Observation of B+→pΛ̄γ

Y. J. Lee, M. Z. Wang, K. Abe, K. Abe, H. Aihara, Y. Asano, V. Aulchenko, T. Aushev, S. Bahinipati, A. M. Bakich, I. Bedny, U. Bitenc, I. Bizjak, A. Bondar, A. Bozek, M. Bračko, J. Brodzicka, T. E. Browder, M. C. Chang, P. Chang & 144 others Y. Chao, A. Chen, K. F. Chen, W. T. Chen, B. G. Cheon, R. Chistov, S. K. Choi, A. Chuvikov, S. Cole, J. Dalseno, M. Danilov, M. Dash, A. Drutskoy, S. Eidelman, Y. Enari, F. Fang, S. Fratina, N. Gabyshev, A. Garmash, T. Gershon, G. Gokhroo, B. Golob, A. Gorišek, J. Haba, K. Hayasaka, M. Hazumi, L. Hinz, T. Hokuue, Y. Hoshi, S. Hou, W. S. Hou, Y. B. Hsiung, T. Iijima, A. Imoto, K. Inami, A. Ishikawa, R. Itoh, M. Iwasaki, Y. Iwasaki, Ju Hwan Kang, J. S. Kang, P. Kapusta, N. Katayama, H. Kawai, T. Kawasaki, H. R. Khan, H. Kichimi, H. J. Kim, S. K. Kim, S. M. Kim, K. Kinoshita, S. Korpar, P. Križan, P. Krokovny, S. Kumar, C. C. Kuo, A. Kuzmin, Youngjoon Kwon, G. Leder, S. E. Lee, T. Lesiak, J. Li, S. W. Lin, D. Liventsev, F. Mandl, T. Matsumoto, A. Matyja, W. Mitaroff, H. Miyake, H. Miyata, R. Mizuk, G. R. Moloney, T. Nagamine, Y. Nagasaka, E. Nakano, M. Nakao, H. Nakazawa, Z. Natkaniec, S. Nishida, O. Nitoh, S. Ogawa, T. Ohshima, T. Okabe, S. L. Olsen, W. Ostrowicz, H. Ozaki, H. Palka, C. W. Park, N. Parslow, L. S. Peak, R. Pestotnik, L. E. Piilonen, N. Root, M. Rozanska, H. Sagawa, Y. Sakai, N. Sato, T. Schietinger, O. Schneider, J. Schümann, K. Senyo, M. E. Sevior, T. Shibata, H. Shibuya, B. Shwartz, V. Sidorov, J. B. Singh, A. Somov, R. Stamen, S. Stanič, M. Starič, K. Sumisawa, T. Sumiyoshi, O. Tajima, F. Takasaki, K. Tamai, N. Tamura, M. Tanaka, Y. Teramoto, X. C. Tian, T. Tsukamoto, S. Uehara, T. Uglov, K. Ueno, S. Uno, P. Urquijo, G. Varner, K. E. Varvell, S. Villa, C. C. Wang, C. H. Wang, M. Watanabe, Q. L. Xie, A. Yamaguchi, Y. Yamashita, M. Yamauchi, Heyoung Yang, J. Ying, C. C. Zhang, L. M. Zhang, Z. P. Zhang, V. Zhilich, D. Žontar, D. Zürcher

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

We report the first observation of the radiative hyperonic B decay B+→pΛ̄γ, using a 140fb-1 data sample recorded on the Υ(4S) resonance with the Belle detector at the KEKB asymmetric energy e+e- collider. The measured branching fraction is B(B+→pΛ̄γ)= (2.16-0.53+0.58±0.20)×10-6. We examine its MpΛ̄ distribution and observe a peak near threshold. This feature is expected by the short-distance b→sγ transition. A search for B+→pΣ̄ 0γ yields no significant signal, and we set a 90% confidence-level upper limit on the branching fraction of B(B+→pΣ̄0γ)<4. 6×10-6.

