Light and heavy quark spectroscopy at EIC M.Battaglieri INFN -GE - PowerPoint PPT Presentation

Light and heavy quark spectroscopy at EIC M.Battaglieri INFN -GE Italy 1 M.Battaglieri - INFN GE Light and heavy quark spectroscopy at EIC

The EIC physics (so far …) 2 M.Battaglieri - INFN GE Light and heavy quark spectroscopy at EIC

EIC and the other facilities • Luminosity 100-1000 times that of HERA – Enable 3D tomography of gluons and sea quarks in protons • Polarized protons and light nuclear beams – Critical to all spin physics related studies, including precise knowledge of gluon’s spin & angular momentum contributions from partons to the nucleon’s spin • Nuclear beams of all A (p → U) – To study gluon density at saturation scale and to search for coherent effects like the color glass condensate and test universality • Centre of mass variability with minimal loss of luminosity – Critical to study onset of interesting QCD phenomena • Detector & IR designs mindful of “Lessons learned from HERA” – No bends in e-beam, maximal forward acceptance…. 3 M.Battaglieri - INFN GE Light and heavy quark spectroscopy at EIC

EIC detectors eRHIC JLEIC hadrons electron 4 M.Battaglieri - INFN GE Light and heavy quark spectroscopy at EIC

Hadron spectroscopy at EIC • Beams (intensity, polarization) EIC is the perfect place to study hadron • Detectors spectroscopy addressing the remain ing • Kinematic coverage open questions in hadron physics We want to do better optimising the EIC design for the next HS generation I) Light and heavy quarks (+ gluons) spectroscopy Build the studying exotic configurations physics case II) Heavy flavours (open and hidden) to prove nuclear medium III) Diffractive physics Opportunities Opportunities Requirements 5 M.Battaglieri - INFN GE Light and heavy quark spectroscopy at EIC

Hadron spectroscopy at EIC 6 M.Battaglieri - INFN GE Light and heavy quark spectroscopy at EIC

Hadron spectroscopy at EIC ★ Meson and baryon spectroscopy as a tool to study QCD phases ★ Color confinement ★ manifestation of gluonic degrees of freedom ★ non-perturbative dressing effects ★ gluon-gluon interaction ★ confinement ★ light-q vs heavy-q Significant word-wide effort: COMPASS, JLab BES-III,LHCb, ALICE, BELLE 7 M.Battaglieri - INFN GE Light and heavy quark spectroscopy at EIC

Hadron spectroscopy at EIC Hadroquarkonium Tetraquark Molecule Meson Baryon Glueball Hybrids 𝝆 𝝆 𝑲 / 𝝎 𝝆 Science (2008) «The Electron Ion Collider will act as an enormous microscope» to study quarks inside hadrons Observed mesons and baryons well We want to use it to study «enormous» hadrons! described by 1 st principles QCD 8 M.Battaglieri - INFN GE Light and heavy quark spectroscopy at EIC

The charmonium orthodoxy 𝑅 ¯ 𝑅 Potential models (when ) 𝑊 ( 𝑠 ) = − 𝐷 𝐺 𝛽 𝑡 + 𝜏𝑠 𝑠 Effective theories (HQET, NRQCD, pNRQCD...) Integrate out heavy DOF ↓ (spectrum), decay 
 & production rates 9 M.Battaglieri - INFN GE Light and heavy quark spectroscopy at EIC

XYZ exotics A host of new and unexpected resonances have appeared Preferred decay: charmonium + light Difficult to reconcile with charmonium-like interpretation The good old times suddenly ended disclosing a realm populated by new and unknown states (multi-quarks? glue-rich? …) 10 M.Battaglieri - INFN GE Light and heavy quark spectroscopy at EIC

XYZ exotics • Many new states in the charmonium sector • Convincing evidence of new exotic hadronic states 𝑎 𝑑 (3900) • Probably, more to come • Bottomonium almost unexplored 𝑌 (3872) A rich phenomenology that requires to be understood and thoroughly studied in a high statistics, high precision experiment covering a wide kinematic range Electron Ion Collider 11 M.Battaglieri - INFN GE Light and heavy quark spectroscopy at EIC

Exotic charmonia at COMPASS μ N → μ ’ (J/ Ψ π + π -) π ± N* A.Guskov (JINR) 12 M.Battaglieri - INFN GE Light and heavy quark spectroscopy at EIC

✴ Tetraquarks Exotica at LHCb ✴ (light) hybrids ✴ Glueballs ✴ Odderon Double J/ Ψ production • Double pomeron exchange • Sensitivity to high mass states (tetraq) EIC may produce such states trough gamma-gamma collisions R.McNulty (UCD) 13 M.Battaglieri - INFN GE Light and heavy quark spectroscopy at EIC

The light quark meson spectrum Constituent Quark Model Consider light • Quark-antiquark pairs with total spin S=0,1 quarks: 
 and orbital angular momentum L u,d,s S 1 S=S 1 +S 2 J= L+S L P = (-1) L+1 C= (-1) L+S S 2 Not all the J PC combinations are allowed: 0 ++ 0 +- 0 -+ 0 -- 1 ++ 1 +- 1 -+ 1 -- 2 ++ 2 +- 2 -+ 2 -- 3 ++ 3 +- 3 -+ 3 -- … • SU(3) flavor symmetry → nonet (8 ⨁ 1) of degenerate states J PC = 0 -+ ⇒ ( π ,K, η , η ’) 1 -- ⇒ ( ρ ,K*, ω , Φ ) 1 +- ⇒ (b 1 ,K 1 ,h 1 ,h 1 ’) ... - • Great success in describing the lower mass states (qq angular momentum) L = 0 1 2 3 4 5 • A number of predicted states is not experimentally observed and assignments are uncertain 14 M.Battaglieri - INFN GE Light and heavy quark spectroscopy at EIC

