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1. Study of χc2 production in photon-photon collisions

Author

A. R. Clark, D. E. Pellet, William A. Wenzel, D. J. Lambert, S. C. Loken, G. Masek, B. C. Shen, J. Lys, J. J. Eastman, Ronald R. Ross, K. T. Knöpfle, S. J. Yellin, G. S. Greenbaum, R. L. Holtzapple, M. K. Sullivan, C. Zeitlin, H. H. Bingham, W. Vernon, D. O. Caldwell, D. A. Bauer, J. M. Hauptman, S. Khacheryan, J. G. Layter, E. M. Wang, S. B. Chun, K. H. Fairfield, G. Lynch, M. G. Strauss, C. D. Buchanan, Werner Hofmann, M. T. Ronan, A. P.T. Palounek, H. Yamamoto, N. A. Nicol, M. L. Stevenson, R. C. Berg, W. T. Lin, A. M. Eisner, A. Lu, Y. T. Oyang, Orin I. Dahl, H. Marsiske, George P Yost, D. R. Nygren, R. R. Kofler, G. Zapalac, M. Daoudi, G. Godfrey, R. Belcinski, H. P. Paar, Y. X. Wang, Gilbert Shapiro, R. W. Stephens, E. S. Miller, and R. J. Madaras

Subjects
Quantum chromodynamics, Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Photon, Meson, law, Elementary particle, State (functional analysis), Collider, law.invention, Lepton
Abstract

Two-photon production of the charmonium state χ c has been studied by the TPC/Two-Gamma experiment at the SLAC e + e − collider PEP. We observe evidence of the χ c 2 state in the channel γγ → χ c 2 , χ c 2 → γJ / ψ , J / ψ → l + l − and obtain a value of Γ γγ ( χ c 2 )=3.4±1.7±0.9 keV. This is the first observation of the two-photon production of a χ c state. Comparison is made with previous experimental results and QCD predictions for Γ γγ ( χ c 2 ).

Published
1993
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2. Photoproduction of an isovector ρπ state at 1775 MeV

Author

H. Yuta, J. Shimony, I. A. Pless, T. Kitagaki, I. M. Godfrey, Y. Yoshimura, P. Dingus, R. N. Diamond, S. Tether, James Shank, M. Jobes, H.O. Cohn, E. L. Hart, Shlomo Dado, S. J. Sewell, R. C. Field, D. A. Waide, J. Ballam, J. E. Brau, C. Milstene, W. Cameron, S. Wolbers, W. D. Walker, D. C. Colley, R. K. Yamamoto, H. J. Hargis, K. Braune, A. T. Goshaw, C. G. Wilkins, E. McCrory, M. J. Harwin, V. R. O’Dell, K. Tamai, George P Yost, S. Noguchi, M. Widgoff, T. Handler, R. Armenteros, S. Tanaka, T. C. Bacon, A. M. Shapiro, T. Sato, K. C. Moffeit, A. Yamaguchi, D. P. Kelsey, S.L. White, K. Hasegawa, T. Glanzman, T. Kafka, S. W. O'Neale, J. J. Goldberg, A. Falicov, H. Sagawa, R. Merenyi, Aharon Levy, P. Rankin, K. Abe, G.T. Condo, L.R. Fortney, Edwin R. Hancock, G. E. Kalmus, W. A. Mann, R. I. Hulsizer, A. Napier, D. H. Brick, J. M. Butler, N. Fujiwara, R. Erickson, H. H. Bingham, B. Franek, W. M. Bugg, C. A. Woods, R. Sugahara, J. Schneps, J. Kent, A. P. T. Palounek, W. J. Robertson, P. W. Lucas, R. H. Milburn, G. Hall, M. Austern, and K. Takahashi

Subjects
Nuclear physics, Physics, Particle physics, Pion, Isovector, Meson, TheoryofComputation_ANALYSISOFALGORITHMSANDPROBLEMCOMPLEXITY, Hadron, Mass spectrum, Elementary particle, Spectral line, Boson
Abstract

Evidence is presented for the charge-exchange photoproduction, in two distinct reactions, of an isovector {rho}{pi} state of mass {similar to}1775 MeV. Results of an analysis of the decay-angular distributions are also presented, from which it is concluded that {ital J}{sup {ital P}}=1{sup {minus}}, 2{sup {minus}}, or 3{sup +}.

Published
1991
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3. Test of spin dependence in charm-quark fragmentation to D*

Author

K. A. Schwitkis, R. W. Stephens, Ronald R. Ross, W. Vernon, M. T. Ronan, B. C. Shen, W. A. Wenzel, T. K. Edberg, D. J. Lambert, M. Pripstein, W. T. Lin, Allan G Clark, J. S. Steinman, K. H. Fairfield, R. R. Kofler, M. L. Stevenson, A. Fridman, S. K. Park, Robert W. Kenney, T. Kamae, S. Khacheryan, A. P.T. Palounek, D. A. Crane, J. M. Hauptman, C. D. Buchanan, H. P. Paar, A. Bay, S. J. Yellin, N. A. Nicol, J. J. Eastman, G. D. Cowan, F. R. Rouse, H. Marsiske, G. Zapalac, A. Lu, Philippe Eberhard, S. J. Maxfield, Hiroaki Aihara, C. Ho, S. Toutounchi, Margaret Alston-Garnjost, Elliott D. Bloom, Y. T. Oyang, R. van Tyen, H. Y. Chao, C. Zeitlin, A. R. Barker, S. C. Loken, S. B. Chun, E. S. Miller, G. Lynch, J. G. Layter, R. E. Avery, H. Yamamoto, K. A. Derby, P. J. Oddone, B. D. Magnuson, Werner Hofmann, E. M. Wang, M. G. Strauss, H. Oh, J. Lys, R. J. Madaras, F.L. Linde, H. H. Bingham, J. C. Sens, D. R. Nygren, D. O. Caldwell, Tadayuki Takahashi, George P Yost, Orin I. Dahl, M. Daoudi, R. Belcinski, G. Masek, Y. X. Wang, D. H. Stork, Z. R. Wolf, Willem G. J. Langeveld, G. Shapiro, A. M. Eisner, D. E. Pellett, G. J. VanDalen, F. C. Erné, D. A. Bauer, G. Godfrey, M. K. Sullivan, J. R. Smith, L. G. Mathis, and IHEF (IoP, FNWI)

Subjects
Quark, Physics, Density matrix, Particle physics, Annihilation, Time projection chamber, Computer Science::Information Retrieval, Elementary particle, Fermion, Helicity, Charm quark, Nuclear physics, TheoryofComputation_ANALYSISOFALGORITHMSANDPROBLEMCOMPLEXITY, High Energy Physics::Experiment
Abstract

We have measured the polarization of {ital D}{sup *}, the energy dependence of the polarization, and the spin-density matrix of {ital D}{sup *} in {ital e}{sup +}{ital e{minus}} annihilation at a center-of-mass energy of 29 GeV using the Time Projection Chamber detector at the SLAC storage ring PEP. In 147 pb{sup {minus}1} of data we see no strong evidence for polarization, alignment, or final-state interactions in this fragmentation process.

