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1. Observation of the Cabibbo-Suppressed DecayΞc+→pK−π+

Author

S. Y. Jun, N. Akchurin, V. A. Andreev, A. G. Atamantchouk, M. Aykac, M. Y. Balatz, N. F. Bondar, A. Bravar, P. S. Cooper, L. J. Dauwe, G. V. Davidenko, U. Dersch, A. G. Dolgolenko, D. Dreossi, G. B. Dzyubenko, R. Edelstein, L. Emediato, A. M. F. Endler, J. Engelfried, I. Eschrich, C. O. Escobar, A. V. Evdokimov, I. S. Filimonov, F. G. Garcia, M. Gaspero, S. Gerzon, I. Giller, V. L. Golovtsov, Y. M. Goncharenko, E. Gottschalk, P. Gouffon, O. A. Grachov, E. Gülmez, M. Iori, A. D. Kamenski, H. Kangling, M. Kaya, J. Kilmer, V. T. Kim, L. M. Kochenda, K. Königsmann, I. Konorov, A. A. Kozhevnikov, A. G. Krivshich, H. Krüger, M. A. Kubantsev, V. P. Kubarovsky, A. I. Kulyavtsev, N. P. Kuropatkin, V. F. Kurshetsov, A. Kushnirenko, S. Kwan, J. Lach, A. Lamberto, L. G. Landsberg, I. Larin, E. M. Leikin, M. Luksys, T. Lungov, D. Magarrel, V. P. Maleev, D. Mao, S. Masciocchi, P. Mathew, M. Mattson, V. Matveev, E. McCliment, S. L. McKenna, M. A. Moinester, V. V. Molchanov, A. Morelos, V. A. Mukhin, K. D. Nelson, A. V. Nemitkin, P. V. Neoustroev, C. Newsom, A. P. Nilov, S. B. Nurushev, A. Ocherashvili, G. Oleynik, Y. Onel, E. Ozel, S. Ozkorucuklu, S. Patrichev, A. Penzo, S. I. Petrenko, P. Pogodin, B. Povh, M. Procario, V. A. Prutskoi, E. Ramberg, G. F. Rappazzo, B. V. Razmyslovich, V. I. Rud, J. Russ, P. Schiavon, V. K. Semyatchkin, J. Simon, A. I. Sitnikov, D. Skow, V. J. Smith, M. Srivastava, V. Steiner, V. Stepanov, L. Stutte, M. Svoiski, N. K. Terentyev, G. P. Thomas, L. N. Uvarov, A. N. Vasiliev, D. V. Vavilov, V. S. Verebryusov, V. A. Victorov, V. E. Vishnyakov, A. A. Vorobyov, K. Vorwalter, Z. Wenheng, J. You, L. Yunshan, M. Zhenlin, L. Zhigang, and R. Zukanovich Funchal

Subjects
Physics, Meson, 010308 nuclear & particles physics, Stereochemistry, Branching fraction, General Physics and Astronomy, 01 natural sciences, Xi baryon, Sigma baryon, Nuclear physics, Baryon, Charmed baryons, Particle decay, 0103 physical sciences, Pi, 010306 general physics
Abstract

We report the first observation of the Cabibbo-suppressed charm baryon decay Xi(+)(c)-->pK(-)pi(+). We observe 150+/-22+/-5 events for the signal. The data were accumulated using the SELEX spectrometer during the 1996-1997 fixed target run at Fermilab, chiefly from a 600 GeV/c Sigma(-) beam. The branching fractions of the decay relative to the Cabibbo-favored Xi(+)(c)-->Sigma+K-pi(+) and Xi(+)(c)-->Xi(-)pi(+)pi(+) are measured to be B(Xi(+)(c)-->pK(-)pi(+))/B(Xi(+)(c)-->Sigma+K-pi(+)) = 0.22+/-0. 06+/-0.03 and B(Xi(+)(c)-->pK(-)pi(+))/B(Xi(+)(c)-->Xi(-)pi(+)pi(+)) = 0.20+/-0.04+/-0.02, respectively.

