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“Exotic” Hadrons Conventional “Exotic” Strong Binding Summary of the Workshop on Exotic Hadrons Tomasz Skwarnicki Syracuse University 6th International Conference on New Frontiers in Physics, Κολυμβάρι, Ελλάδα, 26 August 2017 Summary of the Workshop on Exotic Hadrons, Kolymbari 2017, Tomasz Skwarnicki 2 Workshop program Monday Aug 21: Light hadron exotics Wednesday Aug 23: Phenomenology of exotic hadrons Tuesday Aug 22: Heavy-quarkonium-like exotics (experimental) Summary of the Workshop on Exotic Hadrons, Kolymbari 2017, Tomasz Skwarnicki 3 Conveners: Alex Bondar, Budker Institute of Nuclear Physics, Novosibirsk, Russia Roman Mizuk, Lebedev Physical Institute, Moscow, Russia Tomasz Skwarnicki, Syracuse University, Syracuse, NY, USA This talk • Use elements of various talks given at the workshop to illustrate status of exotic hadron spectroscopy • Neither a complete review of the field nor of all the talks given at the workshop • I apologize to the workshop speakers not mentioned in the summary • All talks were interesting and we often had animated discussions Indicates the speaker’s name for See this talk for more details material copied from a workshop talk Summary of the Workshop on Exotic Hadrons, Kolymbari 2017, Tomasz Skwarnicki 4 “Exotic” multiquark states conceived already at the birth of Quark Model … … Murray Gell- Mann George Zweig Summary of the Workshop on Exotic Hadrons, Kolymbari 2017, Tomasz Skwarnicki 5 QCD 1 = q ( i D - m q ) q - F F QCD q=u,d,s, 4 c,b,t 1973 Asymptotic Hugh David freedom Politzer Frank Wilczek David Gross Hadron sizes Asymptotic freedom Hadrons = Non-perturbative QCD Confinement SU(3) color V~ r Gluons with Lattice QCD works well for lowest- color-anticolor charge excitations of 푞푞 , 푞푞푞 . Expect hadrons with gluons as Only approximate lattice simulations for V(r) constituents: unstable higher excitations. V~1/r • Hybrids: 푞푞품 , 푞푞푞품 , … LQCD O.Solovjeva’s talk Static qq potential • Glueballs: 품품 , … We have to rely on data and QCD-motivated in Lattice QCD 0.5 1.0 [fm] phenomenology when trying to understand 푟 more complex hadronic structures. 1/10 1 1/0.4 1/0.2 [1/GeV] Summary of the Workshop on Exotic Hadrons, Kolymbari 2017, Tomasz Skwarnicki 6 Mesons from quarks & antiquarks in QCD color octet i 2 color color color i triplet antitriplet singlet 2 1 1 i 2 3 _ 6 2 2 3 8 3 1 1 1 1 i 6 6 2 2 quark antiquark attractive color force i q q 2 (qq) meson i e.g. K+ 2 _ Color flux tube s stretched between repulsive color force quark and antiquark quarks will pull apart _in any with attractive u octet configuration potential gluons happen to belong to the color octet Summary of the Workshop on Exotic Hadrons, Kolymbari 2017, Tomasz Skwarnicki 7 (Colored) diquarks in QCD color (antisymmetric) sextet color antitriplet (symmetric) color color triplet triplet 1 1 _ 2 3 2 6 3 3 quark quark q q 1 repulsive color force quarks will pull apart in any attractive_ color force sextet configuration (half as strong as in the meson) Color flux tube (qq) diquark stretched between Diquark can go in a place of antiquark in a hadron; the quarks and Not a particle, just a antidiquark in place of quark. extending to other s u building block in color partners QCD See Maiani’s talk Summary of the Workshop on Exotic Hadrons, Kolymbari 2017, Tomasz Skwarnicki 8 Diaquarks can make tetraquarks! color color color singlet triplet antitriplet _ 1 1 However, it is not clear if 3 2 1 2 ... an efficient mechanisms to suppress the fall-apart mode to two mesons 3 exists, especially when attractive color force all quarks are light. Color flux tube stretched between ((qq)(qq)) tetraquark the diquark and _ _ diantiquark _ _ s u u attractive color force attractive color force d (qq) diquark (qq) diantiquark d s _ s s q q Summary of the Workshop on Exotic Hadrons, Kolymbari 2017, Tomasz Skwarnicki 9 Conventional and “exotic” hadrons Conventional “Exotic” Strong binding. Weak binding. Large systems. Strong binding. Compact systems. Compact systems. n K _ _ d d s u u d s u _ u s u d d _ p u d p s u u (sq) u K meson u (sqg) (u(ud)) (u(dd)) (u(ud)) (su)) ((q(sq))(qq)) KN molecule pentaquark Hybrid meson d deutron s K u _ _ _ K+ s u u s ((sd)u) _ _ _ L baryon u s s u (gg) Meson and baryons (sq) (sq) ((sq)(sq)) Glueball motivated Quark Model KK molecule tetraquark and Are molecular forces in such QCD predicts attractive forces in Firmly QCD Baryonic systems strong enough to some of such configurations. expected molecules exists! create bound states, or Do they live long enough to produce in QCD pronounced effects? observable states/effects ? Summary of the Workshop on Exotic Hadrons, Kolymbari 2017, Tomasz Skwarnicki 