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Title: Measurement of branching fraction and first evidence of CP violation in B⁰→a₁±(1260)π decays

Abstract

We present a measurement of the branching fraction and time-dependent CP violation parameters in B⁰→a±₁(1260)π decays. The results are obtained from the final data sample containing 772×10⁶ BB¯¯¯ pairs collected at the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e⁺e⁻ collider. We obtain the product branching fraction B(B⁰→a±₁(1260)π)×B(a±₁(1260)→π±ππ±)=(11.1±1.0(stat)±1.4(syst))×10⁻⁶ and an upper limit on the product branching fraction for a possible decay with the same final state B(B⁰→a±₂(1320)π)×B(a±₂(1320)→π±ππ±)<2.2×10⁻⁶at 90% CL. In a time-dependent measurement to extract CP asymmetries, we obtain the CP violation parameters ACP=–0.06±0.05(stat)±0.07(syst), CCP=–0.01±0.11(stat)±0.09(syst), SCP=–0.51±0.14(stat)±0.08(syst), representing time- and flavor-integrated direct, flavor-dependent direct and mixing-induced CP violation, respectively. Simultaneously, we also extract the CP-conserving parameters ΔC=+0.54±0.11(stat)±0.07(syst), ΔS=–0.09±0.14(stat)±0.06(syst), which, respectively, describe a rate difference and strong phase difference between the decay channels where the a±₁ does not contain the spectator quark and those where it does. We find first evidence of mixing-induced CP violation in B⁰→a±₁(1260)π decays with 3.1σ significance. The rate where the a±₁ does not contain the spectator quark from the B meson is found to dominate the rate where it does at the 4.1σ level. However, there is no evidence for either time- and flavor-integrated direct CP violation or flavor-dependent direct CP violation.

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Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1101822
Resource Type:
Publisher's Accepted Manuscript
Journal Name:
Physical Review. D, Particles, Fields, Gravitation and Cosmology
Additional Journal Information:
Journal Name: Physical Review. D, Particles, Fields, Gravitation and Cosmology Journal Volume: 86 Journal Issue: 9; Journal ID: ISSN 1550-7998
Publisher:
American Physical Society
Country of Publication:
United States
Language:
English