Published
1991

4. Erratum

Author

Thomas G Trippe, G. Conforto, Mahiko Suzuki, Alan Rittenberg, K Gieselmann, L. Montanet, F. C. Porter, Kaoru Hagiwara, R. Shrock, R. J. Morrison, R. M. Barnett, Keith A. Olive, R. H. Schindler, G. Höhler, G. R. Lynch, J. J. Hernandez, R A Eichler, K. R. Schubert, Nils A. Tornqvist, J J Eastman, George P Yost, Ken Ichi Hikasa, S. Kawabata, C. Caso, Matts Roos, H G Hayes, James R. Stone, D. E. Groom, Charles G Wohl, M. Aguilar-Benitez, B. Armstrong, and G.S. Wagman

Subjects
Physics, Baryon, Nuclear and High Energy Physics, Particle physics, Particle properties, Meson, Bibliography, Table (database), Data compilation, Statistical physics, Lepton
Published
1991
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5. Measurement of the total hadronic cross section in taggedγγreactions

Author

N. A. Nicol, Orin I. Dahl, F. R. Rouse, J. G. Layter, J. J. Eastman, R. Belcinski, S. Toutounchi, G. Masek, Robert W. Kenney, D. H. Stork, C. Ho, M. K. Sullivan, L. G. Mathis, C. Zeitlin, H. Aihara, Philippe Eberhard, A. R. Clark, S. J. Maxfield, R. E. Avery, M. G. Strauss, S. K. Park, T. Kamae, E. M. Wang, T. K. Edberg, S. C. Loken, William A. Wenzel, Z. R. Wolf, W. Vernon, M. Pripstein, Willem G. J. Langeveld, J. S. Steinman, K. A. Derby, M. T. Ronan, M. L. Stevenson, Werner Hofmann, P. J. Oddone, W. T. Lin, W. Wagner, D. A. Bauer, R. R. McNeil, George P Yost, Y. T. Oyang, D. E. Pellett, Tadayuki Takahashi, G. Godfrey, J. Lys, A. Fridman, M. Daoudi, R. R. Kofler, H. Yamamoto, B. D. Magnuson, H. Oh, D. R. Nygren, J. C. Sens, H. H. Bingham, Gilbert Shapiro, D. O. Caldwell, S. Khacheryan, S. J. Yellin, J. R. Smith, S. B. Chun, R. W. Stephens, G. Lynch, F. C. Erné, A. M. Eisner, Ronald R. Ross, K. H. Fairfield, H. P. Paar, G. J. VanDalen, J. M. Hauptman, C. D. Buchanan, K. A. Schwitkis, H. Marsiske, A. P.T. Palounek, G. D. Cowan, A. Bay, D. J. Lambert, G. Zapalac, Margaret Alston-Garnjost, R. van Tyen, A. R. Barker, H. Y. Chao, D. A. Crane, F.L. Linde, R. J. Madaras, B. C. Shen, A. Lu, Elliott D. Bloom, Y. X. Wang, and E. S. Miller

Subjects
Physics, Quantum chromodynamics, Nuclear physics, Particle physics, Photon, Scattering, Hadron, Elementary particle, Parton, Fermion, Energy (signal processing)
Abstract

We present a measurement of the total cross section for {gamma}{gamma}{r arrow}hadrons, with one photon quasireal and the other a spacelike photon of mass squared {minus}{ital Q}{sup 2}. Results are presented as a function of {ital Q}{sup 2} and the {gamma}{gamma} center-of-mass energy {ital W}, with the {ital Q}{sup 2} range extending from 0.2 to 60 GeV{sup 2}, and {ital W} in the range from 2 to 10 GeV. The data were taken with the TPC/Two-Gamma facility at the SLAC {ital e}{sup +}{ital e}{sup {minus}} storage ring PEP, which was operated at a beam energy of 14.5 GeV. The cross section exhibits a gentle falloff with increasing {ital W}. Its {ital Q}{sup 2} dependence is shown to be well described by an incoherent sum of vector-meson and pointlike scattering over most of the observed {ital W} range. Agreement at high {ital Q}{sup 2} is improved if a minimum-{ital p}{sub {ital T}} cutoff (motivated by QCD) is imposed on the pointlike contribution.

Published
1990
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6. Measurement of the kaon content of three-prong tau decays

Author

M. K. Sullivan, H. Yamamoto, S. J. Yellin, D. E. Pellett, Y. X. Wang, J. Lys, G. S. Greenbaum, R. L. Holtzapple, G. Zapalac, E. M. Wang, H. H. Bingham, George P Yost, S. C. Loken, S. Khacheryan, R. R. Ross, D. O. Caldwell, G. R. Lynch, A. Lu, D. R. Nygren, R. J. Madaras, G. Godfrey, W.A. Wenzel, Gilbert Shapiro, A. M. Eisner, M. L. Stevenson, K. T. Knöpfle, E. S. Miller, R. C. Berg, Werner Hofmann, J. M. Hauptman, R. R. Kofler, Philippe Eberhard, D. J. Lambert, H. P. Paar, Y. T. Oyang, Orin I. Dahl, M. T. Ronan, K. H. Fairfield, H. Marsiske, C. D. Buchanan, W. Vernon, N. A. Nicol, A. P.T. Palounek, R. Belcinski, M. G. Strauss, S. B. Chun, E.E. Bloom, A. R. Clark, D.A. Bauer, J. J. Eastman, G. E. Masek, and R. W. Stephens

Subjects
Combinatorics, Physics, Systematic error, Particle physics, Branching fraction, TheoryofComputation_ANALYSISOFALGORITHMSANDPROBLEMCOMPLEXITY, TheoryofComputation_GENERAL, MathematicsofComputing_DISCRETEMATHEMATICS
Abstract

We present branching fraction measurements of three-prong decays of the [tau][sup [minus]] lepton based on data from the TPC/Two-Gamma detector at SLAC PEP. The decays are classified according to the identities of the charged tracks to give simultaneous measurements of [ital B][[tau][sup [minus]][r arrow][nu][sub [tau]] [ital K][sup [minus]][pi][sup +][pi][sup [minus]]]=0.58[sub [minus]0.13][sup +0.15]% and [ital B][[tau][sup [minus]][r arrow][nu][sub [tau]] [ital K][sup [minus]][ital K][sup +][pi][sup [minus]]]=0.15[sub [minus]0.07][sup +0.09]%, and upper limits of [ital B][[tau][sup [minus]][r arrow][nu][sub [tau]][pi][sup [minus]][ital K][sup +][pi][sup [minus]]][lt]0.25%, [ital B][[tau][sup [minus]][r arrow][nu][sub [tau]] [ital K][sup [minus]][pi][sup +][ital K][sup [minus]]][lt]0.09%, and [ital B][[tau][sup [minus]][r arrow][nu][sub [tau]] [ital K][sup [minus]][ital K][sup +][ital K][sup [minus]]][lt]0.21%, where additional neutrals may be present in each case. The branching fractions are normalized to the world average three-prong topological branching fraction and there is an estimated 20% systematic error in addition to the listed statistical errors. We find the mass distributions in the [ital K][sup [minus]][pi][sup +][pi][sup [minus]] decay are consistent with [ital K][sub 1] dominance, and obtain branching fractions of [ital B][[tau][sup [minus]][r arrow][nu][sub [tau]] [ital K][sub 1][sup [minus]](1270)]=0.41[sub [minus]0.35][sup +0.41]% and [ital B][[tau][sup [minus]][r arrow][nu][sub [tau]] [ital K][sub 1][sup [minus]](1400)]=0.76[sub [minus]0.33][sup +0.40]%.

