UConn Physics Graduate Studies Open House Mar 19

UConn Physics Graduate Studies Open House, Mar. 19, 2010 Hadron Physics with polarized photons at 9 Ge. V with Glue. X Richard Jones University of Connecticut

Future 2

Motivation: the hadron mass spectrum in QCD Consider QCD with only heavy quarks: Data from Lattice QCD show : n the light mesons are glueballs 2. 0 (Ge. V) n qq mesons have the conventional positronium low-energy spectrum V 0(QQ) glueball decay threshold 1. 0 n spectrum is distorted at higher excitations by a linear potential n for r > 0. 5 fm a tube of gluonic flux forms between q and q 0. 0 0. 4 0. 8 1. 2 1. 6 r (fm) 3

Motivation: the hadron mass spectrum in QCD Consider QCD with only heavy quarks: n gluonic excitations give rise to new potential surfaces n for r >> r 0 gluonic excitations behave like flux tube oscillations n inspires the flux tube model 4

Motivation: conventional vs hybrid mesons excited flux-tube m=1 ground-state flux-tube m=0 normal mesons 1 -+ or 1+- Flux-tube Model m=0 CP=(-1)S+1 m=1 CP=(-1)S S=0, L=0 S=1, L=0 J=1 CP=+ J=1 CP=- JPC=1++, 1 -- CP = (-1)L+S (-1)L+1 = (-1)S+1 JPC = 0 -+, 0+1 -+, 1+- (not exotic) exotic 2 -+, 2+5

Recent results with unquenched lattices Dudek et. al. , preliminary results @ pion mass 700 Me. V/c 2 6

12 Ge. V CEBAF Upgrade magnets and power supplies CHL-2 7

Construction of Hall D is underway Ground breaking in April 2009 Live webcam feed of Hall D site Current plans call for the first beam in Hall. D/Glue. X in late 2014. 8

Gluex – discovery at the forefront of nuclear science 9