Reimei WS at Tokai/J-PARC August/09/2016 Hadron Physics at J-PARC K10 beam line Hiroaki Ohnishi RIKEN/RCNP Osaka Univ.
How the matter created by QCD QCD is the “theory” to describe strong interaction Final goal is to understand strong interacting matter quark/hadron/nuclei to high density nuclear matter However, even the first step how hadron created from quarks is not clear yet. quark hadron nuclei high-density matter
Questions need to be answered What is the effective DoF to describe hadron? •How the property of the hadron are changing when the environmental condition is changed, such as high density? • How hadrons are formed from quarks
Questions need to be answered What is the effective DoF to describe hadron? •How the property of the hadron are changing when the environmental condition is changed, such as high density? • How hadrons are formed from quarks
Hadron in nuclear media will change as a function of T/ρ at high T and ρ （restoration of chiral symm.) for example, Gell-Mann-Oakes-Renner relation SPS, RHIC, LHC KEK-PS J-PARC < ¯ qq > • quark condensates < ¯ qq > = 0 QGP neutron • will be realize star W.Weise NPA553, 59 (1993). < ¯ qq > • relation exist between and Hadron mass, qq > = m 2 π f 2 − 4 m q < ¯ π ss > = m 2 K f 2 − ( m q + m s ) < ¯ qq + ¯ K
Hadron in nuclear media will change as a function of T/ρ the extremely condition at high T and ρ （restoration of chiral symm.) Meson property will change under for example, Gell-Mann-Oakes-Renner relation SPS, RHIC, LHC KEK-PS J-PARC < ¯ qq > • quark condensates < ¯ qq > = 0 QGP neutron • will be realize star W.Weise NPA553, 59 (1993). < ¯ qq > • relation exist between and Hadron mass, qq > = m 2 π f 2 − 4 m q < ¯ π ss > = m 2 K f 2 − ( m q + m s ) < ¯ qq + ¯ K
The property of the hadron in nucleus ρ,ω(light ) : K : π : ＋ … ＋ … φ ( ) : D (light-heavy): investigate QCD vacuum structure, condensation parameters • Meson in nucleus will be a good probe to ρ ̸ = 0 c.f. @ < q ¯ q > ρ • different meson will probe different { qq > = m 2 π f 2 − 4 m q < ¯ π ss > = m 2 K f 2 − ( m q + m s ) < ¯ qq + ¯ K qq > 2 < q ¯ < ¯ ρ + < ¯ u γ µ D µ u > ρ q > ¯ m s < ¯ ss ss > ρ m Q < ¯ qq > ρ
One example: Kaon(K) in nucleus ( Λ(1405) play the leading role in KN interaction) (K nucleus bound state) will be cleated • K and N interaction is strongly attractive • If attraction is strong enough, Kaonic nucleus Y.Akaishi & T.Yamazaki, PLB535, 70(2002).
Why Kaonic nucleus due to strong attraction between K and nucleon • why Kaonic nucleus is interesting/important? • High density nuclear matter could be produced
Why Kaonic nucleus due to strong attraction between K and nucleon adding K • why Kaonic nucleus is interesting/important? • High density nuclear matter could be produced
One example: Kaon(K) in nucleus theoretical investigation and experiments to search for the Kaonic nucleus, ( simplest one will be S=-1 dibaryon or KNN ) are performed. • Since long time,
One example: Kaon(K) in nucleus theoretical investigation and experiments to search for the Kaonic nucleus, ( simplest one will be S=-1 dibaryon or KNN ) are performed. Theory Experiment • Since long time,
One example: Kaon(K) in nucleus theoretical investigation and experiments to search for the Kaonic nucleus, ( simplest one will be S=-1 dibaryon or KNN ) are performed. Theory Experiment Recently , new very important results are reported from J-PARC • Since long time,
K-pp(or S=-1 dibaryon)?
