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1. First observation of the Cabibbo-suppressed decays Ξc+→Σ+π−π+ and Ξc+→Σ−π+π+ and measurement of their branching ratios

Author

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

Subjects
Nuclear physics, Physics, Charmed baryons, Nuclear and High Energy Physics, 010308 nuclear & particles physics, 0103 physical sciences, Fermilab, Atomic physics, 010306 general physics, Branching (polymer chemistry), 01 natural sciences
Abstract

We report the first observation of two Cabibbo-suppressed decay modes, Ξ c + → Σ + π − π + and Ξ c + → Σ − π + π + . We observe 59 ± 14 over a background of 87, and 22 ± 8 over a background of 13 events, respectively, for the signals. The data were accumulated using the SELEX spectrometer during the 1996–1997 fixed target run at Fermilab, chiefly from a 600 GeV / c Σ − beam. The branching ratios of the decays relative to the Cabibbo-favored Ξ c + → Ξ − π + π + are measured to be B ( Ξ c + → Σ + π − π + ) / B ( Ξ c + → Ξ − π + π + ) = 0.48 ± 0.20 , and B ( Ξ c + → Σ − π + π + ) / B ( Ξ c + → Ξ − π + π + ) = 0.18 ± 0.09 , respectively. We also report branching ratios for the same decay modes of the Λ c + relative to Λ c + → p K − π + .

Published
2008
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2. Confirmation of the doubly charmed baryon Ξcc+(3520) via its decay to pD+K−

Author

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

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, Branching fraction, Gaussian, State (functional analysis), Poisson distribution, 01 natural sciences, Nuclear physics, Charmed baryons, Baryon, symbols.namesake, 0103 physical sciences, symbols, Fermilab, Charm (quantum number), 010306 general physics
Abstract

We observe a signal for the doubly charmed baryon Ξ c c + in the decay mode Ξ c c + → p D + K − to complement the previous reported decay Ξ c c + → Λ c + K − π + in data from SELEX, the charm hadroproduction experiment at Fermilab. In this new decay mode we observe an excess of 5.62 events over a combinatoric background estimated by event mixing to be 1.38 ± 0.13 events. The mixed background has Gaussian statistics, giving a signal significance of 4.8σ. The Poisson probability that a background fluctuation can produce the apparent signal is less than 6.4 × 10 −4 . The observed mass of this state is 3518 ± 3 MeV / c 2 , consistent with the published result. Averaging the two results gives a mass of 3518.7 ± 1.7 MeV / c 2 . The observation of this new weak decay mode confirms the previous SELEX suggestion that this state is a double charm baryon. The relative branching ratio for these two modes is 0.36 ± 0.21 .

Published
2005
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3. Upper limit on the decay Σ(1385)−→Σ−γ and cross section for γΣ−→Λπ−

Author

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

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, Hyperon, Radiative decay, Sigma, Lambda, 01 natural sciences, Nuclear physics, Formalism (philosophy of mathematics), 0103 physical sciences, Pi, Fermilab, 010306 general physics, Primakoff effect
Abstract

Coherent Λπ− production on Pb of 600 GeV Σ− hyperons has been studied with the SELEX facility at Fermilab. Using the Primakoff formalism, we set a 90% CL upper limit on the radiative decay width Γ[Σ(1385)−→Σ−γ] s ≈1.385 GeV to be 56±16 μb.

Published
2004
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4. Multi-ring signatures of the oscillation $\nu_\mu \rightarrow \nu_e$ in a water Cherenkov detector

Author

V.S. Kaftanov, A.G. Dolgolenko, V. S. Verebryusov, M. A. Kubantsev, G.V. Davidenko, and A. E. Asratyan

Subjects
Physics, Particle physics, Physics and Astronomy (miscellaneous), Physics::Instrumentation and Detectors, Oscillation, Cherenkov detector, Astrophysics::High Energy Astrophysical Phenomena, High Energy Physics::Phenomenology, Measure (physics), law.invention, Ring signature, law, High Energy Physics::Experiment, Neutrino, Engineering (miscellaneous), Sign (mathematics)
Abstract

Multiring signatures of the oscillation nu_mu --> nu_e are formulated for a water Cherenkov detector. These are appropriate for relatively high neutrino energies (over 2 GeV) that emphasize the matter effect and, therefore, may allow to measure the sign of the atmospheric mass-squared difference.