Original languageEnglish
Article number061802
JournalPhysical Review Letters
Volume95
Issue number6
DOIs
Publication statusPublished - 2005 Aug 5

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thresholds
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All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

Lee, Y. J., Wang, M. Z., Abe, K., Abe, K., Aihara, H., Asano, Y., ... Zürcher, D. (2005). Observation of B+→pΛ̄γ. Physical Review Letters, 95(6), [061802]. https://doi.org/10.1103/PhysRevLett.95.061802
Lee, Y. J. ; Wang, M. Z. ; Abe, K. ; Abe, K. ; Aihara, H. ; Asano, Y. ; Aulchenko, V. ; Aushev, T. ; Bahinipati, S. ; Bakich, A. M. ; Bedny, I. ; Bitenc, U. ; Bizjak, I. ; Bondar, A. ; Bozek, A. ; Bračko, M. ; Brodzicka, J. ; Browder, T. E. ; Chang, M. C. ; Chang, P. ; Chao, Y. ; Chen, A. ; Chen, K. F. ; Chen, W. T. ; Cheon, B. G. ; Chistov, R. ; Choi, S. K. ; Chuvikov, A. ; Cole, S. ; Dalseno, J. ; Danilov, M. ; Dash, M. ; Drutskoy, A. ; Eidelman, S. ; Enari, Y. ; Fang, F. ; Fratina, S. ; Gabyshev, N. ; Garmash, A. ; Gershon, T. ; Gokhroo, G. ; Golob, B. ; Gorišek, A. ; Haba, J. ; Hayasaka, K. ; Hazumi, M. ; Hinz, L. ; Hokuue, T. ; Hoshi, Y. ; Hou, S. ; Hou, W. S. ; Hsiung, Y. B. ; Iijima, T. ; Imoto, A. ; Inami, K. ; Ishikawa, A. ; Itoh, R. ; Iwasaki, M. ; Iwasaki, Y. ; Kang, Ju Hwan ; Kang, J. S. ; Kapusta, P. ; Katayama, N. ; Kawai, H. ; Kawasaki, T. ; Khan, H. R. ; Kichimi, H. ; Kim, H. J. ; Kim, S. K. ; Kim, S. M. ; Kinoshita, K. ; Korpar, S. ; Križan, P. ; Krokovny, P. ; Kumar, S. ; Kuo, C. C. ; Kuzmin, A. ; Kwon, Youngjoon ; Leder, G. ; Lee, S. E. ; Lesiak, T. ; Li, J. ; Lin, S. W. ; Liventsev, D. ; Mandl, F. ; Matsumoto, T. ; Matyja, A. ; Mitaroff, W. ; Miyake, H. ; Miyata, H. ; Mizuk, R. ; Moloney, G. R. ; Nagamine, T. ; Nagasaka, Y. ; Nakano, E. ; Nakao, M. ; Nakazawa, H. ; Natkaniec, Z. ; Nishida, S. ; Nitoh, O. ; Ogawa, S. ; Ohshima, T. ; Okabe, T. ; Olsen, S. L. ; Ostrowicz, W. ; Ozaki, H. ; Palka, H. ; Park, C. W. ; Parslow, N. ; Peak, L. S. ; Pestotnik, R. ; Piilonen, L. E. ; Root, N. ; Rozanska, M. ; Sagawa, H. ; Sakai, Y. ; Sato, N. ; Schietinger, T. ; Schneider, O. ; Schümann, J. ; Senyo, K. ; Sevior, M. E. ; Shibata, T. ; Shibuya, H. ; Shwartz, B. ; Sidorov, V. ; Singh, J. B. ; Somov, A. ; Stamen, R. ; Stanič, S. ; Starič, M. ; Sumisawa, K. ; Sumiyoshi, T. ; Tajima, O. ; Takasaki, F. ; Tamai, K. ; Tamura, N. ; Tanaka, M. ; Teramoto, Y. ; Tian, X. C. ; Tsukamoto, T. ; Uehara, S. ; Uglov, T. ; Ueno, K. ; Uno, S. ; Urquijo, P. ; Varner, G. ; Varvell, K. E. ; Villa, S. ; Wang, C. C. ; Wang, C. H. ; Watanabe, M. ; Xie, Q. L. ; Yamaguchi, A. ; Yamashita, Y. ; Yamauchi, M. ; Yang, Heyoung ; Ying, J. ; Zhang, C. C. ; Zhang, L. M. ; Zhang, Z. P. ; Zhilich, V. ; Žontar, D. ; Zürcher, D. / Observation of B+→pΛ̄γ. In: Physical Review Letters. 2005 ; Vol. 95, No. 6.
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title = "Observation of B+→pΛ̄γ",
abstract = "We report the first observation of the radiative hyperonic B decay B+→pΛ̄γ, using a 140fb-1 data sample recorded on the Υ(4S) resonance with the Belle detector at the KEKB asymmetric energy e+e- collider. The measured branching fraction is B(B+→pΛ̄γ)= (2.16-0.53+0.58±0.20)×10-6. We examine its MpΛ̄ distribution and observe a peak near threshold. This feature is expected by the short-distance b→sγ transition. A search for B+→pΣ̄ 0γ yields no significant signal, and we set a 90{\%} confidence-level upper limit on the branching fraction of B(B+→pΣ̄0γ)<4. 6×10-6.",