Citation Formats

Dalseno, J., Adachi, I., Aihara, H., Asner, D. M., Aulchenko, V., Aushev, T., Bakich, A. M., Bay, A., Belous, K., Bhuyan, B., Bozek, A., Bračko, M., Brovchenko, O., Browder, T. E., Chekelian, V., Chen, A., Chen, P., Cheon, B. G., Chilikin, K., Chistov, R., Cho, I.-S., Cho, K., Choi, Y., Doležal, Z., Drásal, Z., Eidelman, S., Fast, J. E., Gaur, V., Gabyshev, N., Garmash, A., Goh, Y. M., Hayashii, H., Horii, Y., Hoshi, Y., Hou, W.-S., Hsiung, Y. B., Hyun, H. J., Iijima, T., Inami, K., Ishikawa, A., Itoh, R., Iwabuchi, M., Iwasaki, Y., Iwashita, T., Julius, T., Kang, J. H., Kiesling, C., Kim, H. O., Kim, J. B., Kim, Y. J., Kinoshita, K., Ko, B. R., Koblitz, S., Kodyš, P., Korpar, S., Križan, P., Krokovny, P., Kronenbitter, B., Kuhr, T., Kumita, T., Kwon, Y.-J., Lee, S.-H., Li, J., Libby, J., Liu, C., Liu, Z. Q., Louvot, R., MacNaughton, J., Matvienko, D., McOnie, S., Miyabayashi, K., Miyata, H., Miyazaki, Y., Mohanty, G. B., Mohapatra, D., Moll, A., Muramatsu, N., Nakao, M., Natkaniec, Z., Nedelkovska, E., Ng, C., Nishida, S., Nishimura, K., Nitoh, O., Ogawa, S., Ohshima, T., Okuno, S., Pakhlov, P., Pakhlova, G., Park, C. W., Park, H. K., Pedlar, T. K., Pestotnik, R., Petrič, M., Piilonen, L. E., Prim, M., Prothmann, K., Ritter, M., Röhrken, M., Sahoo, H., Sakai, Y., Sanuki, T., Schneider, O., Schwanda, C., Schwartz, A. J., Senyo, K., Seon, O., Sevior, M. E., Shapkin, M., Shebalin, V., Shen, C. P., Shibata, T.-A., Shiu, J.-G., Sibidanov, A., Simon, F., Smerkol, P., Sohn, Y.-S., Solovieva, E., Starič, M., Sumihama, M., Sumiyoshi, T., Tatishvili, G., Teramoto, Y., Trabelsi, K., Uchida, M., Uehara, S., Unno, Y., Uno, S., Urquijo, P., Usov, Y., Vanhoefer, P., Varner, G., Wang, C. H., Wang, P., Watanabe, M., Watanabe, Y., Williams, K. M., Won, E., Yabsley, B. D., Yamashita, Y., Zhang, Z. P., Zhilich, V., Zhulanov, V., and Zupanc, A. Measurement of branching fraction and first evidence of CP violation in B⁰→a₁±(1260)π∓ decays. United States: N. p., 2012. Web. doi:10.1103/PhysRevD.86.092012.
Dalseno, J., Adachi, I., Aihara, H., Asner, D. M., Aulchenko, V., Aushev, T., Bakich, A. M., Bay, A., Belous, K., Bhuyan, B., Bozek, A., Bračko, M., Brovchenko, O., Browder, T. E., Chekelian, V., Chen, A., Chen, P., Cheon, B. G., Chilikin, K., Chistov, R., Cho, I.-S., Cho, K., Choi, Y., Doležal, Z., Drásal, Z., Eidelman, S., Fast, J. E., Gaur, V., Gabyshev, N., Garmash, A., Goh, Y. M., Hayashii, H., Horii, Y., Hoshi, Y., Hou, W.-S., Hsiung, Y. B., Hyun, H. J., Iijima, T., Inami, K., Ishikawa, A., Itoh, R., Iwabuchi, M., Iwasaki, Y., Iwashita, T., Julius, T., Kang, J. H., Kiesling, C., Kim, H. O., Kim, J. B., Kim, Y. J., Kinoshita, K., Ko, B. R., Koblitz, S., Kodyš, P., Korpar, S., Križan, P., Krokovny, P., Kronenbitter, B., Kuhr, T., Kumita, T., Kwon, Y.-J., Lee, S.-H., Li, J., Libby, J., Liu, C., Liu, Z. Q., Louvot, R., MacNaughton, J., Matvienko, D., McOnie, S., Miyabayashi, K., Miyata, H., Miyazaki, Y., Mohanty, G. B., Mohapatra, D., Moll, A., Muramatsu, N., Nakao, M., Natkaniec, Z., Nedelkovska, E., Ng, C., Nishida, S., Nishimura, K., Nitoh, O., Ogawa, S., Ohshima, T., Okuno, S., Pakhlov, P., Pakhlova, G., Park, C. W., Park, H. K., Pedlar, T. K., Pestotnik, R., Petrič, M., Piilonen, L. E., Prim, M., Prothmann, K., Ritter, M., Röhrken, M., Sahoo, H., Sakai, Y., Sanuki, T., Schneider, O., Schwanda, C., Schwartz, A. J., Senyo, K., Seon, O., Sevior, M. E., Shapkin, M., Shebalin, V., Shen, C. P., Shibata, T.