skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Evidence for semileptonic B - p p ¯ - ν ¯ decays

Abstract

Evidence for the semileptonic baryonic decay B - p p ¯ - ν ¯ ( = e , μ ), based on a data sample of 772 million B B ¯ pairs collected at the Υ ( 4 S ) resonance with the Belle detector at the KEKB asymmetric-energy electron-positron collider is collected. A neural-network based hadronic B -meson tagging method is used in this study. The branching fraction of B - p p ¯ - ν ¯ is measured to be ( 5. 8 - 2.1 + 2.4 (stat) ± 0.9 (syst) ) × 10 - 6 with a significance of 3.2 σ , where lepton universality is assumed. We also estimate the corresponding upper limit: B ( B - p p ¯ - ν ¯ ) < 9.6 × 10 - 6 at the 90% confidence level. This measurement helps constrain the baryonic transition form factor in B decays.

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; more »; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; « less
Publication Date:
Research Org.:
Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Contributing Org.:
Belle Collaboration
OSTI Identifier:
1594497
Report Number(s):
PNNL-SA-99792
Journal ID: ISSN 1550-7998; PRVDAQ
Grant/Contract Number:  
SC0009973
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physical Review. D, Particles, Fields, Gravitation and Cosmology
Additional Journal Information:
Journal Volume: 89; Journal Issue: 1; Journal ID: ISSN 1550-7998
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Tien, K. -J., Wang, M. -Z., Adachi, I., Aihara, H., Asner, D. M., Aulchenko, V., Aushev, T., Bakich, A. M., Bala, A., Bhuyan, B., Bozek, A., Bračko, M., Browder, T. E., Chang, P., Chekelian, V., Chen, A., Chen, P., Cheon, B. G., Chilikin, K., Chistov, R., Cho, I. -S., Cho, K., Chobanova, V., Choi, Y., Cinabro, D., Dalseno, J., Danilov, M., Doležal, Z., Drásal, Z., Dutta, D., Eidelman, S., Farhat, H., Fast, J. E., Ferber, T., Gaur, V., Ganguly, S., Gillard, R., Goh, Y. M., Golob, B., Haba, J., Hayashii, H., Horii, Y., Hoshi, Y., Hou, W. -S., Hsiung, Y. B., Huschle, M., Hyun, H. J., Iijima, T., Ishikawa, A., Itoh, R., Iwasaki, Y., Julius, T., Kah, D. H., Kang, J. H., Kato, E., Kawasaki, T., Kichimi, H., Kiesling, C., Kim, D. Y., Kim, H. J., Kim, J. B., Kim, J. H., Kim, Y. J., Klucar, J., Ko, B. R., Kodyš, P., Korpar, S., Križan, P., Krokovny, P., Kronenbitter, B., Kuhr, T., Kumita, T., Kuzmin, A., Kwon, Y. -J., Lee, S. -H., Li, J., Li, Y., Libby, J., Liu, C., Liu, Y., Liventsev, D., Lukin, P., Miyabayashi, K., Miyata, H., Mohanty, G. B., Moll, A., Mussa, R., Nakano, E., Nakao, M., Natkaniec, Z., Nayak, M., Nedelkovska, E., Ng, C., Nisar, N. K., Nishida, S., Nitoh, O., Ogawa, S., Okuno, S., Olsen, S. L., Ostrowicz, W., Oswald, C., Park, C. W., Park, H., Park, H. K., Pedlar, T. K., Pestotnik, R., Petrič, M., Piilonen, L. E., Ritter, M., Röhrken, M., Rostomyan, A., Sahoo, H., Saito, T., Sakai, Y., Sandilya, S., Santel, D., Santelj, L., Sanuki, T., Sato, Y., Savinov, V., Schneider, O., Schnell, G., Schwanda, C., Semmler, D., Senyo, K., Seon, O., Sevior, M. E., Shapkin, M., Shen, C. P., Shibata, T. -A., Shiu, J. -G., Sibidanov, A., Sohn, Y. -S., Sokolov, A., Stanič, S., Starič, M., Steder, M., Sumihama, M., Sumiyoshi, T., Tanida, K., Tatishvili, G., Teramoto, Y., Uchida, M., Uehara, S., Uglov, T., Unno, Y., Uno, S., Urquijo, P., Vahsen, S. E., Van Hulse, C., Vanhoefer, P., Varner, G., Varvell, K. E., Vinokurova, A., Vorobyev, V., Wagner, M. N., Wang, C. H., Wang, P., Watanabe, M., Watanabe, Y., Williams, K. M., Won, E., Yamaoka, J., Yamashita, Y., Yashchenko, S., Zhang, Z. P., Zhilich, V., Zhulanov, V., and Zupanc, A. Evidence for semileptonic B-→pp¯ℓ-ν¯ℓ decays. United States: N. p., 2014. Web. doi:10.1103/PhysRevD.89.011101.
