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Rough Idea of K + +A  K *+X Experiments

Rough Idea of K + +A  K *+X Experiments. Masashi Kaneta Department of Physics Tohoku University. Motivation. Medium effect for vector meson is at KEK-PS via f , r , w channels. f. r,w. m*/m. How about the other vector meson? K * effect might be between f and r , w

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Rough Idea of K + +A  K *+X Experiments

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  1. Rough Idea ofK ++AK *+X Experiments Masashi Kaneta Department of Physics Tohoku University Masashi Kaneta, Tohoku Univ.

  2. Motivation • Medium effect for vector meson is at KEK-PS • via f, r, w channels f r,w m*/m • How about the other vector meson? • K* • effect might be between f and r, w • T.Hatsuda said, result from Walecka model are different from one of QCD sum rule • K* seems to be fine with Kaon beam at J-PARC r/r0 predictions from Hatsuda and Lee Masashi Kaneta, Tohoku Univ.

  3. K*(892) from PDG Masashi Kaneta, Tohoku Univ.

  4. K ++p(n) K* +X cross-section PRC61 (1999) 024901 (Note: original data points from Total Cross-Sections for Reactions of High Energy Particles, edited by A. Baldni, V. Flaminio, W. G. Moorhead, and D. R. O. Morrison ~Springer-Verlag, Berlin, 1988!, Vols. 12a, 12b.) Masashi Kaneta, Tohoku Univ.

  5. K * Experiments • K++A reaction • Measure K*+ K++g • >1 mb • ~ 2.6 (1.1) mb for 1.8GeV/c K++p (n) • ~ 4 (4) mb for 1.5GeV/c K++p (n) • ~ 1.3 (0.5) mb for 1.1GeV/c K++p (n) • Branching ratio is 0.001 for K*+ K++g • Mean free path of K = 5-6 fm/c • Detector • K+: high resolution spectrometer • : EMCal (should be sensitive <1GeV) • like SKS + FOREST at K1.8 • like SSKS (or HKS) + FOREST at K1.1 Masashi Kaneta, Tohoku Univ.

  6. K * Experiments • K*+ K++g • Need to be estimate quantitatively • beam momentum • yield • efficiency: K+ and g momentum and angle distribution • trigger • background • K*+  K++p0 itself makes a background • Via K+p decay channel? • K++p- or K++p0, or K0+p+ • Large solid angle spectrometer with enough resolution • J-PARC E16 + TOF (MRPC?) • K++A: K1.8 • p+A: 30GeV or 50GeV primary proton beam Masashi Kaneta, Tohoku Univ.

  7. bg dependence NPA774 (2006) 723 Masashi Kaneta, Tohoku Univ.

  8. bg JAM Calculation 1.3 GeV/c K+ + p 1.2 GeV/c K+ + p 1.1 GeV/c K+ + p 1.4 GeV/c K+ + p 1.8 GeV/c K+ + p 1.5 GeV/c K+ + p K *+bg Masashi Kaneta, Tohoku Univ.

  9. K *+ mass JAM Calculation 1.3 GeV/c K+ + p 1.2 GeV/c K+ + p 1.1 GeV/c K+ + p 1.8 GeV/c K+ + p 1.5 GeV/c K+ + p 1.4 GeV/c K+ + p Masashi Kaneta, Tohoku Univ.

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