-A., Shiu, J.-G., Sibidanov, A., Simon, F., Smerkol, P., Sohn, Y.-S., Solovieva, E., Starič, M., Sumihama, M., Sumiyoshi, T., Tatishvili, G., Teramoto, Y., Trabelsi, K., Uchida, M., Uehara, S., Unno, Y., Uno, S., Urquijo, P., Usov, Y., Vanhoefer, P., Varner, G., Wang, C. H., Wang, P., Watanabe, M., Watanabe, Y., Williams, K. M., Won, E., Yabsley, B. D., Yamashita, Y., Zhang, Z. P., Zhilich, V., Zhulanov, V., & Zupanc, A. Measurement of branching fraction and first evidence of CP violation in B⁰→a₁±(1260)π∓ decays. United States. doi:10.1103/PhysRevD.86.092012.
Dalseno, J., Adachi, I., Aihara, H., Asner, D. M., Aulchenko, V., Aushev, T., Bakich, A. M., Bay, A., Belous, K., Bhuyan, B., Bozek, A., Bračko, M., Brovchenko, O., Browder, T. E., Chekelian, V., Chen, A., Chen, P., Cheon, B. G., Chilikin, K., Chistov, R., Cho, I.-S., Cho, K., Choi, Y., Doležal, Z., Drásal, Z., Eidelman, S., Fast, J. E., Gaur, V., Gabyshev, N., Garmash, A., Goh, Y. M., Hayashii, H., Horii, Y., Hoshi, Y., Hou, W.-S., Hsiung, Y. B., Hyun, H. J., Iijima, T., Inami, K., Ishikawa, A., Itoh, R., Iwabuchi, M., Iwasaki, Y., Iwashita, T., Julius, T., Kang, J. H., Kiesling, C., Kim, H. O., Kim, J. B., Kim, Y. J., Kinoshita, K., Ko, B. R., Koblitz, S., Kodyš, P., Korpar, S., Križan, P., Krokovny, P., Kronenbitter, B., Kuhr, T., Kumita, T., Kwon, Y.-J., Lee, S.-H., Li, J., Libby, J., Liu, C., Liu, Z. Q., Louvot, R., MacNaughton, J., Matvienko, D., McOnie, S., Miyabayashi, K., Miyata, H., Miyazaki, Y., Mohanty, G. B., Mohapatra, D., Moll, A., Muramatsu, N., Nakao, M., Natkaniec, Z., Nedelkovska, E., Ng, C., Nishida, S., Nishimura, K., Nitoh, O., Ogawa, S., Ohshima, T., Okuno, S., Pakhlov, P., Pakhlova, G., Park, C. W., Park, H. K., Pedlar, T. K., Pestotnik, R., Petrič, M., Piilonen, L. E., Prim, M., Prothmann, K., Ritter, M., Röhrken, M., Sahoo, H., Sakai, Y., Sanuki, T., Schneider, O., Schwanda, C., Schwartz, A. J., Senyo, K., Seon, O., Sevior, M. E., Shapkin, M., Shebalin, V., Shen, C. P., Shibata, T.-A., Shiu, J.-G., Sibidanov, A., Simon, F., Smerkol, P., Sohn, Y.-S., Solovieva, E., Starič, M., Sumihama, M., Sumiyoshi, T., Tatishvili, G., Teramoto, Y., Trabelsi, K., Uchida, M., Uehara, S., Unno, Y., Uno, S., Urquijo, P., Usov, Y., Vanhoefer, P., Varner, G., Wang, C. H., Wang, P., Watanabe, M., Watanabe, Y., Williams, K. M., Won, E., Yabsley, B. D., Yamashita, Y., Zhang, Z. P., Zhilich, V., Zhulanov, V., and Zupanc, A. Mon . "Measurement of branching fraction and first evidence of CP violation in B⁰→a₁±(1260)π∓ decays". United States. doi:10.1103/PhysRevD.86.092012.
@article{osti_1101822,
title = {Measurement of branching fraction and first evidence of CP violation in B⁰→a₁±(1260)π∓ decays},
author = {Dalseno, J. and Adachi, I. and Aihara, H. and Asner, D. M. and Aulchenko, V. and Aushev, T. and Bakich, A. M. and Bay, A. and Belous, K. and Bhuyan, B. and Bozek, A. and Bračko, M. and Brovchenko, O. and Browder, T. E. and Chekelian, V. and Chen, A. and Chen, P. and Cheon, B. G. and Chilikin, K. and Chistov, R. and Cho, I.-S. and Cho, K. and Choi, Y. and Doležal, Z. and Drásal, Z. and Eidelman, S. and Fast, J. E. and Gaur, V. and Gabyshev, N. and Garmash, A. and Goh, Y. M. and Hayashii, H. and Horii, Y. and Hoshi, Y. and Hou, W.