author = "Lee, {Y. J.} and Wang, {M. Z.} and K. Abe and K. Abe and H. Aihara and Y. Asano and V. Aulchenko and T. Aushev and S. Bahinipati and Bakich, {A. M.} and I. Bedny and U. Bitenc and I. Bizjak and A. Bondar and A. Bozek and M. Bračko and J. Brodzicka and Browder, {T. E.} and Chang, {M. C.} and P. Chang and Y. Chao and A. Chen and Chen, {K. F.} and Chen, {W. T.} and Cheon, {B. G.} and R. Chistov and Choi, {S. K.} and A. Chuvikov and S. Cole and J. Dalseno and M. Danilov and M. Dash and A. Drutskoy and S. Eidelman and Y. Enari and F. Fang and S. Fratina and N. Gabyshev and A. Garmash and T. Gershon and G. Gokhroo and B. Golob and A. Gorišek and J. Haba and K. Hayasaka and M. Hazumi and L. Hinz and T. Hokuue and Y. Hoshi and S. Hou and Hou, {W. S.} and Hsiung, {Y. B.} and T. Iijima and A. Imoto and K. Inami and A. Ishikawa and R. Itoh and M. Iwasaki and Y. Iwasaki and Kang, {Ju Hwan} and Kang, {J. S.} and P. Kapusta and N. Katayama and H. Kawai and T. Kawasaki and Khan, {H. R.} and H. Kichimi and Kim, {H. J.} and Kim, {S. K.} and Kim, {S. M.} and K. Kinoshita and S. Korpar and P. Križan and P. Krokovny and S. Kumar and Kuo, {C. C.} and A. Kuzmin and Youngjoon Kwon and G. Leder and Lee, {S. E.} and T. Lesiak and J. Li and Lin, {S. W.} and D. Liventsev and F. Mandl and T. Matsumoto and A. Matyja and W. Mitaroff and H. Miyake and H. Miyata and R. Mizuk and Moloney, {G. R.} and T. Nagamine and Y. Nagasaka and E. Nakano and M. Nakao and H. Nakazawa and Z. Natkaniec and S. Nishida and O. Nitoh and S. Ogawa and T. Ohshima and T. Okabe and Olsen, {S. L.} and W. Ostrowicz and H. Ozaki and H. Palka and Park, {C. W.} and N. Parslow and Peak, {L. S.} and R. Pestotnik and Piilonen, {L. E.} and N. Root and M. Rozanska and H. Sagawa and Y. Sakai and N. Sato and T. Schietinger and O. Schneider and J. Sch{\"u}mann and K. Senyo and Sevior, {M. E.} and T. Shibata and H. Shibuya and B. Shwartz and V. Sidorov and Singh, {J. B.} and A. Somov and R. Stamen and S. Stanič and M. Starič and K. Sumisawa and T. Sumiyoshi and O. Tajima and F. Takasaki and K. Tamai and N. Tamura and M. Tanaka and Y. Teramoto and Tian, {X. C.} and T. Tsukamoto and S. Uehara and T. Uglov and K. Ueno and S. Uno and P. Urquijo and G. Varner and Varvell, {K. E.} and S. Villa and Wang, {C. C.} and Wang, {C. H.} and M. Watanabe and Xie, {Q. L.} and A. Yamaguchi and Y. Yamashita and M. Yamauchi and Heyoung Yang and J. Ying and Zhang, {C. C.} and Zhang, {L. M.} and Zhang, {Z. P.} and V. Zhilich and D. Žontar and D. Z{\"u}rcher",
year = "2005",
month = "8",
day = "5",
doi = "10.1103/PhysRevLett.95.061802",
language = "English",
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journal = "Physical Review Letters",
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Lee, YJ, Wang, MZ, Abe, K, Abe, K, Aihara, H, Asano, Y, Aulchenko, V, Aushev, T, Bahinipati, S, Bakich, AM, Bedny, I, Bitenc, U, Bizjak, I, Bondar, A, Bozek, A, Bračko, M, Brodzicka, J, Browder, TE, Chang, MC, Chang, P, Chao, Y, Chen, A, Chen, KF, Chen, WT, Cheon, BG, Chistov, R, Choi, SK, Chuvikov, A, Cole, S, Dalseno, J, Danilov, M, Dash, M, Drutskoy, A, Eidelman, S, Enari, Y, Fang, F, Fratina, S, Gabyshev, N, Garmash, A, Gershon, T, Gokhroo, G, Golob, B, Gorišek, A, Haba, J, Hayasaka, K, Hazumi, M, Hinz, L, Hokuue, T, Hoshi, Y, Hou, S, Hou, WS, Hsiung, YB, Iijima, T, Imoto, A, Inami, K, Ishikawa, A, Itoh, R, Iwasaki, M, Iwasaki, Y, Kang, JH, Kang, JS, Kapusta, P, Katayama, N, Kawai, H, Kawasaki, T, Khan, HR, Kichimi, H, Kim, HJ, Kim, SK, Kim, SM, Kinoshita, K, Korpar, S, Križan, P, Krokovny, P, Kumar, S, Kuo, CC, Kuzmin, A, Kwon, Y, Leder, G, Lee, SE, Lesiak, T, Li, J, Lin, SW, Liventsev, D, Mandl, F, Matsumoto, T, Matyja, A, Mitaroff, W, Miyake, H, Miyata, H, Mizuk, R, Moloney, GR, Nagamine, T, Nagasaka, Y, Nakano, E, Nakao, M, Nakazawa, H, Natkaniec, Z, Nishida, S, Nitoh, O, Ogawa, S, Ohshima, T, Okabe, T, Olsen, SL, Ostrowicz, W, Ozaki, H, Palka, H, Park, CW, Parslow, N, Peak, LS, Pestotnik, R, Piilonen, LE, Root, N, Rozanska, M, Sagawa, H, Sakai, Y, Sato, N, Schietinger, T, Schneider, O, Schümann, J, Senyo, K, Sevior, ME, Shibata, T, Shibuya, H, Shwartz, B, Sidorov, V, Singh, JB, Somov, A, Stamen, R, Stanič, S, Starič, M, Sumisawa, K, Sumiyoshi, T, Tajima, O, Takasaki, F, Tamai, K, Tamura, N, Tanaka, M, Teramoto, Y, Tian, XC, Tsukamoto, T, Uehara, S, Uglov, T, Ueno, K, Uno, S, Urquijo, P, Varner, G, Varvell, KE, Villa, S, Wang, CC, Wang, CH, Watanabe, M, Xie, QL, Yamaguchi, A, Yamashita, Y, Yamauchi, M, Yang, H, Ying, J, Zhang, CC, Zhang, LM, Zhang, ZP, Zhilich, V, Žontar, D & Zürcher, D 2005, 'Observation of B+→pΛ̄γ', Physical Review Letters, vol. 95, no. 6, 061802. https://doi.org/10.1103/PhysRevLett.95.061802

