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Title: Measurements of isospin asymmetry and difference of direct C P asymmetries in inclusive B → X s γ decays

Abstract

We report measurements of isospin asymmetry $${\mathrm{{\Delta}}}_{0{-}}$$ and difference of direct $CP$ asymmetries $$\mathrm{{\Delta}}{A}_{CP}$$ between charged and neutral $$B{\rightarrow}{X}_{s}{\gamma}$$ decays. This analysis is based on the data sample containing $$772\times{}{10}^{6}B\overline{B}$$ pairs that was collected with the Belle detector at the KEKB energy-asymmetric $${e}^{+}{e}^{{-}}$$ collider. Using a sum-of-exclusive technique with invariant $${X}_{s}$$ mass up to $$2.8\text{ }\text{ }\mathrm{GeV}/{c}^{2}$$, we obtain $${\mathrm{{\Delta}}}_{0{-}}=[{-}0.48\pm{}1.49(\mathrm{stat})\pm{}0.97(\mathrm{syst})\pm{}1.15({f}_{+{-}}/{f}_{00})]$$% and $$\mathrm{{\Delta}}{A}_{CP}=[+3.69\pm{}2.65(\mathrm{stat})\pm{}0.76(\mathrm{syst})]$$%, where the last uncertainty for $${\mathrm{{\Delta}}}_{0{-}}$$ is due to the uncertainty on the production ratio of $${B}^{+}{B}^{{-}}$$ to $${B}^{0}{\overline{B}}^{0}$$ in $$\mathrm{{\Upsilon}}(4S)$$ decays. The measured value of $${\mathrm{{\Delta}}}_{0{-}}$$ is consistent with zero, allowing us to constrain the resolved photon contribution in the $$B{\rightarrow}{X}_{s}{\gamma}$$, and improve the branching fraction prediction. The result for $$\mathrm{{\Delta}}{A}_{CP}$$ is consistent with the prediction of the SM. We also measure the direct $CP$ asymmetries for charged and neutral $$B{\rightarrow}{X}_{s}{\gamma}$$ decays. All the measurements are the most precise to date.

Authors:
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Publication Date:
Research Org.:
Brookhaven National Laboratory (BNL), Upton, NY (United States); Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States); Univ. of Hawaii, Honolulu, HI (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP); National Science Foundation (NSF)
Contributing Org.:
The Belle Collaboration
OSTI Identifier:
1495246
Alternate Identifier(s):
OSTI ID: 1501588; OSTI ID: 1593808
Report Number(s):
BNL-211368-2019-JAAM; arXiv:1807.04236v4
Journal ID: ISSN 2470-0010; PRVDAQ; 032012
Grant/Contract Number:  
SC0012704; SC0009973; SC0010504
Resource Type:
Published Article
Journal Name:
Physical Review. D.
Additional Journal Information:
Journal Name: Physical Review. D. Journal Volume: 99 Journal Issue: 3; Journal ID: ISSN 2470-0010
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; flavor changing neutral currents; leptonic, semileptonic & radiative decays; particle decays; particle interactions; rare decays; bottom quark; photons; strange quark; CP symmetry; CP violation

