Search for the pentaquark candidate $\Theta^+$(1540) in the hyperon beam experiment WA89

Adamovich, M.I.; Rudolph, H.; Ren, Z.; Newsom, C.; Baranov, S.P.; Berat, C.; Siebert, H.W.; Pochodzalla, J.; Barberis, D.; Chauvin, J.; Werding, R.; Beusch, W.; Martens, K.; Hurst, R.B.; Alexandrov, Yu.A.; Scheel, C.; Michaels, R.; Zavertyaev, M.V.; Volkemer, B.; Chudakov, E.A.; Neeb, H.; Wittmann, E.; Thilmann, O.; Buscher, C.; Schmitt, L.; Dropmann, F.; Dersch, U.; Fournier, A.; Smith, V.J.; Masciocchi, S.; Rossi, L.; Grafstrom, P.; Konorov, I.; Charignon, F.; Busch, C.; Simon, A.; Ransome, R.; Haller, Th.; Boss, M.; Rey-Campagnolle, M.; Beck, M.; Engelfried, J.; Vorwalter, K.; Paul, S.; Konigsmann, K.; Walder, G.; Brons, S.; Povh, B.; Walcher, Th.; Bruckner, W.; Rosner, G.; Gerassimov, S.G.; Hubbard, E.; Trombini, A.; Godbersen, M.; Potashnikova, I.; Martin, Ph.; Vesin, E.; Muller, U.; Heidrich, M.; Faller, F.; Keller, N.; Newbold, D.; Buenerd, M.

doi:10.1103/PhysRevC.72.055201

Article
Report number	hep-ex/0510013
Title	Search for the pentaquark candidate $\Theta^+$(1540) in the hyperon beam experiment WA89
Author(s)	Adamovich, M.I. (Lebedev Inst.) ; Alexandrov, Yu.A. (Lebedev Inst.) ; Baranov, S.P. (Lebedev Inst.) ; Barberis, D. (INFN, Genoa) ; Beck, M. (Heidelberg, Max Planck Inst.) ; Berat, C. (Grenoble, CEN) ; Beusch, W. (CERN) ; Boss, M. (Heidelberg U.) ; Brons, S. (Heidelberg, Max Planck Inst.) ; Bruckner, W. (Heidelberg, Max Planck Inst.) ; Buenerd, M. (Grenoble, CEN) ; Busch, C. (Heidelberg U.) ; Buscher, C. (Heidelberg, Max Planck Inst.) ; Charignon, F. (Grenoble, CEN) ; Chauvin, J. (Grenoble, CEN) ; Chudakov, E.A. (Heidelberg U.) ; Dersch, U. (Heidelberg, Max Planck Inst.) ; Dropmann, F. (Heidelberg, Max Planck Inst.) ; Engelfried, J. (Heidelberg U.) ; Faller, F. (Heidelberg U.) ; Fournier, A. (Grenoble, CEN) ; Gerassimov, S.G. (Heidelberg, Max Planck Inst. ; Lebedev Inst.) ; Godbersen, M. (Heidelberg, Max Planck Inst.) ; Grafstrom, P. (CERN) ; Haller, Th. (Heidelberg, Max Planck Inst.) ; Heidrich, M. (Heidelberg, Max Planck Inst.) ; Hubbard, E. (Heidelberg, Max Planck Inst.) ; Hurst, R.B. (INFN, Genoa) ; Konigsmann, K. (Heidelberg, Max Planck Inst.) ; Konorov, I. (Heidelberg, Max Planck Inst. ; Lebedev Inst.) ; Keller, N. (Heidelberg U.) ; Martens, K. (Heidelberg U.) ; Martin, Ph. (Grenoble, CEN) ; Masciocchi, S. (Heidelberg, Max Planck Inst.) ; Michaels, R. (Heidelberg, Max Planck Inst.) ; Muller, U. (Mainz U.) ; Neeb, H. (Heidelberg, Max Planck Inst.) ; Newbold, D. (Bristol U.) ; Newsom, C. (Iowa U.) ; Paul, S. (Heidelberg, Max Planck Inst.) ; Pochodzalla, J. (Heidelberg, Max Planck Inst.) ; Potashnikova, I. (Heidelberg, Max Planck Inst.) ; Povh, B. (Heidelberg, Max Planck Inst.) ; Ransome, R. (Rutgers U., Piscataway) ; Ren, Z. (Heidelberg, Max Planck Inst.) ; Rey-Campagnolle, M. (Grenoble, CEN) ; Rosner, G. (Mainz U.) ; Rossi, L. (INFN, Genoa) ; Rudolph, H. (Mainz U.) ; Scheel, C. (NIKHEF, Amsterdam) ; Schmitt, L. (Mainz U.) ; Siebert, H.W. (Heidelberg U.) ; Simon, A. (Heidelberg U.) ; Smith, V.J. (Bristol U.) ; Thilmann, O. (Heidelberg U.) ; Trombini, A. (Heidelberg, Max Planck Inst.) ; Vesin, E. (Grenoble, CEN) ; Volkemer, B. (Mainz U.) ; Vorwalter, K. (Heidelberg, Max Planck Inst.) ; Walcher, Th. (Mainz U.) ; Walder, G. (Heidelberg U.) ; Werding, R. (Heidelberg, Max Planck Inst.) ; Wittmann, E. (Heidelberg, Max Planck Inst.) ; Zavertyaev, M.V. (Lebedev Inst.)
Affiliation	(Moscow Lebedev Physics Institute, Moscow, Russia) ; (Genoa University/INFN, Dipartimento di Fisica, Genova, Italy) ; (Max-Planck-Institut fur Kernphysik, Postfach, Heidelberg, Germany) ; (Grenoble ISN, Grenoble, France) ; (CERN) ; (Universitat Heidelberg, Physikalisches Institut, Heidelberg, Germany) ; (Universitat Mainz, Institut fur Kernphysik, Mainz, Germany) ; (University of Bristol, Bristol, United Kingdom) ; (University of Iowa, Iowa City, Iowa, USA) ; (Rutgers University, Piscataway, New Jersey, USA)
Publication	2005
Imprint	5 Oct 2005
Number of pages	5
In:	Phys. Rev. C 72 (2005) 055201
DOI	10.1103/PhysRevC.72.055201
Subject category	Particle Physics - Experiment
Accelerator/Facility, Experiment	CERN SPS ; WA89
Abstract	We report on a high-statistics search for the \t1540 resonance in $\Sigma^-$-nucleus collisions at 340 \gevc1 . No evidence for this resonance was found in our data sample which contains 13 millions $K^0_s \to \pi^+\pi^- $ decays above background. For the decay channel $\Theta^+ \to K^0_s p$ and the kinematic range $x_F>$ 0.05 we find the production cross section to be $BR(\Theta^+ \to K^0_s p)\cdot \sigma_0 <$ 1.8 $\mu$b per nucleon at 99% CL.