Observation of B+→pΛ̄γ. / Lee, Y. J.; Wang, M. Z.; Abe, K.; Abe, K.; Aihara, H.; Asano, Y.; Aulchenko, V.; Aushev, T.; Bahinipati, S.; Bakich, A. M.; Bedny, I.; Bitenc, U.; Bizjak, I.; Bondar, A.; Bozek, A.; Bračko, M.; Brodzicka, J.; Browder, T. E.; Chang, M. C.; Chang, P.; Chao, Y.; Chen, A.; Chen, K. F.; Chen, W. T.; Cheon, B. G.; Chistov, R.; Choi, S. K.; Chuvikov, A.; Cole, S.; Dalseno, J.; Danilov, M.; Dash, M.; Drutskoy, A.; Eidelman, S.; Enari, Y.; Fang, F.; Fratina, S.; Gabyshev, N.; Garmash, A.; Gershon, T.; Gokhroo, G.; Golob, B.; Gorišek, A.; Haba, J.; Hayasaka, K.; Hazumi, M.; Hinz, L.; Hokuue, T.; Hoshi, Y.; Hou, S.; Hou, W. S.; Hsiung, Y. B.; Iijima, T.; Imoto, A.; Inami, K.; Ishikawa, A.; Itoh, R.; Iwasaki, M.; Iwasaki, Y.; Kang, Ju Hwan; Kang, J. S.; Kapusta, P.; Katayama, N.; Kawai, H.; Kawasaki, T.; Khan, H. R.; Kichimi, H.; Kim, H. J.; Kim, S. K.; Kim, S. M.; Kinoshita, K.; Korpar, S.; Križan, P.; Krokovny, P.; Kumar, S.; Kuo, C. C.; Kuzmin, A.; Kwon, Youngjoon; Leder, G.; Lee, S. E.; Lesiak, T.; Li, J.; Lin, S. W.; Liventsev, D.; Mandl, F.; Matsumoto, T.; Matyja, A.; Mitaroff, W.; Miyake, H.; Miyata, H.; Mizuk, R.; Moloney, G. R.; Nagamine, T.; Nagasaka, Y.; Nakano, E.; Nakao, M.; Nakazawa, H.; Natkaniec, Z.; Nishida, S.; Nitoh, O.; Ogawa, S.; Ohshima, T.; Okabe, T.; Olsen, S. L.; Ostrowicz, W.; Ozaki, H.; Palka, H.; Park, C. W.; Parslow, N.; Peak, L. S.; Pestotnik, R.; Piilonen, L. E.; Root, N.; Rozanska, M.; Sagawa, H.; Sakai, Y.; Sato, N.; Schietinger, T.; Schneider, O.; Schümann, J.; Senyo, K.; Sevior, M. E.; Shibata, T.; Shibuya, H.; Shwartz, B.; Sidorov, V.; Singh, J. B.; Somov, A.; Stamen, R.; Stanič, S.; Starič, M.; Sumisawa, K.; Sumiyoshi, T.; Tajima, O.; Takasaki, F.; Tamai, K.; Tamura, N.; Tanaka, M.; Teramoto, Y.; Tian, X. C.; Tsukamoto, T.; Uehara, S.; Uglov, T.; Ueno, K.; Uno, S.; Urquijo, P.; Varner, G.; Varvell, K. E.; Villa, S.; Wang, C. C.; Wang, C. H.; Watanabe, M.; Xie, Q. L.; Yamaguchi, A.; Yamashita, Y.; Yamauchi, M.; Yang, Heyoung; Ying, J.; Zhang, C. C.; Zhang, L. M.; Zhang, Z. P.; Zhilich, V.; Žontar, D.; Zürcher, D.