Published
2003
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5. Production asymmetry of Ds from 600 GeV/c Σ− and π− beam

Author

G. B. Dzyubenko, Murray Moinester, V. A. Prutskoi, A.G. Atamantchouk, K. D. Nelson, V. V. Molchanov, M. Luksys, L.G. Landsberg, E. J. Ramberg, Shuchen Zheng, A. V. Evdokimov, Viktor Matveev, P. Gouffon, A. Kushnirenko, A. P. Nilov, P. Schiavon, M. Gaspero, H. Krüger, R. M. Edelstein, N. P. Kuropatkin, D. V. Vavilov, G. Alkhazov, P. S. Cooper, Vincent J Smith, A. M. F. Endler, C. R. Newsom, A.G. Dolgolenko, Kangling He, A. G. Krivshich, P. V. Neoustroev, Wenheng Zhao, F. G. Garcia, J. Simon, V. P. Kubarovsky, G. F. Rappazzo, I. Konorov, V. E. Vishnyakov, S. B. Nurushev, P. Mathew, Yasar Onel, E. Ozel, V. P. Maleev, Chensheng Mao, I. Eschrich, M. Procario, Lev Uvarov, Suat Ozkorucuklu, Victor Golovtsov, B. V. Razmyslovich, Zhenlin Mao, S. Y. Jun, Victor Kim, L. J. Dauwe, A. Lamberto, Nikolay Terentyev, M. Mattson, A. P. Kozhevnikov, M. Srivastava, Erhan Gülmez, I. Giller, R. Zukanovich-Funchal, D. Mao, K. Vorwalter, E. M. Leikin, Mithat Kaya, J. M. You, James Russ, C.O. Escobar, Yunshan Li, V. S. Verebryusov, D. Skow, E. McCliment, M. Svoiski, V. A. Victorov, A. Ocherashvili, L. Stutte, U. Dersch, A. I. Kulyavtsev, A. Morelos, I. Larin, L. M. Kochenda, Nikolay Bondar, G. P. Thomas, Simon Kwan, J. Lach, A. A. Vorobyov, V. Stepanov, M. A. Kubantsev, L. Emediato, V. I. Rud, M. Iori, M.Y. Balatz, P. Pogodin, V. F. Kurshetsov, S. V. Petrenko, V. Steiner, I.S. Filimonov, J. Kilmer, G.V. Davidenko, Andrey Vasiliev, A.V Nemitkin, Jürgen Engelfried, T. Lungov, Aldo Penzo, A. I. Sitnikov, Ball State University, Bogazici University, Carnegie-Mellon University, Centro Brasileiro de Pesquisas Físicas, Fermi National Accelerator Laboratory, Institute for High Energy Physics, Institute of High Energy Physics, Institute of Theoretical and Experimental Physics, Max-Planck-Institut für Kernphysik, Moscow State University, Petersburg Nuclear Physics Institute, Tel Aviv University, Universidad Autónoma de San Luis Potosí, Universidade Federal da Paraíba (UFPB), University of Bristol, University of Iowa, University of Michigan-Flint, University of Rome 'La Sapienza' and INFN, Universidade de São Paulo (USP), University of Trieste and INFN, Infinion, Imperial College, Universidade Estadual de Campinas (UNICAMP), Kafkas University, Technische Universität München, The Boston Consulting Group, Universidade Estadual Paulista (UNESP), Lucent Technologies, SPSS Inc., University of Alabama at Birmingham, DOE, Solidum, Siemens Medizintechnik, and Deutsche Bank AG