Published
1994

7. Inclusive D*+- production in photon-photon collisions

Author

G. Shapiro, L. G. Mathis, S. Yellin, J. J. Eastman, T. K. Edberg, S. K. Park, S. Khacheryan, S. Toutounchi, P. J. Oddone, R. W. Stephens, J. S. Steinman, W. Vernon, A. Bay, G. Zapalac, W. T. Lin, C. Zeitlin, Margaret Alston-Garnjost, D. A. Crane, B. C. Shen, G. Masek, R. R. Ross, K. H. Fairfield, H. P. Paar, A. Lu, Elliott D. Bloom, R. R. Kofler, Y. T. Oyang, S. B. Chun, R. J. Madaras, G. Lynch, M. L. Stevenson, D. H. Stork, J. Lys, J. G. Layter, D. A. Bauer, R. E. Avery, K. T. Knopfle, H. Marsiske, S. C. Loken, M. T. Roman, H. Yamamoto, J. M. Hauptman, E. M. Wang, Orin I. Dahl, P. H. Eberhard, E. S. Miller, G. Godfrey, D. R. Nygren, Werner Hofmann, N. A. Nicol, F. C. Erné, H. Y. Chao, F.L. Linde, M. Pripstein, Allan G Clark, George P Yost, A. Buijs, C. D. Buchanan, M. Daoudi, M. G. Strauss, R. Belcinski, H. H. Bingham, A. R. Barker, D. E. Pellett, D. J. Lambert, W. A. Wenzel, Y. X. Wang, M. K. Sullivan, Willem G. J. Langeveld, R. W. Kenney, A. M. Eisner, A. P.T. Palounek, J. C. Sens, D. O. Caldwell, and IHEF (IoP, FNWI)

Subjects
Physics, Quark, Nuclear and High Energy Physics, Particle physics, Photon, Meson, Nuclear Theory, High Energy Physics::Phenomenology, Hadron, Parton, Hadronization, Nuclear physics, High Energy Physics::Experiment, Production (computer science), Nuclear Experiment
Abstract

The TPC/Two-Gamma Collaboration has measured the inclusive cross section for production of charmed D∗± mesons in photon-photon collisions. The reaction utilized was e+e-→e+e-D∗±X, with D∗±→DOπ+-, DO→K-+π ±, and either zero or one outgoing e± detected. The result, σ(e + e - → e + e - D ∗± X) = 74±26±19 pb , is in agreement with the quark parton mo del prediction for e+e- → e+e-c c , combined with a Lund model for the hadronization of the charmed quarks.

Published
1990

8. Limits on the neutrino oscillationsν¯μ→ν¯eandν¯μ→ν¯τusing a narrow-band beam

Author

F. A. Harris, D. Gee, E. E. Schmidt, J. Lys, H. H. Bingham, W. M. Smart, Sherwood Parker, M. D. Jones, Vincent Z. Peterson, M. L. Stevenson, George P Yost, R. J. Cence, G. N. Taylor, F. R. Huson, V. J. Stenger, E. Treadwell, M. W. Peters, T. Lawry, and H. C. Ballagh

Subjects
Physics, Particle physics, Antiparticle, Antimatter, Quark model, Elementary particle, Fermion, Neutrino, Energy (signal processing), Lepton
Abstract

In an exposure of the Fermilab 15-ft bubble chamber to the dichromatic antineutrino beam, 427 ${\overline{\ensuremath{\nu}}}_{\ensuremath{\mu}}$ charged-current interactions were obtained. Taking advantage of the small and well understood background flux of ${\overline{\ensuremath{\nu}}}_{e}'\mathrm{s}$ in the dichromatic ${\overline{\ensuremath{\nu}}}_{\ensuremath{\mu}}$ beam, upper limits on the rates of antineutrino oscillations are obtained, with the precision limited by statistical rather than systematic errors, in contrast to previous experiments. The 90%-C.L. upper limits obtained for the average oscillation probabilities indicated are $P({\overline{\ensuremath{\nu}}}_{\ensuremath{\mu}}\ensuremath{\rightarrow}{\overline{\ensuremath{\nu}}}_{e})l6.5\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}3}$ and $P({\overline{\ensuremath{\nu}}}_{\ensuremath{\mu}}\ensuremath{\rightarrow}{\overline{\ensuremath{\nu}}}_{\ensuremath{\tau}})l4.4\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}2}$. The mean value of the distance from the neutrino-production point to the bubble chamber divided by the neutrino energy, $〈\frac{l}{E}〉$, is 0.03 m/MeV.

Published
1983
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9. Dilepton production by neutrinos in the Fermilab 15-foot bubble chamber

Author

W. M. Smart, T. Lawry, T. H. Burnett, A. Greene, J. Wolfson, G.M. Swider, H. Rudnicka, M. W. Peters, T. Murphy, P. McCabe, Ugo Camerini, J. Orthel, George P Yost, Henry Lubatti, Sokoloff, E. Treadwell, W. F. Fry, R. Benada, F. A. Harris, Bruce L. Chrisman, F. R. Huson, R. Loveless, E. Wolin, D. Gee, W.B. Fretter, K. Moriyasu, E. E. Schmidt, J. P. Marriner, G. Harigel, D.D. Reeder, M. L. Stevenson, R. J. Cence, J. Lys, H. C. Ballagh, H. H. Bingham, M. E. Duffy, L. Fluri, G. R. Lynch, Vincent Z. Peterson, Jones, D. Holmgren, D. Rees, and Sherwood Parker

Subjects
Nuclear physics, Nuclear reaction, Physics, Particle physics, Particle decay, Muon, Pair production, Meson, Branching fraction, Hadron, Lepton
Abstract

In an exposure of the Fermilab 15-foot neon-hydrogen bubble chamber to a quadrupole triplet neutrino beam, 49 ..mu../sup -/e/sup +/ and 14 ..mu../sup +/e/sup -/ events with e/sup + -/ momenta greater than 0.3 GeV/c have been observed, yielding ..mu..e rates per charged-current event of (0.73 +- 0.11)% and (1.1 +- 0.3)%, respectively. The ..mu../sup -/e/sup +/ rate shows no strong energy dependence in the range from 30 to 300 GeV. The 18 neutral strange particles observed in the 63 events contain 14 K/sup 0//sub S/, 2 ..lambda.., and 2 ..lambda../K/sup 0//sub S/ ambiguities, suggesting that the events are predominantly D-meson production and decay and that the ..lambda../sup +//sub c/..--> lambda..eX branching ratio is very small. The corrected numbers of neutral strange particles per ..mu../sup -/e/sup +/ and ..mu../sup +/e/sup -/ event are 1.2 +- 0.3 and 0.6/sup +0.6//sub -0.3/, respectively. Properties of the events, including strange-particle production, are compared to ..mu../sup - +/..mu../sup + -/ events in the same experiment and to a charm production and decay model, and good agreement is found, apart from a possible enhancement at approx.5--6 GeV/c/sup 2/ in the mass of the system recoiling against the ..mu../sup +/ in ..mu../sup +/e/sup -/ (and ..mu../supmore » +/..mu../sup -/) events. As reported previously, four events show short-lived-particle decays, and D-meson lifetime estimates are reevaluated using the final event sample. One ..mu../sup +/e/sup +/ and three ..mu../sup -/e/sup -/ events were observed. The ..mu../sup -/e/sup -/ events are consistent with background and lead to a ..mu../sup -/e/sup -//..mu../sup -/e/sup +/ ratio of less than 0.07 (90% confidence level) for e/sup + -/ momenta above 0.8 GeV/c. Five candidates for dilepton production by electron neutrinos and antineutrinos in the beam are consistent with approximately 1% rates. No good three-lepton candidates were found, and one, previously reported, four-lepton candidate was found.« less

