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Start Over Author "John N. Matthews" Publisher american physical society (aps)
14 results on '"John N. Matthews"'

1. Study of muons from ultrahigh energy cosmic ray air showers measured with the Telescope Array experiment

Author

S. Kitamura, Hidemi Ito, Kenta Yashiro, Eiji Kido, M. V. Kuznetsov, Kazuhiro Machida, Jyunsei Chiba, Dongsu Ryu, Y. Takagi, Douglas Bergman, Toshiyuki Nonaka, K. Nagasawa, Hideki Tanaka, Elliott Barcikowski, J. H. Kim, T. Goto, G. Furlich, Takaaki Ishii, Y. Omura, Keitaro Fujita, Dmitri Ivanov, Pierre Sokolsky, J. Ogura, Yasunori Saito, B. K. Shin, Igor Tkachev, D. C. Rodriguez, R. Sahara, M. Takeda, Shigehiro Nagataki, Keijiro Mukai, Yuichiro Tameda, John N. Matthews, Akimichi Taketa, Rasha Abbasi, H. Oda, K. Yamazaki, M. Yamamoto, L. M. Scott, Nobuyuki Sakurai, T. Suzawa, Y. Yoneda, N. Inoue, M. Ohnishi, Sergey Troitsky, J. Remington, Y. Hayashi, Inkyu Park, Federico R. Urban, S. Udo, C. C. H. Jui, Isaac Myers, Y. J. Kwon, Hideyuki Ohoka, K. Kawata, Ryota Onogi, Koichi Sekino, A. Di Matteo, K. H. Lee, S. B. Thomas, T.-A. Shibata, Naoaki Hayashida, Takayuki Tomida, Gordon Thomson, T. Matsuyama, S. Ozawa, R. Mayta, Hongsu Kim, Priti Shah, Tom Stroman, Robert Cady, Y. Zhezher, Grigory Rubtsov, Hideaki Shimodaira, Hyoming Jeong, Y. Takahashi, Mai Takamura, K. Kasahara, Y. Uchihori, Shoichi Kishigami, S. Yoshida, Naoto Sakaki, R. Azuma, Masaomi Ono, Tareq Abu-Zayyad, R. Yamane, Kiyoshi Tanaka, Motoki Hayashi, J. P. Lundquist, Shingo Kawana, William Hanlon, M. Allen, H. Kawai, T. Okuda, J. Yang, H. Tokuno, J. D. Smith, Daisuke Ikeda, S. R. Stratton, Tiffany Wong, R. Takeishi, T. Seki, Masaki Fukushima, Masato Takita, K. Martens, K. Tsutsumi, Peter Tinyakov, Samuel Blake, Shoichi Ogio, Zach Zundel, Fumiya Shibata, R. Ishimori, Toshitsugu Fujii, Oleg Kalashev, H. Yamaoka, Michiyuki Chikawa, Ryo Nakamura, Kazuo Saito, H. Yoshii, Heungsu Shin, Toru Nakamura, K. Hibino, Kenichi Kadota, BayarJon Paul Lubsandorzhiev, Mayuko Minamino, K. Honda, Yasunori Kitamura, Masaaki Tanaka, John Belz, Hiroyuki Sagawa, Ben Stokes, B. G. Cheon, S. Kawakami, Maxim Pshirkov, Akitoshi Oshima, Y. Tsunesada, M. Abe, Fumio Kakimoto, Vladim Kuzmin, and S. Jeong

Subjects
High Energy Astrophysical Phenomena (astro-ph.HE), Physics, Muon, COSMIC cancer database, Particle number, Physics::Instrumentation and Detectors, 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, Monte Carlo method, Hadron, FOS: Physical sciences, Cosmic ray, 01 natural sciences, law.invention, Telescope, Nuclear physics, Air shower, 13. Climate action, law, 0103 physical sciences, High Energy Physics::Experiment, Astrophysics - High Energy Astrophysical Phenomena, 010306 general physics
Abstract

