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Title: Measurement of the τ Lepton Polarization and R ( D * ) in the Decay B ¯ D * τ - ν ¯ τ

Abstract

Here, we discuss the first measurement of the τ lepton polarization P τ ( D * ) in the decay B ¯ D*τ- ν ¯ τ as well as a new measurement of the ratio of the branching fractions R(D*)=B( B ¯ D*τ- ν ¯ τ )/B( B ¯ D*- ν ¯ ) , where - denotes an electron or a muon, and the τ is reconstructed in the modes τ-π- ν τ and τ-ρ- ν τ . We use the full data sample of 772×106B B ¯ pairs recorded with the Belle detector at the KEKB electron-positron collider. Our findings, P τ (D*)=-0.38±0.51 ( stat ) - 0.16 + 0.21 ( syst ) and R ( D * ) = 0.270 ± 0.035 ( stat ) - 0.025 + 0.028 ( syst ) , are consistent with the theoretical predictions of the standard model.

Authors:
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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); National Science Foundation (NSF)
Contributing Org.:
Belle Collaboration
OSTI Identifier:
1594359
Alternate Identifier(s):
OSTI ID: 1359986
Grant/Contract Number:  
SC0009973
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 118; Journal Issue: 21; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Hirose, S., Iijima, T., Adachi, I., Adamczyk, K., Aihara, H., Al Said, S., Asner, D. M., Atmacan, H., Aulchenko, V., Aushev, T., Ayad, R., Babu, V., Badhrees, I., Bakich, A. M., Bansal, V., Barberio, E., Behera, P., Berger, M., Bhuyan, B., Biswal, J., Bondar, A., Bonvicini, G., Bozek, A., Bračko, M., Browder, T. E., Červenkov, D., Chang, P., Chen, A., Cheon, B. G., Chilikin, K., Chistov, R., Cho, K., Choi, Y., Cinabro, D., Danilov, M., Dash, N., Di Carlo, S., Dingfelder, J., Doležal, Z., Drásal, Z., Dutta, D., Eidelman, S., Epifanov, D., Farhat, H., Fast, J. E., Ferber, T., Fulsom, B. G., Gaur, V., Gabyshev, N., Garmash, A., Goldenzweig, P., Golob, B., Greenwald, D., Grygier, J., Haba, J., Hara, K., Hasenbusch, J., Hayasaka, K., Hayashii, H., Higuchi, T., Hou, W. -S., Hsu, C. -L., Inami, K., Inguglia, G., Ishikawa, A., Itoh, R., Iwasaki, Y., Jacobs, W. W., Jaegle, I., Jin, Y., Joffe, D., Joo, K. K., Julius, T., Kato, Y., Kawasaki, T., Kichimi, H., Kiesling, C., Kim, D. Y., Kim, J. B., Kim, K. T., Kim, M. J., Kim, S. H., Kinoshita, K., Kodyš, P., Korpar, S., Kotchetkov, D., Križan, P., Krokovny, P., Kuhr, T., Kulasiri, R., Kumar, R., Kwon, Y. -J., Lange, J. S., Li, C. H., Li, L., Li, Y., Li Gioi, L., Libby, J., Liventsev, D., Lubej, M., Luo, T., MacNaughton, J., Masuda, M., Matsuda, T., Matvienko, D., Miyabayashi, K., Miyake, H., Miyata, H., Mizuk, R., Mohanty, G. B., Moon, H. K., Mori, T., Mussa, R., Nakao, M., Nanut, T., Nath, K. J., Natkaniec, Z., Nayak, M., Niiyama, M., Nisar, N. K., Nishida, S., Ogawa, S., Okuno, S., Ono, H., Onuki, Y., Ostrowicz, W., Pakhlov, P., Pakhlova, G., Pal, B., Park, C. W., Park, H., Paul, S., Pesántez, L., Pestotnik, R., Piilonen, L. E., Prasanth, K., Ritter, M., Rostomyan, A., Rozanska, M., Sakai, Y., Sandilya, S., Santelj, L., Sanuki, T., Sato, Y., Savinov, V., Schlüter, T., Schneider, O., Schnell, G., Schwanda, C., Seino, Y., Senyo, K., Seon, O., Sevior, M. E., Shebalin, V., Shen, C. P., Shibata, T. -A., Shiu, J. -G., Simon, F., Sokolov, A., Solovieva, E., Starič, M., Strube, J. F., Sumisawa, K., Sumiyoshi, T., Takizawa, M., Tamponi, U., Tenchini, F., Trabelsi, K., Uchida, M., Uglov, T., Unno, Y., Uno, S., Urquijo, P., Ushiroda, Y., Usov, Y., Van