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Title: Search for the rare decay of B + + ν γ with improved hadronic tagging

Abstract

We present the result of the search for the rare $B$ meson decay of $${B}^{+}{\rightarrow}{{\ell}}^{+}{{\nu}}_{{\ell}}{\gamma}$$ with $${\ell}=\mathrm{e},{\mu}$$. For the search the full data set recorded by the Belle experiment of $$711\text{ }\text{ }{\mathrm{fb}}^{{-}1}$$ integrated luminosity near the $$\mathrm{{\Upsilon}}(4\mathrm{S})$$ resonance is used. Signal candidates are reconstructed for photon energies $${E}_{{\gamma}}$$ larger than 1 GeV using a novel multivariate tagging algorithm. The novel algorithm fully reconstructs the second $B$ meson produced in the collision using hadronic modes and was specifically trained to recognize the signal signature in combination with hadronic tag-side $B$ meson decays. This approach greatly enhances the performance. Background processes that can mimic this signature, mainly charmless semileptonic decays and continuum processes, are suppressed using multivariate methods. The number of signal candidates is determined by analyzing the missing mass squared distribution as inferred from the signal side particles and the kinematic properties of the tag-side $B$ meson. No significant excess over the background-only hypothesis is observed and upper limits on the partial branching fraction $$\mathrm{{\Delta}}\mathcal{B}$$ with E γ > 1 GeV individually for electron and muon final states as well as for the average branching fraction of both lepton final states are reported. We find a Bayesian upper limit of Δβ (Β + → $${\ell}$$ +ν $${\ell}$$γ) < 3.0 x 10 -6 at 90% CL and also report an upper limit on the first inverse moment of the light-cone distribution amplitude of the $B$ meson of λ Β > 0.24 GeV at 90% CL.

Authors:
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Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Contributing Org.:
The Belle Collaboration
OSTI Identifier:
1489074
Alternate Identifier(s):
OSTI ID: 1491692
Report Number(s):
BNL-210890-2019-JAAM
Journal ID: ISSN 2470-0010
Grant/Contract Number:  
SC0012704
Resource Type:
Published Article
Journal Name:
Physical Review D
Additional Journal Information:
Journal Volume: 98; Journal Issue: 11; 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; branching fraction; leptonic, semileptonic & radiative decays; rare decays

