Rough Idea of K ++AK *+X Experiments

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Presentation transcript:

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

Motivation Medium effect for vector meson is at KEK-PS f r,w m*/m 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.

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

K ++p (n) K* +X cross-section reaction K+ 1.1 GeV/c 1.5 1.8 K+ + p total ~17.5 [mb] ~18 [mb] ~17.8 [mb] K*+ + p ~1.3 [mb] ~4 [mb] ~2.6 [mb] K*0 + D++ ~0.2 [mb] ~0.3 [mb] ~0.4 [mb] K+ + n 18-22 [mb] ~1.8 [mb] ~3.5 [mb] + n ~0.5 [mb] ~1.5 [mb] ~1.1 [mb] 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.

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.

K * Experiments K*+  K++g Via K+p decay channel? 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.

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

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

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