One of the uncertainties in interpretation of ultra-high energy cosmic ray (UHECR) data comes from the hadronic interaction models used for air shower Monte Carlo (MC) simulations. The number of muons observed at the ground from UHECR-induced air showers is expected to depend upon the hadronic interaction model. One may therefore test the hadronic interaction models by comparing the measured number of muons with the MC prediction. In this paper, we present the results of studies of muon densities in UHE extensive air showers obtained by analyzing the signal of surface detector stations which should have high $\it{muon \, purity}$. The muon purity of a station will depend on both the inclination of the shower and the relative position of the station. In 7 years' data from the Telescope Array experiment, we find that the number of particles observed for signals with an expected muon purity of $\sim$65% at a lateral distance of 2000 m from the shower core is $1.72 \pm 0.10{\rm (stat.)} \pm 0.37 {\rm (syst.)}$ times larger than the MC prediction value using the QGSJET II-03 model for proton-induced showers. A similar effect is also seen in comparisons with other hadronic models such as QGSJET II-04, which shows a $1.67 \pm 0.10 \pm 0.36$ excess. We also studied the dependence of these excesses on lateral distances and found a slower decrease of the lateral distribution of muons in the data as compared to the MC, causing larger discrepancy at larger lateral distances.

Published
2018
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2. Publisher’s Note: Measurement of the proton-air cross section with Telescope Array’s Middle Drum detector and surface array in hybrid mode [Phys. Rev. D92, 032007 (2015)]

Author

Hideki Tanaka, K. Nagasawa, R. Zollinger, Hisono Tokuno, L. M. Scott, Pierre Sokolsky, A. Nozato, Y. Hayashi, M. Takeda, Shigehiro Nagataki, K. Kawata, K. Hibino, Hidemi Ito, P. Tinyakov, Mai Takamura, Dmitri Ivanov, Rasha Abbasi, M. Takita, Inkyu Park, Daisuke Ikeda, S. R. Stratton, O. Kalashev, B. G. Cheon, Akitoshi Oshima, Y. Tsunesada, Kalen Martens, R. W. Springer, Hideaki Shimodaira, Tiffany Wong, T. Goto, Charlie Jui, Ryuji Takeishi, Maxim Pshirkov, Sergey Troitsky, Mayuko Minamino, Yuichiro Tameda, K. Oki, K. Honda, Masaki Fukushima, Shunsuke Ozawa, Grigory Rubtsov, K. Yamazaki, T.-A. Shibata, Yasunori Kitamura, J. D. Smith, Takeshi Okuda, Vladim Kuzmin, Gordon Thomson, Igor Tkachev, Tom Stroman, H. Yoshii, Masaaki Tanaka, Robert Cady, Fumiya Shibata, Tomohiro Matsuda, Taka Tomida, Akimichi Taketa, R. Ishimori, M. Allen, S. B. Thomas, S. Kawakami, T. Matsuyama, Bokkyun Shin, John Belz, G. Vasiloff, Tareq Abu-Zayyad, R. Yamane, J. Ogura, Eiji Kido, Kazuhiro Machida, Elliott Barcikowski, M. J. Chae, Hiroyuki Sagawa, Shingo Kawana, K. Kadota, Jyunsei Chiba, Dongsu Ryu, D. R. Bergman, Naoaki Hayashida, Heungsu Shin, Y. Uchihori, William Hanlon, S. Yoshida, Y. J. Kwon, Toshitsugu Fujii, J. Yang, K. Kasahara, Nobuyuki Sakurai, Hideyuki Ohoka, John N. Matthews, Samuel Blake, Shoichi Ogio, Kiyoshi Tanaka, Fumio Kakimoto, Zach Zundel, M. Abe, Y. Yoneda, N. Inoue, S. I. Lim, Masaomi Ono, W. R. Cho, J. H. Kim, M. Ohnishi, Takaaki Ishii, Ben Stokes, Hongsu Kim, Federico R. Urban, D. C. Rodriguez, T. Suzawa, Toru Nakamura, H. Kawai, Isaac Myers, S. Kitamura, Kenta Yashiro, K. Tsutsumi, Priti Shah, Toshiyuki Nonaka, Michiyuki Chikawa, Y. Mukai, Hiroshi Yamaoka, Shigeharu Udo, R. Azuma, J. P. Lundquist, and J. Lan

