Search for pentaquarks in 920 GeV proton-nucleus collisions

A. Sbrizzi

doi:10.1016/j.nuclphysbps.2005.01.061

Search for pentaquarks in 920 GeV proton-nucleus collisions

A. Sbrizzi

(Astro)-Particles Physics

Research output: Contribution to Journal › Article › Academic › peer-review

Abstract

Evidence for the observation of the narrow
Θ+(1540)
resonance, tentatively identified as a
1/2+
pentaquark state of strangeness +1, has been recently reported by several collaborations by using incident beams of photons, kaons, neutrinos, and electrons. The NA49 Collaboration has furthermore reported the observation of narrow resonances at 1862 GeV/c2 decaying via exotic charge combinations of (
Ξ,π
) which could be identified as doubly-strange members of a pentaquark anti-decuplet. We report on our search for these resonances at HERA-B which is a fixed target experiment installed on the 920 GeV/c2 HERA proton beam at DESY with acceptance near
xF=0
. The data sample consists of 200 million minimum bias events taken during the 2002/2003 HERA run. We discuss details of our analysis of (p,KS0) and (Ξ,π) mass spectra, and present results including a cross section limit for Θ+ production on carbon and tungsten targets, and limits for particle ratios such as
Θ+/Λ(1520) and Ξ−−/Ξ0(1530).

Original language	English
Pages (from-to)	370-373
Number of pages	4
Journal	Nuclear Physics B - Proceedings Supplements
Volume	142
Early online date	19 Feb 2005
DOIs	https://doi.org/10.1016/j.nuclphysbps.2005.01.061
Publication status	Published - May 2005

Bibliographical note

Part of special issue: Hyperons, Charm and Beauty Hadrons: Proceedings of the 6th International Conference Hyperons, Charm and Beauty Hadrons. Edited by C.S. Kalman; N. Solomey; M. Bozzo; I. Narodetskii; J. McKenna; J. Rosner; H. Rubin, P. Singer

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title = "Search for pentaquarks in 920 GeV proton-nucleus collisions",

abstract = "Evidence for the observation of the narrow Θ+(1540) resonance, tentatively identified as a 1/2+ pentaquark state of strangeness +1, has been recently reported by several collaborations by using incident beams of photons, kaons, neutrinos, and electrons. The NA49 Collaboration has furthermore reported the observation of narrow resonances at 1862 GeV/c2 decaying via exotic charge combinations of (Ξ,π) which could be identified as doubly-strange members of a pentaquark anti-decuplet. We report on our search for these resonances at HERA-B which is a fixed target experiment installed on the 920 GeV/c2 HERA proton beam at DESY with acceptance near xF=0. The data sample consists of 200 million minimum bias events taken during the 2002/2003 HERA run. We discuss details of our analysis of (p,KS0) and (Ξ,π) mass spectra, and present results including a cross section limit for Θ+ production on carbon and tungsten targets, and limits for particle ratios such as Θ+/Λ(1520) and Ξ−−/Ξ0(1530).",

author = "A. Sbrizzi",

note = "Part of special issue: Hyperons, Charm and Beauty Hadrons: Proceedings of the 6th International Conference Hyperons, Charm and Beauty Hadrons. Edited by C.S. Kalman; N. Solomey; M. Bozzo; I. Narodetskii; J. McKenna; J. Rosner; H. Rubin, P. Singer",

year = "2005",

month = may,

doi = "10.1016/j.nuclphysbps.2005.01.061",

language = "English",

volume = "142",

pages = "370--373",

journal = "Nuclear Physics B. Proceedings Supplement",

issn = "0920-5632",

publisher = "Elsevier",

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T1 - Search for pentaquarks in 920 GeV proton-nucleus collisions

AU - Sbrizzi, A.

N1 - Part of special issue: Hyperons, Charm and Beauty Hadrons: Proceedings of the 6th International Conference Hyperons, Charm and Beauty Hadrons. Edited by C.S. Kalman; N. Solomey; M. Bozzo; I. Narodetskii; J. McKenna; J. Rosner; H. Rubin, P. Singer

PY - 2005/5

Y1 - 2005/5

N2 - Evidence for the observation of the narrow Θ+(1540) resonance, tentatively identified as a 1/2+ pentaquark state of strangeness +1, has been recently reported by several collaborations by using incident beams of photons, kaons, neutrinos, and electrons. The NA49 Collaboration has furthermore reported the observation of narrow resonances at 1862 GeV/c2 decaying via exotic charge combinations of (Ξ,π) which could be identified as doubly-strange members of a pentaquark anti-decuplet. We report on our search for these resonances at HERA-B which is a fixed target experiment installed on the 920 GeV/c2 HERA proton beam at DESY with acceptance near xF=0. The data sample consists of 200 million minimum bias events taken during the 2002/2003 HERA run. We discuss details of our analysis of (p,KS0) and (Ξ,π) mass spectra, and present results including a cross section limit for Θ+ production on carbon and tungsten targets, and limits for particle ratios such as Θ+/Λ(1520) and Ξ−−/Ξ0(1530).

AB - Evidence for the observation of the narrow Θ+(1540) resonance, tentatively identified as a 1/2+ pentaquark state of strangeness +1, has been recently reported by several collaborations by using incident beams of photons, kaons, neutrinos, and electrons. The NA49 Collaboration has furthermore reported the observation of narrow resonances at 1862 GeV/c2 decaying via exotic charge combinations of (Ξ,π) which could be identified as doubly-strange members of a pentaquark anti-decuplet. We report on our search for these resonances at HERA-B which is a fixed target experiment installed on the 920 GeV/c2 HERA proton beam at DESY with acceptance near xF=0. The data sample consists of 200 million minimum bias events taken during the 2002/2003 HERA run. We discuss details of our analysis of (p,KS0) and (Ξ,π) mass spectra, and present results including a cross section limit for Θ+ production on carbon and tungsten targets, and limits for particle ratios such as Θ+/Λ(1520) and Ξ−−/Ξ0(1530).

U2 - 10.1016/j.nuclphysbps.2005.01.061

DO - 10.1016/j.nuclphysbps.2005.01.061

M3 - Article

VL - 142

SP - 370

EP - 373

JO - Nuclear Physics B. Proceedings Supplement

JF - Nuclear Physics B. Proceedings Supplement

SN - 0920-5632

ER -

Search for pentaquarks in 920 GeV proton-nucleus collisions

Abstract

Bibliographical note

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