Citation Formats

Gelb, M., Bernlochner, F. U., Goldenzweig, P., Metzner, F., Adachi, I., Aihara, H., Al Said, S., Asner, D. M., Atmacan, H., Aushev, T., Ayad, R., Babu, V., Badhrees, I., Bansal, V., Behera, P., Beleño, C., Bhuyan, B., Biswal, J., Bobrov, A., Bračko, M., Braun, N., Cao, L., Červenkov, D., Chekelian, V., Chen, A., Cheon, B. G., Chilikin, K., Cho, K., Choi, S. -K., Choi, Y., Choudhury, S., Cinabro, D., Cunliffe, S., Dash, N., Di Carlo, S., Doležal, Z., Dong, T. V., Eidelman, S., Epifanov, D., Fast, J. E., Ferber, T., Frey, A., Fulsom, B. G., Garg, R., Gaur, V., Gabyshev, N., Garmash, A., Gemmler, J., Giri, A., Greenwald, D., Haba, J., Hara, T., Hayasaka, K., Hayashii, H., Hou, W. -S., Inami, K., Inguglia, G., Ishikawa, A., Itoh, R., Iwasaki, M., Iwasaki, Y., Jacobs, W. W., Jia, S., Jin, Y., Joffe, D., Joo, K. K., Kahn, J., Kaliyar, A. B., Kawasaki, T., Kichimi, H., Kiesling, C., Kim, D. Y., Kim, H. J., Kim, S. H., Kodyš, P., Korpar, S., Kotchetkov, D., Križan, P., Kroeger, R., Krokovny, P., Kuhr, T., Kulasiri, R., Kuzmin, A., Kwon, Y. -J., Lange, J. S., Lee, I. S., Lee, J. K., Lee, J. Y., Lee, S. C., Li, Y. B., Li Gioi, L., Libby, J., Liventsev, D., Lu, P. -C., Lubej, M., Luo, T., MacNaughton, J., Masuda, M., Merola, M., Miyabayashi, K., Miyata, H., Mizuk, R., Mohanty, G. B., Mori, T., Mrvar, M., Mussa, R., Nakao, M., Nath, K. J., Natkaniec, Z., Nayak, M., Niiyama, M., Nisar, N. K., Nishida, S., Ogawa, S., Pakhlov, P., Pakhlova, G., Pal, B., Pardi, S., Paul, S., Pedlar, T. K., Pestotnik, R., Piilonen, L. E., Popov, V., Prencipe, E., Prim, M., Ritter, M., Rostomyan, A., Russo, G., Sahoo, D., Sakai, Y., Salehi, M., Sandilya, S., Santelj, L., Sanuki, T., Savinov, V., Schneider, O., Schnell, G., Schueler, J., Schwanda, C., Seino, Y., Senyo, K., Seon, O., Sevior, M. E., Shen, C. P., Shibata, T. -A., Shiu, J. -G., Shwartz, B., Simon, F., Solovieva, E., Stanič, S., Starič, M., Strube, J. F., Sumihama, M., Sumiyoshi, T., Sutcliffe, W., Takizawa, M., Tanida, K., Tao, Y., Tenchini, F., Uchida, M., Uglov, T., Unno, Y., Uno, S., Urquijo, P., Van Tonder, R., Varner, G., Varvell, K. E., Wang, B., Wang, C. H., Wang, M. -Z., Wang, P., Wang, X. L., Watanabe, M., Watanuki, S., Widmann, E., Won, E., Yamamoto, H., Yang, S. B., Ye, H., Yin, J. H., Yuan, C. Z., Yusa, Y., Zakharov, S., Zhang, Z. P., Zhilich, V., Zhukova, V., and Zhulanov, V. Search for the rare decay of B+→ℓ+νℓγ with improved hadronic tagging. United States: N. p., 2018. Web. doi:10.1103/PhysRevD.98.112016.
Gelb, M., Bernlochner, F. U., Goldenzweig, P., Metzner, F., Adachi, I., Aihara, H., Al Said, S., Asner, D. M., Atmacan, H., Aushev, T., Ayad, R., Babu, V., Badhrees, I., Bansal, V., Behera, P., Beleño, C., Bhuyan, B., Biswal, J., Bobrov, A., Bračko, M., Braun, N., Cao, L., Červenkov, D., Chekelian, V., Chen, A., Cheon, B. G., Chilikin, K., Cho, K., Choi, S. -K., Choi, Y., Choudhury, S., Cinabro, D., Cunliffe, S., Dash, N., Di Carlo, S., Doležal, Z., Dong, T. V., Eidelman, S., Epifanov, D., Fast, J. E., Ferber, T., Frey, A., Fulsom, B. G., Garg, R., Gaur, V., Gabyshev, N., Garmash, A., Gemmler, J., Giri, A., Greenwald, D., Haba, J., Hara, T., Hayasaka, K., Hayashii, H., Hou, W. -S., Inami, K., Inguglia, G., Ishikawa, A., Itoh, R., Iwasaki, M., Iwasaki, Y., Jacobs, W. W., Jia, S., Jin, Y., Joffe, D., Joo, K. K., Kahn, J., Kaliyar, A. B., Kawasaki, T., Kichimi, H., Kiesling, C., Kim, D. Y., Kim, H. J., Kim, S. H., Kodyš, P., Korpar, S., Kotchetkov, D., Križan, P., Kroeger, R., Krokovny, P., Kuhr, T., Kulasiri, R., Kuzmin, A., Kwon, Y. -J., Lange, J. S., Lee, I. S., Lee, J. K., Lee, J. Y., Lee, S. C., Li, Y. B., Li