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18 results on '"A.R. Barker"'

4. Search for the decay K→πν

Author

J. Adams, A. Alavi-Harati, I.F. Albuquerque, T. Alexopoulos, M. Arenton, K. Arisaka, S. Averitte, A.R. Barker, L. Bellantoni, A. Bellavance, J. Belz, R. Ben-David, D.R. Bergman, E. Blucher, G.J. Bock, C. Bown, S. Bright, E. Cheu, S. Childress, R. Coleman, M.D. Corcoran, G. Corti, B. Cox, M.B. Crisler, A.R. Erwin, S. Field, R. Ford, G. Graham, J. Graham, K. Hagan, E. Halkiadakis, K. Hanagaki, M. Hazumi, S. Hidaka, Y.B. Hsiung, V. Jejer, J. Jennings, D.A. Jensen, P.T. Johnson, R. Kessler, H.G.E. Kobrak, J. LaDue, A. Lath, A. Ledovskoy, A.P. McManus, P. Mikelsons, S. Mochida, E. Monnier, T. Nakaya, U. Nauenberg, K.S. Nelson, H. Nguyen, V. O'Dell, M. Pang, R. Pordes, V. Prasad, C. Qiao, B. Quinn, E.J. Ramberg, R.E. Ray, A. Ronzhin, A. Roodman, M. Sadamoto, S. Schnetzer, K. Senyo, P. Shanahan, P.S. Shawhan, W. Slater, N. Solomey, S.V. Somalwar, R.L. Stone, I. Suzuki, E.C. Swallow, R.A. Swanson, S.A. Taegar, R.J. Tesarek, G.B. Thomson, P.A. Toale, A. Tripathi, R. Tschirhart, Y.W. Wah, H.B. White, J. Whitmore, B. Winstein, R. Winston, J.-Y. Wu, T. Yamanaka, and E.D. Zimmerman

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Branching fraction, Pi, Limit (mathematics), Fermilab, Event (particle physics)
Abstract

We report on a search for the rare decay K_L -> pi^0 nu nubar in the KTeV experiment at Fermilab. We searched for two-photon events whose kinematics were consistent with an isolated pi^0 coming from the decay K_L -> pi^0 nu nubar. One candidate event was observed, which was consistent with the expected level of background. An upper limit on the branching ratio was determined to be B(K_L -> pi^0 nu nubar) < 1.6E-6 at the 90% confidence level.

Published
1999

5. KTeV: New experiments to measure and rare kaon decays at fermilab

Author

A.R. Barker

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Data quality, Measure (physics), Phase (waves), Fermilab, Atomic and Molecular Physics, and Optics, Standard Model
Abstract

The KTeV Project includes two new fixed-target kaon experiments at Fermilab, E-832 and E-799 Phase II, which will use almost the same apparatus. E-832 will perform a new measurement of ϵ′ϵ, with a goal of 10−4 accuracy, while E-799 Phase II will search for rare KL decays of the form KL → π0ll, which have important direct-CP-violating contributions in the Standard Model. The KTeV apparatus is described, and the status of the project is presented. Some initial indications of data quality are given.

Published
1997

6. KAON PHYSICS: EXPERIMENTS

Author

A.R. Barker

Subjects
Nuclear physics, Physics, Unitarity, CP violation, Fermilab
Published
2001

7. Development of fibre channel disk clusters. Final report for period September 2, 1998 - March 17, 1999

Author

A.M. Yacout, T.D. Stockert, A.R. Barker, J.R. Justice, and W.L. Dunn

Subjects
File system, Workstation, business.industry, Computer science, computer.software_genre, law.invention, Fibre Channel, File locking, law, Computer data storage, Cluster (physics), Operating system, Routing (electronic design automation), business, computer, Computer hardware, Data transmission
Abstract