Published
2000

2. Measuring the magnetic moments of short-lived particles using channeling in bent crystals

Author

P. S. Cooper, S. Timm, N. K. Terentyev, D. Chen, D.C. Daniels, A. A. Vorobyov, R.A. Carrigan, V.M. Samsonov, M.N. Strikhanov, V. V. Baublis, A. Khanzadeev, J. Lach, A. Morelos, Vincent J Smith, and C.R. Sun

Subjects
Physics, Nuclear and High Energy Physics, Magnetic moment, media_common.quotation_subject, Bent molecular geometry, Hyperon, Asymmetry, Baryon, Nuclear physics, Precession, Charm (quantum number), Nuclear Experiment, Instrumentation, Spin-½, media_common
Abstract

A recent demonstration of spin precession using channeling in a bent crystal offers the interesting possibility of a technique to measure magnetic moments of short-lived charm baryons. There are significant differences among theoretical models of these moments. Accumulating experimental evidence indicates the tools used for hyperon magnetic moment measurements, polarized production and decay asymmetries, may also be available with heavier baryons. Useful measurements may be possible using the channeling technique but they will require challenging beam conditions.

Published
1994

3. Polarization ofΣ+and Σ¯−hyperons produced by 800-GeV/cprotons

Author

P. Gouffon, M. Foucher, M. Luksys, V.A. Schegelsky, A. V. Dobrovolsky, Li Yunshan, Zhao Wenheng, Zheng Shuchen, I. I. Tkatch, Lang Pengfei, Yan Jie, Vincent J Smith, J. Lach, N. P. Kuropatkin, V. T. Grachev, J. R. P. Mahon, Tang Fukun, A. M. F. Endler, Dai Lisheng, H. Gottschalk, Shi Huanzhang, A. A. Vorobyov, N. K. Terentyev, A. V. Khanzadeev, M. A. Kubantsev, A. S. Denisov, V. M. Samsonov, E. McCliment, A. Morelos, S. Timm, R.A. Carrigan, Zhong Yuanyuan, D Chen, T. Dubbs, V. L. Golovtsov, I. F. Albuquerque, Li Chengze, L. N. Uvarov, M. C. Pommot Maia, N. F. Bondar, Carlos Escobar, P. S. Cooper, and C. R. Newsom

Subjects
Physics, Hyperon, General Physics and Astronomy, Sigma, High Energy Physics::Experiment, Elementary particle, Atomic physics, Nuclear Experiment, Polarization (waves), Sigma baryon
Abstract

We have measured the polarization of 375-GeV/c SIGMA+ and SIGMABAR- hyperons produced by 800-GeV/c protons incident on a Cu target. We find that the SIGMA+ polarization rises with increasing p(t) to a maximum of 16% at p(t) = 1.0 GeV/c and then decreases to 10% at p(t) = 1.8 GeV/c. We compare this SIGMA+ polarization with data at lower energies. The SIGMABAR- polarization has been measured for the first time. It has the same sign as the SIGMA+ but smaller magnitude in a similar kinematical region.

Published
1993

4. Observation of a narrow charm-strange meson D-sJ(+)(2632)-> D-s(+)eta and (DK+)-K-0

Author

A V, Evdokimov, U, Akgun, G, Alkhazov, J, Amaro-Reyes, A G, Atamantchouk, A S, Ayan, M Y, Balatz, N F, Bondar, P S, Cooper, L J, Dauwe, G V, Davidenko, U, Dersch, A G, Dolgolenko, G B, Dzyubenko, R, Edelstein, L, Emediato, A M F, Endler, J, Engelfried, I, Eschrich, C O, Escobar, I S, Filimonov, F G, Garcia, M, Gaspero, I, Giller, V L, Golovtsov, P, Gouffon, E, Gülmez, He, Kangling, M, Iori, S Y, Jun, M, Kaya, J, Kilmer, V T, Kim, L M, Kochenda, I, Konorov, A P, Kozhevnikov, A G, Krivshich, H, Krüger, M A, Kubantsev, V P, Kubarovsky, A I, Kulyavtsev, N P, Kuropatkin, V F, Kurshetsov, A, Kushnirenko, S, Kwan, J, Lach, A, Lamberto, L G, Landsberg, I, Larin, E M, Leikin, Li, Yunshan, M, Luksys, T, Lungov, V P, Maleev, D, Mao, Mao, Chensheng, Mao, Zhenlin, P, Mathew, M, Mattson, V, Matveev, E, McCliment, M A, Moinester, V V, Molchanov, A, Morelos, K D, Nelson, A V, Nemitkin, P V, Neoustroev, C, Newsom, A P, Nilov, S B, Nurushev, A, Ocherashvili, Y, Onel, E, Ozel, S, Ozkorucuklu, A, Penzo, S V, Petrenko, P, Pogodin, M, Procario, E, Ramberg, G F, Rappazzo, B V, Razmyslovich, V I, Rud, J, Russ, P, Schiavon, J, Simon, A I, Sitnikov, D, Skow, V J, Smith, M, Srivastava, V, Steiner, V, Stepanov, L, Stutte, M, Svoiski, N K, Terentyev, G P, Thomas, I, Torres, L N, Uvarov, A N, Vasiliev, D V, Vavilov, E, Vázquez-Jáuregui, V S, Verebryusov, V A, Victorov, V E, Vishnyakov, A A, Vorobyov, K, Vorwalter, J, You, Zhao, Wenheng, Zheng, Shuchen, and R, Zukanovich-Funchal

