Hadron Spectroscopy at J-PARC

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Hadron Spectroscopy at J-PARC

• Takashi Nakano(RCNP, Osaka Univ)
• KEK Workshop on Nuclear Physics at J-PARC
• August 8th,
  2008_at_KEK

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Motivation

• What is a constituent quark?
• Where does it work, where does not, and why?
• Breakthrough New forms of hadrons which cannot
  be explained by a quark model (easily).
• tetraquark, pentaquark, meson-baryon
  meson-meson resonances, etc.

By the way, I believe in the existence of the Q
strongly.
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Method

• A quark cannot be extracted from a hadron freely.
• We study the structure of the hadrons through
  production and decay.
• Once an exotic hadron is established, its absence
  in some production and/or decay processes give
  important information on its structure.
• Once an exotic hadron is established, other
  members of its family must exist.

• Other members of a spin-flavor multiplet
• Excited states
• Meson-baryon duality (qqq)

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Problem

• Very often, we do not know what and where to look
  at, a priori.

• Need to perform an experiment in such a way that
  a pure theorist dreams of.

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Tools

• Variety of beam particles in wide energy range.
• K, K, p, p, p, etc.
• Large solid angle detector with
• High resolution
• Good particle ID (including neutrals)
• High DAQ speed

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Comments

• Lets build THE DETECTOR with FLEXIBLE BEAMLINE
  at J-PARC.
• Strong synergy among J-PARC, KEKB and
  LEPS/SPring-8 can be expected in both Physics
  and Detector RD.
• Interplay of experiment, phenomenology, and
  lattice (and even string theory).
• Interplay between Nuclear and High energy
  physics.
• THE DETECTOR can be used for other physics.

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A happy scenario

• LEPS announce the new evidence for the Q.
• LEPS confirms the evidence with high statics
  data.
• Bell finds more narrow peaks and confirms the
  existence of tetraquarks.
• Budget requests for Hadron hall extension and
  SuperKEKB are approved.
• The Q is confirmed at J-PARC.
• THE DETECTOR and THE BEAMLINE for Hadron Physics
  at J-PARC is built.
• Hadron physics becomes the major activity at
  J-PARC and SuperKEKB.