Subjects
Physics, Surface (mathematics), Nuclear and High Energy Physics, Proton, business.industry, Detector, Drum, Astrophysics, Cosmology, law.invention, Gravitation, Telescope, Cross section (physics), Optics, law, business
Published
2015
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3. Upper limit on the flux of photons with energies above1019 eVusing the Telescope Array surface detector

Author

S. Kitamura, K. Kasahara, B. G. Cheon, John Belz, T. Shirahama, Y. Murano, T. Iguchi, X. Zhou, H. Kawai, Maxim Pshirkov, W. R. Cho, Fumiya Shibata, M. Tanaka, K. Nagasawa, Y. Yoneda, N. Inoue, S. I. Lim, M. Ohnishi, R. Ishimori, Y. Kondo, K. Martens, Hideki Tanaka, R. Azuma, T. Matsuura, A. L. Sampson, S. Udo, K. Oki, Yasuhiro H. Takahashi, H. Ukai, Priti Shah, Ben Stokes, K. Kuramoto, Grigory Rubtsov, Zach Zundel, M. Wood, Peter Tinyakov, Samuel Blake, L. M. Scott, H. Yoshii, S. B. Thomas, S. W. Nam, Shoichi Ogio, Toru Nakamura, Y. Uchihori, E. J. Cho, Y. Hayashi, S. Y. Roh, Nobuyuki Sakurai, Naoaki Hayashida, R. Zollinger, Kenichi Kadota, T. Kanbe, Michiyuki Chikawa, S. Iwamoto, S. Kawakami, Robert M. Anderson, J. H. Kim, S. Machida, Isaac Myers, S. Suzuki, Tomohiro Matsuda, Charlie Jui, J. Yang, K. Kitamoto, Inkyu Park, Yoshiki Tsunesada, Daisuke Ikeda, J. Lan, Hideaki Shimodaira, K. Kobayashi, Mayuko Minamino, K. Hayashi, S. R. Stratton, Douglas Bergman, Hiroyuki Sagawa, K. Honda, Toshiyuki Nonaka, Tiffany Wong, T. Fukuda, Masaki Fukushima, Yasunori Kitamura, T. Fujii, Vladim Kuzmin, R. Aida, Hiroshi Yamaoka, S. Yoshida, Fumio Kakimoto, Y. Wada, K. Hibino, D. Oku, Sergey Troitsky, K. Tsutsumi, J. I. Shin, K. Hiyama, K. Yamazaki, Takaaki Ishii, Taka Tomida, Tareq Abu-Zayyad, R. Yamane, T.-A. Shibata, Y. Yamakawa, Gordon Thomson, Elliott Barcikowski, Tom Stroman, Robert Cady, D. C. Rodriguez, Dmitri Ivanov, H. Fujii, G. Vasiloff, Akitoshi Oshima, Jyunsei Chiba, Dongsu Ryu, Masato Takita, Y. Tsuyuguchi, Igor Tkachev, Shunsuke Ozawa, Kiyoshi Tanaka, Hyun-Il Kim, T. Matsuyama, Hongsu Kim, Akimichi Taketa, M. Allen, Eiji Kido, Y. Kobayashi, Yuichiro Tameda, John N. Matthews, H. Tokuno, J. D. Smith, K. Miyata, Bokkyun Shin, Pierre Sokolsky, Y. J. Kwon, Hideyuki Ohoka, Shingo Kawana, K. Ikuta, M. Takeda, Shigehiro Nagataki, Dmitry Gorbunov, William Hanlon, T. Okuda, and O. Kalashev

Subjects
Physics, Surface (mathematics), Nuclear and High Energy Physics, Photon, 010308 nuclear & particles physics, Detector, Flux, Cosmic ray, Astrophysics, 01 natural sciences, law.invention, Telescope, law, 0103 physical sciences, Limit (mathematics), Atomic physics, 010306 general physics, Energy (signal processing)
Abstract

We search for ultra-high energy photons by analyzing geometrical properties of shower fronts of events registered by the Telescope Array surface detector. By making use of an event-by-event statistical method, we derive upper limits on the absolute flux of primary photons with energies above ${10}^{19}$, ${10}^{19.5}$, and ${10}^{20}\text{ }\text{ }\mathrm{eV}$ based on the first three years of data taken.