Abstract

We report the first observation of a charm-strange meson D(+)(sJ)(2632) at a mass of 2632.5+/-1.7 MeV/c(2) in data from SELEX, the charm hadro-production experiment E781 at Fermilab. This state is seen in two decay modes, D(+)(s)eta and D0K+. In the D(+)(s)eta decay mode we observe a peak with 101 events over a combinatoric background of 54.9 events at a mass of 2635.4+/-3.3 MeV/c(2). There is a corresponding peak of 21 events over a background of 6.9 at 2631.5+/-2.0 MeV/c(2) in the decay mode D0K+. The decay width of this state is17 MeV/c(2) at 90% confidence level. The relative branching ratio Gamma(D0K+)/Gamma(D(+)(s)eta) is 0.14+/-0.06. The mechanism that keeps this state narrow is unclear. Its decay pattern is also unusual, being dominated by the D(+)(s)eta decay mode.

Published
2004

5. New upper limit for the branching ratio of theΩ−→Ξ−γ radiative decay

Author

T. Dubbs, Shi Huanzhang, D Chen, N. K. Terentyev, Tkatch, I. F. Albuquerque, E. McCliment, L. N. Uvarov, Lang Pengfei, P. Gouffon, R.A. Carrigan, Alexei Khanzadeev, J. Lach, A. S. Denisov, Zhao Wenheng, Tang Fukun, A. M. F. Endler, H. Gottschalk, Mcp Maia, Zheng Shuchen, M. Luksys, V.A. Schegelsky, A. V. Dobrovolsky, An.A. Vorobyov, Carlos Escobar, A. Morelos, N. F. Bondar, Mahon, M. A. Kubantsev, Dai Lisheng, V. L. Golovtsov, V. M. Samsonov, Li Chengze, Li Yunshan, M. Foucher, Vincent J Smith, Yan Jie, P. S. Cooper, C. R. Newsom, N. P. Kuropatkin, V. T. Grachev, Zhong Yuanyuan, and S. Timm

Subjects
Physics, Particle physics, Proton, Branching fraction, Hyperon, Radiative decay, Omega, Nuclear physics, Physics::Accelerator Physics, High Energy Physics::Experiment, Limit (mathematics), Fermilab, Nuclear Experiment, Beam (structure)
Abstract

We have searched for the rare hyperon radiative decay Omega- to Xi- gamma, using the Fermilab Proton Center 375 GeV/c charged hyperon beam. Our measurement of the Omega- beam fraction at 13.6 m from production is (4.8 +_ 0.4)10**(-5). No signal was found and we determine a new upper limit of (4.6 x 10**-4) at 90% CL for the Omega- to Xi- gamma branching ratio.