Hulse, C., Varner, G., Varvell, K. E., Vossen, A., Wang, C. H., Wang, M. -Z., Wang, P., Watanabe, M., Watanabe, Y., Widmann, E., Won, E., Yamashita, Y., Ye, H., Yelton, J., Yuan, C. Z., Zhang, Z. P., Zhilich, V., Zhulanov, V., and Zupanc, A. Measurement of the τ Lepton Polarization and R(D*) in the Decay B¯→D*τ-ν¯τ. United States: N. p., 2017. Web. doi:10.1103/PhysRevLett.118.211801.
Hirose, S., Iijima, T., Adachi, I., Adamczyk, K., Aihara, H., Al Said, S., Asner, D. M., Atmacan, H., Aulchenko, V., Aushev, T., Ayad, R., Babu, V., Badhrees, I., Bakich, A. M., Bansal, V., Barberio, E., Behera, P., Berger, M., Bhuyan, B., Biswal, J., Bondar, A., Bonvicini, G., Bozek, A., Bračko, M., Browder, T. E., Červenkov, D., Chang, P., Chen, A., Cheon, B. G., Chilikin, K., Chistov, R., Cho, K., Choi, Y., Cinabro, D., Danilov, M., Dash, N., Di Carlo, S., Dingfelder, J., Doležal, Z., Drásal, Z., Dutta, D., Eidelman, S., Epifanov, D., Farhat, H., Fast, J. E., Ferber, T., Fulsom, B. G., Gaur, V., Gabyshev, N., Garmash, A., Goldenzweig, P., Golob, B., Greenwald, D., Grygier, J., Haba, J., Hara, K., Hasenbusch, J., Hayasaka, K., Hayashii, H., Higuchi, T., Hou, W. -S., Hsu, C. -L., Inami, K., Inguglia, G., Ishikawa, A., Itoh, R., Iwasaki, Y., Jacobs, W. W., Jaegle, I., Jin, Y., Joffe, D., Joo, K. K., Julius, T., Kato, Y., Kawasaki, T., Kichimi, H., Kiesling, C., Kim, D. Y., Kim, J. B., Kim, K. T., Kim, M. J., Kim, S. H., Kinoshita, K., Kodyš, P., Korpar, S., Kotchetkov, D., Križan, P., Krokovny, P., Kuhr, T., Kulasiri, R., Kumar, R., Kwon, Y. -J., Lange, J. S., Li, C. H., Li, L., Li, Y., Li Gioi, L., Libby, J., Liventsev, D., Lubej, M., Luo, T., MacNaughton, J., Masuda, M., Matsuda, T., Matvienko, D., Miyabayashi, K., Miyake, H., Miyata, H., Mizuk, R., Mohanty, G. B., Moon, H. K., Mori, T., Mussa, R., Nakao, M., Nanut, T., Nath, K. J., Natkaniec, Z., Nayak, M., Niiyama, M., Nisar, N. K., Nishida, S., Ogawa, S., Okuno, S., Ono, H., Onuki, Y., Ostrowicz, W., Pakhlov, P., Pakhlova, G., Pal, B., Park, C. W., Park, H., Paul, S., Pesántez, L., Pestotnik, R., Piilonen, L. E., Prasanth, K., Ritter, M., Rostomyan, A., Rozanska, M., Sakai, Y., Sandilya, S., Santelj, L., Sanuki, T., Sato, Y., Savinov, V., Schlüter, T., Schneider, O., Schnell, G., Schwanda, C., Seino, Y., Senyo, K., Seon, O., Sevior, M. E., Shebalin, V., Shen, C. P., Shibata, T. -A., Shiu, J. -G., Simon, F., Sokolov, A., Solovieva, E., Starič, M., Strube, J. F., Sumisawa, K., Sumiyoshi, T., Takizawa, M., Tamponi, U., Tenchini, F., Trabelsi, K., Uchida, M., Uglov, T., Unno, Y., Uno, S., Urquijo, P., Ushiroda, Y., Usov, Y., Van Hulse, C., Varner, G., Varvell, K. E., Vossen, A., Wang, C. H., Wang, M. -Z., Wang, P., Watanabe, M., Watanabe, Y., Widmann, E., Won, E., Yamashita, Y., Ye, H., Yelton, J., Yuan, C. Z., Zhang, Z. P., Zhilich, V., Zhulanov, V., & Zupanc, A. Measurement of the τ Lepton Polarization and R(D*) in the Decay B¯→D*τ-ν¯τ. United States. https://doi.org/10.1103/PhysRevLett.118.211801