Published
2013
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4. Evidence for Changing of Cosmic Ray Composition between1017and1018eV from Multicomponent Measurements

Author

C. C. H. Jui, S. B. Thomas, K. D. Green, Konstantin Belov, Roger W Clay, M. A. K. Glasmacher, M. J. Kidd, K. M. Simpson, K. Gibbs, J. K. K. Tang, David Kieda, C. G. Larsen, D. Nitz, Joseph W. Fowler, X. Z. Zhang, D. Sinclair, S. Yoshida, Pierre Sokolsky, John N. Matthews, C. Song, B. C. Knapp, Z. Cao, Lucy Fortson, Y. Ho, J. C. van der Velde, A. Huang, J. D. Smith, E. C. Loh, J. W. Cronin, H. Y. Dai, Brian Fick, Paul Sommers, J. H. Boyer, Bruce R. Dawson, C. R. Wilkinson, John Matthews, Corbin Covault, J. W. Elbert, S. Ko, E. J. Mannel, Weonjong Lee, R. A. Ong, G. F. Chen, Lawrence Wiencke, M. Catanese, Tareq Abu-Zayyad, B. J. Newport, and D. J. Bird

Subjects
Nuclear physics, Physics, Muon, Physics::Instrumentation and Detectors, Scintillation counter, Detector, General Physics and Astronomy, High resolution, High Energy Physics::Experiment, Cosmic ray, Mass composition, Composition (combinatorics), Energy (signal processing)
Abstract

The average mass composition of cosmic rays with primary energies between ${10}^{17}$ and ${10}^{18}\mathrm{eV}$ has been studied using a hybrid detector consisting of the High Resolution Fly's Eye (HiRes) prototype and the MIA muon array. Measurements have been made of the change in the depth of shower maximum and the muon density as a function of energy. The results show that the composition is changing from a heavy to lighter mix as the energy increases.

Published
2000
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5. First Evidence for the DecayKL→e+e−μ+μ−

Author

Sunil Somalwar, A. Roodman, K. S. McFarland, Y. Zou, B. Winstein, Steve Schnetzer, Sun Kee Kim, M. Weaver, Elliott Cheu, S. S. Myung, P. Haas, T. Nakaya, P. Gu, K. Arisaka, T. Yamanaka, J. Enagonio, E. M. Collins, R. Coleman, Roland Winston, P. Krolak, B. Schwingenheuer, R. Ford, Vivian O'Dell, Gordon Thomson, M. B. Crisler, G. J. Bock, G. D. Gollin, W. P. Hogan, D. Roberts, E. J. Ramberg, R. Tschirhart, E. C. Swallow, M. B. Spencer, John N. Matthews, D. A. Jensen, D. A. Harris, W. E. Slater, Y. W. Wah, R. A. Briere, Y. B. Hsiung, and A. R. Barker

Subjects
Physics, Particle physics, Crystallography, Branching fraction, TheoryofComputation_ANALYSISOFALGORITHMSANDPROBLEMCOMPLEXITY, General Physics and Astronomy
Abstract

We present the first evidence for the decay {ital K}{sub {ital L}}{r_arrow}{ital e}{sup +}{ital e}{sup {minus}}{mu}{sup +}{mu}{sup {minus}} based on the observation of one event with an estimated background of 0.067{sub {minus}0.025}{sup +0.057} event. We determine the branching ratio to be {ital B}({ital K}{sub {ital L}}{r_arrow}{ital e}{sup +}{ital e}{sup {minus}}{mu}{sup +}{mu}{sup {minus}})=(2.9{sub {minus}2.4}{sup +6.7}){times}10{sup {minus}9}. In addition, we set a 90{percent} confidence upper limit on the combined branching ratio for the lepton flavor violating decays {ital K}{sub {ital L}}{r_arrow}{ital e}{sup {minus_plus}}{ital e}{sup {minus_plus}}{mu}{sup {plus_minus}}{mu}{sup {plus_minus}} to be {ital B}({ital K}{sub {ital L}}{r_arrow}{ital e}{sup {minus_plus}}{ital e}{sup {minus_plus}}{mu}{sup {plus_minus}}{mu}{sup {plus_minus}}){lt}6.1{times}10{sup {minus}9} assuming a uniform phase space distribution. {copyright} {ital 1996 The American Physical Society.}