Published
1981
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10. π−pinteractions at 205 GeV/c: Multiplicities of charged and neutral particles; production of neutral particles

Author

D.M. Chew, F. R. Huson, F. C. Winkelmann, G. H. Trilling, W. M. Smart, George P Yost, Gerson Goldhaber, C. Pascaud, L. Stutte, A. D. Johnson, S. M. Pruss, W.R. Graves, S. Kahn, J. A. Kadyk, D. Bogert, R. Hanft, H. H. Bingham, W.B. Fretter, B.Y. Daugeras, and D. Ljung

Subjects
Physics, Particle physics, Incident energy, Multiplicity (mathematics), Hydrogen bubble, Atomic physics, Lambda, Charged particle
Abstract

A study of 205-GeV/c ${\ensuremath{\pi}}^{\ensuremath{-}}p$ interactions has been made with a 48 800-picture exposure in the bare Fermilab 30-inch hydrogen bubble chamber. The average number of charged particles produced per inelastic interaction is 7.99\ifmmode\pm\else\textpm\fi{}0.06. The elastic cross section is 3.18\ifmmode\pm\else\textpm\fi{}0.13 mb and the total cross section is 24.19\ifmmode\pm\else\textpm\fi{}0.44 mb. The inclusive cross sections for neutral-particle production are: $\ensuremath{\sigma}(\ensuremath{\gamma})=171.3\ifmmode\pm\else\textpm\fi{}15.3$ mb, $\ensuremath{\sigma}({K}_{S}^{0})=3.64\ifmmode\pm\else\textpm\fi{}0.61$ mb ($xl0.3$), $\ensuremath{\sigma}(\ensuremath{\Lambda})=1.71\ifmmode\pm\else\textpm\fi{}0.34$ mb ($xl0.3$), and $\ensuremath{\sigma}(\overline{\ensuremath{\Lambda}})=0.59\ifmmode\pm\else\textpm\fi{}0.23$ mb ($xl0.1$). The average number of ${\ensuremath{\pi}}^{0}'\mathrm{s}$ produced per inelastic collision is consistent with a linear rise with the number of charged particles, and about equal to the number of produced ${\ensuremath{\pi}}^{\ensuremath{-}}$ or ${\ensuremath{\pi}}^{+}$. The average number of ${K}^{0}'\mathrm{s}$, $\ensuremath{\Lambda}'\mathrm{s}$, and $\overline{\ensuremath{\Lambda}}'\mathrm{s}$ is consistent with very little dependence on the number of charged particles. General characteristics of neutral-particle production are presented and compared with other experiments. For each topology the produced neutral energy is $\ensuremath{\sim}\frac{1}{3}$ of the incident energy.

Published
1977
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11. Introduction

Author

R L Crawford, Charles G Wohl, M. Aguilar-Benitez, Alan Rittenberg, G.S. Wagman, G. R. Lynch, K. R. Schubert, B. Armstrong, G. Höhler, F. C. Porter, R Frosch, R. H. Schindler, G. Gopal, R A Eichler, L D Roper, Matts Roos, Ian Hinchliffe, D. M. Manley, Tokuzo Shimada, Robert Shrock, J. J. Hernandez, L. Montanet, Joel R Primack, Thomas G Trippe, Nils A. Tornqvist, W P Trower, George P Yost, Kenneth G. Hayes, and R. M. Barnett

Subjects
Baryon, Physics, Nuclear and High Energy Physics, Particle physics, Particle properties, Meson, Data compilation, Table (information), Lepton
Published
1986
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12. Observation of Muon Inner Bremsstrahlung in Deep-Inelastic Neutrino Scattering

Author

D. Gee, R. Loveless, E. Wolin, M. D. Sokoloff, M. W. Peters, G. R. Lynch, Vincent Z. Peterson, Ugo Camerini, J. Lys, D.D. Reeder, W. F. Fry, M. Gee, H. H. Bingham, M. D. Jones, R. J. Cence, Sherwood Parker, E. Treadwell, K. Moriyasu, G. N. Taylor, W. M. Smart, George P Yost, F. A. Harris, E. E. Schmidt, M. L. Stevenson, V. J. Stenger, A. Koide, Henry Lubatti, H. C. Ballagh, T. Lawry, and F. R. Huson

Subjects
Physics, Particle physics, Muon, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, Bremsstrahlung, Gamma ray, General Physics and Astronomy, Inelastic scattering, Deep inelastic scattering, Nuclear physics, Muon collider, Physics::Accelerator Physics, High Energy Physics::Experiment, Neutrino, Nuclear Experiment, Lepton
Abstract

In a neutrino bubble-chamber experiment with a mean event energy of 90 GeV, clear evidence is observed for muon inner bremsstrahlung. The corrected rate, for gamma rays with E/sub ..gamma../>1 GeV and within 32 mrad of the muon direction, is 0.027 +- 0.005 per charged current event. Comparison with QED calculations is discussed.

Published
1983
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13. A neutrino (antineutrino)-induced four lepton event

Author

H. C. Ballagh, A. Greene, D. Minette, D. Gee, M. W. Peters, Sherwood Parker, N. Wyatt, D. Holmgren, George P Yost, M. D. Jones, M. E. Duffy, R. J. Cence, W. M. Smart, Bruce L. Chrisman, G. Harigel, D.D. Reeder, H. Rudnicka, J. P. Marriner, Henry Lubatti, T. Murphy, M.D. Sokoloff, G. Lynch, B. S. Yuldashev, Vincent Z. Peterson, E. E. Schmidt, Ugo Camerini, T. Lawry, T. H. Burnett, M. L. Stevenson, M. Ngai, W. F. Fry, J. Orthel, G.M. Swider, K. Moriyasu, J. Lys, H. H. Bingham, R. Benada, F. A. Harris, E. Wolin, R. Loveless, P. McCabe, F. R. Huson, W.B. Fretter, and J. Wolfson

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Muon, Meson, Physics::Instrumentation and Detectors, chemistry.chemical_element, Electron, Nuclear physics, Neon, chemistry, Bubble chamber, High Energy Physics::Experiment, Neutrino, Event (particle physics), Lepton
Abstract

We report observation of a neutrino (antineutrino)-induced event with two electrons, one positron, one positively charged muon, a neutral K meson, and seven gammas in an experiment performed in the FNAL 15-ft. bubble chamber with a 47% atomic mixture of neon in hydrogen. Estimated experimental electron backgrounds are ∼10 −4 per track. At present we have no plausible interpretation of this event.