This report documents the accomplishments of a Phase I project whose purpose was to demonstrate feasibility of developing inexpensive and fast data storage using multi-host Fibre Channel disk clusters. In Phase I, a working file system called ZFS was developed and tested. The ZFS approach was designed to be suited for high energy physics applications, but is general and flexible enough to be useful for other high-volume applications. The ZFS approach, which borrows from the networking concept of cut-through routing, uses Linux boxes and disk clusters in a Fibre Channel--Arbitrated Loop architecture. In ZFS, file locking and other meta-data level operations are carried out over the primary data network, after which all data are sent directly over a Fibre Channel between the workstation and the disk cluster. No intermediate server is required. Substantially higher throughputs than in traditional networked disk architectures have been demonstrated. The ZFS architecture is described and tests of the first implementation of ZFS at Fermilab are discussed. The current system is implemented for Linux and is being optimized for Fermilab's needs, but extensions to other operating systems and other data-intensive applications are clearly foreseen.

Published
1999

8. Influence of clinical mastitis during early lactation on reproductive performance of Jersey cows

Author

A.R. Barker, F. N. Schrick, M. J. Lewis, H.H. Dowlen, and Stephen P. Oliver

Subjects
medicine.medical_specialty, medicine.medical_treatment, media_common.quotation_subject, Insemination, Animal science, Pregnancy, Lactation, Streptococcal Infections, Calving interval, Genetics, medicine, Animals, Mastitis, Bovine, Escherichia coli Infections, Insemination, Artificial, media_common, Gynecology, business.industry, Artificial insemination, food and beverages, Milk production, medicine.disease, Mastitis, medicine.anatomical_structure, Fertilization, Animal Science and Zoology, Cattle, Female, Seasons, Reproduction, business, Food Science
Abstract

The purpose of this study was to determine the influence of clinical mastitis on reproductive performance of high producing Jersey cows. Cows (n = 102) with clinical mastitis during the first 150 d of lactation were evaluated. Groups were balanced according to lactation number and days of lactation and sub-divided as follows: group 1, clinical mastitis before first artificial insemination (AI) (n = 48); group 2, clinical mastitis between first AI and pregnancy (n = 14); group 3, clinical mastitis after confirmed pregnancy (n = 40); and group 4, control cows (n = 103) with no clinical mastitis. No differences in reproductive performance were detected because of milk production or mastitis caused by Gram-positive or Gram-negative pathogens. The number of days to first AI was significantly greater for cows with clinical mastitis before first AI (93.6 d) than for all other groups (71.0 d). Artificial inseminations per conception were significantly greater for cows with clinical mastitis after first AI (2.9) than for cows with clinical mastitis before first AI (1.6), cows with no clinical mastitis, or cows with clinical mastitis after confirmed pregnancy (1.7). The number of days to conception for cows with clinical mastitis after first AI (136.6 d) was significantly greater than that for control cows and that for cows that developed clinical mastitis after confirmed pregnancy (92.1 d). Clinical mastitis during early lactation markedly influenced reproductive performance of Jersey cows.

Published
1998

9. Elementary particle physics and high energy phenomena. Final technical report

Author

U. Nauenberg, P. Rankin, Thomas DeGrand, William T. Ford, James G. Smith, A.R. Barker, K.T. Mahanthappa, John Perry Cumalat, and S.P. de Alwis

Subjects
Physics, Nuclear physics, Particle physics, Particle decay, law, Detector, Hadron, CP violation, Particle accelerator, Elementary particle, Particle detector, Linear particle accelerator, law.invention
Abstract

This report covers progress made by Experimental Group 1 (Task A1). Brief summaries are given for the research in each of the following areas: (1) study of the properties of the Z{sup 0} with the SLD detector; (2) the KTeV project: studies of CP violation; (4) detector development activities; (5) the B-Factory program; and (6) the NLC program.

Published
1996

10. Elementary particle physics and high energy phenomena. [Dept. of Physics, Univ. of Colorado, Boulder, Colorado]

Author

A.R. Barker, K.T. Mahanthappa, P. Rankin, John Perry Cumalat, James G. Smith, Thomas DeGrand, U. Nauenberg, William T. Ford, and S.P. de Alwis

Subjects
Quantum chromodynamics, Nuclear physics, Physics, Particle physics, Particle decay, Pion, Muon, Physics::Instrumentation and Detectors, Hadron, High Energy Physics::Experiment, Elementary particle, Lattice QCD, Particle detector
Abstract

Experimental and theoretical high-energy physics programs at the University of Colorado are reported. Areas of concentration include the following: study of the properties of the Z[sup 0] with the SLD detector; fixed-target K-decay experiments; the R D program for the muon system: the SDC detector; high-energy photoproduction of states containing heavy quarks; electron--positron physics with the CLEO II detector at CESR; lattice QCD; and spin models and dynamically triangulated random surfaces. 24 figs., 2 tabs., 117 refs.

