Diffraction at LHC (How to turn LHC into a 14 TeV Gluon Factory ?) stolen from Risto Orava University of Helsinki and Helsinki Institute of Physics Workshop.

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Presentation transcript:

Diffraction at LHC (How to turn LHC into a 14 TeV Gluon Factory ?) stolen from Risto Orava University of Helsinki and Helsinki Institute of Physics Workshop on Diffractive Physics 4. – 8. February 2002 Rio de Janeiro, Brazil

For forward physics processes need to extend the base line experiments. Elastic protons Single Diffraction Double Diffraction Double Pomeron Non-Diffractive

Diffraction is mostly beyond the reach of large baseline experiments at LHC (ATLAS & CMS). What should be done to increase their coverage in the forward region? (1) Leading proton measurement (2) Upgrade forward detectors: ATLAS + A Foward Spectrometer CMS + TOTEM Roman Pots and MicroStations

A novel detector for measuring the leading protons - the Microstation© - is designed to comply with the LHC requirements. a compact and light detector system (secondary particle emission, dimensions < 20cm, weight < 2kg) integrated with the beam vacuum chamber (acceptance) geometry and materials compatible with the machine requirements (dynamic vacuum (outgassing atm, bake-out to 180 C), RF impedance (< 0.6m  /ms), em pick-up)  m accurcay in sensor movements (alignment) robust and reliable to operate (access limitations) Si strip or pixel detector technology (heat dissipation (< 50 mW), simplicity & radiation hardness (n flux 10 5 kHz/cm 2, 0.25  m CMOS read-out chips fully functional up to 30Mrad)) ©M.Ryynänen, R.O. et al.

Inner tube for rf fitting Inch worm motor Emergency actuator Detector Space for cables and cooling link Space for encoder 6cm Microstation Helsinki group/M. Ryynänen, R.O. et al.

Expected Performance -Observables Charged particles from inelastic events: –Pseudorapidities:3 <  < 7 (5.7 <  < 8.4) with nominal LHC optics Leading protons: Detector locationLeading p (  *=1100m) Leading p (  *=0.5m) 180 m-t > 7.0  GeV 2  > 0.03 (0.02) 240 m -t > 3.5  GeV 2  > m-t >  > (0.002) Missing mass in pp  p + M X + p ?

As a Gluon Factory LHC could deliver ,000 high purity (q/g = 1/3000) gluon jets with E T > 50 GeV in 1 year; gg-events as “Pomeron-Pomeron” luminosity monitor Possible new resonant states, e.g. Higgs (250 H  bb events per year with m H = 120 GeV, L=10 34 )*, glueballs, quarkonia 0 ++ (  b ), gluinoballs - background free environment (bb, WW &  decays) Squark & gluino - practically background free signature: multijets & missing transverse energy - model independence (missing mass!) - expect events for gluino/squark masses of 250 GeV Several events with isolated high mass  pairs, extra dimensions *V.Khoze, Martin & Ryskin, Boonekamp, Peschanski, Royon,...