Published
1978
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14. Evidence for Hard-Gluon Bremsstrahlung in a Deep-Inelastic Neutrino Scattering Experiment

Author

W. F. Fry, K. Moriyasu, F. R. Huson, D.D. Reeder, J. Orthel, M. D. Jones, M. W. Peters, F. A. Harris, T. Lawry, T. H. Burnett, W.B. Fretter, G.M. Swider, D. Rees, G. N. Taylor, M. D. Sokoloff, W. M. Smart, Ugo Camerini, V. J. Stenger, A. Koide, G. R. Lynch, J. Lys, E. Treadwell, D. J. Miller, H. H. Bingham, H. C. Ballagh, Henry Lubatti, M. Ngai, D. Gee, Sherwood Parker, R. Loveless, E. E. Schmidt, M. L. Stevenson, Vincent Z. Peterson, R. J. Cence, E. Wolin, and George P Yost

Subjects
Nuclear physics, Physics, Particle physics, Bremsstrahlung, General Physics and Astronomy, Neutrino scattering, Gluon
Published
1981
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15. Rescattering in the nucleus forπ−dinteractions at 15 GeV/c

Author

F. C. Porter, W.B. Fretter, L.A. Dunn, W.R. Graves, H. H. Bingham, Henry Lubatti, George P Yost, and K. Moriyasu

Subjects
Physics, Nuclear physics, Nuclear reaction, Antiparticle, Particle physics, Pair production, Deuterium, Antimatter, Elementary particle, Multiplicity (chemistry), Charged particle
Abstract

We present the ..pi../sup -/d charged multiplicity distributions at 15 GeV/c and examine the probability that the products of a ..pi../sup -/n collision in a deuterium nucleus rescatter on the proton. Averaged over all topologies, this probability is 0.13 +- 0.02. The rescatter probability as a function of the number of charged particles produced in the ..pi../sup -/n interaction exhibits an increase at high multiplicity.

Published
1980
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16. Observation ofμeEvents inν¯andνInteractions in Neon

Author

V. J. Stenger, H. Rudnicka, J. F. Grivaz, G.M. Swider, T. Katsura, M. D. Jones, J. Orthel, K. Moriyasu, F. A. Harris, Vincent Z. Peterson, M. W. Peters, G. R. Lynch, S. Csorna, H. H. Bingham, M. D. Sokoloff, P. Bosetti, W.B. Fretter, R. J. Cence, Sherwood Parker, D. Gee, George P Yost, H. C. Ballagh, M. L. Stevenson, F. C. Porter, J. P. Marriner, B. S. Yuldashev, Henry Lubatti, and T. H. Burnett

Subjects
Physics, Particle physics, Muon, General Physics and Astronomy, chemistry.chemical_element, Nuclear physics, Neon, chemistry, Antimatter, Bubble chamber, Fermilab, Neutrino, Charged current, Lepton
Published
1977
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17. Review of particle properties

Author

L. Montanet, Matts Roos, Thomas G Trippe, Alan Rittenberg, Naomi Barash-Schmidt, George P Yost, C.P. Horne, M.J. Losty, Tokuzo Shimada, C. Dionisi, R.L. Crawford, Charles G Wohl, Robert L Kelly, C. Bricman, M. Mazzucato, and B. Armstrong

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Gauge boson, Particle properties, Meson, 010308 nuclear & particles physics, General Physics and Astronomy, Elementary particle, Parity (physics), Particle Data Group, Symmetry group, 01 natural sciences, Baryon, Nuclear physics, 0103 physical sciences, Higgs boson, Bibliography, Particle, 010306 general physics, Lepton
Abstract

This review of the properties of leptons, mesons, and baryons is an updating of Review of Particle Properties, Particle Data Group [Rev. Mod. Phys. 48 (1976) No. 2, Part II; and Supplement, Phys. Lett. 68B (1977) 1]. Data are evaluated, listed, averaged, and summarized in tables. Numerous tables, figures, and formulae of interest to particle physicists are also included. A data booklet is available.

Published
1980
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18. Review of particle properties: Supplement to 1974 edition

Author

Alan Rittenberg, C. Bricman, Thomas A. Lasinski, Matts Roos, Thomas G Trippe, George P Yost, V. Chaloupka, Angela Barbaro-Galtieri, Robert L Kelly, Arthur H. Rosenfeld, D.M. Chew, Naomi Barash-Schmidt, and Fumiyo Uchiyama

Subjects
Physics, Particle physics, Particle properties, Meson, 010308 nuclear & particles physics, 0103 physical sciences, Bibliography, General Physics and Astronomy, Data compilation, Particle Data Group, 010306 general physics, 01 natural sciences
Abstract

This supplement to the 1974 edition of "Review of Particle Properties," Particle Data Group [Phys. Lett. 50B, No. 1 (1974)], contains an announcement concerning the postponement of the usual Review, a list of Errata, and a tabulation of the experimental results on the newly discovered mesons.

Published
1975
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19. Study of diffractively produced five-pion final states

Author

Frank C. Porter, H. H. Bingham, W.B. Fretter, George P Yost, R. Harris, W.R. Graves, K. Moriyasu, W. J. Podolsky, and Henry Lubatti

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Pion, Deuterium, Mass spectrum, High Energy Physics::Experiment, Statistical model, Nuclear Experiment, Bootstrap model, Dissociation (chemistry)
Abstract

Diffractively produced five-pion final states are studied in the reaction π−d → 3π−2π+d at 15 GeV/c and compared with predictions of the statistical dissociation model and multiperipheral models.

Published
1975
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20. Charge asymmetry in inelastic π−p interactions at 205 GeV/c for particles with transverse momentum > 1.0

Author

D.M. Chew, F. C. Winkelmann, G. H. Trilling, George P Yost, D. Bogert, F. R. Huson, L. Stutte, S. M. Pruss, S. Kahn, R. Hanft, W. Smart, A. D. Johnson, H. H. Bingham, J. A. Kadyk, B.Y. Daugeras, W.R. Graves, W.B. Fretter, and D. Ljung

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, media_common.quotation_subject, Transverse momentum, High Energy Physics::Experiment, Multiplicity (chemistry), Nuclear Experiment, Asymmetry, media_common
Abstract

In 205 GeV / c π − p inelastic interactions, negative particles with transverse momentum greater than 1.0 GeV / c moving forward in the center of mass outnumber similar positive particles by a factor of 3.7 to 1, greatly in excess of the corresponding ratio for small transverse momentum. The asymmetry is reversed in the backward direction. The forward asymmetry is most prominent in 2-, 4-, and 6-prong interactions, but both forward and backward asymmetries are also substantial for higher multiplicity interactions.

Published
1975
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21. Observation of short-lived particles produced in high energy neutrino interactions

Author

D.D. Reeder, R. Benada, G.M. Swider, T. Lawry, T. H. Burnett, R. J. Cence, H. Rudnicka, V. Z. Peterson, W. M. Smart, Henry Lubatti, M. L. Stevenson, M. E. Duffy, George P Yost, G. Harigel, E. E. Schmidt, E. Wolin, G. Lynch, J. Lys, M. W. Peters, M. D. Jones, Ugo Camerini, J. Orthel, H. H. Bingham, W.B. Fretter, R. Loveless, M. Ngai, V. J. Stenger, M.D. Sokoloff, P. McCabe, W. F. Fry, E. Treadwell, F. R. Huson, H. C. Ballagh, K. Moriyasu, D. Gee, L. Fluri, F. A. Harris, D. Holmgren, Bruce L. Chrisman, J. Wolfson, Sherwood Parker, and D. Rees

Subjects
Nuclear physics, Semileptonic decay, Physics, Nuclear and High Energy Physics, Particle physics, Particle decay, Pair production, Meson, D meson, Bubble chamber, High Energy Physics::Experiment, Neutrino, Lepton
Abstract

Examination of a sample of 89 high-energy, neutrino-induced dilepton events produced in the Fermilab 15 ft bubble chamber has resulted in the direct observation of the production and visible semi-leptonic decay of short-lived particles. One charged decay, two neutral decays, and one decay candidate of undetermined charge are found. Assuming these events and the remaining dilepton signal result from D meson decays, we obtain τ D + = 2.5 −1.5 +3.5 × 10 −13 s and τ D 0 = 3.5 −1.7 +3.5 × 10 −13 s, using a maximum likelihood analysis.