Tien, K. -J., Wang, M. -Z., Adachi, I., Aihara, H., Asner, D. M., Aulchenko, V., Aushev, T., Bakich, A. M., Bala, A., Bhuyan, B., Bozek, A., Bračko, M., Browder, T. E., Chang, P., Chekelian, V., Chen, A., Chen, P., Cheon, B. G., Chilikin, K., Chistov, R., Cho, I. -S., Cho, K., Chobanova, V., Choi, Y., Cinabro, D., Dalseno, J., Danilov, M., Doležal, Z., Drásal, Z., Dutta, D., Eidelman, S., Farhat, H., Fast, J. E., Ferber, T., Gaur, V., Ganguly, S., Gillard, R., Goh, Y. M., Golob, B., Haba, J., Hayashii, H., Horii, Y., Hoshi, Y., Hou, W. -S., Hsiung, Y. B., Huschle, M., Hyun, H. J., Iijima, T., Ishikawa, A., Itoh, R., Iwasaki, Y., Julius, T., Kah, D. H., Kang, J. H., Kato, E., Kawasaki, T., Kichimi, H., Kiesling, C., Kim, D. Y., Kim, H. J., Kim, J. B., Kim, J. H., Kim, Y. J., Klucar, J., Ko, B. R., Kodyš, P., Korpar, S., Križan, P., Krokovny, P., Kronenbitter, B., Kuhr, T., Kumita, T., Kuzmin, A., Kwon, Y. -J., Lee, S. -H., Li, J., Li, Y., Libby, J., Liu, C., Liu, Y., Liventsev, D., Lukin, P., Miyabayashi, K., Miyata, H., Mohanty, G. B., Moll, A., Mussa, R., Nakano, E., Nakao, M., Natkaniec, Z., Nayak, M., Nedelkovska, E., Ng, C., Nisar, N. K., Nishida, S., Nitoh, O., Ogawa, S., Okuno, S., Olsen, S. L., Ostrowicz, W., Oswald, C., Park, C. W., Park, H., Park, H. K., Pedlar, T. K., Pestotnik, R., Petrič, M., Piilonen, L. E., Ritter, M., Röhrken, M., Rostomyan, A., Sahoo, H., Saito, T., Sakai, Y., Sandilya, S., Santel, D., Santelj, L., Sanuki, T., Sato, Y., Savinov, V., Schneider, O., Schnell, G., Schwanda, C., Semmler, D., Senyo, K., Seon, O., Sevior, M. E., Shapkin, M., Shen, C. P., Shibata, T. -A., Shiu, J. -G., Sibidanov, A., Sohn, Y. -S., Sokolov, A., Stanič, S., Starič, M., Steder, M., Sumihama, M., Sumiyoshi, T., Tanida, K., Tatishvili, G., Teramoto, Y., Uchida, M., Uehara, S., Uglov, T., Unno, Y., Uno, S., Urquijo, P., Vahsen, S. E., Van Hulse, C., Vanhoefer, P., Varner, G., Varvell, K. E., Vinokurova, A., Vorobyev, V., Wagner, M. N., Wang, C. H., Wang, P., Watanabe, M., Watanabe, Y., Williams, K. M., Won, E., Yamaoka, J., Yamashita, Y., Yashchenko, S., Zhang, Z. P., Zhilich, V., Zhulanov, V., & Zupanc, A. Evidence for semileptonic B-→pp¯ℓ-ν¯ℓ decays. United States. doi:10.1103/PhysRevD.89.011101.
Tien, K. -J., Wang, M. -Z., Adachi, I., Aihara, H., Asner, D. M., Aulchenko, V., Aushev, T., Bakich, A. M., Bala, A., Bhuyan, B., Bozek, A., Bračko, M., Browder, T. E., Chang, P., Chekelian, V., Chen, A., Chen, P., Cheon, B. G., Chilikin, K., Chistov, R., Cho, I. -S., Cho, K., Chobanova, V., Choi, Y., Cinabro, D., Dalseno, J., Danilov, M., Doležal, Z., Drásal, Z., Dutta, D., Eidelman, S., Farhat, H., Fast, J. E., Ferber, T., Gaur, V., Ganguly, S., Gillard, R., Goh, Y. M., Golob, B., Haba, J., Hayashii, H., Horii, Y., Hoshi, Y., Hou, W. -S., Hsiung, Y. B., Huschle, M., Hyun, H. J., Iijima, T., Ishikawa, A., Itoh, R., Iwasaki, Y., Julius, T., Kah, D. H., Kang, J. H., Kato, E., Kawasaki, T., Kichimi, H., Kiesling, C., Kim, D. Y., Kim, H. J., Kim, J. B., Kim, J. H., Kim, Y. J., Klucar, J., Ko, B. R., Kodyš, P., Korpar, S., Križan, P., Krokovny, P., Kronenbitter, B., Kuhr, T., Kumita, T., Kuzmin, A., Kwon, Y. -J., Lee, S. -H., Li, J., Li, Y., Libby, J., Liu, C., Liu, Y., Liventsev, D., Lukin, P., Miyabayashi, K., Miyata, H., Mohanty, G. B., Moll, A., Mussa, R., Nakano, E., Nakao, M., Natkaniec, Z., Nayak, M., Nedelkovska, E., Ng, C., Nisar, N. K., Nishida, S., Nitoh, O., Ogawa, S., Okuno, S., Olsen, S. L., Ostrowicz, W., Oswald, C., Park, C. W., Park, H., Park, H. K., Pedlar, T. K., Pestotnik, R., Petrič, M., Piilonen, L. E., Ritter, M., Röhrken, M., Rostomyan, A., Sahoo, H., Saito, T., Sakai, Y., Sandilya, S., Santel, D., Santelj, L., Sanuki, T., Sato, Y., Savinov, V., Schneider, O., Schnell, G., Schwanda, C., Semmler, D., Senyo, K., Seon, O., Sevior, M. E., Shapkin, M., Shen, C. P., Shibata, T. -A., Shiu, J. -G., Sibidanov, A., Sohn, Y. -S., Sokolov, A., Stanič, S., Starič, M., Steder, M., Sumihama, M., Sumiyoshi, T., Tanida, K., Tatishvili, G., Teramoto, Y., Uchida, M., Uehara, S., Uglov, T., Unno, Y., Uno, S., Urquijo, P., Vahsen, S. E., Van Hulse, C., Vanhoefer, P., Varner, G., Varvell, K. E., Vinokurova, A., Vorobyev, V., Wagner, M. N., Wang, C. H., Wang, P., Watanabe, M., Watanabe, Y., Williams, K. M., Won, E., Yamaoka, J., Yamashita, Y., Yashchenko, S., Zhang, Z. P., Zhilich, V., Zhulanov, V., and Zupanc, A. Thu . "Evidence for semileptonic B-→pp¯ℓ-ν¯ℓ decays". United States. doi:10.1103/PhysRevD.89.011101. https://www.osti.gov/servlets/purl/1594497.