Gioi, L., Libby, J., Liventsev, D., Lu, P. -C., Lubej, M., Luo, T., MacNaughton, J., Masuda, M., Merola, M., Miyabayashi, K., Miyata, H., Mizuk, R., Mohanty, G. B., Mori, T., Mrvar, M., Mussa, R., Nakao, M., Nath, K. J., Natkaniec, Z., Nayak, M., Niiyama, M., Nisar, N. K., Nishida, S., Ogawa, S., Pakhlov, P., Pakhlova, G., Pal, B., Pardi, S., Paul, S., Pedlar, T. K., Pestotnik, R., Piilonen, L. E., Popov, V., Prencipe, E., Prim, M., Ritter, M., Rostomyan, A., Russo, G., Sahoo, D., Sakai, Y., Salehi, M., Sandilya, S., Santelj, L., Sanuki, T., Savinov, V., Schneider, O., Schnell, G., Schueler, J., Schwanda, C., Seino, Y., Senyo, K., Seon, O., Sevior, M. E., Shen, C. P., Shibata, T. -A., Shiu, J. -G., Shwartz, B., Simon, F., Solovieva, E., Stanič, S., Starič, M., Strube, J. F., Sumihama, M., Sumiyoshi, T., Sutcliffe, W., Takizawa, M., Tanida, K., Tao, Y., Tenchini, F., Uchida, M., Uglov, T., Unno, Y., Uno, S., Urquijo, P., Van Tonder, R., Varner, G., Varvell, K. E., Wang, B., Wang, C. H., Wang, M. -Z., Wang, P., Wang, X. L., Watanabe, M., Watanuki, S., Widmann, E., Won, E., Yamamoto, H., Yang, S. B., Ye, H., Yin, J. H., Yuan, C. Z., Yusa, Y., Zakharov, S., Zhang, Z. P., Zhilich, V., Zhukova, V., & Zhulanov, V. Search for the rare decay of B+→ℓ+νℓγ with improved hadronic tagging. United States. doi:10.1103/PhysRevD.98.112016.
Gelb, M., Bernlochner, F. U., Goldenzweig, P., Metzner, F., Adachi, I., Aihara, H., Al Said, S., Asner, D. M., Atmacan, H., Aushev, T., Ayad, R., Babu, V., Badhrees, I., Bansal, V., Behera, P., Beleño, C., Bhuyan, B., Biswal, J., Bobrov, A., Bračko, M., Braun, N., Cao, L., Červenkov, D., Chekelian, V., Chen, A., Cheon, B. G., Chilikin, K., Cho, K., Choi, S. -K., Choi, Y., Choudhury, S., Cinabro, D., Cunliffe, S., Dash, N., Di Carlo, S., Doležal, Z., Dong, T. V., Eidelman, S., Epifanov, D., Fast, J. E., Ferber, T., Frey, A., Fulsom, B. G., Garg, R., Gaur, V., Gabyshev, N., Garmash, A., Gemmler, J., Giri, A., Greenwald, D., Haba, J., Hara, T., Hayasaka, K., Hayashii, H., Hou, W. -S., Inami, K., Inguglia, G., Ishikawa, A., Itoh, R., Iwasaki, M., Iwasaki, Y., Jacobs, W. W., Jia, S., Jin, Y., Joffe, D., Joo, K. K., Kahn, J., Kaliyar, A. B., Kawasaki, T., Kichimi, H., Kiesling, C., Kim, D. Y., Kim, H. J., Kim, S. H., Kodyš, P., Korpar, S., Kotchetkov, D., Križan, P., Kroeger, R., Krokovny, P., Kuhr, T., Kulasiri, R., Kuzmin, A., Kwon, Y. -J., Lange, J. S., Lee, I. S., Lee, J. K., Lee, J. Y., Lee, S. C., Li, Y. B., Li Gioi, L., Libby, J., Liventsev, D., Lu, P. -C., Lubej, M., Luo, T., MacNaughton, J., Masuda, M., Merola, M., Miyabayashi, K., Miyata, H., Mizuk, R., Mohanty, G. B., Mori, T., Mrvar, M., Mussa, R., Nakao, M., Nath, K. J., Natkaniec, Z., Nayak, M., Niiyama, M., Nisar, N. K., Nishida, S., Ogawa, S., Pakhlov, P., Pakhlova, G., Pal, B., Pardi, S., Paul, S., Pedlar, T. K., Pestotnik, R., Piilonen, L. E., Popov, V., Prencipe, E., Prim, M., Ritter, M., Rostomyan, A., Russo, G., Sahoo, D., Sakai, Y., Salehi, M., Sandilya, S., Santelj, L., Sanuki, T., Savinov, V., Schneider, O., Schnell, G., Schueler, J., Schwanda, C., Seino, Y., Senyo, K., Seon, O., Sevior, M. E., Shen, C. P., Shibata, T. -A., Shiu, J. -G., Shwartz, B., Simon, F., Solovieva, E., Stanič, S., Starič, M., Strube, J. F., Sumihama, M., Sumiyoshi, T., Sutcliffe, W., Takizawa, M., Tanida, K., Tao, Y., Tenchini, F., Uchida, M., Uglov, T., Unno, Y., Uno, S., Urquijo, P., Van