Published
1980
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22. Search for Evidence of aΔ(1236)−Δ(1236)Component of the Deuteron

Author

A. Firestone, R. Harris, George P Yost, W.R. Graves, N. D. Pewitt, J. R. Bensinger, W.B. Fretter, C. P. Horne, Frank C. Porter, Sharon Hagopian, Henry Lubatti, Gerson Goldhaber, P. K. Williams, M. Goldhaber, Vasken Hagopian, H. H. Bingham, B. Wind, W. J. Podolsky, and K. Moriyasu

Subjects
Baryon, Physics, Antiparticle, Particle physics, Pion, Meson, Hadron, Bound state, General Physics and Astronomy, Elementary particle, Atomic physics, Boson
Abstract

Evidence for a bound ${\ensuremath{\Delta}}_{33}(1236)\ensuremath{-}{\ensuremath{\Delta}}_{33}(1236)$ component of the deuteron is sought by using ${\ensuremath{\pi}}^{+}$, ${\ensuremath{\pi}}^{\ensuremath{-}}$, and ${K}^{+}$ mesons as probes of nuclear structure. Events are observed which might contain $\ensuremath{\Delta}(1236)$ "spectators" in the breakup of a deuteron in a $\ensuremath{\Delta}\ensuremath{\Delta}$ state. However, other mechanisms may contribute to the signal, and we cannot unambiguously ascribe our events to a $\ensuremath{\Delta}\ensuremath{\Delta}$ contribution in the deuteron. With certain assumptions we obtain an upper limit of \ensuremath{\sim}0.7% for the $\ensuremath{\Delta}\ensuremath{\Delta}$ component of the deuteron.

Published
1974
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23. Charm photoproduction at 20 GeV

Author

A. Woods, F. Ohtani, I. M. Godfrey, A. M. Shapiro, H. Rudnicka, K. Takahashi, I. A. Pless, J. Ballam, J. E. Brau, A. Napier, Akira Yamaguchi, A. V. Bevan, C. Milstene, D. A. Waide, S. Wolbers, W. Cameron, K. Hasegawa, M. J. Harwin, H.O. Cohn, A. H. Rogers, G. P. Gopal, N. Fujiwara, Shlomo Dado, R. K. Yamamoto, J. Shank, C. C. Field, G. E. Kalmus, A. P. T. Palounek, W. D. Walker, T. Sato, W. J. Robertson, H. Sagawa, R. I. Hulsizer, R. N. Diamond, J. J. Goldberg, A. Suzuki, T. Kitagaki, D. P. Kelsey, K. Tamai, T. Glanzman, Y. Yoshimura, C. A. Woods, R. Merenyi, R. Sugahara, H. Yuta, S. J. Sewell, G. Hall, T. Handler, D. C. Colley, H. J. Hargis, J. Schneps, P. J. Dornana, J. Kent, K. Furuno, P. W. Lucas, Alfred Goshaw, R. Gearhart, S. Isacson, David Gershoni, S. Tether, S. Yamashita, Edwin R. Hancock, W. A. Mann, I. Hideta, Vasken Hagopian, R. Miburn, K. Braune, T. Hayashino, S. Noguchi, M. Widgoff, K. C. Moffeit, Aharon Levy, K. Abe, George P Yost, T. C. Bacon, P. Rankin, M. Jobes, W. M. Bugg, D. H. Brick, G. T. Condo, H. H. Bingham, B. Franek, E. Ronat, R. Erickson, J. S. Chima, S. W. O'neale, E. L. Hart, Shuji Tanaka, J. J. Murray, J. E. Lannutti, G. Yekutieli, J. M. Butler, and C. G. Wilkins

Subjects
Nuclear physics, Physics, Particle physics, Particle decay, Angular distribution, Elementary particle, Photon energy, Laser beams
Abstract

Sixty-two charm events have been observed in an exposure of the SLAC Hybrid Facility to a backward scattered laser beam. Based on 22 neutral and 21 charged decays we have measured the charmed-meson lifetimes to be tau/sub D//sup 0/ = (6.8/sub -1.8//sup +2.3/)= x 10/sup -13/ sec, tau/sub D//sup + -/ = (7.4/sub -2.0//sup +2.3/) x 10/sup -13/ sec and their ratio tau/sub D//sup + -//tau0 = 1.1/sub -0.3/ /sup +0.6/. The inclusive charm cross section at a photon energy of 20 GeV has been measured to be 56/sub -/23/sup +24/ nb. Evidence is presented for a non-DD-bar component to charm production, consistent with (35 +- 20)% ..lambda../sub c//sup +/ production and some D/sup asteriskplus-or-minus/ production. We have found no unambiguous F decays.

Published
1984
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24. Inclusive photoproduction of neutral strange particles at 20 GeV

Author

C. Milstene, R. H. Milburn, S. Yamashita, K. Furuno, G. Hall, R. Merenyi, Edwin R. Hancock, W. A. Mann, J. S. Chima, R. Gearhart, S. W. O'neale, T. Handler, Aharon Levy, K. Abe, W. Cameron, A. V. Bevan, F. Ochiai, T. Sato, J. Ballam, K. Braune, H. J. Hargis, K. Takahashi, M. Jobes, P. W. Lucas, H.O. Cohn, J. J. Goldberg, Shlomo Dado, D. H. Brick, G. E. Kalmus, S. Noguchi, T. C. Bacon, Y. Ohtani, T. Kitagaki, H. H. Bingham, B. Franek, R. I. Hulsizer, Akira Yamaguchi, J. M. Butler, W. D. Walker, A. Napier, M. Widgoff, Y. Yoshimura, H. Sagawa, E. S. Hafen, K. C. Moffeit, A. H. Rogers, D. C. Colley, S. Tether, C. A. Woods, A. Suzuki, N. Fujiwara, George P Yost, R. N. Diamond, D. P. Kelsey, E. L. Hart, C. G. Wilkins, J. E. Brau, P. Rankin, H. Yuta, E. Ronat, David Gershoni, P. Haridas, A. M. Shapiro, H. Rudnicka, R. Sugahara, Shuji Tanaka, J. J. Murray, J. Schneps, T. Hayashino, J. Kent, T. Fieguth, J. T. Carroll, J. Shank, A. P. T. Palounek, C. V. Cautis, I. Hideta, G. P. Gopal, R. C. Field, G. T. Condo, R. Erickson, W. M. Bugg, S. Wolbers, R. K. Yamamoto, K. Tamai, Alfred Goshaw, K. Hasegawa, and I. A. Pless

Subjects
Baryon, Physics, Nuclear physics, Particle physics, Antiparticle, Meson, High Energy Physics::Phenomenology, Hadron, Hyperon, Elementary particle, Lambda, Boson
Abstract

We have studied inclusive production of ${K}_{S}^{0}$, $\ensuremath{\Lambda}$, and $\overline{\ensuremath{\Lambda}}$ particles in 20-GeV $\ensuremath{\gamma}p$ interactions and have found features similar to those observed in both hadronic and leptonic interactions. The production cross sections, charged-particle multiplicities, and average $\ensuremath{\Lambda}$ polarization are reported. Inclusive distributions of $x$ and ${p}_{T}$ are shown and discussed in terms of quark fragmentation models. Production cross sections for ${K}^{*}(890)$ and ${\ensuremath{\Sigma}}^{*}(1385)$ are also reported.