Published
1994

6. First measurement ofπ−e→π−eγpion virtual compton scattering

Author

A. Ocherashvili, G. Alkhazov, A. G. Atamantchouk, M. Y. Balatz, N. F. Bondar, P. S. Cooper, L. J. Dauwe, G. V. Davidenko, U. Dersch, A. G. Dolgolenko, G. B. Dzyubenko, R. Edelstein, L. Emediato, A. M. F. Endler, J. Engelfried, I. Eschrich, C. O. Escobar, A. V. Evdokimov, I. S. Filimonov, F. G. Garcia, M. Gaspero, I. Giller, V. L. Golovtsov, P. Gouffon, E. Gülmez, He Kangling, M. Iori, S. Y. Jun, M. Kaya, J. Kilmer, V. T. Kim, L. M. Kochenda, I. Konorov, A. P. Kozhevnikov, A. G. Krivshich, H. Krüger, M. A. Kubantsev, V. P. Kubarovsky, A. I. Kulyavtsev, N. P. Kuropatkin, V. F. Kurshetsov, A. Kushnirenko, S. Kwan, J. Lach, A. Lamberto, L. G. Landsberg, I. Larin, E. M. Leikin, Li Yunshan, M. Luksys, T. Lungov, V. P. Maleev, D. Mao, Mao Chensheng, Mao Zhenlin, P. Mathew, M. Mattson, V. Matveev, E. McCliment, M. A. Moinester, V. V. Molchanov, A. Morelos, K. D. Nelson, A. V. Nemitkin, P. V. Neoustroev, C. Newsom, A. P. Nilov, S. B. Nurushev, Y. Onel, E. Ozel, S. Ozkorucuklu, A. Penzo, S. I. Petrenko, P. Pogodin, B. Pouh, M. Procario, V. A. Prutskoi, E. Ramberg, G. F. Rappazzo, B. V. Razmyslovich, V. I. Rud, J. Russ, P. Schiavon, J. Simon, A. I. Sitnikov, D. Skow, V. J. Smith, M. Srivastava, V. Steiner, V. Stepanov, L. Stutte, M. Svoiski, N. K. Terentyev, G. P. Thomas, L. N. Uvarov, A. N. Vasiliev, D. V. Vavilov, V. S. Verebryusov, V. A. Victorov, V. E. Vishnyakov, A. A. Vorobyov, K. Vorwalter, J. You, Zhao Wenheng, Zheng Shuchen, and R. Zukanovich-Funchal

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Chiral perturbation theory, 010308 nuclear & particles physics, Monte Carlo method, Compton scattering, Sigma, Electron, 01 natural sciences, Nuclear physics, Cross section (physics), Pion, 0103 physical sciences, High Energy Physics::Experiment, Fermilab, 010306 general physics
Abstract

Pion virtual compton scattering (VCS) via the reaction pi(-)e-->pi(-)egamma was observed in the Fermilab E781 SELEX experiment. SELEX used a 600 GeV/c pi(-) beam incident on target atomic electrons, detecting the incident pi(-) and the final state pi(-), electron and gamma. Theoretical predictions based on chiral perturbation theory are incorporated into a Monte Carlo simulation of the experiment and are compared to the data. The number of reconstructed events (=9) and their distribution with respect to the kinematic variables (for the kinematic region studied) are in reasonable accord with the predictions. The corresponding pi(-) VCS experimental cross section is sigma=38.8+/-13 nb, in agreement with the theoretical expectation of sigma=34.7 nb.

Published
2002

7. First observation of the doubly charmed baryon Xi(+)(cc)

Author

M, Mattson, G, Alkhazov, A G, Atamantchouk, M Y, Balatz, N F, Bondar, P S, Cooper, L J, Dauwe, G V, Davidenko, U, Dersch, A G, Dolgolenko, G B, Dzyubenko, R, Edelstein, L, Emediato, A M F, Endler, J, Engelfried, I, Eschrich, C O, Escobar, A V, Evdokimov, I S, Filimonov, F G, Garcia, M, Gaspero, I, Giller, V L, Golovtsov, P, Gouffon, E, Gülmez, He, Kangling, M, Iori, S Y, Jun, M, Kaya, J, Kilmer, V T, Kim, L M, Kochenda, I, Konorov, A P, Kozhevnikov, A G, Krivshich, H, Krüger, M A, Kubantsev, V P, Kubarovsky, A I, Kulyavtsev, N P, Kuropatkin, V F, Kurshetsov, A, Kushnirenko, S, Kwan, J, Lach, A, Lamberto, L G, Landsberg, I, Larin, E M, Leikin, Li, Yunshan, M, Luksys, T, Lungov, V P, Maleev, D, Mao, Mao, Chensheng, Mao, Zhenlin, P, Mathew, V, Matveev, E, McCliment, M A, Moinester, V V, Molchanov, A, Morelos, K D, Nelson, A V, Nemitkin, P V, Neoustroev, C, Newsom, A P, Nilov, S B, Nurushev, A, Ocherashvili, E, Oliveira, Y, Onel, E, Ozel, S, Ozkorucuklu, A, Penzo, S V, Petrenko, P, Pogodin, M, Procario, V A, Prutskoi, E, Ramberg, G F, Rappazzo, B V, Razmyslovich, V I, Rud, J, Russ, P, Schiavon, J, Simon, A I, Sitnikov, D, Skow, V J, Smith, M, Srivastava, V, Steiner, V, Stepanov, L, Stutte, M, Svoiski, N K, Terentyev, G P, Thomas, L N, Uvarov, A N, Vasiliev, D V, Vavilov, V S, Verebryusov, V A, Victorov, V E, Vishnyakov, A A, Vorobyov, K, Vorwalter, J, You, Zhao, Wenheng, Zheng, Shuchen, and R, Zukanovich-Funchal