Tonder, R., Varner, G., Varvell, K. E., Wang, B., Wang, C. H., Wang, M. -Z., Wang, P., Wang, X. L., Watanabe, M., Watanuki, S., Widmann, E., Won, E., Yamamoto, H., Yang, S. B., Ye, H., Yin, J. H., Yuan, C. Z., Yusa, Y., Zakharov, S., Zhang, Z. P., Zhilich, V., Zhukova, V., and Zhulanov, V. Fri . "Search for the rare decay of B+→ℓ+νℓγ with improved hadronic tagging". United States. doi:10.1103/PhysRevD.98.112016.
@article{osti_1489074,
title = {Search for the rare decay of B+→ℓ+νℓγ with improved hadronic tagging},
author = {Gelb, M. and Bernlochner, F. U. and Goldenzweig, P. and Metzner, F. and Adachi, I. and Aihara, H. and Al Said, S. and Asner, D. M. and Atmacan, H. and Aushev, T. and Ayad, R. and Babu, V. and Badhrees, I. and Bansal, V. and Behera, P. and Beleño, C. and Bhuyan, B. and Biswal, J. and Bobrov, A. and Bračko, M. and Braun, N. and Cao, L. and Červenkov, D. and Chekelian, V. and Chen, A. and Cheon, B. G. and Chilikin, K. and Cho, K. and Choi, S. -K. and Choi, Y. and Choudhury, S. and Cinabro, D. and Cunliffe, S. and Dash, N. and Di Carlo, S. and Doležal, Z. 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 Garg, R. and Gaur, V. and Gabyshev, N. and Garmash, A. and Gemmler, J. and Giri, A. and Greenwald, D. and Haba, J. and Hara, T. and Hayasaka, K. and Hayashii, H. and Hou, W. -S. and Inami, K. and Inguglia, G. and Ishikawa, A. and Itoh, R. and Iwasaki, M. and Iwasaki, Y. and Jacobs, W. W. and Jia, S. and Jin, Y. and Joffe, D. and Joo, K. K. and Kahn, J. and Kaliyar, A. B. and Kawasaki, T. and Kichimi, H. and Kiesling, C. and Kim, D. Y. and Kim, H. J. and Kim, S. H. and Kodyš, P. and Korpar, S. and Kotchetkov, D. and Križan, P. and Kroeger, R. and Krokovny, P. and Kuhr, T. and Kulasiri, R. and Kuzmin, A. and Kwon, Y. -J. and Lange, J. S. and Lee, I. S. and Lee, J. K. and Lee, J. Y. and Lee, S. C. and Li, Y. B. and Li Gioi, L. and Libby, J. and Liventsev, D. and Lu, P. -C. and Lubej, M. and Luo, T. and MacNaughton, J. and Masuda, M. and Merola, M. and Miyabayashi, K. and Miyata, H. and Mizuk, R. and Mohanty, G. B. and Mori, T. and Mrvar, M. and Mussa, R. and Nakao, M. and Nath, K. J. and Natkaniec, Z. and Nayak, M. and Niiyama, M. and Nisar, N. K. and Nishida, S. and Ogawa, S. and Pakhlov, P. and Pakhlova, G. and Pal, B. and Pardi, S. and Paul, S. and Pedlar, T. K. and Pestotnik, R. and Piilonen, L. E. and Popov, V. and Prencipe, E. and Prim, M. and Ritter, M. and Rostomyan, A. and Russo, G. and Sahoo, D. and Sakai, Y. and Salehi, M. and Sandilya, S. and Santelj, L. and Sanuki, T. and Savinov, V. and Schneider, O. and Schnell, G. and Schueler, J. and Schwanda, C. and Seino, Y. and Senyo, K. and Seon, O. and Sevior, M. E. and Shen, C. P. and Shibata, T. -A. and Shiu, J. -G. and Shwartz, B. and Simon, F. and Solovieva, E. and Stanič, S. and Starič, M. and