Published
1992

11. Elementary particle physics and high energy phenomena. Progress report for FY92

Author

John Perry Cumalat, A.R. Barker, James G. Smith, U. Nauenberg, Thomas DeGrand, K.T. Mahanthappa, P. Rankin, William T. Ford, and S.P. de Alwis

Subjects
Quark, Nuclear physics, Physics, High energy, Particle physics, Physics::Instrumentation and Detectors, High Energy Physics::Phenomenology, Detector, High Energy Physics::Experiment, Elementary particle physics, Muon detector, Boson
Abstract

This report discusses the following research in high energy physics: the properties of the z neutral boson with the SLD detector; the research and development program for the SDC muon detector; the fixed-target k-decay experiments; the Rocky Mountain Consortium for HEP; high energy photoproduction of states containing heavy quarks; and electron-positron physics with the CLEO II and Mark II detectors. (LSP).

Published
1992

13. Elementary particle physics and high energy phenomena

Author

K.T. Mahanthappa, J. G. Smith, U. Nauenberg, P. Rankin, A.R. Barker, William T. Ford, John Perry Cumalat, Thomas DeGrand, and S. P. Dealwis

Subjects
Nuclear physics, Quantum chromodynamics, Quark, Physics, Particle decay, Muon, Hadron, Elementary particle, Electron, Particle detector
Published
1992

14. Corrigendum to 'Homotypic variation of canine flexor tendons: implications for the design of experimental studies in animal models'

Author

E.L. Abreu, E. Mascha, A.R. Barker, and Kathleen A. Derwin

Subjects
Engineering, Veterinary medicine, Flexor tendon, business.industry, Rehabilitation, Biomedical Engineering, Biophysics, Orthopedics and Sports Medicine, Anatomy, business
Abstract

Corrigendum to ‘‘Homotypic variation of canine flexor tendons: implications for the design of experimental studies in animal models’’ [J. Biomech. 37 (2004) 959–968] A.R. Barker, E.L. Abreu, E. Mascha, K.A. Derwin Department of Biomedical Engineering and the Orthopeadic Research Center, Lerner Research Institute, The Cleveland Clinic Fountation, 9500 Euclid Avenue, Cleveland, OH 44195-5254, USA Department of Biostatistics and Epidemology, The Cleveland Clinic Fountation, 9500 Euclid Avenue, Cleveland, OH 44195-5254, USA www.JBiomech