Published
1984
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25. Lifetimes, cross sections, and production mechanisms of charmed particles produced by 20-GeV photons

Author

H. J. Hargis, P. Dingus, J. E. Brau, R. C. Field, D. C. Colley, Edwin R. Hancock, W. A. Mann, S. Tanaka, J. Schneps, J. M. Butler, T. Kafka, H. Yuta, A. Napier, James Shank, G. E. Kalmus, J. J. Murray, H. Sagawa, R. H. Milburn, A. M. Shapiro, R. Armenteros, T. C. Bacon, H.O. Cohn, S. Wolbers, D. P. Kelsey, V. R. O’Dell, R. A. Gearhart, C. A. Woods, A. Yamaguchi, K. Abe, J. J. Goldberg, George P Yost, G. Hall, M. Widgoff, T. Kitagaki, E. L. Hart, K. C. Moffeit, S. J. Sewell, D. A. Waide, J. Shimony, W. Cameron, I. M. Godfrey, M. Jobes, K. Braune, K. Tamai, R. Merenyi, G. T. Condo, P. Rankin, R. Erickson, W. M. Bugg, K. Hasegawa, D. H. Brick, H. H. Bingham, B. Franek, J. Ballam, T. Glanzman, and M. J. Harwin

Subjects
Nuclear physics, Physics, Particle physics, Photon, Meson, Hadron, Sigma, Elementary particle, Charm (quantum number), Photon energy, Boson
Abstract

Seventy-one events containing charmed-particle decays have been observed in an experiment using the SLAC Hybrid Facility exposed to a backward-scattered photon beam. Several improvements were made to the apparatus since the previous experiment on charm photoproduction. Results for the charmed-meson lifetimes are consistent with the published results from the previous experiment and the two data samples have been combined yielding a total sample of 136 charm events. After imposing rigorous cuts, 50 neutral, 48 charged, and 2 charged/neutral ambiguous decays remain. From these, the charmed-meson lifetimes are measured to be tau/sub D/ = (8.6 +- 1.3/sub -0.3/ /sup .7/) x 10 T sec, tau/sub D/ = (6.1 +- 0.9 +- 0.3) x 10 T sec, and their ratio tau/sub D/ /tau0 = 1.4 +- 0.3/sub -/ /sub 0.1//sup +0.2/. The total charm cross section at a photon energy of 20 GeV has been measured to be (62 +- 8/sub -/10 V) nb. There is evidence for both DD-barX and D-bar /sub c/ X production with sigma/sub D/ /sub c/ X/sigma/sub charm/ = (71 +- 11 +- 6)%.

Published
1986
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26. ν¯μ- Nucleon Charged-Current Total Cross Section for 5-250 GeV

Author

M. D. Jones, J. Lys, H. H. Bingham, E. E. Schmidt, George P Yost, E. Treadwell, H. C. Ballagh, R. J. Cence, Sherwood Parker, M. W. Peters, G. N. Taylor, M. L. Stevenson, W. M. Smart, V. J. Stenger, F. A. Harris, D. Gee, Vincent Z. Peterson, F. R. Huson, and T. Lawry

Subjects
Physics, Nuclear physics, Neon, Particle physics, Cross section (physics), Hydrogen, chemistry, General Physics and Astronomy, chemistry.chemical_element, Nucleon, Charged current
Published
1983
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27. Pion Diffraction Dissociation in 205-GeV/cπ−pInteractions

Author

C. Pascaud, W. M. Smart, D. Bogert, G. S. Abrams, H. H. Bingham, J. A. Kadyk, F. R. Huson, C. E. Friedberg, D.M. Chew, George P Yost, L. Stutte, F. C. Winkelmann, D. Ljung, G. H. Trilling, S. M. Pruss, G. Goldhaber, R. Hanft, B.Y. Daugeras, A. D. Johnson, W.B. Fretter, and W.R. Graves

Subjects
Diffraction, Nuclear physics, Physics, Particle physics, Pion, Pi, General Physics and Astronomy, Multiplicity (chemistry), Dissociation (chemistry)
Abstract

Author(s): Winkelmann, F.C.; Abrams, G.S.; Bingham, H.H.; Chew, D.M.; Daugeras, B.Y.; Fretter, W.B.; Friedberg, C.E.; Goldhaber, G.; Graves, W.R.; Johnson, A.D.; Kadyk, J.A.; Stutte, L.; Trilling, G.H.; Yost, G.P.; Bogert, D.; Hanft, R.; Huson, F.R.; Ljung, D.; Pascaud, C.; Pruss, S.; Smart, W.M.

Published
1974
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28. Search for a threshold enhancement in theγp→charmed baryon + charmed meson cross section

Author

K. Tamai, B. Franek, H. Yuta, J. M. Butler, P. Dingus, T. C. Bacon, D. C. Colley, R. Merenyi, D. A. Waide, W. Cameron, T. Glanzman, R. Erickson, Geoffrey Hall, J. E. Brau, D. H. Brick, I. A. Pless, H. J. Hargis, H. H. Bingham, Edwin R. Hancock, R. C. Field, R. Gearhart, S. Wolbers, T. Kitagaki, Hiroyuki Sagawa, George P Yost, W. M. Bugg, Kenji Hasegawa, J. Shank, T. Kafka, M. Widgoff, M. J. Harwin, G. E. Kalmus, M. Jobes, Shlomo Dado, R. I. Hulsizer, H.O. Cohn, C. A. Woods, R. K. Yamamoto, J. Shimony, I. M. Godfrey, V. R. O’Dell, P. Rankin, D. P. Kelsey, K. Abe, Aharon Levy, K. Braune, E. Ronat, S. J. Sewell, E. L. Hart, Akira Yamaguchi, Shuji Tanaka, and J. J. Murray

Subjects
Physics, Baryon, Nuclear physics, Particle physics, Cross section (physics), Meson, Branching fraction, Hadron, Elementary particle, Charm (quantum number), Threshold energy
Abstract

Results of a search for a predicted enhancement of several microbarns in the charm-photoproduction cross section just above threshold are reported. No charm decays were detected, from which an upper limit to the charm cross section of 94 nb (90% C.L.) at E/sub ..gamma../approx. =10 GeV was obtained. Upper limits in the range 270 to 450 nb were also obtained for the peak cross sections for threshold enhancements in ..gamma..p..-->..D/sup -/..sigma../sub c//sup + +/ and similar channels.

