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What else can one do with pp@LHC ?

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 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, …..

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What else can one do with pp@LHC ?

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  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 of rate : L: 1030 - 1034cm-2s-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. Global pp event properties • Multiplicity distribution at LHC • quite respectable particle densities • dNch/dh ~ 50 – 100 can be reached ! • > central S+S @ SPS, mid-central Cu-Cu @ RHIC • naïvely, energy density e > 5 – 10 GeV/fm3 • t0 = 1 fm, V = 5 fm3 • 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 dNch/dh ~ 50 ! Phobos Cu-Cu

  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 Nch !

  4. 62.4 GeV 200 GeV PHOBOS PHOBOS Cu+Cu Preliminary 15-25%, Npart = 61 Cu+Cu Preliminary 15-25%, Npart = 60 Au+Au 45-55%, Npart = 56 Au+Au 45-50%,Npart = 62 The first resultis already known • Npart scaling won’t work with high multiplicity pp !! • I’m sure WB and BW will work out some other scaling relation..

  5. STAR Protons Kaons <pT> Pions Nch E735 Fermilab 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 dNch/dy < 5 to > 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

  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

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