search for double-kaonic nuclear cluster (K - K - pp) using p+p reaction F.Sakuma, RIKEN discussion is based on •Proc. Jpn. Acad., Ser. B, 87 (2011) 362-370., and •Phys. Rev. C 84 (2011) 015207 [M. Hassanvand, Y. Akaishi and T. Yamazaki] 10GeV 陽陽陽陽陽陽陽陽陽陽陽陽 陽陽陽陽陽陽陽 K --- 陽陽陽陽陽陽陽陽陽陽 --- 1
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Search for double-kaonic nuclear cluster (K - K - pp) using p+p reaction F.Sakuma, RIKEN discussion is based on Proc. Jpn. Acad., Ser. B, 87 (2011) 362-370.,
expected K - K - pp cross-section The free production CS in p+p collision is known to be ~ x total ~ 50 b The free * production CS at 2.83GeV is known to be * ~4.5 b ~ 0.1 x The double- production CS is expected to be ~ x ~ 50nb (= x x total ) Thus, the double- * production CS is expected to be ~ 0.01 x ~ 0.5nb The DISTO result indicates the K - pp production CS is as much as * production CS, so we simply assume K - K - pp production CS to be K-K-pp ~ ~ 0.5nb Of course, these are very rough estimations and depend on incident energy 3
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search for double-kaonic nuclear cluster (K-K-pp)using p+p reaction
F.Sakuma, RIKEN
discussion is based on •Proc. Jpn. Acad., Ser. B, 87 (2011) 362-370., and•Phys. Rev. C 84 (2011) 015207[M. Hassanvand, Y. Akaishi and T. Yamazaki]
10GeV 陽子陽子衝突における二重K中間子核の生成 --- 実験フィージビリティ ---
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experimental principle
8GeV
decay
the produced K-K-pp can be identified by bothmissing-mass spectrum M(K+K+)invariant-mass spectrum M()
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production
expected K-K-pp cross-section• The free production CS in p+p collision is known to be
~ 10-3 x total ~ 50b• The free * production CS at 2.83GeV is known to be
* ~4.5b ~ 0.1 x
• The double- production CS is expected to be ~ 0.001 x ~ 50nb (= 10-3 x 10-3 x total)
• Thus, the double-* production CS is expected to be ~ 0.01 x ~ 0.5nb
• The DISTO result indicates the K-pp production CS is as much as * production CS, so we simply assume K-K-pp production CS to beK-K-pp ~ ~ 0.5nb
Of course, these are very rough estimations Of course, these are very rough estimations and depend on incident energyand depend on incident energy 3
8-10GeV proton yield @ high-p
Prof. Noumi
If yield of proton is assume to be as same as that of pion,
~108 proton/spill(6s) is expected with pp~8-10GeV 4
kaon identification in trigger levelHigh resolutionHigh detection rate
anyway …
are elemental requirements.
from the Construction Proposal
summary• Feasibility of search for double kaonic-nuclear-cluster, K-K-pp,
using 8-10 GeV proton beam is discussed.• Experimental principle is:– 8GeV p+p K++K++X K++K+++– missing mass of K+K+ and/or invariant mass of
• Requirements for detectors are:– wide-coverage forward-detector (0-60 degrees)– good kaon separation in trigger level (pK<~4GeV/c)– high-resolution and high-rate detector
• With the upgraded E16 spectrometer, if double-K+ trigger is realized in momentum region < 4 GeV/c then inclusive K+K+ measurement could be possible.
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we will open new door to the high density matter physics, like the inside of neutron stars