Hirose, S., Iijima, T., Adachi, I., Adamczyk, K., Aihara, H., Al Said, S., Asner, D. M., Atmacan, H., Aulchenko, V., Aushev, T., Ayad, R., Babu, V., Badhrees, I., Bakich, A. M., Bansal, V., Barberio, E., Behera, P., Berger, M., Bhuyan, B., Biswal, J., Bondar, A., Bonvicini, G., Bozek, A., Bračko, M., Browder, T. E., Červenkov, D., Chang, P., Chen, A., Cheon, B. G., Chilikin, K., Chistov, R., Cho, K., Choi, Y., Cinabro, D., Danilov, M., Dash, N., Di Carlo, S., Dingfelder, J., Doležal, Z., Drásal, Z., Dutta, D., Eidelman, S., Epifanov, D., Farhat, H., Fast, J. E., Ferber, T., Fulsom, B. G., Gaur, V., Gabyshev, N., Garmash, A., Goldenzweig, P., Golob, B., Greenwald, D., Grygier, J., Haba, J., Hara, K., Hasenbusch, J., Hayasaka, K., Hayashii, H., Higuchi, T., Hou, W. -S., Hsu, C. -L., Inami, K., Inguglia, G., Ishikawa, A., Itoh, R., Iwasaki, Y., Jacobs, W. W., Jaegle, I., Jin, Y., Joffe, D., Joo, K. K., Julius, T., Kato, Y., Kawasaki, T., Kichimi, H., Kiesling, C., Kim, D. Y., Kim, J. B., Kim, K. T., Kim, M. J., Kim, S. H., Kinoshita, K., Kodyš, P., Korpar, S., Kotchetkov, D., Križan, P., Krokovny, P., Kuhr, T., Kulasiri, R., Kumar, R., Kwon, Y. -J., Lange, J. S., Li, C. H., Li, L., Li, Y., Li Gioi, L., Libby, J., Liventsev, D., Lubej, M., Luo, T., MacNaughton, J., Masuda, M., Matsuda, T., Matvienko, D., Miyabayashi, K., Miyake, H., Miyata, H., Mizuk, R., Mohanty, G. B., Moon, H. K., Mori, T., Mussa, R., Nakao, M., Nanut, T., Nath, K. J., Natkaniec, Z., Nayak, M., Niiyama, M., Nisar, N. K., Nishida, S., Ogawa, S., Okuno, S., Ono, H., Onuki, Y., Ostrowicz, W., Pakhlov, P., Pakhlova, G., Pal, B., Park, C. W., Park, H., Paul, S., Pesántez, L., Pestotnik, R., Piilonen, L. E., Prasanth, K., Ritter, M., Rostomyan, A., Rozanska, M., Sakai, Y., Sandilya, S., Santelj, L., Sanuki, T., Sato, Y., Savinov, V., Schlüter, T., Schneider, O., Schnell, G., Schwanda, C., Seino, Y., Senyo, K., Seon, O., Sevior, M. E., Shebalin, V., Shen, C. P., Shibata, T. -A., Shiu, J. -G., Simon, F., Sokolov, A., Solovieva, E., Starič, M., Strube, J. F., Sumisawa, K., Sumiyoshi, T., Takizawa, M., Tamponi, U., Tenchini, F., Trabelsi, K., Uchida, M., Uglov, T., Unno, Y., Uno, S., Urquijo, P., Ushiroda, Y., Usov, Y., Van Hulse, C., Varner, G., Varvell, K. E., Vossen, A., Wang, C. H., Wang, M. -Z., Wang, P., Watanabe, M., Watanabe, Y., Widmann, E., Won, E., Yamashita, Y., Ye, H., Yelton, J., Yuan, C. Z., Zhang, Z. P., Zhilich, V., Zhulanov, V., and Zupanc, A. Fri . "Measurement of the τ Lepton Polarization and R(D*) in the Decay B¯→D*τ-ν¯τ". United States. https://doi.org/10.1103/PhysRevLett.118.211801. https://www.osti.gov/servlets/purl/1594359.
@article{osti_1594359,
title = {Measurement of the τ Lepton Polarization and R(D*) in the Decay B¯→D*τ-ν¯τ},
author = {Hirose, S. and Iijima, T. and Adachi, I. and Adamczyk, K. and Aihara, H. and Al Said, S. and Asner, D. M. and Atmacan, H. and Aulchenko, V. and Aushev, T. and Ayad, R. and Babu, V. and Badhrees, I. and Bakich, A. M. and Bansal, V. and Barberio, E. and Behera, P. and Berger, M. and Bhuyan, B. and Biswal, J. and Bondar, A. and Bonvicini, G. and Bozek, A. and Bračko, M. and Browder, T. E. and Červenkov, D. and Chang, P. and Chen, A. and Cheon, B. G. and Chilikin, K. and Chistov, R. and Cho, K. and Choi, Y. and Cinabro, D. and Danilov, M. and Dash, N. and Di Carlo, S. and Dingfelder, J. and