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Your search keyword '"Miyazaki, Y."' showing total 12 results
Start Over Author "Miyazaki, Y." Topic leptons (nuclear physics)
12 results on '"Miyazaki, Y."'

1. Performance test of a lead-glass counter for the J-PARC E36 experiment.

Author

Miyazaki, Y., Shimizu, S., Bianchin, S., Djalali, C., Gill, D., Jiang, J., Hasinoff, M., Horie, K., Igarashi, Y., Imazato, J., Ivashkin, A., Kohl, M., Narikawa, R., Pywell, R., Strauch, S., Tabata, M., Toyoda, A., Yamazaki, H., and Yoshioka, T.

Subjects
*CRYSTAL glass, *PHYSICS experiments, *LEPTONS (Nuclear physics), *CHERENKOV counters, *MOMENTUM (Mechanics), *POLYETHYLENE
Abstract

The J-PARC E36 experiment will search for a violation of lepton universality by a precise measurement of the ratio of the kaon decay widths R K = Γ ( K + → e + ν ) / Γ ( K + → μ + ν ) . Charged particles will be identified by the combination of three independent systems: a lead-glass Cherenkov counter, an aerogel Cherenkov counter, and a time-of-flight measurement. The performance of the lead-glass Cherenkov counter was investigated with e + , μ + , and π + beams in the relevant momentum region from the K + decays. By using a polyethylene degrader to slow down the beam momentum in front of the lead-glass block, we succeeded in reducing the muon mis-identification probability down to 5% while maintaining a high e + detection efficiency of 98%. [ABSTRACT FROM AUTHOR]

Published
2015
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2. Search for lepton-flavor and lepton-number-violating decay modes

Author

Miyazaki, Y., Hayasaka, K., Adachi, I., Aihara, H., Asner, D.M., Aulchenko, V., Aushev, T., Bakich, A.M., Bay, A., Bhardwaj, V., Bhuyan, B., Bischofberger, M., Bozek, A., Bračko, M., Browder, T.E., Chang, M.-C., Chen, A., Chen, P., Cheon, B.G., and Chistov, R.

Subjects
*LEPTONS (Nuclear physics), *PARTICLE decays, *ACQUISITION of data, *NUCLEAR counters, *MESONS, *COLLIDERS (Nuclear physics), *ELECTRONS
Abstract

Abstract: We search for lepton-flavor and lepton-number-violating τ decays into a lepton (ℓ= electron or muon) and two charged mesons ( or ) using of data collected with the Belle detector at the KEKB asymmetric-energy collider. We obtain 90% confidence level upper limits on the branching fractions in the range . These results improve upon our previously published upper limits by factors of about 1.8 on average. [Copyright &y& Elsevier]

Published
2013
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3. Search for lepton-flavor-violating τ decays into a lepton and a vector meson

Author

Miyazaki, Y., Aihara, H., Arinstein, K., Aulchenko, V., Bakich, A.M., Balagura, V., Barberio, E., Bay, A., Belous, K., Bhardwaj, V., Bischofberger, M., Bondar, A., Bozek, A., Bračko, M., Browder, T.E., Chen, A., Chen, P., Cheon, B.G., Chiang, C.-C., and Cho, I.-S.

Subjects
*LEPTONS (Nuclear physics), *FLAVOR in particle physics, *CP violation, *RADIOACTIVE decay, *VECTOR mesons, *COLLIDERS (Nuclear physics), *BRANCHING ratios
Abstract

Abstract: We search for lepton-flavor-violating decays, where ℓ is an electron or muon and is one of the vector mesons , ϕ, ω, and . We use of data collected with the Belle detector at the KEKB asymmetric-energy collider. No evidence for a signal is found in any decay mode, and we obtain 90% confidence level upper limits on the individual branching fractions in the range . [Copyright &y& Elsevier]

Published
2011
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4. Search for lepton flavor violating decays into and

Author

Miyazaki, Y., Adachi, I., Aihara, H., Arinstein, K., Aulchenko, V., Bakich, A.M., Balagura, V., Barberio, E., Bay, A., Belous, K., Bischofberger, M., Bozek, A., Bračko, M., Browder, T.E., Chang, M.-C., Chang, P., Chen, A., Chen, K.-F., Chen, P., and Cheon, B.G.