-S. and Hsiung, Y. B. and Hyun, H. J. and Iijima, T. and Inami, K. and Ishikawa, A. and Itoh, R. and Iwabuchi, M. and Iwasaki, Y. and Iwashita, T. and Julius, T. and Kang, J. H. and Kiesling, C. and Kim, H. O. and Kim, J. B. and Kim, Y. J. and Kinoshita, K. and Ko, B. R. and Koblitz, S. and Kodyš, P. and Korpar, S. and Križan, P. and Krokovny, P. and Kronenbitter, B. and Kuhr, T. and Kumita, T. and Kwon, Y.-J. and Lee, S.-H. and Li, J. and Libby, J. and Liu, C. and Liu, Z. Q. and Louvot, R. and MacNaughton, J. and Matvienko, D. and McOnie, S. and Miyabayashi, K. and Miyata, H. and Miyazaki, Y. and Mohanty, G. B. and Mohapatra, D. and Moll, A. and Muramatsu, N. and Nakao, M. and Natkaniec, Z. and Nedelkovska, E. and Ng, C. and Nishida, S. and Nishimura, K. and Nitoh, O. and Ogawa, S. and Ohshima, T. and Okuno, S. and Pakhlov, P. and Pakhlova, G. and Park, C. W. and Park, H. K. and Pedlar, T. K. and Pestotnik, R. and Petrič, M. and Piilonen, L. E. and Prim, M. and Prothmann, K. and Ritter, M. and Röhrken, M. and Sahoo, H. and Sakai, Y. and Sanuki, T. and Schneider, O. and Schwanda, C. and Schwartz, A. J. and Senyo, K. and Seon, O. and Sevior, M. E. and Shapkin, M. and Shebalin, V. and Shen, C. P. and Shibata, T.-A. and Shiu, J.-G. and Sibidanov, A. and Simon, F. and Smerkol, P. and Sohn, Y.-S. and Solovieva, E. and Starič, M. and Sumihama, M. and Sumiyoshi, T. and Tatishvili, G. and Teramoto, Y. and Trabelsi, K. and Uchida, M. and Uehara, S. and Unno, Y. and Uno, S. and Urquijo, P. and Usov, Y. and Vanhoefer, P. and Varner, G. and Wang, C. H. and Wang, P. and Watanabe, M. and Watanabe, Y. and Williams, K. M. and Won, E. and Yabsley, B. D. and Yamashita, Y. and Zhang, Z. P. and Zhilich, V. and Zhulanov, V. and Zupanc, A.},
abstractNote = {We present a measurement of the branching fraction and time-dependent CP violation parameters in B⁰→a±₁(1260)π∓ decays. The results are obtained from the final data sample containing 772×10⁶ BB¯¯¯ pairs collected at the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e⁺e⁻ collider. We obtain the product branching fraction B(B⁰→a±₁(1260)π∓)×B(a±₁(1260)→π±π∓π±)=(11.1±1.0(stat)±1.4(syst))×10⁻⁶ and an upper limit on the product branching fraction for a possible decay with the same final state B(B⁰→a±₂(1320)π∓)×B(a±₂(1320)→π±π∓π±)<2.2×10⁻⁶at 90% CL. In a time-dependent measurement to extract CP asymmetries, we obtain the CP violation parameters ACP=–0.06±0.05(stat)±0.07(syst), CCP=–0.01±0.11(stat)±0.09(syst), SCP=–0.51±0.14(stat)±0.08(syst), representing time- and flavor-integrated direct, flavor-dependent direct and mixing-induced CP violation, respectively. Simultaneously, we also extract the CP-conserving parameters ΔC=+0.54±0.11(stat)±0.07(syst), ΔS=–0.09±0.14(stat)±0.06(syst), which, respectively, describe a rate difference and strong phase difference between the decay channels where the a±₁ does not contain the spectator quark and those where it does. We find first evidence of mixing-induced CP violation in B⁰→a±₁(1260)π∓ decays with 3.1σ significance. The rate where the a±₁ does not contain the spectator quark from the B meson is found to dominate the rate where it does at the 4.1σ level. However, there is no evidence for either time- and flavor-integrated direct CP violation or flavor-dependent direct CP violation.},
doi = {10.1103/PhysRevD.86.092012},
journal = {Physical Review. D, Particles, Fields, Gravitation and Cosmology},
number = 9,
volume = 86,
place = {United States},
year = {2012},
month = {11}
}