Abstract

We observe a signal for the doubly charmed baryon Xi(+)(cc) in the charged decay mode Xi(+)(cc)--Lambda(+)(c)K-pi(+) in data from SELEX, the charm hadroproduction experiment at Fermilab. We observe an excess of 15.9 events over an expected background of 6.1+/-0.5 events, a statistical significance of 6.3sigma. The observed mass of this state is 3519+/-1 MeV/c(2). The Gaussian mass width of this state is 3 MeV/c(2), consistent with resolution; its lifetime is less than 33 fs at 90% confidence.

Published
2002

8. A Search for Light Super Symmetric Baryons

Author

M. C. Pommot Maia, N. F. Bondar, I. F. Albuquerque, L. N. Uvarov, J. R. P. Mahon, P. S. Cooper, J. Lach, A. Morelos, WH Zhao, C. R. Newsom, J. Langland, An.A. Vorobyov, I. I. Tkatch, Vincent J Smith, Dai Lisheng, M. Foucher, A. M. F. Endler, T. Dubbs, H. Gottschalk, M. Luksys, V.A. Schegelsky, A. S. Denisov, V. L. Golovtsov, Carlos Escobar, Chloe Li, SC Zheng, N. K. Terentyev, A. V. Khanzadeev, J. Yan, A. V. Dobrovolsky, E. McCliment, R.A. Carrigan, F. Tang, Yanhong Li, PF Lang, M. A. Kubantsev, S. Timm, HZ Shi, N. P. Kuropatkin, V. T. Grachev, P. Gouffon, D. Chen, YY Zhong, and V. M. Samsonov

Subjects
Physics, Nuclear reaction, Particle physics, Proton, Hadron, Hyperon, FOS: Physical sciences, General Physics and Astronomy, Elementary particle, Charged particle, High Energy Physics - Experiment, Baryon, High Energy Physics - Experiment (hep-ex), Crystallography, High Energy Physics - Phenomenology, High Energy Physics - Phenomenology (hep-ph), Production (computer science)
Abstract

We have searched for the production and decay of light super-symmetric baryons produced in 800 GeV/c proton copper interactions in a charged hyperon beam experiment. We observe no evidence for the decays R+(uud \g^~) -> S(uds \g^~) pi+ and X-(ssd \g^~) -> S(uds \g^~) pi- in the predicted parent mass and lifetime ranges of 1700-2500 Mev/c2 and 50-500 ps. Production upper limits for R+ at xF=0.47, Pt=1.4 GeV/c2 and X- at xF=0.48, Pt=0.65 GeV/c2 of less than 10^-3 of all charged secondary particles produced are obtained for all but the highest masses and shortest lifetimes predicted., 9 pages, uuencoded postscript 4 figures uuencoded, tar-compressed file (submitted to PRL)

Published
1996

9. Small angle pp scattering at energies from 650 to 1000 MeV

Author

Y. Terrien, N. K. Terentyev, E.M. Maev, G.L. Sokolov, An.A. Vorobyov, G.A. Korolev, A. V. Dobrovolsky, Yu. K. Zalite, V.I. Medvedev, Alexei Khanzadeev, and G.N. Velichko

Subjects
Diffraction, Nuclear physics, Elastic scattering, Physics, Nuclear and High Energy Physics, Recoil, Scattering, Momentum transfer, Scattering length, Atomic physics, Inelastic scattering, Nuclear Experiment, Kinetic energy
Abstract

Received 14 June 1982 (Revised 19 November 1982) Absolute differential cross sections for pp elastic scattering have been measured at kinetic energies of 648, 746, 795, 843, 892, 942 and 992 MeV and for momentum transfer 0.006 < Itl < 0.040 (GeV/c) 2. Both scattered and recoil protons were detected in coincidence. The slope parameters of the diffraction cone and the contribution of the spin-spin amplitudes to forward elastic pp scattering were determined.

Published
1983

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