@article{osti_1594497,
title = {Evidence for semileptonic B-→pp¯ℓ-ν¯ℓ decays},
author = {Tien, K. -J. and Wang, M. -Z. and Adachi, I. and Aihara, H. and Asner, D. M. and Aulchenko, V. and Aushev, T. and Bakich, A. M. and Bala, A. and Bhuyan, B. and Bozek, A. and Bračko, M. and Browder, T. E. and Chang, P. 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 Chobanova, V. and Choi, Y. and Cinabro, D. and Dalseno, J. and Danilov, M. and Doležal, Z. and Drásal, Z. and Dutta, D. and Eidelman, S. and Farhat, H. and Fast, J. E. and Ferber, T. and Gaur, V. and Ganguly, S. and Gillard, R. and Goh, Y. M. and Golob, B. and Haba, J. and Hayashii, H. and Horii, Y. and Hoshi, Y. and Hou, W. -S. and Hsiung, Y. B. and Huschle, M. and Hyun, H. J. and Iijima, T. and Ishikawa, A. and Itoh, R. and Iwasaki, Y. and Julius, T. and Kah, D. H. and Kang, J. H. and Kato, E. and Kawasaki, T. and Kichimi, H. and Kiesling, C. and Kim, D. Y. and Kim, H. J. and Kim, J. B. and Kim, J. H. and Kim, Y. J. and Klucar, J. and Ko, B. R. and Kodyš, P. and Korpar, S. and Križan, P. and Krokovny, P. and Kronenbitter, B. and Kuhr, T. and Kumita, T. and Kuzmin, A. and Kwon, Y. -J. and Lee, S. -H. and Li, J. and Li, Y. and Libby, J. and Liu, C. and Liu, Y. and Liventsev, D. and Lukin, P. and Miyabayashi, K. and Miyata, H. and Mohanty, G. B. and Moll, A. and Mussa, R. and Nakano, E. and Nakao, M. and Natkaniec, Z. and Nayak, M. and Nedelkovska, E. and Ng, C. and Nisar, N. K. and Nishida, S. and Nitoh, O. and Ogawa, S. and Okuno, S. and Olsen, S. L. and Ostrowicz, W. and Oswald, C. and Park, C. W. and Park, H. and Park, H. K. and Pedlar, T. K. and Pestotnik, R. and Petrič, M. and Piilonen, L. E. and Ritter, M. and Röhrken, M. and Rostomyan, A. and Sahoo, H. and Saito, T. and Sakai, Y. and Sandilya, S. and Santel, D. and Santelj, L. and Sanuki, T. and Sato, Y. and Savinov, V. and Schneider, O. and Schnell, G. and Schwanda, C. and Semmler, D. and Senyo, K. and Seon, O. and Sevior, M. E. and Shapkin, M. and Shen, C. P. and Shibata, T. -A. and Shiu, J. -G. and Sibidanov, A. and Sohn, Y. -S. and Sokolov, A. and Stanič, S. and Starič, M. and Steder, M. and Sumihama, M. and Sumiyoshi, T. and Tanida, K. and Tatishvili, G. and Teramoto, Y. and Uchida, M. and Uehara, S. and Uglov, T. and Unno, Y. and Uno, S. and Urquijo, P. and Vahsen, S. E. and Van Hulse, C. and Vanhoefer, P. and Varner, G. and Varvell, K. E. and Vinokurova, A. and Vorobyev, V. and Wagner, M. N. and Wang, C. H. and Wang, P. and Watanabe, M. and Watanabe, Y. and Williams, K. M. and Won, E. and Yamaoka, J. and Yamashita, Y. and Yashchenko, S. and Zhang, Z. P. and Zhilich, V. and Zhulanov, V. and Zupanc, A.},
abstractNote = {Evidence for the semileptonic baryonic decay B-→pp¯ℓ-ν¯ℓ (ℓ=e, μ), based on a data sample of 772 million BB¯ pairs collected at the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy electron-positron collider is collected. A neural-network based hadronic B-meson tagging method is used in this study. The branching fraction of B-→pp¯ℓ-ν¯ℓ is measured to be (5.8-2.1+2.4(stat)±0.9(syst))×10-6 with a significance of 3.2σ, where lepton universality is assumed. We also estimate the corresponding upper limit: B(B-→pp¯ℓ-ν¯ℓ)<9.6×10-6 at the 90% confidence level. This measurement helps constrain the baryonic transition form factor in B decays.},
doi = {10.1103/PhysRevD.89.011101},
journal = {Physical Review. D, Particles, Fields, Gravitation and Cosmology},
issn = {1550-7998},
number = 1,
volume = 89,
place = {United States},
year = {2014},
month = {1}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Citation Metrics:
Cited by: 5 works
Citation information provided by
Web of Science

