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Samples of Hall B Results with Strong Italian Impact

Launch a new program at Jefferson Lab's Hall B to strengthen the role of the lab in hadron spectroscopy. Study meson interactions, exotic mesons, and the nature of mass in hadrons. Utilize the unique capabilities of the CLAS12 detector to explore and validate lattice-QCD predictions. Collaborate with institutions such as Edinburgh U., Glasgow U., and INFN for project coordination.

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Samples of Hall B Results with Strong Italian Impact

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  1. Samples of Hall B Results with Strong Italian Impact Structure of the Nucleon Hadron Spectroscopy INFN visit at JLab Transition between Hadronic and Partonic Degrees of Freedom

  2. Hadron spectroscopy in CLAS and CLAS12 Hunting for new configurations beyond qq and qqq Quantitative understanding of quark and gluon confinement Revealing the nature of the mass of the hadrons See the QCD degrees of freedom at work accessing gluonic degrees of freedom Validate lattice-QCD predictions Photoproduction experiments with high statistics and high precision with CLAS@6GeV showed the discovery potential of Jefferson Lab First observation of the f0(980) in a photoproduction experiment f0(980) Meson Spectroscopy Program with CLAS12 Study the meson spectrum in the 1-3 GeV mass range to study qq interaction and identify gluonic excitation of mesons (hybrids) with 'exotic' quantum numbers Study strangeness-rich mesons exploiting the unique combination of particle Id and resolution of the CLAS12 detector Launch a new program to strengthen the role of JLab in hadron spectroscopy

  3. Electron energy/momentum Photon energy (n=E-E') Polarization e-1 ~ 1 + n2/2EE' Calorimeter + Tracking + Veto Electron angles Q2= 4 E E' sin2J/2 j polarization plane To separate photons from electrons and to define the trigger The Forward Tagging Facility for CLAS12:Quasi-real electroproduction at Low Q2 A tagged photon beam will open new possibility for high quality physics beyond the already approved program • Exotic meson search • Hadron spectroscopy • J/y threshold production • ... • Electron scattering at “0” degrees (2° - 5°)  low Q2 virtual photon  real photon • Photon tagged by detecting the scattered • electron at low angles • Quasi-real photons are linearly polarized  Polarization ~ 65% - 20% • High Equivalent Luminosity  Ng ~ 5 x107 g/s • (unique opportunity to run thin gas target!) Institutions: Edinburgh U., Glasgow U., INFN (project coordination), JLab, NSU, Orsay, Saclay • Complementary to Hall-D (GLUEX) • Exploits the unique PID & resolution of CLAS12

  4. Experimental Equipment for Hall B Polarized Target for electron beam ~700K$ Cerenkov Counter for low-Q2 ~300K$ Important contributions to base equipment and specific apparatus Large Angle Calorimeterfor detection ofneutrals ~4M$ Upgrade of the Bonus Electronics~45K$ HD target fridge ~500K$ Start Counterforphotonbeam ~47K$ TaggerElectronics Upgrade ~70K$

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