Citation Formats

Watanuki, S., Ishikawa, A., Adachi, I., Aihara, H., Al Said, S., Asner, D. M., Aushev, T., Ayad, R., Babu, V., Badhrees, I., Bakich, A. M., Bansal, V., Behera, P., Beleño, C., Berger, M., Bhardwaj, V., Bhuyan, B., Bilka, T., Biswal, J., Bobrov, A., Bonvicini, G., Bozek, A., Bračko, M., Browder, T. E., Cao, L., Červenkov, D., Chang, P., Cheon, B. G., Chilikin, K., Cho, K., Choi, Y., Choudhury, S., Cinabro, D., Cunliffe, S., Di Carlo, S., Dingfelder, J., Dong, T. V., Eidelman, S., Epifanov, D., Fast, J. E., Ferber, T., Frey, A., Fulsom, B. G., Gaur, V., Gabyshev, N., Garmash, A., Gelb, M., Giri, A., Goldenzweig, P., Guan, Y., Guido, E., Haba, J., Hayasaka, K., Hayashii, H., Hou, W. -S., Iijima, T., Inami, K., Inguglia, G., Itoh, R., Iwasaki, M., Iwasaki, Y., Jacobs, W. W., Jaegle, I., Jeon, H. B., Jia, S., Jin, Y., Joo, K. K., Julius, T., Karyan, G., Kawasaki, T., Kiesling, C., Kim, D. Y., Kim, J. B., Kim, S. H., Kinoshita, K., Kodyš, P., Korpar, S., Kotchetkov, D., Križan, P., Kroeger, R., Krokovny, P., Kuhr, T., Kumar, R., Kuzmin, A., Kwon, Y. -J., Lee, I. S., Lee, S. C., Li, L. K., Li, Y. B., Li Gioi, L., Libby, J., Liventsev, D., Lubej, M., Luo, T., Masuda, M., Matsuda, T., Merola, M., Miyabayashi, K., Miyata, H., Mizuk, R., Mohanty, G. B., Mori, T., Nakao, M., Nanut, T., Nath, K. J., Niiyama, M., Nishida, S., Nishimura, K., Ogawa, K., Ogawa, S., Okuno, S., Ono, H., Ostrowicz, W., Pakhlov, P., Pakhlova, G., Pal, B., Park, H., Paul, S., Pedlar, T. K., Pestotnik, R., Piilonen, L. E., Prencipe, E., Ritter, M., Rostomyan, A., Russo, G., Sakai, Y., Sandilya, S., Santelj, L., Savinov, V., Schneider, O., Schnell, G., Schueler, J., Schwanda, C., Schwartz, A. J., Seino, Y., Senyo, K., Seon, O., Shebalin, V., Shibata, T. -A., Shiu, J. -G., Shwartz, B., Sokolov, A., Solovieva, E., Stanič, S., Starič, M., Sumiyoshi, T., Sutcliffe, W., Takizawa, M., Tanida, K., Taniguchi, N., Tenchini, F., Uchida, M., Uglov, T., Unno, Y., Uno, S., Vahsen, S. E., Van Hulse, C., Van Tonder, R., Varner, G., Varvell, K. E., Vossen, A., Wang, B., Wang, C. H., Wang, M. -Z., Wang, P., Watanabe, M., Widmann, E., Won, E., Ye, H., Yin, J. H., Yusa, Y., Zakharov, S., Zhang, Z. P., Zhilich, V., Zhukova, V., Zhulanov, V., Zupanc, A., and The Belle Collaboration. Measurements of isospin asymmetry and difference of direct C P asymmetries in inclusive B → X s γ decays. United States: N. p., 2019. Web. doi:10.1103/PhysRevD.99.032012.
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Watanuki, S., Ishikawa, A., Adachi, I., Aihara, H., Al Said, S., Asner, D. M., Aushev, T., Ayad, R., Babu, V., Badhrees, I., Bakich, A. M., Bansal, V., Behera, P., Beleño, C., Berger, M., Bhardwaj, V., Bhuyan, B., Bilka, T., Biswal, J., Bobrov, A., Bonvicini, G., Bozek, A., Bračko, M., Browder, T. E., Cao, L., Červenkov, D., Chang, P., Cheon, B. G., Chilikin, K., Cho, K., Choi, Y., Choudhury, S., Cinabro, D., Cunliffe, S., Di Carlo, S., Dingfelder, J., Dong, T. V., Eidelman, S., Epifanov, D., Fast, J. E., Ferber, T., Frey, A., Fulsom, B. G., Gaur, V., Gabyshev, N., Garmash, A., Gelb, M., Giri, A., Goldenzweig, P., Guan, Y., Guido, E., Haba, J., Hayasaka, K., Hayashii, H., Hou, W. -S., Iijima, T., Inami, K., Inguglia, G., Itoh, R., Iwasaki, M., Iwasaki, Y., Jacobs, W. W., Jaegle, I., Jeon, H. B., Jia, S., Jin, Y., Joo, K. K., Julius, T., Karyan, G., Kawasaki, T., Kiesling, C., Kim, D. Y., Kim, J. B., Kim, S. H., Kinoshita, K., Kodyš, P., Korpar, S., Kotchetkov, D., Križan, P., Kroeger, R., Krokovny, P., Kuhr, T., Kumar, R., Kuzmin, A., Kwon, Y. -J., Lee, I. S., Lee, S. C., Li, L. K., Li, Y. B., Li Gioi, L., Libby, J., Liventsev, D., Lubej, M., Luo, T., Masuda, M., Matsuda, T., Merola, M., Miyabayashi, K., Miyata, H., Mizuk, R., Mohanty, G. B., Mori, T., Nakao, M., Nanut, T., Nath, K. J., Niiyama, M., Nishida, S., Nishimura, K., Ogawa, K., Ogawa, S., Okuno, S., Ono, H., Ostrowicz, W., Pakhlov, P., Pakhlova, G., Pal, B., Park, H., Paul, S., Pedlar, T. K., Pestotnik, R., Piilonen, L. E., Prencipe, E., Ritter, M., Rostomyan, A., Russo, G., Sakai, Y., Sandilya, S., Santelj, L., Savinov, V., Schneider, O., Schnell, G., Schueler, J., Schwanda, C., Schwartz, A. J., Seino, Y., Senyo, K., Seon, O., Shebalin, V., Shibata, T. -A., Shiu, J. -G., Shwartz, B., Sokolov, A., Solovieva, E., Stanič, S., Starič, M., Sumiyoshi, T., Sutcliffe, W., Takizawa, M., Tanida, K., Taniguchi, N., Tenchini, F., Uchida, M., Uglov, T., Unno, Y., Uno, S., Vahsen, S. E., Van