Save / Share:

Works referenced in this record:

Measurement of | V u b | from Inclusive Charmless Semileptonic B Decays
journal, January 2010


Search for B → p ¯ e − ν ¯ e X decay using a partial reconstruction method
journal, July 2003


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

Search for B ¯ → Λ c + X ℓ − ν ¯ ℓ decays in events with a fully reconstructed B meson
journal, January 2012


Semileptonic Bpp¯ν¯ decays
journal, October 2011


Study of the decay mechanism for <mml:math altimg="si1.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:msup><mml:mi>B</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:mo>→</mml:mo><mml:mi>p</mml:mi><mml:mover accent="true"><mml:mi>p</mml:mi><mml:mo>¯</mml:mo></mml:mover><mml:msup><mml:mi>K</mml:mi><mml:mo>+</mml:mo></mml:msup></mml:math> and <mml:math altimg="si2.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:msup><mml:mi>B</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:mo>→</mml:mo><mml:mi>p</mml:mi><mml:mover accent="true"><mml:mi>p</mml:mi><mml:mo>¯</mml:mo></mml:mover><mml:msup><mml:mi>π</mml:mi><mml:mo>+</mml:mo></mml:msup></mml:math>
journal, January 2008


Observation of B ¯ 0 D ( * ) 0 p p ¯
journal, September 2002


Measurement of the decay B 0 π + ν and determination of | V u b |
journal, April 2011


Review of Particle Physics
journal, July 2012


The EvtGen particle decay simulation package
journal, April 2001

  • Lange, David J.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 462, Issue 1-2
  • DOI: 10.1016/S0168-9002(01)00089-4

Study of B π l ν and B ρ l ν decays and determination of | V u b |
journal, February 2011


Pathways to Rare Baryonic B Decays
journal, May 2001


Measurement of the B + p p ¯ K + branching fraction and study of the decay dynamics
journal, September 2005


Observables for the Analysis of Event Shapes in e + e Annihilation and Other Processes
journal, December 1978


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

A hierarchical NeuroBayes-based algorithm for full reconstruction of B mesons at B factories
journal, October 2011

  • Feindt, M.; Keller, F.; Kreps, M.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 654, Issue 1
  • DOI: 10.1016/j.nima.2011.06.008

Observation of B + p p ¯ π + , B 0 p p ¯ K 0 , and B + p p ¯ K * +
journal, April 2004


Observation of B 0 p p ¯ K * 0 with a Large K * 0 Polarization
journal, June 2008


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

Study of the baryon–antibaryon low-mass enhancements in charmless three-body baryonic B decays
journal, June 2005