Published
1996
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6. New Measurement of theCPViolation Parameterη+−γ

Author

Erik Ramberg, Sunil Somalwar, A. Roodman, R. Coleman, B. Winstein, Steve Schnetzer, S. S. Myung, T. Yamanaka, W. P. Hogan, E. M. Collins, B. Schwingenheuer, Gordon Thomson, E. C. Swallow, Sun Kee Kim, John N. Matthews, J. Enagonio, Elliott Cheu, G. Makoff, M. B. Crisler, P. Haas, G. D. Gollin, D. A. Harris, R. A. Briere, Roland Winston, R. Ford, Y. B. Hsiung, R. Tschirhart, A. R. Barker, K. S. McFarland, Y. W. Wah, D. A. Jensen, G. J. Bock, P. Gu, and Y. Zou

Subjects
Physics, Crystallography, Degree (graph theory), General Physics and Astronomy, CP violation, High Energy Physics::Experiment, Nuclear Experiment
Abstract

We have measured the {ital CP} violation parameter {eta}{sub +{minus}{gamma}} in a neutral kaon experiment, E773, at Fermilab. This parameter characterizes {ital CP} violation in the decay {ital K}{sub {ital L}}{r_arrow}{pi}{sup +}{pi}{sup {minus}}{gamma}. Kaon decays into {pi}{sup +}{pi}{sup {minus}} collected simultaneously were used for normalization. Our result is {vert_bar}{eta}{sub +{minus}{gamma}}{vert_bar}=[2.359 {plus_minus} 0.062(stat) {plus_minus} 0.040(syst)] {times} 10{sup {minus}3} with a phase {phi}{sub +{minus}{gamma}} = [43.8 {plus_minus} 3.5(stat) {times} 1.9(syst){degree}]. The prediction that {eta}{sub +{minus}{gamma}} should be very close to {eta}{sub +{minus}} is supported by our result.

Published
1995
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7. Measurement of the Branching Ratio and Form Factor ofKL→μ+μ−γ

Author

Roland Winston, R. Ford, Y. W. Wah, Sun Kee Kim, K. S. McFarland, R. A. Briere, D. Roberts, John N. Matthews, Y. B. Hsiung, P. Haas, M. B. Crisler, R. Coleman, Steve Schnetzer, Tatsuhiko Yamanaka, Erik Ramberg, W. E. Slater, Sunil Somalwar, W. P. Hogan, A. R. Barker, Elliott Cheu, R. Tschirhart, E. M. Collins, M. B. Spencer, E. C. Swallow, Gordon Thomson, P. Krolak, T. Nakaya, B. Winstein, M. Weaver, S. S. Myung, J. Enagonio, B. Schwingenheuer, George D Gollin, K. Arisaka, G. J. Bock, D. A. Jensen, A. Roodman, D. A. Harris, Y. Zou, and P. Gu

Subjects
Physics, Crystallography, Branching fraction, TheoryofComputation_ANALYSISOFALGORITHMSANDPROBLEMCOMPLEXITY, Form factor (quantum field theory), Gamma ray, General Physics and Astronomy
Abstract

We report on a measurement of the decay {ital K}{sub {ital L}}{r_arrow}{mu}{sup +}{mu}{sup {minus}}{gamma} from Fermilab experiment E799. We observe 207 candidate signal events with an estimated background of 10.5{plus_minus}4.0 events and establish {ital B}({ital K}{sub {ital L}}{r_arrow}{mu}{sup +}{mu}{sup {minus}}{gamma})=[3.23{plus_minus}0.23(stat){plus_minus}0.19(syst)]{times}10{sup {minus}7}. This provides the first measurement of the {ital K}{gamma}{gamma}{sup *} form factor in the muonic Dalitz decay mode of the {ital K}{sub {ital L}}.