Strube, J. F. and Sumihama, M. and Sumiyoshi, T. and Sutcliffe, W. and Takizawa, M. and Tanida, K. and Tao, Y. and Tenchini, F. and Uchida, M. and Uglov, T. and Unno, Y. and Uno, S. and Urquijo, P. and Van Tonder, R. and Varner, G. and Varvell, K. E. and Wang, B. and Wang, C. H. and Wang, M. -Z. and Wang, P. and Wang, X. L. and Watanabe, M. and Watanuki, S. and Widmann, E. and Won, E. and Yamamoto, H. and Yang, S. B. and Ye, H. and Yin, J. H. and Yuan, C. Z. and Yusa, Y. and Zakharov, S. and Zhang, Z. P. and Zhilich, V. and Zhukova, V. and Zhulanov, V.},
abstractNote = {We present the result of the search for the rare $B$ meson decay of ${B}^{+}{\rightarrow}{{\ell}}^{+}{{\nu}}_{{\ell}}{\gamma}$ with ${\ell}=\mathrm{e},{\mu}$. For the search the full data set recorded by the Belle experiment of $711\text{ }\text{ }{\mathrm{fb}}^{{-}1}$ integrated luminosity near the $\mathrm{{\Upsilon}}(4\mathrm{S})$ resonance is used. Signal candidates are reconstructed for photon energies ${E}_{{\gamma}}$ larger than 1 GeV using a novel multivariate tagging algorithm. The novel algorithm fully reconstructs the second $B$ meson produced in the collision using hadronic modes and was specifically trained to recognize the signal signature in combination with hadronic tag-side $B$ meson decays. This approach greatly enhances the performance. Background processes that can mimic this signature, mainly charmless semileptonic decays and continuum processes, are suppressed using multivariate methods. The number of signal candidates is determined by analyzing the missing mass squared distribution as inferred from the signal side particles and the kinematic properties of the tag-side $B$ meson. No significant excess over the background-only hypothesis is observed and upper limits on the partial branching fraction $\mathrm{{\Delta}}\mathcal{B}$ with Eγ > 1 GeV individually for electron and muon final states as well as for the average branching fraction of both lepton final states are reported. We find a Bayesian upper limit of Δβ (Β+ → ${\ell}$+ν${\ell}$γ) < 3.0 x 10-6 at 90% CL and also report an upper limit on the first inverse moment of the light-cone distribution amplitude of the $B$ meson of λΒ > 0.24 GeV at 90% CL.},
doi = {10.1103/PhysRevD.98.112016},
journal = {Physical Review D},
number = 11,
volume = 98,
place = {United States},
year = {2018},
month = {12}
}

Journal Article:
Free Publicly Available Full Text
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DOI: 10.1103/PhysRevD.98.112016

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Cited by: 3 works
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Figures / Tables:

FIG. 1 FIG. 1: Extracted calibration factors for the applied tagging algorithm found for the three different semileptonic calibration channels. The inner and outer interval represents the statistical and systematic uncertainty, respectively. The blue band depicts the 1σ uncertainty band of the averaged calibration factor.

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    B meson distribution amplitude from B→γℓν
    journal, December 2011


    Averages of b-hadron, c-hadron, and $$\tau $$ τ -lepton properties as of summer 2016
    journal, December 2017


      Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.