Published
2004

15. Study of baryon correlations ine+e−annihilation at 29 GeV

Author

A. Lu, Peter Nemethy, J. S. Steinman, J. E. Huth, B. C. Shen, S. Toutounchi, T. Kamae, L. Mathis, R. R. McNeil, A. Barbaro-Galtieri, R. R. van Daalen Wetters, B. A. Barnett, R. Lander, Kaori Maeshima, C. D. Buchanan, S. C. Loken, E. M. Wang, D. E. Pellet, Margaret Alston-Garnjost, R. van Tyen, W. G.J. Langeveld, H. U. Bengtsson, B. van Uitert, G. E. Masek, E. S. Miller, X. Q. Lu, K. A. Schwitkis, H. Yamamoto, S. O. Melnikoff, Hiroaki Aihara, J. N. Marx, R. I. Koda, J. Hylen, N. Toge, S. J. Yellin, S. J. Maxfield, C. Zeitlin, F. R. Rouse, C. S. Lindsey, K. A. Derby, R. W. Kenney, J. T. White, J. C. Sens, D. O. Caldwell, W. Vernon, M. S. C. Williams, Z. R. Wolf, G. Cowan, Mitchell Wayne, J. Thompson, Marjorie Shapiro, W. Moses, G. J. VanDalen, B. D. Magnuson, J. W. Gary, D. A. Park, Toshitsugu Fujii, Philippe Eberhard, H. S. Kaye, T. K. Edberg, G. R. Lynch, Y. X. Wang, Tadayuki Takahashi, Ryoji Enomoto, W. E. Slater, M. G. Strauss, A. Buijs, P. J. Oddone, F.L. Linde, Werner Hofmann, R.E. Avery, R. R. Ross, T. Bolognese, H. P. Paar, R. J. Madaras, D. A. Crane, W. Gorn, S. K. Park, J. J. Eastman, W.A. Wenzel, Gilbert Shapiro, M. L. Stevenson, M. T. Ronan, K. K. Kwong, M. Pripstein, J. A. J. Matthews, M. K. Sullivan, A. D. Bross, A.R. Barker, J. R. Smith, K. H. Kees, D. R. Nygren, J. M. Hauptman, W. M. Zhang, R. R. Kofler, F. C. Erné, A. M. Eisner, Winston Ko, G. J. Bobbink, Orin I. Dahl, D. L. Bintinger, Wolfgang Wagner, A. R. Clark, D.A. Bauer, L. T. Kerth, A. V. Barnes, D. H. Stork, and J. G. Layter

Subjects
Baryon, Nuclear physics, Physics, Particle physics, Annihilation, Electron–positron annihilation, General Physics and Astronomy
Published
1986

16. Charged-Hadron Inclusive Cross Sections and Fractions ine+e−Annihilation ats=29GeV

Author

A.R. Barker, D. R. Nygren, H. Yamamoto, J. G. Layter, G. E. Masek, J. M. Hauptman, S. J. Yellin, W. Moses, F. C. Erné, A. M. Eisner, F. R. Rouse, J. C. Sens, Z. R. Wolf, W. Vernon, M. Pripstein, S. Khacheryan, D. O. Caldwell, S. J. Maxfield, M. K. Sullivan, D. H. Stork, W. G.J. Langeveld, G. Cowan, J. R. Smith, Philippe Eberhard, R. R. Kofler, R. W. Kenney, B. C. Shen, A. Barbaro-Galtieri, Orin I. Dahl, D.A. Bauer, A. Lu, S. Toutounchi, Wolfgang Wagner, D. A. Crane, S. K. Park, J. Hylen, J. A. J. Matthews, T. K. Edberg, D. E. Pellett, F.L. Linde, B. D. Magnuson, A. R. Clark, G. J. Bobbink, H. P. Paar, J. S. Steinman, C. D. Buchanan, G. R. Lynch, H. Y. Chao, W.A. Wenzel, M. G. Strauss, T. Kamae, S. C. Loken, Gilbert Shapiro, Werner Hofmann, K. A. Derby, A. Bay, Y. X. Wang, Tadayuki Takahashi, M. L. Stevenson, P. J. Oddone, E. M. Wang, R. R. Ross, R. J. Madaras, Margaret Alston-Garnjost, R. van Tyen, H. S. Kaye, M. T. Ronan, K. H. Fairfield, H. Aihara, Ryoji Enomoto, E. S. Miller, K. A. Schwitkis, A. Buijs, R.E. Avery, J. J. Eastman, M. Daoudi, B. A. Barnett, L. Mathis, W. T. Lin, S. B. Chun, C. Zeitlin, and R. W. Stephens

Subjects
Nuclear physics, Physics, Particle physics, Annihilation, Hadron, General Physics and Astronomy
Published
1988