Subjects
*LEPTONS (Nuclear physics), *FLAVOR in particle physics, *CP violation, *RADIOACTIVE decay, *COLLIDERS (Nuclear physics), *BRANCHING ratios, *OBSERVED confidence levels (Statistics)
Abstract

Abstract: We have searched for the lepton-flavor-violating decays and (), using a data sample of 671 fb−1 collected with the Belle detector at the KEKB asymmetric-energy collider. No evidence for a signal was found in any of the decay modes, and we set the following upper limits for the branching fractions: , , and at the 90% confidence level. [ABSTRACT FROM AUTHOR]

Published
2010
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5. Search for lepton flavor and lepton number violating τ decays into a lepton and two charged mesons

Author

Miyazaki, Y., Aihara, H., Arinstein, K., Aulchenko, V., Aushev, T., Bakich, A.M., Balagura, V., Barberio, E., Bay, A., Belous, K., Bhardwaj, V., Bischofberger, M., Bondar, A., Bračko, M., Browder, T.E., Chang, P., Chen, A., Cheon, B.G., Cho, I.-S., and Choi, Y.

Subjects
*LEPTONS (Nuclear physics), *FLAVOR in particle physics, *CP violation, *RADIOACTIVE decay, *PARTICLE accelerators, *COLLIDERS (Nuclear physics)
Abstract

Abstract: We search for lepton flavor and lepton number violating τ decays into a lepton ( or muon) and two charged mesons ( or ), and , using 671 fb−1 of data collected with the Belle detector at the KEKB asymmetric-energy collider. We obtain 90% C.L. upper limits on the branching fractions in the range for , and for processes. These results improve upon previously published upper limits by factors between 1.6 to 8.8. [Copyright &y& Elsevier]

Published
2010
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6. Search for lepton-flavor-violating τ decay into a lepton and an meson

Author

Miyazaki, Y., Adachi, I., Aihara, H., Arinstein, K., Aushev, T., Bakich, A.M., Bay, A., Bedny, I., Bitenc, U., Bondar, A., Bozek, A., Bračko, M., Browder, T.E., Chen, A., Cheon, B.G., Cho, I.-S., Choi, Y., Dalseno, J., Dash, M., and Drutskoy, A.

Subjects
*FLAVOR in particle physics, *RADIOACTIVE decay, *LEPTONS (Nuclear physics), *MESONS, *PHYSICS experiments, *NUCLEAR counters, *PARTICLE accelerators
Abstract

Abstract: We search for lepton-flavor-violating τ decays into a lepton (electron or muon) and an meson using 671 fb−1 of data collected with the Belle detector at the KEKB asymmetric-energy collider. No events are observed and we set the following 90% C.L. upper limits on the branching fraction products: and . This is the first search performed for these modes. [Copyright &y& Elsevier]

Published
2009
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7. Search for lepton flavor violating τ decays into three leptons

Author

Miyazaki, Y., Adachi, I., Aihara, H., Arinstein, K., Aulchenko, V., Aushev, T., Bakich, A.M., Balagura, V., Barberio, E., Bay, A., Bitenc, U., Bondar, A., Bozek, A., Bračko, M., Browder, T.E., Chen, A., Chen, K.-F., Chen, W.T., Cheon, B.G., and Chistov, R.

Subjects
*LEPTONS (Nuclear physics), *PARTICLES (Nuclear physics), *ENGINEERING instruments, *PHYSICS
Abstract

Abstract: We search for lepton flavor violating τ decays into three leptons (electron or muon) using 535 fb−1 of data collected with the Belle detector at the KEKB asymmetric-energy collider. No evidence for these decays is observed, and we set 90% confidence level upper limits on the branching fractions of . These results improve upon our previously published upper limits by factors of 4.9 to 10. [Copyright &y& Elsevier]

Published
2008
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8. Search for lepton flavor violating decays with a meson

Author

Miyazaki, Y., Abe, K., Aihara, H., Anipko, D., Arinstein, K., Aulchenko, V., Aushev, T., Bakich, A.M., Barbero, M., Bedny, I., Belous, K., Bitenc, U., Bizjak, I., Blyth, S., Bondar, A., Bozek, A., Bračko, M., Browder, T.E., Chen, A., and Chen, W.T.