Doležal, Z. and Drásal, Z. and Dutta, D. and Eidelman, S. and Epifanov, D. and Farhat, H. and Fast, J. E. and Ferber, T. and Fulsom, B. G. and Gaur, V. and Gabyshev, N. and Garmash, A. and Goldenzweig, P. and Golob, B. and Greenwald, D. and Grygier, J. and Haba, J. and Hara, K. and Hasenbusch, J. and Hayasaka, K. and Hayashii, H. and Higuchi, T. and Hou, W. -S. and Hsu, C. -L. and Inami, K. and Inguglia, G. and Ishikawa, A. and Itoh, R. and Iwasaki, Y. and Jacobs, W. W. and Jaegle, I. and Jin, Y. and Joffe, D. and Joo, K. K. and Julius, T. and Kato, Y. and Kawasaki, T. and Kichimi, H. and Kiesling, C. and Kim, D. Y. and Kim, J. B. and Kim, K. T. and Kim, M. J. and Kim, S. H. and Kinoshita, K. and Kodyš, P. and Korpar, S. and Kotchetkov, D. and Križan, P. and Krokovny, P. and Kuhr, T. and Kulasiri, R. and Kumar, R. and Kwon, Y. -J. and Lange, J. S. and Li, C. H. and Li, L. and Li, Y. and Li Gioi, L. and Libby, J. and Liventsev, D. and Lubej, M. and Luo, T. and MacNaughton, J. and Masuda, M. and Matsuda, T. and Matvienko, D. and Miyabayashi, K. and Miyake, H. and Miyata, H. and Mizuk, R. and Mohanty, G. B. and Moon, H. K. and Mori, T. and Mussa, R. and Nakao, M. and Nanut, T. and Nath, K. J. and Natkaniec, Z. and Nayak, M. and Niiyama, M. and Nisar, N. K. and Nishida, S. and Ogawa, S. and Okuno, S. and Ono, H. and Onuki, Y. and Ostrowicz, W. and Pakhlov, P. and Pakhlova, G. and Pal, B. and Park, C. W. and Park, H. and Paul, S. and Pesántez, L. and Pestotnik, R. and Piilonen, L. E. and Prasanth, K. and Ritter, M. and Rostomyan, A. and Rozanska, M. and Sakai, Y. and Sandilya, S. and Santelj, L. and Sanuki, T. and Sato, Y. and Savinov, V. and Schlüter, T. and Schneider, O. and Schnell, G. and Schwanda, C. and Seino, Y. and Senyo, K. and Seon, O. and Sevior, M. E. and Shebalin, V. and Shen, C. P. and Shibata, T. -A. and Shiu, J. -G. and Simon, F. and Sokolov, A. and Solovieva, E. and Starič, M. and Strube, J. F. and Sumisawa, K. and Sumiyoshi, T. and Takizawa, M. and Tamponi, U. and Tenchini, F. and Trabelsi, K. and Uchida, M. and Uglov, T. and Unno, Y. and Uno, S. and Urquijo, P. and Ushiroda, Y. and Usov, Y. and Van Hulse, C. and Varner, G. and Varvell, K. E. and Vossen, A. and Wang, C. H. and Wang, M. -Z. and Wang, P. and Watanabe, M. and Watanabe, Y. and Widmann, E. and Won, E. and Yamashita, Y. and Ye, H. and Yelton, J. and Yuan, C. Z. and Zhang, Z. P. and Zhilich, V. and Zhulanov, V. and Zupanc, A.},
abstractNote = {Here, we discuss the first measurement of the τ lepton polarization Pτ(D*) in the decay B¯→D*τ-ν¯τ as well as a new measurement of the ratio of the branching fractions R(D*)=B(B¯→D*τ-ν¯τ)/B(B¯→D*ℓ-ν¯ℓ), where ℓ- denotes an electron or a muon, and the τ is reconstructed in the modes τ-→π-ντ and τ-→ρ-ντ. We use the full data sample of 772×106BB¯ pairs recorded with the Belle detector at the KEKB electron-positron collider. Our findings, Pτ(D*)=-0.38±0.51(stat)-0.16+0.21(syst) and R(D*)=0.270±0.035(stat)-0.025+0.028(syst), are consistent with the theoretical predictions of the standard model.},
doi = {10.1103/PhysRevLett.118.211801},
journal = {Physical Review Letters},
number = 21,
volume = 118,
place = {United States},
year = {Fri May 26 00:00:00 EDT 2017},
month = {Fri May 26 00:00:00 EDT 2017}
}