In: Physical Review Letters, Vol. 95, No. 6, 061802, 05.08.2005.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Observation of B+→pΛ̄γ

AU - Lee, Y. J.

AU - Wang, M. Z.

AU - Abe, K.

AU - Abe, K.

AU - Aihara, H.

AU - Asano, Y.

AU - Aulchenko, V.

AU - Aushev, T.

AU - Bahinipati, S.

AU - Bakich, A. M.

AU - Bedny, I.

AU - Bitenc, U.

AU - Bizjak, I.

AU - Bondar, A.

AU - Bozek, A.

AU - Bračko, M.

AU - Brodzicka, J.

AU - Browder, T. E.

AU - Chang, M. C.

AU - Chang, P.

AU - Chao, Y.

AU - Chen, A.

AU - Chen, K. F.

AU - Chen, W. T.

AU - Cheon, B. G.

AU - Chistov, R.

AU - Choi, S. K.

AU - Chuvikov, A.

AU - Cole, S.

AU - Dalseno, J.

AU - Danilov, M.

AU - Dash, M.

AU - Drutskoy, A.

AU - Eidelman, S.

AU - Enari, Y.

AU - Fang, F.

AU - Fratina, S.

AU - Gabyshev, N.

AU - Garmash, A.

AU - Gershon, T.

AU - Gokhroo, G.

AU - Golob, B.

AU - Gorišek, A.

AU - Haba, J.

AU - Hayasaka, K.

AU - Hazumi, M.

AU - Hinz, L.

AU - Hokuue, T.

AU - Hoshi, Y.

AU - Hou, S.

AU - Hou, W. S.

AU - Hsiung, Y. B.

AU - Iijima, T.

AU - Imoto, A.

AU - Inami, K.

AU - Ishikawa, A.

AU - Itoh, R.

AU - Iwasaki, M.

AU - Iwasaki, Y.

AU - Kang, Ju Hwan

AU - Kang, J. S.

AU - Kapusta, P.

AU - Katayama, N.

AU - Kawai, H.

AU - Kawasaki, T.

AU - Khan, H. R.

AU - Kichimi, H.

AU - Kim, H. J.

AU - Kim, S. K.

AU - Kim, S. M.

AU - Kinoshita, K.

AU - Korpar, S.

AU - Križan, P.

AU - Krokovny, P.

AU - Kumar, S.

AU - Kuo, C. C.

AU - Kuzmin, A.

AU - Kwon, Youngjoon

AU - Leder, G.

AU - Lee, S. E.

AU - Lesiak, T.