Subjects
*LEPTONS (Nuclear physics), *PARTICLES (Nuclear physics), *NUCLEAR physics, *DETECTORS
Abstract

Abstract: We have searched for the lepton flavor violating decays ( or μ), using a data sample of 281 fb−1 collected with the Belle detector at the KEKB asymmetric-energy collider. No evidence for a signal was found in either of the decay modes, and we set the following upper limits for the branching fractions: and at the 90% confidence level. These results improve the previously published limits set by the CLEO Collaboration by factors of 16 and 19, respectively. [Copyright &y& Elsevier]

Published
2006
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9. Search for lepton and baryon number violating decays into and

Author

Miyazaki, Y., Abe, K., Adachi, I., Aihara, H., Arinstein, K., Asano, Y., Aulchenko, V., Aushev, T., Bahinipati, S., Bakich, A.M., Balagura, V., Barberio, E., Bedny, I., Bitenc, U., Bizjak, I., Blyth, S., Bondar, A., Bozek, A., Bračko, M., and Brodzicka, J.

Subjects
*LEPTONS (Nuclear physics), *BARYON number, *NUCLEAR physics, *BARYONS
Abstract

Abstract: We have searched for τ lepton decays, and , that simultaneously violate the conservation of the lepton (L) and baryon (B) number using a data sample of collected with the Belle detector at the KEKB asymmetric-energy collider. No evidence for a signal was found in either of the decay modes and we set the following upper limits for the branching fractions: and at the 90% confidence level. This is the first search ever performed for these modes. [Copyright &y& Elsevier]

Published
2006
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10. Search for Lepton Flavor Violating τ Decay at Belle

Author

Miyazaki, Y.

Subjects
*LEPTONS (Nuclear physics), *PARTICLE decays, *FLAVOR in particle physics, *PHYSICS experiments, *PARTICLE accelerators, *COLLIDERS (Nuclear physics), *BRANCHING ratios
Abstract

We review recent searches for lepton flavor violation in decays based on of data collected with the Belle detector at the KEKB asymmetric-energy collider. No evidence for these decays is observed and we set 90% confidence level upper limits on the branching fractions at the level. [Copyright &y& Elsevier]

Published
2009
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11. Search for Lepton and Baryon Number Violating Decays into , , , and

Author

Sato, N. and Miyazaki, Y.

Subjects
*RADIOACTIVE decay, *DECAY schemes (Radioactivity), *LEPTONS (Nuclear physics), *NUCLEAR physics
Abstract

We have searched for decays that violate both lepton and baryon number using data collected by the Belle detector at the KEKB asymmetric collider. No signals are found in , , , and and we set upper limits on the branching fractions of , , , and at the 90% confidence level. [Copyright &y& Elsevier]

Published
2005
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12. Search for lepton-flavor-violating τ decays into three leptons with 719 million produced pairs

Author

Hayasaka, K., Inami, K., Miyazaki, Y., Arinstein, K., Aulchenko, V., Aushev, T., Bakich, A.M., Bay, A., Belous, K., Bhardwaj, V., Bischofberger, M., Bozek, A., Bračko, M., Browder, T.E., Chang, M.-C., Chang, P., Chen, A., Chen, P., Cheon, B.G., and Chiang, C.-C.

Subjects
*RADIOACTIVE decay, *CP violation, *LEPTONS (Nuclear physics), *FLAVOR in particle physics, *COLLIDERS (Nuclear physics), *DETECTORS
Abstract

Abstract: We present a search for lepton-flavor-violating τ decays into three leptons (electrons or muons) using 782 fb−1 of data collected with the Belle detector at the KEKB asymmetric-energy collider. No evidence for these decays is observed and we set 90% confidence level upper limits on the branching fractions between and . [Copyright &y& Elsevier]

Published
2010
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