Published
1995
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8. Search for the decayKL0→π0π0γ

Author

B. Winstein, J. Kubic, D. A. Jensen, S. S. Myung, Erik Ramberg, Y. W. Wah, Y. Zou, R. Coleman, K. S. McFarland, Steve Schnetzer, A. R. Barker, Sunil Somalwar, E. M. Collins, William Slater, John N. Matthews, T. Nakaya, R. Tschirhart, Sun Kee Kim, J. Enagonio, D. A. Harris, K. Arisaka, P. Haas, Roland Winston, R. Ford, W. P. Hogan, George D Gollin, Elliott Cheu, B. Schwingenheuer, P. Gu, A. Roodman, D. Roberts, M. B. Crisler, M. Weaver, G. J. Bock, Gordon Thomson, Tatsuhiko Yamanaka, E. C. Swallow, R. A. Briere, and Y. B. Hsiung

Subjects
Combinatorics, Physics, Particle decay, Chiral symmetry, Branching fraction, TheoryofComputation_ANALYSISOFALGORITHMSANDPROBLEMCOMPLEXITY, Radiative decay
Abstract

We report the results of a search for the decay [ital K][sub [ital L]][sup 0][r arrow][pi][sup 0][pi][sup 0][gamma] conducted by the E799 Collaboration at Fermilab. The amplitude for this process vanishes to [ital O]([ital p][sup 4]) in chiral perturbation theory, so a measurement of the decay would directly probe [ital O]([ital p][sup 6]) effects. This is the first published search for this decay mode and we set a 90% confidence level upper limit on the branching ratio of [ital B]([ital K][sub [ital L]][sup 0][r arrow][pi][sup 0][pi][sup 0][gamma])[lt]2.3[times]10[sup [minus]4].

Published
1994
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9. Limit on the Branching Ratio ofKL→π0νν¯

Author

P. Haas, W. P. Hogan, Sun Kee Kim, M. B. Crisler, T. Nakaya, D. A. Jensen, A. Roodman, P. Gu, G. D. Gollin, J. Enagonio, B. Winstein, M. Weaver, D. A. Harris, W. E. Slater, A. R. Barker, Gordon Thomson, S. S. Myung, John N. Matthews, R. Coleman, Steve Schnetzer, E. J. Ramberg, Y. W. Wah, E. M. Collins, K. Arisaka, Y. Zou, G. J. Bock, E. C. Swallow, B. Schwingenheuer, R. Tschirhart, D. A. Roberts, Roland Winston, R. A. Briere, R. Ford, Y. B. Hsiung, Elliott Cheu, S. Somalwar, Kevin Scott McFarland, and T. Yamanaka

Subjects
Physics, Particle physics, Branching fraction, General Physics and Astronomy, CP violation, Limit (mathematics), Neutrino
Published
1994
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10. Measurement of the branching ratio and a study ofCPfor the leptonic decayKL→e+e−e+e−

Author

D. Roberts, G. J. Bock, M. B. Crisler, P. Gu, T. Nakaya, B. Winstein, A. R. Barker, John N. Matthews, S. S. Myung, D. A. Jensen, R. Tschirhart, K. S. McFarland, R. Coleman, E. C. Swallow, J. Enagonio, R. A. Briere, E. M. Collins, Y. B. Hsiung, Tatsuhiko Yamanaka, M. Weaver, Gordon Thomson, Roland Winston, B. Schwingenheuer, Erik Ramberg, Steve Schnetzer, Y. Zou, William Slater, W. P. Hogan, Elliott Cheu, A. Roodman, George D Gollin, Sun Kee Kim, R. Ford, D. A. Harris, P. Haas, K. Arisaka, Sunil Somalwar, and Y. W. Wah

Subjects
Combinatorics, Physics, Nuclear physics, Angular distribution, Branching fraction, TheoryofComputation_ANALYSISOFALGORITHMSANDPROBLEMCOMPLEXITY, General Physics and Astronomy, MathematicsofComputing_DISCRETEMATHEMATICS
Abstract

We have determined the branching ratio of [ital K][sub [ital L]][r arrow][ital e][sup +][ital e][sup [minus]][ital e][sup +][ital e][sup [minus]] based on the observation of 27 four-electron final state events with 0.36 estimated background event, [ital B]([ital K][sub [ital L]][r arrow][ital e][sup +][ital e][sup [minus]][ital e][sup +][ital e][sup [minus]]) =[3.96[plus minus]0.78(stat)[plus minus]0.32(syst)][times]10[sup [minus]8]. Using the distribution of the angle between the [ital e][sup +][ital e][sup [minus]] pair decay planes, we find that the decay proceeds predominantly through the [ital K][sub 2]([ital CP]=[minus]1) state.

