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9 results on '"D. A. Bryman"'

1. Improved Measurement of the π→eν Branching Ratio

Author

A, Aguilar-Arevalo, M, Aoki, M, Blecher, D I, Britton, D A, Bryman, D, Vom Bruch, S, Chen, J, Comfort, M, Ding, L, Doria, S, Cuen-Rochin, P, Gumplinger, A, Hussein, Y, Igarashi, S, Ito, S H, Kettell, L, Kurchaninov, L S, Littenberg, C, Malbrunot, R E, Mischke, T, Numao, D, Protopopescu, A, Sher, T, Sullivan, D, Vavilov, and K, Yamada

Abstract

A new measurement of the branching ratio R_{e/μ}=Γ(π^{+}→e^{+}ν+π^{+}→e^{+}νγ)/Γ(π^{+}→μ^{+}ν+π^{+}→μ^{+}νγ) resulted in R_{e/μ}^{exp}=[1.2344±0.0023(stat)±0.0019(syst)]×10^{-4}. This is in agreement with the standard model prediction and improves the test of electron-muon universality to the level of 0.1%.

Published
2015

2. Further Search for the DecayK+→π+νν¯

Author

S. Adler, M. S. Atiya, I-H. Chiang, M. V. Diwan, J. S. Frank, J. S. Haggerty, V. Jain, S. H. Kettell, T. F. Kycia, K. K. Li, L. S. Littenberg, C. Ng, R. C. Strand, C. Witzig, M. Kazumori, T. K. Komatsubara, M. Kuriki, N. Muramatsu, A. Otomo, S. Sugimoto, T. Inagaki, S. Kabe, M. Kobayashi, Y. Kuno, T. Sato, T. Shinkawa, Y. Yoshimura, Y. Kishi, T. Nakano, T. Sasaki, M. Ardebili, A. O. Bazarko, M. R. Convery, M. M. Ito, D. R. Marlow, R. A. McPherson, P. D. Meyers, F. C. Shoemaker, A. J. S. Smith, J. R. Stone, M. Aoki, P. C. Bergbusch, E. W. Blackmore, D. A. Bryman, A. Konaka, J. A. Macdonald, J. Mildenberger, T. Numao, P. Padley, J.-M. Poutissou, R. Poutissou, G. Redlinger, P. Kitching, and R. Soluk

Subjects
Physics, Antiparticle, Particle decay, Particle physics, Pion, Meson, Branching fraction, Hadron, General Physics and Astronomy, Neutrino, Lepton
Abstract

A search for additional evidence for the rare kaon decay K+-->pi(+)nunu; has been made with a new data set comparable in sensitivity to the previous exposure that produced a single event. No new events were found in the pion momentum region examined, 211 pi(+)nunu;) = 1.5(+3.4)(-1.2)x10(-10).

Published
2000
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3. PIENU experiment at TRIUMF: Measurement of π→eν∕π→μν branching ratio

Author

A. Sher, M. Aoki, M. Blecher, D. A. Bryman, J. Comfort, J. Doornbos, L. Doria, P. Gumplinger, A. Hussein, Y. Igarashi, N. Ito, S. Kettell, Y. Kuno, L. Kurchaninov, L. Littenberg, C. Malbrunot, G. Marshal, A. Muroi, R. Poutissou, A. Sandorfi, K. Yamada, and Marvin L. Marshak

Subjects
Physics, Nuclear physics, Particle physics, Muon, Pion, Meson, Branching fraction, Hadron, High Energy Physics::Experiment, Elementary particle, Dimensionless quantity, Lepton
Abstract

A TRIUMF experiment, PIENU, which aims to measure the branching ratio of pion decays, R = Γ(π→eν+eνγ)/Γ(π→μν+μνγ) to a precision of 0.1% or better is described. Such a measurement provides the best test of electron‐muon universality in weak interactions and is sensitive to an effective mass scale of up to 1000 TeV in new physics.A TRIUMF experiment, PIENU, which aims to measure the branching ratio of pion decays, R = Γ(π→eν+eνγ)/Γ(π→μν+μνγ) to a precision of 0.1% or better is described. Such a measurement provides the best test of electron‐muon universality in weak interactions and is sensitive to an effective mass scale of up to 1000 TeV in new physics.