Subjects
Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, media_common.quotation_subject, High Energy Physics::Phenomenology, Function (mathematics), 01 natural sciences, Asymmetry, High Energy Physics - Experiment, Nuclear physics, 0103 physical sciences, Physics::Accelerator Physics, Interval (graph theory), High Energy Physics::Experiment, Production (computer science), 010306 general physics, Beam (structure), media_common
Abstract

The production of $D_s^-$ relative to $D_s^+$ as a function of $x_F $ with 600 GeV/c $\Sigma^-$ beam is measured in the interval $0.15 < x_F < 0.7$ by the SELEX (E781) experiment at Fermilab. The integrated charge asymmetries with 600 GeV/c $\Sigma^-$ beam ($0.53\pm0.06$) and $\pi^-$ beam ($0.06\pm0.11$) are also compared. The results show the $\Sigma^-$ beam fragments play a role in the production of $D_s^-$, as suggested by the leading quark model., Comment: 11 pages, 5 figures, submitted to Physics Letter B

Published
2003
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6. A method for detecting ντ appearance in the spectra of quasielastic CC events

Author

V.S. Kaftanov, A.G. Dolgolenko, G.V. Davidenko, V. S. Verebryusov, A. E. Asratyan, and M. A. Kubantsev

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Muon, Physics::Instrumentation and Detectors, Detector, Physics::Accelerator Physics, High Energy Physics::Experiment, Neutrino, Instrumentation, Spectral line, Cherenkov radiation, High Energy Physics - Experiment
Abstract

A method for detecting the transition \omutau in long-baseline accelerator experiments, that consists in comparing the far-to-near ratios of the spectra of quasielastic CC events generated by high- and low-energy beams of muon neutrinos, is proposed. The test may be accessible to big water Cherenkov detectors and iron--scintillator calorimeters, and is limited by statistics rather than systematics., Comment: 10 pages, 4 figures

Published
2002
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7. Observation of a narrow baryon resonance with positive strangeness formed inK+Xe collisions

Author

G.K. Tumanov, A.G. Dolgolenko, V.V. Barmin, C. Guaraldo, Catalina Curceanu, G.V. Davidenko, V.S. Borisov, N.N. Shishov, M. A. Kubantsev, V.A. Shebanov, L. I. Sokolov, V. S. Verebryusov, Viktor Matveev, V. V. Tarasov, I. Larin, and A. E. Asratyan

Subjects
Mass enhancement, Nuclear physics, Physics, Baryon, Nuclear and High Energy Physics, Effective mass (solid-state physics), Nuclear Theory, Mass spectrum, Neutron, Strangeness, Nuclear Experiment, Pentaquark
Abstract

The charge-exchange reaction K + Xe → K 0 pXeis investigated using the data of the DIANA experiment. The distribution of the pK 0 effective mass shows a promi- nent enhancement near 1538 MeV formed by nearly 80 events above the background, whose width is consistent with being entirely due to the experimental resolution. Under the selections based on a simulation of K + Xe collisions, the statistical signif- icance of the signal reaches 5.5�. We interpret this observation as strong evidence for formation of a pentaquark baryon with positive strangeness, � + (uudd¯), in the charge-exchange reaction K + n → K 0 p on a bound neutron. The mass of the � + baryon is measured as m(� + ) = 1538 ± 2 MeV. Using the ratio between the num- bers of resonant and non-resonant charge-exchange events in the peak region, the intrinsic width of this baryon resonance is determined as ( � + ) = 0.34±0.10 MeV.