Published
1994
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11. Limit on the branching ratio ofKL→π0e+e−

Author

Y. W. Wah, E. M. Collins, Sunil Somalwar, B. Winstein, D. A. Jensen, K. Arisaka, W. P. Hogan, T. Yamanaka, S. S. Myung, Sun Kee Kim, Gordon Thomson, P. Haas, Y. Zou, J. Enagonio, R. Tschirhart, Elliott Cheu, T. Nakaya, W. E. Slater, Steve Schnetzer, John N. Matthews, M. B. Crisler, D. A. Harris, Roland Winston, R. Ford, G. D. Gollin, R. Coleman, D. Roberts, A. R. Barker, M. Weaver, E. J. Ramberg, E. C. Swallow, G. J. Bock, P. Gu, G. Makoff, R. A. Briere, Y. B. Hsiung, B. Schwingenheuer, A. Roodman, and K. S. McFarland

Subjects
Combinatorics, Semileptonic decay, Physics, Particle decay, Muon, Branching fraction, General Physics and Astronomy, CP violation
Abstract

We report the results of a search for the decay [ital K][sub [ital L]][r arrow][pi][sup 0][ital e+][ital e[minus]] conducted by E799 at Fermilab. The largest contribution to this decay mode is expected to be [ital CP] violating. Observations of this decay could either confirm the standard model mechanisms for [ital CP] violation or point to physics beyond the standard model. No such events were seen in our search. The 90% confidence level upper limit is determined to be [ital B]([ital K][sub [ital L]][r arrow][pi][sup 0][ital e+][ital e[minus]])[lt]4.3[times]10[sup [minus]9].

Published
1993
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12. Limit on the branching ratio ofKL→π0μ+μ−

Author

Steve Schnetzer, J. Enagonio, Roland Winston, E. M. Collins, K. Arisaka, John N. Matthews, M. B. Crisler, W. P. Hogan, A. R. Barker, B. Schwingenheuer, G. D. Gollin, Sun Kee Kim, T. Yamanaka, R. A. Briere, Y. W. Wah, M. Weaver, A. Roodman, P. Haas, B. Winstein, R. Tschirhart, Y. Zou, G. J. Bock, Elliott Cheu, T. Nakaya, W. E. Slater, D. A. Roberts, S. S. Myung, G. Makoff, R. Coleman, P. Gu, E. J. Ramberg, S. Somalwar, E. C. Swallow, R. Ford, Y. B. Hsiung, Gordon Thomson, K. S. McFarland, D. A. Jensen, and D. A. Harris

Subjects
Semileptonic decay, Combinatorics, Physics, Particle physics, Particle decay, Muon, Meson, Branching fraction, TheoryofComputation_ANALYSISOFALGORITHMSANDPROBLEMCOMPLEXITY, Pi, General Physics and Astronomy, CP violation, Micro/Micro
Abstract

We report the results of a search for the decay [ital K][sub [ital L]][r arrow][pi][sup 0][mu][sup +][mu][sup [minus]] conducted by E799 at Fermilab. This decay mode is expected to have significant [ital CP][minus]violating contributions and a direct measurement could either confirm the standard model mechanisms for [ital CP]-violation or point to physics beyond the standard model. No such events were seen. The 90% confidence level upper limit is determined to be [ital B]([ital K][sub [ital L]][r arrow][pi][sup 0][mu][sup +][mu][sup [minus]])[lt]5.1[times]10[sup [minus]9].