Published
1984
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29. Forward charge asymmetry in 20-GeV gammap reactions

Author

C. G. Wilkins, D. H. Brick, S. Tether, S. Yamashita, W. D. Walker, P. Dingus, D. C. Colley, R. K. Yamamoto, T. C. Bacon, R. N. Diamond, C. Milstene, I. A. Pless, J. E. Brau, R. I. Hulsizer, R. Sugahara, M. J. Harwin, W. J. Robertson, D. P. Kelsey, P. W. Lucas, H. H. Bingham, C. A. Woods, P. J. Dornan, Edwin R. Hancock, F. Ochiai, A. Yamaguchi, H. O. Cohn, A. Napier, J. Goldberg, K. Braune, Kazuo Hasegawa, D. A. Waide, W. M. Bugg, H. J. Hargis, I. M. Godfrey, S. Noguchi, W. Cameron, T. Kitagaki, T. Handler, J. Kent, M. Widgoff, K. Takahashi, S. Tanaka, Y. Yoshimura, N. Fujiwara, T. Glanzman, R. Armenteros, H. Yuta, G. Hall, V. R. O’Dell, T. Kafka, E. L. Hart, P. Rankin, R. C. Field, K.C. Moffeit, A. Suzuki, A. M. Shapiro, B. Franek, J. M. Butler, W. A. Mann, Aharon Levy, K. Tamai, G. E. Kalmus, S. J. Sewell, T. Sato, S. Wolbers, G. T. Condo, Koji Abe, J. Shank, A. P. T. Palounek, Hiroyuki Sagawa, J. Ballam, R. Merenyi, R. Erickson, R. H. Milburn, A. T. Goshaw, George P Yost, S. W. O'Neale, M. Jobes, J. Schneps, and Shlomo Dado

Subjects
Physics, Particle physics, Photon, Meson, media_common.quotation_subject, Hadron, Elementary particle, Asymmetry, Nuclear physics, symbols.namesake, Pion, symbols, Feynman diagram, High Energy Physics::Experiment, Nuclear Experiment, media_common, Boson
Abstract

Fast forward particles photoproduced in 20-GeV interactions on a hydrogen target are shown to be preferentially positive, the asymmetry increasing with transverse momentum and Feynman x. Evidence is given that this effect is not due to forward-going target fragments. A model in which production from the photon of a forward-going spectator u is preferred over a u-bar, due to a higher probability for interactions of antiquarks with the proton constituents, is shown to be qualitatively consistent with the data.

Published
1987

30. Charm photoproduction cross section at 20 GeV

Author

R. N. Diamond, S. Tether, M. MacDermott, S. Isaacson, H. O. Cohn, E. L. Hart, Kazuo Hasegawa, D. H. Brick, W. D. Walker, R. C. Field, K.C. Moffeit, H. H. Bingham, J. Goldberg, T. Maruyama, H. B. Wald, T. C. Bacon, Yuying Wu, C. A. Woods, N. Fujiwara, H. Yuta, I. A. Pless, Vasken Hagopian, M. Rabin, C. K. Sinclair, P. Haridas, A. M. Shapiro, G. E. Kalmus, J. E. Brau, C. G. Wilkins, J. J. Murray, H. Rudnicka, G. T. Condo, H. J. Hargis, T. Hayashino, J. S. Chima, T. Kitagaki, A. P. T. Palounek, P. Rankin, W. A. Mann, S. Tanaka, Geoffrey Hall, F. Ochiai, Y. Yoshimura, Shlomo Dado, R. Sugahara, Koji Abe, W. Cameron, E. Ronat, J. Kent, D. C. Colley, R. K. Yamamoto, J. T. Carroll, E. Hafen, R. Erickson, A. V. Bevan, James Shank, T. Glanzman, K. Braune, G. P. Gopal, G. Yekutieli, J. Schneps, J. E. Lannutti, C. V. Cautis, K. Tamai, W. M. Bugg, T. Handler, A. Napier, R. Merenyi, D. Q. Huang, R. I. Hulsizer, J. N. Butler, B. Franek, Aharon Levy, S. Noguchi, M. Widgoff, D. P. Kelsey, M. Jobes, C. Milstene, A. T. Goshaw, R. A. Gearhart, George P Yost, S. J. Sewell, L. Berny, S. W. O'Neale, S. Wolbers, A. H. Rogers, T. Sato, J. Ballam, S. Yamashita, T. Fieguth, W. J. Robertson, L.R. Fortney, P. J. Dornan, Edwin R. Hancock, P. W. Lucas, Akira Yamaguchi, R. H. Milburn, A. Suzuki, and K. Takahashi

Subjects
Nuclear physics, Physics, Particle physics, Cross section (physics), Scattering, General Physics and Astronomy, Bubble chamber, Elementary particle, Charm (quantum number), Laser beams, Particle identification, Particle detector, Particle Physics - Experiment
Abstract

Forty-seven charm events have been observed in an exposure of the SLAC Hybrid Facility bubble chamber to a 20-GeV backward-scattered laser beam. Thirty-seven events survive all the necessary cuts imposed. Based on this number the total charm cross section is calculated to be ${63}_{\ensuremath{-}28}^{+33}$ nb.

Published
1983

31. Photoproduction of a New Vector Meson by Linearly Polarized 9.3 GeV Gamma Rays

Author

A.H. Rosenfeld, M. S. Rabin, W.B. Fretter, J. Ballam, Y. Eisenberg, G. Wolf, G.B. Chadwick, G. Smadja, P. Seyboth, H.H. Bingham, K.C. Moffeit, I. O. Skillicorn, W.J. Podolsky, George P Yost, E. Kogan, and H. Spitzer

Subjects
Nuclear physics, Physics, Particle physics, Meson, Linear polarization, Gamma ray, Substructure, Vector meson, Monochromatic color, Beam (structure), Preliminary analysis
Abstract

From a 275 events/μb exposure of the 82″ HBC to the SLAC linearly polarized monochromatic (9.3 GeV) γ beam, our preliminary analysis shows evidence for peripheral [exp (6t)] photoproduction of a JP = 1 −, meson with mass in the 1.5 GeV region, width ≳ 0.4 GeV (M and Γ both model dependent) and σ = 1.7 ± 0.3 μb in the reaction γp ⇒ ρ1 p, ρ1 ⇒ 2π+;2π−. The 4π system shows ρ0π+ π− substructure. Arguments for IG = 1+ are presented from the angular correlations (and the lack of clear evidence for a ρ0ρ0 decay mode).

Published
1972
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32. Review of particle properties

Author

R. H. Schindler, Kenneth G. Hayes, Charles G Wohl, R. M. Barnett, M. Aguilar-Benitez, G.S. Wagman, Thomas G Trippe, G. Höhler, George P Yost, Alan Rittenberg, L D Roper, J. J. Hernandez, Kaoru Hagiwara, D. M. Manley, K. R. Schubert, Ronald R. Ross, Mahiko Suzuki, R. Shrock, S. Kawabata, G. Conforto, B. Armstrong, B Cabrera, F. C. Porter, R L Crawford, Keith A. Olive, Nils A. Tornqvist, R A Eichler, W P Trower, Matts Roos, L. Montanet, G. R. Lynch, and Ian Hinchliffe

Subjects
Physics, Baryon, Nuclear and High Energy Physics, Particle physics, Particle properties, Meson, Bibliography, Table (database), Data compilation, Lepton
Published
1988
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