Hulse, C., Van Tonder, R., Varner, G., Varvell, K. E., Vossen, A., Wang, B., Wang, C. H., Wang, M. -Z., Wang, P., Watanabe, M., Widmann, E., Won, E., Ye, H., Yin, J. H., Yusa, Y., Zakharov, S., Zhang, Z. P., Zhilich, V., Zhukova, V., Zhulanov, V., Zupanc, A., & The Belle Collaboration. Measurements of isospin asymmetry and difference of direct C P asymmetries in inclusive B → X s γ decays. United States. https://doi.org/10.1103/PhysRevD.99.032012
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Watanuki, S., Ishikawa, A., Adachi, I., Aihara, H., Al Said, S., Asner, D. M., Aushev, T., Ayad, R., Babu, V., Badhrees, I., Bakich, A. M., Bansal, V., Behera, P., Beleño, C., Berger, M., Bhardwaj, V., Bhuyan, B., Bilka, T., Biswal, J., Bobrov, A., Bonvicini, G., Bozek, A., Bračko, M., Browder, T. E., Cao, L., Červenkov, D., Chang, P., Cheon, B. G., Chilikin, K., Cho, K., Choi, Y., Choudhury, S., Cinabro, D., Cunliffe, S., Di Carlo, S., Dingfelder, J., Dong, T. V., Eidelman, S., Epifanov, D., Fast, J. E., Ferber, T., Frey, A., Fulsom, B. G., Gaur, V., Gabyshev, N., Garmash, A., Gelb, M., Giri, A., Goldenzweig, P., Guan, Y., Guido, E., Haba, J., Hayasaka, K., Hayashii, H., Hou, W. -S., Iijima, T., Inami, K., Inguglia, G., Itoh, R., Iwasaki, M., Iwasaki, Y., Jacobs, W. W., Jaegle, I., Jeon, H. B., Jia, S., Jin, Y., Joo, K. K., Julius, T., Karyan, G., Kawasaki, T., Kiesling, C., Kim, D. Y., Kim, J. B., Kim, S. H., Kinoshita, K., Kodyš, P., Korpar, S., Kotchetkov, D., Križan, P., Kroeger, R., Krokovny, P., Kuhr, T., Kumar, R., Kuzmin, A., Kwon, Y. -J., Lee, I. S., Lee, S. C., Li, L. K., Li, Y. B., Li Gioi, L., Libby, J., Liventsev, D., Lubej, M., Luo, T., Masuda, M., Matsuda, T., Merola, M., Miyabayashi, K., Miyata, H., Mizuk, R., Mohanty, G. B., Mori, T., Nakao, M., Nanut, T., Nath, K. J., Niiyama, M., Nishida, S., Nishimura, K., Ogawa, K., Ogawa, S., Okuno, S., Ono, H., Ostrowicz, W., Pakhlov, P., Pakhlova, G., Pal, B., Park, H., Paul, S., Pedlar, T. K., Pestotnik, R., Piilonen, L. E., Prencipe, E., Ritter, M., Rostomyan, A., Russo, G., Sakai, Y., Sandilya, S., Santelj, L., Savinov, V., Schneider, O., Schnell, G., Schueler, J., Schwanda, C., Schwartz, A. J., Seino, Y., Senyo, K., Seon, O., Shebalin, V., Shibata, T. -A., Shiu, J. -G., Shwartz, B., Sokolov, A., Solovieva, E., Stanič, S., Starič, M., Sumiyoshi, T., Sutcliffe, W., Takizawa, M., Tanida, K., Taniguchi, N., Tenchini, F., Uchida, M., Uglov, T., Unno, Y., Uno, S., Vahsen, S. E., Van Hulse, C., Van Tonder, R., Varner, G., Varvell, K. E., Vossen, A., Wang, B., Wang, C. H., Wang, M. -Z., Wang, P., Watanabe, M., Widmann, E., Won, E., Ye, H., Yin, J. H., Yusa, Y., Zakharov, S., Zhang, Z. P., Zhilich, V., Zhukova, V., Zhulanov, V., Zupanc, A., and The Belle Collaboration. Wed . "Measurements of isospin asymmetry and difference of direct C P asymmetries in inclusive B → X s γ decays". United States. https://doi.org/10.1103/PhysRevD.99.032012.
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@article{osti_1495246,
title = {Measurements of isospin asymmetry and difference of direct C P asymmetries in inclusive B → X s γ decays},