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DOI: 10.1103/PhysRevD.86.092012

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Works referenced in this record:

Measurement of C P -violating asymmetries in B 0 ( ρ π ) 0 using a time-dependent Dalitz plot analysis
journal, July 2007


CP violation and the CKM matrix: assessing the impact of the asymmetric B factories
journal, May 2005


Unitary Symmetry and Leptonic Decays
journal, June 1963


Nonleptonic two-body B decays including axial-vector mesons in the final state
journal, November 2007


Review of Particle Physics
journal, July 2010


Precise Measurement of the C P Violation Parameter sin  2 ϕ 1 in B 0 ( c c ¯ ) K 0 Decays
journal, April 2012


The use of Multiple Measurements in Taxonomic Problems
journal, September 1936


Isospin analysis of CP asymmetries in B decays
journal, December 1990


Measurement of time-dependent C P asymmetry in B 0 c c ¯ K ( * ) 0 decays
journal, April 2009


Weak phase α from B 0 a 1 ± ( 1260 ) π
journal, March 2006


Nonleptonic B decays to axial-vector mesons and factorization
journal, September 2006


Status of the Belle silicon vertex detector
journal, May 2006

  • Natkaniec, Z.; Aihara, H.; Asano, Y.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 560, Issue 1
  • DOI: 10.1016/j.nima.2005.11.228

Measurements of C P -Violating Asymmetries in B 0 a 1 ± ( 1260 ) π Decays
journal, May 2007


C P -Violation in the Renormalizable Theory of Weak Interaction
journal, February 1973

  • Kobayashi, Makoto; Maskawa, Toshihide
  • Progress of Theoretical Physics, Vol. 49, Issue 2
  • DOI: 10.1143/PTP.49.652

Hadronic charmless B decays B A P
journal, December 2007


Observation of B 0 Meson Decay to a 1 ± ( 1260 ) π
journal, August 2006


Proper-time resolution function for measurement of time evolution of B mesons at the KEK B-Factory
journal, November 2004

  • Tajima, H.; Aihara, H.; Higuchi, T.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 533, Issue 3
  • DOI: 10.1016/j.nima.2004.07.199

Neutral <mml:math altimg="si203.gif" overflow="scroll" xmlns:xocs="http://www.elsevier.com/xml/xocs/dtd" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.elsevier.com/xml/ja/dtd" xmlns:ja="http://www.elsevier.com/xml/ja/dtd" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:tb="http://www.elsevier.com/xml/common/table/dtd" xmlns:sb="http://www.elsevier.com/xml/common/struct-bib/dtd" xmlns:ce="http://www.elsevier.com/xml/common/dtd" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:cals="http://www.elsevier.com/xml/common/cals/dtd"><mml:mi>B</mml:mi></mml:math> flavor tagging for the measurement of mixing-induced <mml:math altimg="si204.gif" overflow="scroll" xmlns:xocs="http://www.elsevier.com/xml/xocs/dtd" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.elsevier.com/xml/ja/dtd" xmlns:ja="http://www.elsevier.com/xml/ja/dtd" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:tb="http://www.elsevier.com/xml/common/table/dtd" xmlns:sb="http://www.elsevier.com/xml/common/struct-bib/dtd" xmlns:ce="http://www.elsevier.com/xml/common/dtd" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:cals="http://www.elsevier.com/xml/common/cals/dtd"><mml:mi mathvariant="italic">CP</mml:mi></mml:math> violation at Belle
journal, November 2004

  • Kakuno, H.; Hara, K.; Casey, B. C. K.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 533, Issue 3
  • DOI: 10.1016/j.nima.2004.06.159

Improved measurement of C P -violating parameters in B ρ + ρ decays
journal, July 2007


Study of B 0 ρ + ρ decays and constraints on the CKM angle α
journal, September 2007


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

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

Impact of tag-side interference on time-dependent CP asymmetry measurements using coherent B 0 B 0 pairs
journal, August 2003


A study of the centrally produced ?+???0 system formed in the reactionpp?p f (?+???0)p s at 300 GeV/c
journal, June 1990

  • Armstrong, T. A.; Benayoun, M.; Beusch, W.
  • Zeitschrift f�r Physik C Particles and Fields, Vol. 48, Issue 2
  • DOI: 10.1007/BF01554468