Published
2014
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8. Precision Measurements of theΛc+andD0Lifetimes

Author

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

Subjects
Physics, Particle physics, 010308 nuclear & particles physics, Maximum likelihood, Monte Carlo method, General Physics and Astronomy, Elementary particle, Lambda, Lambda baryon, 01 natural sciences, 7. Clean energy, 3. Good health, 0103 physical sciences, Charm (quantum number), Fermilab, 010306 general physics
Abstract

We report new precision measurements of the lifetimes of the {Lambda}{sup +}{sub c} and D{sup 0} from SELEX, the charm hadroproduction experiment at Fermilab. Based upon 1630 {Lambda}{sup +}{sub c} and 10210 D{sup 0} decays we observe lifetimes of {tau}[{Lambda}{sup +}{sub c}]=198.1{+-} 7.0{+-}5.6 fs and {tau}[D{sup 0}]=407.9{+-}6.0{+-}4 .3 fs .

Published
2001
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9. Emulsion chamber with big radiation length for detecting neutrino oscillations

Author

M. A. Kubantsev, A.G. Dolgolenko, A. E. Asratyan, V. S. Verebryusov, V.S. Kaftanov, and G.V. Davidenko

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Muon, Spectrometer, Physics::Instrumentation and Detectors, FOS: Physical sciences, Radiation length, Charged particle, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), High Energy Physics::Experiment, Nuclear emulsion, Neutrino, Nuclear Experiment, Neutrino oscillation, Instrumentation, Lepton
Abstract

A conceptual scheme of a hybrid-emulsion spectrometer for investigating various channels of neutrino oscillations is proposed. The design emphasizes detection of $\tau$ leptons by detached vertices, reliable identification of electrons, and good spectrometry for all charged particles and photons. A distributed target is formed by layers of low-Z material, emulsion-plastic-emulsion sheets, and air gaps in which $\tau$ decays are detected. The tracks of charged secondaries, including electrons, are momentum-analyzed by curvature in magnetic field using hits in successive thin layers of emulsion. The $\tau$ leptons are efficiently detected in all major decay channels, including \xedec. Performance of a model spectrometer, that contains 3 tons of nuclear emulsion and 20 tons of passive material, is estimated for different experimental environments. When irradiated by the $\nu_\mu$ beam of a proton accelerator over a medium baseline of $ \sim 1$ km/GeV, the spectrometer will efficiently detect either the \omutau and \omue transitions in the mass-difference region of $\Delta m^2 \sim 1$ eV$^2$, as suggested by the results of LSND. When exposed to the neutrino beam of a muon storage ring over a long baseline of $ \sim$ 10-20 km/GeV, the model detector will efficiently probe the entire pattern of neutrino oscillations in the region $\Delta m^2 \sim 10^{-2}-10^{-3}$ eV$^2$, as suggested by the data on atmospheric neutrinos., Comment: 34 pages, 8 figures

Published
2000
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10. 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
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11. Detecting the (quasi-) two-body decays of leptons in short-baseline neutrino oscillation experiments

Author

M.Y. Balatz, G. Tzanakos, J. Musser, A. E. Asratyan, C. Rosenfeld, G.V. Davidenko, G. B. Dzyubenko, V. E. Vishnyakov, N. W. Reay, M. A. Kubantsev, N. R. Stanton, D. J. Boehnlein, S. Childres, V. S. Verebryusov, R. P. Thun, V.S. Kaftanov, and A.G. Dolgolenko

Subjects
Physics, Nuclear and High Energy Physics, Sequence, Particle physics, Physics::Instrumentation and Detectors, Detector, Charged particle, High Energy Physics - Experiment, Magnetic field, Domain (ring theory), High Energy Physics::Experiment, Neutrino, Neutrino oscillation, Instrumentation, Lepton
Abstract

Novel detector schemes are proposed for the short-baseline neutrino experiments of next generation, aimed at exploring the large-$\Delta m^2$ domain of \omutau oscillations in the appearance mode. These schemes emphasize good spectrometry for charged particles and for electromagnetic showers and efficient reconstruction of \ypi_gg decays. The basic elements are a sequence of relatively thin emulsion targets, immersed in magnetic field and interspersed with electronic trackers, and a fine-grained electromagnetic calorimeter built of lead glass. These elements act as an integral whole in reconstructing the electromagnetic showers. This conceptual scheme shows good performance in identifying the $\tau$ (quasi-)two-body decays by their characteristic kinematics and in selecting the electronic decays of the $\tau$., Comment: 34 pages, 8 figures