10 Tetraquarks vs meson-meson molecules • The same quark content can, in principle, create a meson-meson molecule or a tetraquark • However, mass spectrum from these two types of bindings are very different ((qq)(qq)) (qq)-(qq) tetraquark meson-meson molecule _ _ _ u u u d _ d s u s See Karliner’s talk on Wed. We don’t know if either one exist (“exotic hadron”) V(r) Typically expect only one state n=1, L=0. … Very rich mass spectrum expected! Fall apart prevented by spatial separation – long-lived states if However, states can below threshold. be undetectable if extremely broad. Mass and JP fairly constrained r from the constituents. Summary of the Workshop on Exotic Hadrons, Kolymbari 2017, Tomasz Skwarnicki 11 Summary of the Workshop on Exotic Hadrons, Kolymbari 2017, Tomasz Skwarnicki 12 N(1685) N(1685) confirmed, N(1728)? i.e. pentaquark Studies in progress: blinded Proton target Summary of the Workshop on Exotic Hadrons, Kolymbari 2017, Tomasz Skwarnicki 13 Defamed Q(1540)+ (uudd푠ҧ) pentaquark candidate A2 experiment blinded blinded blinded blinded Summary of the Workshop on Exotic Hadrons, Kolymbari 2017, Tomasz Skwarnicki 14 d*(2380) dibaryon candidate d u d u ? d u Summary of the Workshop on Exotic Hadrons, Kolymbari 2017, Tomasz Skwarnicki 15 Double-pole structure of L(1405) A2 expects to improve over earlier photo-production experiments n s d d d _ s d 0 u u K See also Noumi’s talk (J-PARC) Summary of the Workshop on Exotic Hadrons, Kolymbari 2017, Tomasz Skwarnicki 16 Summary of the Workshop on Exotic Hadrons, Kolymbari 2017, Tomasz Skwarnicki 17 Summary of the Workshop on Exotic Hadrons, Kolymbari 2017, Tomasz Skwarnicki 18 Glueball studies in BES III LQCD LQCD See also Y.M.Cho’s talk Summary of the Workshop on Exotic Hadrons, Kolymbari 2017, Tomasz Skwarnicki 19 Beginning of XYZ saga Preference for gy’ over gJ/y points to 3 2 P1 component c ’ ? Large isospin c1 violation in these Phys.Rev.Lett. 91 (2003) 262001 decays, The most cited Belle paper (1369 citations) due to m(D0)-m(D-)? … Molecule? very narrow y(2S) Belle GX(3872) <1.2 MeV Huge fall-apart DD* mode from the Molecule? resonance tail DD above the 퐷0퐷∗0 threshold X(3872) Molecule? JPC=1++ Molecule? Summary of the Workshop on Exotic Hadrons, Kolymbari 2017, Tomasz Skwarnicki 20 Prompt production of X(3872) Wednesday talks/discussion: Can’t be a molecule! It is a tightly bound-tetraquark. Agree, can’t be a pure molecule! It is a mixture of a molecule and 3 2 P1 charmomium. and many others including: Talk by Constituent QM supplemented with couplings to meson-meson states Pablo Ortega See also Xiao’s talk MeV % % % % % Summary of the Workshop on Exotic Hadrons, Kolymbari 2017, Tomasz Skwarnicki 21 Can a large molecule mix with a compact charmonium? 014019 Wednesday discussion session: It is not plausible for such For such a long-lived state a large molecular state to as X(3872), even small mix with such a compact overlap of wave functions charmonium state can lead to mixing Alex Bondar Summary of the Workshop on Exotic Hadrons, Kolymbari 2017, Tomasz Skwarnicki 22 Hadronic decay of a 풒풒ഥ resonance Thinking about a state oscillating back-and-fourth between (푐푐ҧ) and 푐푢ത − (푐ҧ푢) is not necessarily the right picture. A different possibility: 푝푝 → ⋯ + 휒′푐1 0 ∗0 then 휒′푐1 → 퐷 퐷ഥ Adopted from Michael Pennington’s slides at Modern Exotic Hadrons INT 15-60W workshop November 2015 Summary of the Workshop on Exotic Hadrons, Kolymbari 2017, Tomasz Skwarnicki 23 Resonance decay Summary of the Workshop on Exotic Hadrons, Kolymbari 2017, Tomasz Skwarnicki 24 Resonance decay Summary of the Workshop on Exotic Hadrons, Kolymbari 2017, Tomasz Skwarnicki 25 Resonance decay Summary of the Workshop on Exotic Hadrons, Kolymbari 2017, Tomasz Skwarnicki 26 Resonance decay Summary of the Workshop on Exotic Hadrons, Kolymbari 2017, Tomasz Skwarnicki 27 Resonance decay Summary of the Workshop on Exotic Hadrons, Kolymbari 2017, Tomasz Skwarnicki 28 Resonance decay Summary of the Workshop on Exotic Hadrons, Kolymbari 2017, Tomasz Skwarnicki 29 Resonance decay Decaying 푞푞ത meson resonance can go through tetraquark and/or molecular configurations. This can sometimes lead to Dynamically generated state; an extra pole in the scattering matrix Summary of the Workshop on Exotic Hadrons, Kolymbari 2017, Tomasz Skwarnicki 30 K- Discovery of Z(4430)+ T. Skwarnicki (Tue.) + + Zc → y’휋 First charged charmonium-like + * Zc K Belle 2008 state discovered! By’p+K PRL 100, 142001 (2008) charged neutral y’ K*0→ K− 휋 + 1D M(y’p) mass fit not “K* veto region”: suppress K*(892) and K*2(1430) d K*(892) K*2(1430) Exotic Standard Z(4430)+ tetraquark, charmonium molecule, K*Kp+ … bkg.
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