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Introduction to Pentaquark Search

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Search for the Pentaquark Θ+ via the π−p → K−X Reaction at J-PARC

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Abstract

Study of exotic hadrons, which cannot be interpreted as ordinary three-quark baryons or quark-antiquark mesons, would offer us a good opportunity to investigate low-energy quark dyanmics. The pentaquark \(\varTheta ^+\) has a strangeness quantum number \(S=+1\) with its minimal quark configuration of \(uudd\bar{s}\). The distinct features of the \(\varTheta ^+\) are a light mass of about 1540 MeV and a narrow width of a few MeV or less. If such an exotic pentaquark exits, it is quite interesting from a viewpoint of the hadron structure. Many experiments searched for the \(\varTheta ^+\) so far, but the experimental situation was still controversial. For further investigation, a high-statistics and high-resolution experiment has been required. In this chapter, both theoretical and experimental studies of the \(\varTheta ^+\) pentaquark are reviewed. The present experiment is introduced in the last section.

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Notes

  1. 1.

    The reanalysis of SAPHIR is found in [53] leading the same result.

  2. 2.

    The latest DIANA result before 2012 was \(\varGamma _{\varTheta }=0.39\pm 0.10\) MeV [17].

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  1. Department of Physics, Kyoto University, Kyoto, Japan

    Manabu Moritsu

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Moritsu, M. (2016). Introduction to Pentaquark Search. In: Search for the Pentaquark Θ+ via the π−p → K−X Reaction at J-PARC. Springer Theses. Springer, Singapore. https://doi.org/10.1007/978-981-10-0012-6_1

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