1. QM08 J. Schukraft 1 What else can one do with pp@LHC ? pp at LHC: plenty of everything..  Lots of energy: 14 TeV  Lots of time: several months/year Lots  Lots of rate : L: 10 30 - 10 34 cm -2 s -1 => MinBias rate > 50 kHz– 500 MHz Physics: The usual suspects..  SM, BSM:Higgs, Susy, black holes, …..  nonpert QCD: low x physics, Color Glass, baryon transport, ….  heavy ion:comparison data (necessary, but boring ?) A new suspect at LHC: light ion physics with protons ?

2. QM08 J. Schukraft 2 Global pp event properties Multiplicity distribution at LHC  quite respectable particle densities  dN ch /d  ~ 50 – 100 can be reached !  > central S+S @ SPS, mid-central Cu-Cu @ RHIC  naïvely, energy density  > 5 – 10 GeV/fm 3   0 = 1 fm, V = 5 fm 3 even protons get obese these days  p@LHC ~ small (but very dense) nucleus@SPS ‘QGP’ physics with protons  at least: onset of hadronic FS interactions  maybe: collective hadronic/partonic dynamics  why not: the QGP, mini serving 60,000 MB events dN ch /d  ~ 50 ! SPSRHICLHC # of partons in proton 3 +  g(x > 2GeV) 41030 Phobos Cu-Cu

3. QM08 J. Schukraft 3 Isn’t that jet physics ?? pp high multiplicity = Jets, we’ve been there (eg LEP)  can one separate the ‘soft’ from the ‘hard’ (e.g with veto on jets) ?  CDF (Phys.Rev.D65:072005,2002 )  STAR (Phys.Rev.D74:032006,2006) Inclusive Soft Hard There are ‘soft’ events up to very high N ch !

4. QM08 J. Schukraft 4 is already known The first result is already known N part scaling won’t work N part scaling won’t work with high multiplicity pp !!  I’m sure WB and BW will work out some other scaling relation.. Cu+Cu Preliminary 15-25%, N part = 61 PHOBOS 62.4 GeV200 GeV Au+Au 45-50%,N part = 62 Cu+Cu Preliminary 15-25%, N part = 60 Au+Au 45-55%, N part = 56

5. QM08 J. Schukraft 5 STAR More interesting studies Particle production: How do we approach fully thermal ratios ??  strangeness under-saturation in pp:  canonical suppression, disconnected sub-volumes, missing final state interactions,…  a ‘thermal analysis’ in pp from dN ch /dy 50 would seem quite interesting  comparison between pp and AA at similar dN/dy  volume/density/lifetime effects ??  some results exist from FNAL and RHIC  limited statistics  (much) lower dN/dy  no separation soft/hard E735 Fermilab N ch Protons Kaons Pions

6. QM08 J. Schukraft 6 From merely exotic to totally crazy Hadronic FSI ?  dn/dy ~ 100 => rescattering => radial flow ?  does size and shape matter for a proton ? => HBT, elliptic flow ? Are partons feeling the pressure ??  coalescence, flow scaling with quark number ??  lepton & photons from parton annihilation ?? Jet quenching, Quarkonia suppression ???  you name it, LHC has it * ….. * maybe. No money back guarantee