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  • Journal of Physics G: Nuclear and Particle Physics, Vol. 46, Issue 2
  • DOI: 10.1088/1361-6471/aaf5de

Predictions of ${B}_{c}\, \rightarrow \,(D,D* )\tau \nu $ decay observables in the standard model and beyond
journal, February 2019


Prospects for exploring New Physics in Coherent Elastic Neutrino-Nucleus Scattering
journal, November 2018

  • Billard, Julien; Johnston, Joseph; Kavanagh, Bradley J.
  • Journal of Cosmology and Astroparticle Physics, Vol. 2018, Issue 11
  • DOI: 10.1088/1475-7516/2018/11/016

Phenomenology of $\,{{b\to c\tau\bar\nu }}\,$ decays in a scalar leptoquark model
journal, July 2019


Flavour anomalies: a review
journal, December 2018


B anomalies in the nonminimal universal extra dimension model
journal, October 2019


Probing new physics with B ¯ ρ ( 770 ) ν ¯ and B ¯ a 1 ( 1260 ) ν ¯
journal, October 2019


Charged current b c τ ν ¯ τ anomalies in a general W boson scenario
journal, November 2019


Investigation of effects of new physics in Λ b Λ c τ ν ¯ τ decay
journal, December 2019


Constraints on models of scalar and vector leptoquarks decaying to a quark and a neutrino at s = 13 TeV
journal, August 2018


Charged Higgs boson contribution to B q ν ¯ and B ¯ ( P , V ) ν ¯ in a generic two-Higgs doublet model
journal, November 2018


R -parity violating solutions to the R D ( * ) anomaly and their GUT-scale unifications
journal, January 2019