Published
1993
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13. Measurement of the branching ratio ofπ0→e+e−fromπ0’s produced byKL→π0π0π0decays in flight

Author

E. M. Collins, A. Roodman, M. Weaver, D. Roberts, D. A. Jensen, W. P. Hogan, B. Winstein, A. R. Barker, M. B. Crisler, Elliott Cheu, R. Tschirhart, S. S. Myung, K. S. McFarland, Steve Schnetzer, G. D. Gollin, T. Nakaya, Y. W. Wah, Sun Kee Kim, W. E. Slater, G. Makoff, R. Coleman, P. Haas, J. Enagonio, R. A. Briere, Roland Winston, K. Arisaka, R. Ford, Y. B. Hsiung, D. A. Harris, B. Schwingenheuer, Y. Zou, John N. Matthews, E. J. Ramberg, E. C. Swallow, T. Yamanaka, G. J. Bock, P. Gu, Gordon Thomson, and Sunil Somalwar

Subjects
Combinatorics, Physics, Semileptonic decay, Statistics::Theory, Measurement method, Statistics::Applications, Branching fraction, Pi, General Physics and Astronomy, High Energy Physics::Experiment, Elementary particle
Abstract

The Fermilab E799 Collaboration has carried out a search for the rare decay ${\mathrm{\ensuremath{\pi}}}^{0}$\ensuremath{\rightarrow}${\mathit{e}}^{+}$${\mathit{e}}^{\mathrm{\ensuremath{-}}}$ using ${\mathrm{\ensuremath{\pi}}}^{0}$'s produced from ${\mathit{K}}_{\mathit{L}}$\ensuremath{\rightarrow}${\mathrm{\ensuremath{\pi}}}^{0}$${\mathrm{\ensuremath{\pi}}}^{0}$${\mathrm{\ensuremath{\pi}}}^{0}$ decays in flight. We observe a signal of nine events with an ${\mathit{e}}^{+}$${\mathit{e}}^{\mathrm{\ensuremath{-}}}$ mass close to the ${\mathrm{\ensuremath{\pi}}}^{0}$ mass where only one event is predicted from other known processes. From this, we measure B(${\mathrm{\ensuremath{\pi}}}^{0}$\ensuremath{\rightarrow}${\mathit{e}}^{+}$${\mathit{e}}^{\mathrm{\ensuremath{-}}}$,(${\mathit{m}}_{\mathit{e}\mathit{e}}$/${\mathit{m}}_{\mathrm{\ensuremath{\pi}}}^{0}$${)}^{2}$\ensuremath{\gtrsim}0.95) =[7.${6}_{\mathrm{\ensuremath{-}}2.8}^{+3.9}$(stat)\ifmmode\pm\else\textpm\fi{}0.5(syst)]\ifmmode\times\else\texttimes\fi{}${10}^{\mathrm{\ensuremath{-}}8}$, over and above the contribution from ${\mathrm{\ensuremath{\pi}}}^{0}$ Dalitz decays. Correcting for radiative effects, we find this result consistent with theoretical expectations from standard-model processes.

Published
1993
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14. Publisher’s Note: Indications of Proton-Dominated Cosmic-Ray Composition above 1.6 EeV [Phys. Rev. Lett.104, 161101 (2010)]

Author

John Belz, Dmitri Ivanov, M. M. Maestas, L. J. Marek, D. R. Bergman, W. Deng, G. W. Burt, A. O’Neill, Rasha Abbasi, Gareth Hughes, J. P. Lundquist, Naruo Sasaki, K. Martens, Tareq Abu-Zayyad, M. A. Kirn, Steve Schnetzer, Dale Tupa, Samuel Blake, L. Perera, J. Liu, M. Allen, A. Zech, William Hanlon, John N. Matthews, S. R. Stratton, L. M. Scott, N. Manago, Ben Stokes, Gordon Thomson, B. F. Jones, J. A.J. Matthews, G. Archbold, J. F. Amman, Konstantin Belov, J. D. Smith, E. C. Loh, C. Song, Xiang Zhang, M. D. Roberts, C. A. Painter, Z. Cao, Kevin Reil, J. R. Thomas, S. A. Moore, Michael H. Holzscheiter, Ross Anderson, Pierre Sokolsky, M. Al-Seady, R. W. Springer, C. M. Hoffman, G. Sinnis, R. Riehle, Y. Fedorova, C. C. H. Jui, D. C. Rodriguez, S. B. Thomas, K. Kim, C. Cannon, O. A. Brusova, P. Hüntemeyer, C. B. Finley, and R. C. Gray

Subjects
Physics, Nuclear physics, Proton, General Physics and Astronomy, Cosmic ray, Astrophysics
Published
2010
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