Published
2009
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4. New measurement of the K+--pi+ nunu branching ratio

Author

A V, Artamonov, B, Bassalleck, B, Bhuyan, E W, Blackmore, D A, Bryman, S, Chen, I-H, Chiang, I-A, Christidi, P S, Cooper, M V, Diwan, J S, Frank, T, Fujiwara, J, Hu, J, Ives, D E, Jaffe, S, Kabe, S H, Kettell, M M, Khabibullin, A N, Khotjantsev, P, Kitching, M, Kobayashi, T K, Komatsubara, A, Konaka, A P, Kozhevnikov, Yu G, Kudenko, A, Kushnirenko, L G, Landsberg, B, Lewis, K K, Li, L S, Littenberg, J A, Macdonald, J, Mildenberger, O V, Mineev, M, Miyajima, K, Mizouchi, V A, Mukhin, N, Muramatsu, T, Nakano, M, Nomachi, T, Nomura, T, Numao, V F, Obraztsov, K, Omata, D I, Patalakha, S V, Petrenko, R, Poutissou, E J, Ramberg, G, Redlinger, T, Sato, T, Sekiguchi, T, Shinkawa, R C, Strand, S, Sugimoto, Y, Tamagawa, R, Tschirhart, T, Tsunemi, D V, Vavilov, B, Viren, Zhe, Wang, N V, Yershov, Y, Yoshimura, and T, Yoshioka

Abstract

Three events for the decay K+--pi+ nunu have been observed in the pion momentum region below the K+--pi+pi0 peak, 140Ppi199 MeV/c, with an estimated background of 0.93+/-0.17(stat.) -0.24+0.32(syst.) events. Combining this observation with previously reported results yields a branching ratio of B(K+--pi+ nunu) = (1.73(-1.05)+1.15) x 10(-10) consistent with the standard model prediction.

Published
2008

5. Improved measurement of the K+--pi+nunu; branching ratio

Author

V V, Anisimovsky, A V, Artamonov, B, Bassalleck, B, Bhuyan, E W, Blackmore, D A, Bryman, S, Chen, I-H, Chiang, I-A, Christidi, P S, Cooper, M V, Diwan, J S, Frank, T, Fujiwara, J, Hu, A P, Ivashkin, D E, Jaffe, S, Kabe, S H, Kettell, M M, Khabibullin, A N, Khotjantsev, P, Kitching, M, Kobayashi, T K, Komatsubara, A, Konaka, A P, Kozhevnikov, Yu G, Kudenko, A, Kushnirenko, L G, Landsberg, B, Lewis, K K, Li, L S, Littenberg, J A, Macdonald, J, Mildenberger, O V, Mineev, M, Miyajima, K, Mizouchi, V A, Mukhin, N, Muramatsu, T, Nakano, M, Nomachi, T, Nomura, T, Numao, V F, Obraztsov, K, Omata, D I, Patalakha, S V, Petrenko, R, Poutissou, E J, Ramberg, G, Redlinger, T, Sato, T, Sekiguchi, T, Shinkawa, R C, Strand, S, Sugimoto, Y, Tamagawa, R, Tschirhart, T, Tsunemi, D V, Vavilov, B, Viren, N V, Yershov, Y, Yoshimura, and T, Yoshioka

Abstract

An additional event near the upper kinematic limit for K+--pi(+)nunu; has been observed by experiment E949 at Brookhaven National Laboratory. Combining previously reported and new data, the branching ratio is B(K+--pi(+)nunu;)=(1.47(+1.30)(-0.89))x10(-10) based on three events observed in the pion momentum region 211P229 MeV/c. At the measured central value of the branching ratio, the additional event had a signal-to-background ratio of 0.9.