Hybrids at COMPASS 3 π final state ✴ Possible evidence of exotic meson π 1 (1600) in π − p → p π − π − π + (E852-Brookhaven) ✴ Simple final state with low bg Bad description of data without resonance component 𝜌 1(1600) needed to describe data B.Ketzer (UBonn) 15 M.Battaglieri - INFN GE Light and heavy quark spectroscopy at EIC

Hybrids at COMPASS ηπ final state ✴ π - p → p ηπ - and π - p → p η ’ π - at 191 GeV ✴ π 1 (1400) exotic state (1 -+ wave) B.Ketzer (UBonn) η π D-wave P-wave η ’ π D-wave P-wave 16 M.Battaglieri - INFN GE Light and heavy quark spectroscopy at EIC

Hybrids at COMPASS ηπ final state ✴ π - p → p ηπ - and π - p → p ηπ - at 191 GeV ✴ π 1 (1400) exotic state (1 -+ wave) B.Ketzer (UBonn) η π JPAC interpretation: D-wave P-wave a single resonance that depending on the final states projects at different masses η ’ π D-wave P-wave 17 M.Battaglieri - INFN GE Light and heavy quark spectroscopy at EIC

Hybrid baryons at CLAS12 A.D’Angelo (URome-TV) 18 M.Battaglieri - INFN GE Light and heavy quark spectroscopy at EIC

Hybrid baryons at CLAS12 Electro-production can be used to explore the hadron structure at different wavelengths (Q2) A suppressed A drop of the longitudinal amplitude transverse helicity S 1/2 (Q 2 ) in comparison amplitudes A 1/2 (Q 2 ) with transverse faster than for ordinary electro-excitation three quark states, amplitude Q 3 G because of extra glue- Q 3 G component in valence structure • N π and N ππ give consistent results • A 1/2 changes sign and has large magnitude at high Q 2 • QM fails to reproduce low Q 2 behavior, LFQM better at large Q 2 • Both A 1/2 (Q 2 ) and S 1/2 (Q 2 ) inconsistent with hybrid model prediction A.D’Angelo (URome-TV) 19 M.Battaglieri - INFN GE Light and heavy quark spectroscopy at EIC

Pentaquark 5-quark Hadronic bound state molecule • J/ ψ photoproduction at threshold ~ 70% 2016-2017statistics • Observation of charm at GLUEX • Projections with CLAS12 shows a significant sensitivity or cusp, triangle singularity, etc… Λ b → J/ ψ pK − S.Dobbs (FSU) 20 M.Battaglieri - INFN GE Light and heavy quark spectroscopy at EIC

EIC kinematics and yield estimates • EIC meson production kinematics studied in a simple diffractive ansatz (t-slope) • Virtual photon flux + dipole form factor • 10 GeV electron + 100 GeV proton • Final state compatible with current detectors design: M → e+e- e’/p’ kinematics • Scattered electron: E e’ ~10 GeV within ΔΘ ~2 o forward cone around the beam line • Scattered proton: high p (~90-100 GeV) ΔΘ <<1 o cone in the opposite direction D.Glazier (UGlasgow) 21 M.Battaglieri - INFN GE Light and heavy quark spectroscopy at EIC

EIC kinematics and yield estimates • EIC meson production kinematics studied in a simple diffractive ansatz (t-slope) • Virtual photon flux + dipole form factor • 10 GeV e lectron + 100 GeV proton • Final state compatible with current detectors design: M → e+e- M → e+e- kinematics D.Glazier (UGlasgow) 22 M.Battaglieri - INFN GE Light and heavy quark spectroscopy at EIC

EIC kinematics and yield estimates • EIC meson production kinematics studied in a simple diffractive ansatz (t-slope) • Virtual photon flux + dipole form factor • 10 GeV electron + 100 GeV proton • Final state compatible with current detectors design: M → e+e- • Use production cross section and slope ( σ J/ Ψ ~20nb and b~4) as measured in ZEUS J/ Ψ rate = 0.8Hz (~70k events/day) D.Glazier (UGlasgow) 23 M.Battaglieri - INFN GE Light and heavy quark spectroscopy at EIC

EIC kinematics and yield estimates e N → e’ (J/ Ψ π + π - ) π ± N* X(3872) Yield ~ 100(s) events/day D.Glazier (UGlasgow) 24 M.Battaglieri - INFN GE Light and heavy quark spectroscopy at EIC

Impact on EIC detectors Requirements • Scattered electron and proton detection at 0 degrees! • Far-forward detectors • Tag scattered particle • Determine momentum Results • Exclusive measurements for excellent bg rejection • With good resolution (<0.1%) MissingMass technique would help Far-forward electrons Final states detection Far-forward ion or Roman Pots? 25 M.Battaglieri - INFN GE Light and heavy quark spectroscopy at EIC