AU - Bhuyan, B.

AU - Bilka, T.

AU - Biswal, J.

AU - Bobrov, A.

AU - Bonvicini, G.

AU - Bozek, A.

AU - Bračko, M.

AU - Browder, T. E.

AU - Cao, L.

AU - Červenkov, D.

AU - Chang, P.

AU - Cheon, B. G.

AU - Chilikin, K.

AU - Cho, K.

AU - Choi, Y.

AU - Choudhury, S.

AU - Cinabro, D.

AU - Cunliffe, S.

AU - Di Carlo, S.

AU - Dingfelder, J.

AU - Dong, T. V.

AU - Eidelman, S.

AU - Epifanov, D.

AU - Fast, J. E.

AU - Ferber, T.

AU - Frey, A.

AU - Fulsom, B. G.

AU - Gaur, V.

AU - Gabyshev, N.

AU - Garmash, A.

AU - Gelb, M.

AU - Giri, A.

AU - Goldenzweig, P.

AU - Park, H.

N1 - Publisher Copyright: © 2019 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the https://creativecommons.org/licenses/by/4.0/ Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Funded by SCOAP .

PY - 2019/2/1

Y1 - 2019/2/1

N2 - We report measurements of isospin asymmetry Δ0- and difference of direct CP asymmetries ΔACP between charged and neutral B→Xsγ decays. This analysis is based on the data sample containing 772×106BB̄ pairs that was collected with the Belle detector at the KEKB energy-asymmetric e+e- collider. Using a sum-of-exclusive technique with invariant Xs mass up to 2.8 GeV/c2, we obtain Δ0-=[-0.48±1.49(stat)±0.97(syst)±1.15(f+-/f00)]% and ΔACP=[+3.69±2.65(stat)±0.76(syst)]%, where the last uncertainty for Δ0- is due to the uncertainty on the production ratio of B+B- to B0B̄0 in Ï (4S) decays. The measured value of Δ0- is consistent with zero, allowing us to constrain the resolved photon contribution in the B→Xsγ, and improve the branching fraction prediction. The result for ΔACP is consistent with the prediction of the SM. We also measure the direct CP asymmetries for charged and neutral B→Xsγ decays. All the measurements are the most precise to date.

AB - We report measurements of isospin asymmetry Δ0- and difference of direct CP asymmetries ΔACP between charged and neutral B→Xsγ decays. This analysis is based on the data sample containing 772×106BB̄ pairs that was collected with the Belle detector at the KEKB energy-asymmetric e+e- collider. Using a sum-of-exclusive technique with invariant Xs mass up to 2.8 GeV/c2, we obtain Δ0-=[-0.48±1.49(stat)±0.97(syst)±1.15(f+-/f00)]% and ΔACP=[+3.69±2.65(stat)±0.76(syst)]%, where the last uncertainty for Δ0- is due to the uncertainty on the production ratio of B+B- to B0B̄0 in Ï (4S) decays. The measured value of Δ0- is consistent with zero, allowing us to constrain the resolved photon contribution in the B→Xsγ, and improve the branching fraction prediction. The result for ΔACP is consistent with the prediction of the SM. We also measure the direct CP asymmetries for charged and neutral B→Xsγ decays. All the measurements are the most precise to date.

UR - https://www.scopus.com/pages/publications/85062599280

U2 - 10.1103/PhysRevD.99.032012

DO - 10.1103/PhysRevD.99.032012

M3 - Article

AN - SCOPUS:85062599280

SN - 2470-0010

VL - 99

JO - Physical Review D

JF - Physical Review D

IS - 3

M1 - 032012

ER -

Measurements of isospin asymmetry and difference of direct CP asymmetries in inclusive B →xsγ decays

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