AU - Li, J.

AU - Lin, S. W.

AU - Liventsev, D.

AU - Mandl, F.

AU - Matsumoto, T.

AU - Matyja, A.

AU - Mitaroff, W.

AU - Miyake, H.

AU - Miyata, H.

AU - Mizuk, R.

AU - Moloney, G. R.

AU - Nagamine, T.

AU - Nagasaka, Y.

AU - Nakano, E.

AU - Nakao, M.

AU - Nakazawa, H.

AU - Natkaniec, Z.

AU - Nishida, S.

AU - Nitoh, O.

AU - Ogawa, S.

AU - Ohshima, T.

AU - Okabe, T.

AU - Olsen, S. L.

AU - Ostrowicz, W.

AU - Ozaki, H.

AU - Palka, H.

AU - Park, C. W.

AU - Parslow, N.

AU - Peak, L. S.

AU - Pestotnik, R.

AU - Piilonen, L. E.

AU - Root, N.

AU - Rozanska, M.

AU - Sagawa, H.

AU - Sakai, Y.

AU - Sato, N.

AU - Schietinger, T.

AU - Schneider, O.

AU - Schümann, J.

AU - Senyo, K.

AU - Sevior, M. E.

AU - Shibata, T.

AU - Shibuya, H.

AU - Shwartz, B.

AU - Sidorov, V.

AU - Singh, J. B.

AU - Somov, A.

AU - Stamen, R.

AU - Stanič, S.

AU - Starič, M.

AU - Sumisawa, K.

AU - Sumiyoshi, T.

AU - Tajima, O.

AU - Takasaki, F.

AU - Tamai, K.

AU - Tamura, N.

AU - Tanaka, M.

AU - Teramoto, Y.

AU - Tian, X. C.

AU - Tsukamoto, T.

AU - Uehara, S.

AU - Uglov, T.

AU - Ueno, K.

AU - Uno, S.

AU - Urquijo, P.

AU - Varner, G.

AU - Varvell, K. E.

AU - Villa, S.

AU - Wang, C. C.

AU - Wang, C. H.

AU - Watanabe, M.

AU - Xie, Q. L.

AU - Yamaguchi, A.

AU - Yamashita, Y.

AU - Yamauchi, M.

AU - Yang, Heyoung

AU - Ying, J.

AU - Zhang, C. C.

AU - Zhang, L. M.

AU - Zhang, Z. P.

AU - Zhilich, V.

AU - Žontar, D.

AU - Zürcher, D.

PY - 2005/8/5

Y1 - 2005/8/5

N2 - We report the first observation of the radiative hyperonic B decay B+→pΛ̄γ, using a 140fb-1 data sample recorded on the Υ(4S) resonance with the Belle detector at the KEKB asymmetric energy e+e- collider. The measured branching fraction is B(B+→pΛ̄γ)= (2.16-0.53+0.58±0.20)×10-6. We examine its MpΛ̄ distribution and observe a peak near threshold. This feature is expected by the short-distance b→sγ transition. A search for B+→pΣ̄ 0γ yields no significant signal, and we set a 90% confidence-level upper limit on the branching fraction of B(B+→pΣ̄0γ)<4. 6×10-6.

AB - We report the first observation of the radiative hyperonic B decay B+→pΛ̄γ, using a 140fb-1 data sample recorded on the Υ(4S) resonance with the Belle detector at the KEKB asymmetric energy e+e- collider. The measured branching fraction is B(B+→pΛ̄γ)= (2.16-0.53+0.58±0.20)×10-6. We examine its MpΛ̄ distribution and observe a peak near threshold. This feature is expected by the short-distance b→sγ transition. A search for B+→pΣ̄ 0γ yields no significant signal, and we set a 90% confidence-level upper limit on the branching fraction of B(B+→pΣ̄0γ)<4. 6×10-6.

UR - http://www.scopus.com/inward/record.url?scp=27144467688&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=27144467688&partnerID=8YFLogxK

U2 - 10.1103/PhysRevLett.95.061802

DO - 10.1103/PhysRevLett.95.061802

M3 - Article

VL - 95

JO - Physical Review Letters

JF - Physical Review Letters

SN - 0031-9007

IS - 6

M1 - 061802

ER -

Lee YJ, Wang MZ, Abe K, Abe K, Aihara H, Asano Y et al. Observation of B+→pΛ̄γ. Physical Review Letters. 2005 Aug 5;95(6). 061802. https://doi.org/10.1103/PhysRevLett.95.061802