Published
1999
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12. Polarization ofΣ+hyperons produced by 800 GeV/c protons on Cu and Be

Author

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

Subjects
Physics, Nuclear and High Energy Physics, Proton radiation, Quantitative Biology::Neurons and Cognition, Hyperon, Atomic physics, Polarization (waves)
Abstract

We show that ${\ensuremath{\Sigma}}^{+}$ hyperons produced by 800 GeV/c protons on targets of Be and Cu have significant polarizations (15--20%). These polarizations persist at values of ${p}_{t}\ensuremath{\approx}2\text{ }\text{ }\mathrm{G}\mathrm{e}\mathrm{V}/\mathrm{c}$ and a wide range of ${x}_{F}$. The polarizations from the Cu target are consistently less than from Be. The average ratio of the ${\ensuremath{\Sigma}}^{+}$ polarization from Cu to that from Be is $0.68\ifmmode\pm\else\textpm\fi{}0.08$.

Published
2004
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13. Observation of a Narrow Charm-Strange MesonDsJ+(2632)→Ds+ηandD0K+

Author

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

Subjects
Physics, Particle physics, Meson, 010308 nuclear & particles physics, Branching fraction, General Physics and Astronomy, 01 natural sciences, Nuclear physics, 0103 physical sciences, High Energy Physics::Experiment, Fermilab, Charm (quantum number), Nuclear Experiment, 010306 general physics
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 is

Published
2004
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14. 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
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15. First Observation of the Doubly Charmed BaryonΞcc+

Author

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

Subjects
Physics, Particle physics, Meson, 010308 nuclear & particles physics, Hyperon, General Physics and Astronomy, Lambda baryon, 7. Clean energy, 01 natural sciences, Xi baryon, Charmed baryons, Baryon, Nuclear physics, Particle decay, Pion, 0103 physical sciences, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics
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
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16. 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

17. Precision measurements of the lambda(+)(c) and D0 lifetimes

Author

A, Kushnirenko, 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, 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, H, 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, S, Kwan, J, Lach, A, Lamberto, L G, Landsberg, I, Larin, E M, Leikin, L, Yunshan, M, Luksys, T, Lungov, V P, Maleev, D, Mao, M, Chensheng, M, 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, 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, Z, Wenheng, Z, Shuchen, and R, Zukanovich-Funchal

Abstract

We report new precision measurements of the lifetimes of the Lambda(+)(c) and D0 from SELEX, the charm hadroproduction experiment at Fermilab. Based upon 1630 Lambda(+)(c) and 10 210 D0 decays we observe lifetimes of tau[Lambda(+)(c)] = 198.1+/-7.0+/-5.6 fs and tau[D0] = 407.9+/-6.0+/-4.3 fs.

Published
2000

18. Observation of the Cabibbo-Suppressed Decay Ξ_{c}^{+} → 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, 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

Abstract

We report the first observation of the Cabibbo-suppressed charm baryon decay Ξ_{c}^{+}→pK^{-}π^{+}. 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 Σ^{-} beam. The branching fractions of the decay relative to the Cabibbo-favored Ξ_{c}^{+}→Σ^{+}K^{-}π^{+} and Ξ_{c}^{+}→Ξ^{-}π^{+}π^{+} are measured to be B(Ξ_{c}^{+}→pK^{-}π^{+})/B(Ξ_{c}^{+}→Σ^{+}K^{-}π^{+})=0.22±0.06±0.03 and B(Ξ_{c}^{+}→pK^{-}π^{+})/B(Ξ_{c}^{+}→Ξ^{-}π^{+}π^{+})=0.20±0.04±0.02, respectively.

Published
1999

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