クラスターで読み解く クォーク・ハドロン階層構造 Elucidation of hierarchical structure between quark and hadron phases by means of quark clusters Hiroaki Ohnishi ELPH, Tohoku University 新学術領域「量勵⼦孑クラスターで読み解く物質の階層構造」 キックオフシンポジウム 2018/11/19-20
Contents 1. Physics goal for this project 2. Project overview 3. Research organization 4. Time line for this project 5. Summary 2 9 pages 7 pages 1 page 1 page
Contents 1. Physics goal for this project 2. Project overview 3. Research organization 4. Time line for this project 5. Summary 3
History of our Universe we are here A02 quark gluon plasma Formation of are generated and leptons quarks・gluons 3~20 min. 10 -6 ~1 s ~10 -6 s t=0s now Li He Deuteron synthesis Nuclear generated Hadrons are Confinement! Big Bang 4 13.8 By
Topics of hadron physics How the matter created via QCD 5 System with Valence quarks Quark confined inside hadron “bare” quark degree of freedom will be masked when hadrons are formed New hierarchy appears i.e. “World of Hadrons” → DoF for this hierarchy is “hadron”
Hadron molecule or Exotic color singlet state QCD meson/baryon config. DoFs quark / di-quark 6 hadron system Hadron-Hadron Hadron Semi-hierarchy what is relevant DoF in the semi-hierarchy quark / di-quark • If Semi-hierarchy exist, then question will be,
Excitation of hadron and internal structure spectrum in excited hadron will be elucidate DoFs in semi-hierarchy Original picture draw by Dr. T.Hyodo 7 Hadron molecule Multi-quark Normal hadrons Meson-Baryon system Excited state Internal Energy excitation qq pair Ground creation state
Di-quark correlation → di-quark correlation color magnetic interaction could be equal each other three di-quark correlation → i.e. cannot distinguish! 8 is expected two quark correlation out of three constituents • Inside hadron, for example baryons, strong • Source of the di-quark correlation, α s ( λ i · λ j )( ⃗ σ j ) σ i · ⃗ V CMI ∼ m i m j Light baryon: m i =almost equal
The way to clarify effective DOFs inside hadron weak Strong! enhanced (if strong qq correlation exist) i.e. di-quark(qq) correlation inside hadron will be qq cluster appears in baryon 9 interaction(CMI) will be suppressed due to Color magnetic • Embedded heavy quark(HQ) in hadron! • interaction between HQ and light quark(q) α s ( λ i · λ j )( ⃗ σ j ) σ i · ⃗ V CMI ∼ m i m j V CMI ∼ 0 , where m → ∞
ρ p-wave in energy spectrum of excited hadron inside hadron will be separated two-modes in di-quark correlation (one strange/ one charm ) With hyperon and charmed baryons Baryon spectroscopy separated for baryon with one HQ but will be G.S. ρ Di-quark correlation λ λ ρ λ 10 hadron(qqq) existed states, How it will be appeared in hadron spectrum when one of the quark is getting heavy • Two excitation modes are expected in baryon • Those states will be degenerated in light
Baryon with strange quark 11 s q-q • Λ / Σ : q-q + Q system Similar to charmed baryon Q Wide decay width Q-Q • Ξ : q + QQ system 2 Heavy Quark system q Narrow decay width Q Q • Ω : QQQ system 3 Heavy Quark system Narrow decay width Q
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