author = {Watanuki, S. and Ishikawa, A. and Adachi, I. and Aihara, H. and Al Said, S. and Asner, D. M. and Aushev, T. and Ayad, R. and Babu, V. and Badhrees, I. and Bakich, A. M. and Bansal, V. and Behera, P. and Beleño, C. and Berger, M. and Bhardwaj, V. and Bhuyan, B. and Bilka, T. and Biswal, J. and Bobrov, A. and Bonvicini, G. and Bozek, A. and Bračko, M. and Browder, T. E. and Cao, L. and Červenkov, D. and Chang, P. and Cheon, B. G. and Chilikin, K. and Cho, K. and Choi, Y. and Choudhury, S. and Cinabro, D. and Cunliffe, S. and Di Carlo, S. and Dingfelder, J. and Dong, T. V. and Eidelman, S. and Epifanov, D. and Fast, J. E. and Ferber, T. and Frey, A. and Fulsom, B. G. and Gaur, V. and Gabyshev, N. and Garmash, A. and Gelb, M. and Giri, A. and Goldenzweig, P. and Guan, Y. and Guido, E. and Haba, J. and Hayasaka, K. and Hayashii, H. and Hou, W. -S. and Iijima, T. and Inami, K. and Inguglia, G. and Itoh, R. and Iwasaki, M. and Iwasaki, Y. and Jacobs, W. W. and Jaegle, I. and Jeon, H. B. and Jia, S. and Jin, Y. and Joo, K. K. and Julius, T. and Karyan, G. and Kawasaki, T. and Kiesling, C. and Kim, D. Y. and Kim, J. B. and Kim, S. H. and Kinoshita, K. and Kodyš, P. and Korpar, S. and Kotchetkov, D. and Križan, P. and Kroeger, R. and Krokovny, P. and Kuhr, T. and Kumar, R. and Kuzmin, A. and Kwon, Y. -J. and Lee, I. S. and Lee, S. C. and Li, L. K. and Li, Y. B. and Li Gioi, L. and Libby, J. and Liventsev, D. and Lubej, M. and Luo, T. and Masuda, M. and Matsuda, T. and Merola, M. and Miyabayashi, K. and Miyata, H. and Mizuk, R. and Mohanty, G. B. and Mori, T. and Nakao, M. and Nanut, T. and Nath, K. J. and Niiyama, M. and Nishida, S. and Nishimura, K. and Ogawa, K. and Ogawa, S. and Okuno, S. and Ono, H. and Ostrowicz, W. and Pakhlov, P. and Pakhlova, G. and Pal, B. and Park, H. and Paul, S. and Pedlar, T. K. and Pestotnik, R. and Piilonen, L. E. and Prencipe, E. and Ritter, M. and Rostomyan, A. and Russo, G. and Sakai, Y. and Sandilya, S. and Santelj, L. and Savinov, V. and Schneider, O. and Schnell, G. and Schueler, J. and Schwanda, C. and Schwartz, A. J. and Seino, Y. and Senyo, K. and Seon, O. and Shebalin, V. and Shibata, T. -A. and Shiu, J. -G. and Shwartz, B. and Sokolov, A. and Solovieva, E. and Stanič, S. and Starič, M. and Sumiyoshi, T. and Sutcliffe, W. and Takizawa, M. and Tanida, K. and Taniguchi, N. and Tenchini, F. and Uchida, M. and Uglov, T. and Unno, Y. and Uno, S. and Vahsen, S. E. and Van Hulse, C. and Van Tonder, R. and Varner, G. and Varvell, K. E. and Vossen, A. and Wang, B. and Wang, C. H. and Wang, M. -Z. and Wang, P. and Watanabe, M. and Widmann, E. and Won, E. and Ye, H. and Yin, J. H. and Yusa, Y. and Zakharov, S. and Zhang, Z. P. and Zhilich, V. and Zhukova, V. and Zhulanov, V. and Zupanc, A. and The Belle Collaboration},
abstractNote = {We report measurements of isospin asymmetry ${\mathrm{{\Delta}}}_{0{-}}$ and difference of direct $CP$ asymmetries $\mathrm{{\Delta}}{A}_{CP}$ between charged and neutral $B{\rightarrow}{X}_{s}{\gamma}$ decays. This analysis is based on the data sample containing $772\times{}{10}^{6}B\overline{B}$ pairs that was collected with the Belle detector at the KEKB energy-asymmetric ${e}^{+}{e}^{{-}}$ collider. Using a sum-of-exclusive technique with invariant ${X}_{s}$ mass up to $2.8\text{ }\text{ }\mathrm{GeV}/{c}^{2}$, we obtain ${\mathrm{{\Delta}}}_{0{-}}=[{-}0.48\pm{}1.49(\mathrm{stat})\pm{}0.97(\mathrm{syst})\pm{}1.15({f}_{+{-}}/{f}_{00})]$% and $\mathrm{{\Delta}}{A}_{CP}=[+3.69\pm{}2.65(\mathrm{stat})\pm{}0.76(\mathrm{syst})]$%, where the last uncertainty for ${\mathrm{{\Delta}}}_{0{-}}$ is due to the uncertainty on the production ratio of ${B}^{+}{B}^{{-}}$ to ${B}^{0}{\overline{B}}^{0}$ in $\mathrm{{\Upsilon}}(4S)$ decays. The measured value of ${\mathrm{{\Delta}}}_{0{-}}$ is consistent with zero, allowing us to constrain the resolved photon contribution in the $B{\rightarrow}{X}_{s}{\gamma}$, and improve the branching fraction prediction. The result for $\mathrm{{\Delta}}{A}_{CP}$ is consistent with the prediction of the SM. We also measure the direct $CP$ asymmetries for charged and neutral $B{\rightarrow}{X}_{s}{\gamma}$ decays. All the measurements are the most precise to date.},
doi = {10.1103/PhysRevD.99.032012},
journal = {Physical Review. D.},
number = 3,
volume = 99,
place = {United States},
year = {Wed Feb 20 00:00:00 EST 2019},
month = {Wed Feb 20 00:00:00 EST 2019}
}
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  • Asatryan, H. H.; Asatrian, H. M.; Yeghiyan, G. K.
  • International Journal of Modern Physics A, Vol. 16, Issue 23
  • DOI: 10.1142/S0217751X01005079