17. Comparison of the Particle Flow inqq¯gandqq¯γEvents ine+e−Annihilation

Author

S. O. Melnikoff, A.R. Barker, R. R. van Daalen Wetters, M. Yamauchi, A. D. Bross, F.L. Linde, A. Buijs, S. J. Yellin, E. M. Wang, R. W. Kenney, R.E. Avery, W. E. Slater, Margaret Alston-Garnjost, R. van Tyen, T. Bolognese, J. S. Steinman, J. N. Marx, M. T. Ronan, K. K. Kwong, J. E. Huth, C. S. Lindsey, J. M. Hauptman, H. Aihara, D. A. Crane, Y. X. Wang, Tadayuki Takahashi, B. C. Shen, H. P. Paar, D. L. Bintinger, K. Maruyama, G. E. Masek, J. A. J. Matthews, P. J. Oddone, C. Zeitlin, T. Kamae, D.A. Bauer, D. E. Pellet, M. G. Strauss, R. R. Ross, W.A. Wenzel, R. I. Koda, Gilbert Shapiro, Philippe Eberhard, R. J. Madaras, M. S. C. Williams, B. D. Magnuson, M. L. Stevenson, H. U. Bengtsson, W. Vernon, S. J. Maxfield, J. J. Eastman, C. D. Buchanan, M. Pripstein, G. Cowan, W. G.J. Langeveld, G. J. VanDalen, X. Q. Lu, W. Moses, L. T. Kerth, D. A. Park, B. van Uitert, H. S. Kaye, Z. R. Wolf, S. C. Loken, A. Lu, M. K. Sullivan, J. Hylen, Ryoji Enomoto, G. R. Lynch, M. P. Cain, Peter Nemethy, W. Gorn, J. W. Gary, F. C. Erné, B. A. Barnett, A. M. Eisner, Werner Hofmann, Kaori Maeshima, G. J. Bobbink, A. R. Clark, Winston Ko, J. R. Smith, K. A. Derby, A. V. Barnes, D. H. Stork, K. H. Kees, J. G. Layter, W. M. Zhang, R. R. Kofler, Orin I. Dahl, Wolfgang Wagner, D. R. Nygren, Marjorie Shapiro, H. Yamamoto, F. R. Rouse, N. Toge, L. Mathis, R. R. McNeil, R. Lander, Toshitsugu Fujii, Mitchell Wayne, J. Thompson, E. S. Miller, K. A. Schwitkis, A. Barbaro-Galtieri, J. C. Sens, D. O. Caldwell, and J. T. White

Subjects
Quark, Quantum chromodynamics, Physics, Particle physics, Annihilation, Astrophysics::High Energy Astrophysical Phenomena, High Energy Physics::Lattice, Electron–positron annihilation, Nuclear Theory, High Energy Physics::Phenomenology, General Physics and Astronomy, Elementary particle, Jet (particle physics), Nuclear physics, Massless particle, High Energy Physics::Experiment, Event (particle physics)
Abstract

We compare the particle flow in the event plane of three-jet qq-barg (quark-antiquark-gluon) events with the particle flow in radiative annihilation events qq-bar..gamma.. (quark-antiquark-photon) for similar kinematic configurations. In the angular region between quark and antiquark jet, we find a significant decrease in particle density for qq-barg as compared to qq-bar..gamma... This effect is predicted in QCD as a result of destructive interference between soft-gluon radiation from quark, antiquark, and hard gluon.

Published
1986

18. Charged hadron production in e/sup /+//e/sup /-// annihilation at. sqrt. s = 29 GeV

Author

B. A. Barnett, D.A. Bauer, H.U. Bengtsson, C.D. Buchanan, Margaret Alston-Garnjost, R.E. Avery, A.R. Barker, A. Barbaro-Galtieri, G.J. Bobbink, and H. Aihara

Subjects
Physics, Nuclear physics, Particle physics, Annihilation, Meson, Quark model, Hadron, High Energy Physics::Experiment, Rapidity, Charged particle, Particle identification, Hadronization
Abstract

We have used data from the Time Projection Chamber at the SLAC storage ring PEP to study the inclusive production of charged hadrons in e/sup /+//e/sup /-// annihilation at a center of mass energy of 29 GeV. Charged particles were identified by simultaneous dEdx and momentum measurements. We present cross sections and particle fractions for ..pi../sup/plus minus//, k/sup + -/, and p(/ovr/p//) as a function of energy, momentum, rapidity, and transverse momentum. We compare the predictions of various hadronization models to the data and note discrepancies at high momentum.

Published
1988

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