K-pp(or S=-1 dibaryon)? d(π + ,K + ) reaction/E27 M( π + Σ +N) � M(K+p+p) � Y. Ichikawa et al., PTEP (2015) 021D01 Σ 0 p �
K-pp(or S=-1 dibaryon)? d(π + ,K + ) reaction/E27 3 He(K-,Λp)n reaction/E15 M( π + Σ +N) � M(K+p+p) � Y. Sada et al., PTEP (2016) 051D01. Y. Ichikawa et al., PTEP (2015) 021D01 Σ 0 p �
K-pp(or S=-1 dibaryon)? d(π + ,K + ) reaction/E27 3 He(K-,Λp)n reaction/E15 M( π + Σ +N) � M(K+p+p) � Y. Sada et al., PTEP (2016) 051D01. Y. Ichikawa et al., PTEP (2015) 021D01 Σ 0 p �
Theoretical interpretation and new data predicted • Sekihara, Oset, Ramos, arXiv:1607.02058 • Two peak structures near the KNN threshold are K bar NN quasi-elas@c bound-state kaon scaCering
Theoretical interpretation and new data predicted New high statistics data from E15 data indicates two peaks! • Sekihara, Oset, Ramos, arXiv:1607.02058 • Two peak structures near the KNN threshold are K bar NN quasi-elas@c bound-state kaon scaCering E15 2nd � M[ π + Σ +N] � M[K+p+p] �
Meson in nucleus ( for example search for the bound state other than KNN ) produce “double K in nucleus”. it may be possible, via (K-,K+) reaction or p stop on 3 He ( p stop + 3 He → K+K+ K-K-pn ) But, it will be difficult due to huge background exotic state, even though huge background is expected. • K nucleus will be studied insensibly at J-PARC • It will be very interesting, if we will be able to • HI collision will be good place to search such
Meson in nucleus ( for example search for the bound state other than KNN ) produce “double K in nucleus”. it may be possible, via (K-,K+) reaction or p stop on 3 He ( p stop + 3 He → K+K+ K-K-pn ) But, it will be difficult due to huge background exotic state, even though huge background is expected. What will be next? • K nucleus will be studied insensibly at J-PARC • It will be very interesting, if we will be able to • HI collision will be good place to search such
Lesson from resent progress on hadron physics
Recent discoveries discovered at collider experiments such as Belle/LHCb, etc. • Many tetra/penta-quark candidates are
Recent discoveries discovered at collider experiments such as Belle/LHCb, etc. • Many tetra/penta-quark candidates are
X(3872) • discovered inB ± →K ± π + π - J/ψ decay • Known decay mode: X(3872) →π + π - J/ψ • J PC = 1 ++ (recently determained) • Now X(3872) is understood as mixture of – ¯ cc – D - D ∗ 0 D 0 D 0 ͞ c ͞ c D ∗ + D − + – + d ͞ c d c ͞ d ͞ d c c charmonium D *+ D* 0
Recent discoveries discovered at collider experiments such as Belle/LHCb, etc. • Many tetra/penta-quark candidates are
Recent discoveries discovered at collider experiments such as Belle/LHCb, etc. • Many tetra/penta-quark candidates are
Structure of the Z resonance is not clear yet the state must contained , but with charge! Z + (4430) • discovered in B decay. • known Decay mode : Z+ → ψ’ π+ ¯ cc cc ¯ du – minimum quark content might be ¯ • Genuine tetra quark? • + (di-quark and anti di-quark) q ¯ ¯ qq q D ¯ • molecule ? D c • mixture of above states D 0 D - d d ͞ u or/and ͞ c c ͞ c ͞ u
Recent discoveries discovered at collider experiments such as Belle/LHCb, etc. • Many tetra/penta-quark candidates are
Recent discoveries discovered at collider experiments such as Belle/LHCb, etc. Penta quark with charm quark • Many tetra/penta-quark candidates are
charm quark will play important roles to understand hadron
charm quark will play important roles to understand hadron D meson in nuclear media?
D meson in nucleus of charm quark ( ) only may suffering the effect of “Pauli Blocking” → interaction for could be very different • Uniqueness for D meson • Modification is magnified largely due to mass m Q < ¯ qq > ρ ¯ D (¯ cq ) , D ( c ¯ q ) • different interaction pattern for : ¯ D (¯ cq ) , D ¯ D (¯ cq ) , D ( c ¯ q )
D meson in nucleus vacuums of charm quark ( ) is expected only may suffering the effect of “Pauli Blocking” → interaction for could be very different mass separation between in medium • Uniqueness for D meson • Modification is magnified largely due to mass m Q < ¯ qq > ρ ¯ D (¯ cq ) , D ( c ¯ q ) • different interaction pattern for : ¯ D (¯ cq ) , D ¯ D (¯ cq ) , D ( c ¯ q ) D ± D − ¯ D, D in nuclear media D +
Prediction of D + D - mass splitting coupled approach chiral model quark-meson coupling QCD sum rule isospin average channel P h y s . L e B t 6 t D + . 3 3 , 4 3 P h y s . R e 0 v 1 . 5 C 2 8 0 4 8 , P h y D − s . R e 0 v 2 . 4 C 9 7 0 9 8 , P h y s . R e 0 v 6 . 5 C 2 8 0 1 4 , E u r . P h y A s 6 . J , . 3 5 P h y s . L e B t 4 t . 8 7 , 9 6 E u r . P h y C s 7 . J 4 . , 3 0 2 1 P h y s . R e C v 9 . 2 0 6 5 2 0 5
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