Exclusive measurements of b → s γ transition rate and photon energy spectrum
journal, September 2012

Evidence for Isospin Violation and Measurement of C P Asymmetries in B → K * ( 892 ) γ
journal, November 2017

Belle PID
journal, November 2002

  • Nakano, E.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 494, Issue 1-3
  • DOI: 10.1016/S0168-9002(02)01510-3

Evidence for B 0 → π 0 π 0
journal, December 2003

Measurements of the B → X s γ branching fraction and photon spectrum from a sum of exclusive final states
journal, September 2005

Search for hadronic b→u decays
journal, May 1990

B → V γ beyond QCD factorization
journal, March 2007

Studies of B 0 − B 0 mixing properties with inclusive dilepton events
journal, March 2003

Overview of the KEKB accelerators
journal, February 2003

  • Kurokawa, S.; Kikutani, E.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 499, Issue 1
  • DOI: 10.1016/S0168-9002(02)01771-0

Search for CP Violation in the Decay ${D^{+}}\to K_S^0{K^{+}}$
journal, February 2013

ΔF = 2 observables and B → X q γ decays in the left-right model: Higgs particles striking back
journal, March 2012

  • Blanke, Monika; Buras, Andrzej J.; Gemmler, Katrin
  • Journal of High Energy Physics, Vol. 2012, Issue 3
  • DOI: 10.1007/JHEP03(2012)024

Indirect probes of the MSSM after the Higgs discovery
journal, January 2013

  • Altmannshofer, Wolfgang; Carena, Marcela; Shah, Nausheen R.
  • Journal of High Energy Physics, Vol. 2013, Issue 1
  • DOI: 10.1007/JHEP01(2013)160

The Belle detector
journal, February 2002

  • Abashian, A.; Gotow, K.; Morgan, N.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 479, Issue 1
  • DOI: 10.1016/S0168-9002(01)02013-7
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