Published
2004

6. Erratum

Author

J. C. Seger, Ed J. Hendricks, Deborah B. Horn, Harold E. Bays, Wendy Scinta, W. McCarthy, L. A. Richardson, R. Lindquist, D. A. Bryman, S. L. Schmidt, Craig Primack, B. N. Sabowitz, and Eric C. Westman

Subjects
medicine.medical_specialty, Nutrition and Dietetics, business.industry, Endocrinology, Diabetes and Metabolism, Internal Medicine, medicine, Physical therapy, Cardiology and Cardiovascular Medicine, Intensive care medicine, medicine.disease, business, Obesity, Lipidology
Published
2014
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7. Further evidence for the decay K+ --pi+nu(nu)

Author

S, Adler, A O, Bazarko, P C, Bergbusch, E W, Blackmore, D A, Bryman, S, Chen, I-H, Chiang, M V, Diwan, J S, Frank, J S, Haggerty, J, Hu, T, Inagaki, M, Ito, V, Jain, S, Kabe, S H, Kettell, P, Kitching, M, Kobayashi, T K, Komatsubara, A, Konaka, Y, Kuno, M, Kuriki, K K, Li, L S, Littenberg, J A, Macdonald, P D, Meyers, J, Mildenberger, M, Miyajima, N, Muramatsu, T, Nakano, C, Ng, S, Ng, T, Numao, J-M, Poutissou, R, Poutissou, G, Redlinger, T, Sato, K, Shimada, T, Shimoyama, T, Shinkawa, F C, Shoemaker, J R, Stone, R C, Strand, S, Sugimoto, Y, Tamagawa, C, Witzig, and Y, Yoshimura

Abstract

Additional evidence for the rare kaon decay K+--pi+nu(nu) has been found in a new data set with comparable sensitivity to the previously reported result. One new event was observed in the pion momentum region examined, 211P229 MeV/c, bringing the total for the combined data set to two. Including all data taken, the backgrounds were estimated to contribute 0.15+/-0.05 events. The branching ratio is B(K+--pi+nu(nu)) = 1.57(+1.75)(-0.82)x10(-10).

Published
2001

8. Aspects of the Lepton Generation Puzzle

Author

D. A. Bryman

Subjects
Quark, Physics, Particle physics, Muon, Branching fraction, High Energy Physics::Phenomenology, Bibliography, High Energy Physics::Experiment, Elementary particle, Electron, Lepton number, Lepton
Abstract

The existence of multiple, seemingly redundant, generations of fundamental particles is one of the major puzzles facing particle physicists. There are at least three lepton generations or flavours, as depicted in Table I, which have in common a set of remarkable features. These include: 1) identical electromagnetic interactions, as evidenced by the spectacular agreement of experiments and theory on the values for electron and muon g-2,1 2) identical weak interactions embodied in tests of electronmuon universality in the branching ratio of π→eν/π→μν, 3) absence of strong interactions, 4) symmetry in the generation structure with the quark sector as required for the cancellation of anomalies,2 5) absence of flavour-changing interactions, such as μ →eγ, μ− +nucleus →e− +nucleus, K→μe and τ→μγ, and 6) existence of a conserved additive lepton number for each generation, as evidenced by searches for neutrinoless double-beta decay.

Published
1983
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9. Status of the PIENU experiment at TRIUMF.

Author

S Ito, A Aguilar-Arevalo, M Aoki, M Blecher, D I Britton, D A Bryman, D vom Bruch, S Chen, J Comfort, S Cuen-Rochin, L Doria, P Gumplinger, A Hussein, Y Igarashi, S Kettell, L Kurchaninov, L Littenberg, C Malbrunot, R E Mischke, and T Numao

Published
2015
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