Muon g 2 in a U ( 1 ) -symmetric two-Higgs-doublet model
journal, February 2019


Constraining the minimal flavor violating leptoquark explanation of the R D ( * ) anomaly
journal, February 2019


Test of the R ( D ( * ) ) anomaly at the LHC
journal, April 2019


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


What is the scale of new physics behind the B-flavour anomalies?
journal, August 2017


Footprints of leptoquarks: from $$ R_{K^{(*)}} $$ R K ( ∗ ) to $$ K \rightarrow \pi \nu \bar{\nu }$$ K → π ν ν ¯
journal, March 2018


$$b \rightarrow c \tau \nu _{\tau }$$ b → c τ ν τ Decays: a catalogue to compare, constrain, and correlate new physics effects
journal, March 2019


b → cℓν anomalies in light of extended scalar sectors
journal, July 2019

  • Biswas, Aritra; Ghosh, Dilip Kumar; Patra, Sunando Kumar
  • International Journal of Modern Physics A, Vol. 34, Issue 21
  • DOI: 10.1142/s0217751x19501124

From the Trees to the Forest: A Review of Radiative Neutrino Mass Models
journal, December 2017


Hunting for scalar leptoquarks with boosted tops and light leptons
journal, October 2019


Lepton flavor universality violation in semileptonic tree level weak transitions
journal, June 2019


New physics in inclusive semileptonic B decays including nonperturbative corrections
journal, March 2019


Gauging the accidental symmetries of the standard model, and implications for the flavor anomalies
text, January 2020

  • Altmannshofer, Wolfgang; Davighi, Joseph; Nardecchia, Marco
  • Apollo - University of Cambridge Repository
  • DOI: 10.17863/cam.48521

Constraints on models of scalar and vector leptoquarks decaying to a quark and a neutrino at √s =13 TeV
text, January 2018


Impact of polarization observables and Bc→τν on new physics explanations of the b→cτν anomaly
text, January 2019

  • Blanke, Monika; Crivellin, Andreas; De Boer, Stefan
  • American Physical Society
  • DOI: 10.5167/uzh-174374

Measurement of the branching fraction of $B → D ^{(*)} π ℓ ν$ at Belle using hadronic tagging in fully reconstructed events
text, January 2018


Addendum to “Impact of polarization observables and Bc→τν on new physics explanations of the b→cτν anomaly”
text, January 2019

  • Blanke, Monika; Crivellin, Andreas; Kitahara, Teppei
  • American Physical Society
  • DOI: 10.5167/uzh-174367

Observation of the Leptonic Decay $D^+ → τ^+ ν_τ$
text, January 2019

  • Ablikim, M.; Achasov, M. N.; Adlarson, P.
  • GSI Helmholtzzentrum fuer Schwerionenforschung, GSI, Darmstadt
  • DOI: 10.15120/gsi-2020-00223

Measurement of the branching fraction of $B → D ^{(*)} π ℓ ν$ at Belle using hadronic tagging in fully reconstructed events
text, January 2018


$R_{D^{(*)}}$ anomaly: A possible hint for natural supersymmetry with $R$-parity violation
text, January 2017


What is the scale of new physics behind the $B$-flavour anomalies?
text, January 2017


From the trees to the forest: a review of radiative neutrino mass models
text, January 2017


Flavor Physics and Flavor Anomalies in Minimal Fundamental Partial Compositeness
text, January 2017


Prospects for exploring New Physics in Coherent Elastic Neutrino-Nucleus Scattering
text, January 2018


Flavour anomalies: a review
text, January 2018


Review of Lepton Universality tests in B decays
text, January 2018


Leptoquark solution for both the flavor and ANITA anomalies
text, January 2018


Gauge leptoquark as the origin of B-physics anomalies
text, January 2017

  • Di Luzio, Luca; Greljo, Admir; Nardecchia, Marco
  • American Physical Society
  • DOI: 10.5167/uzh-147225

Strong CP problem with low-energy emergent QCD: The 4321 case
text, January 2019

  • Fuentes-Martín, Javier; Reig, Mario; Vicente, Avelino
  • University of Zurich
  • DOI: 10.5167/uzh-179076