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Higgs Diffractive Production. Ivan Schmidt Trieste 2006. Unknown mass Small production probability and large backgrounds Coupling ~ mass hard to observe in pp. But :. 1). Small (1% probability for c) ~. 2). Reduce backgrounds from multiparticle production.
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Higgs Diffractive Production Ivan Schmidt Trieste 2006
Unknown mass • Small production probability and large backgrounds • Coupling ~ mass hard to observe in pp But : 1) Small (1% probability for c) ~ 2) Reduce backgrounds from multiparticle production Diffractive production in fragmentation region of one of the protons Higgs detection
Concrete possibilities : 1) Central region (MKKRS) 2) Heavy quarks in proton large p S. Brodsky H B. Kopeliovich J. Soffer I. S. p p p H p • Large rapidity gap • Missing mass measurement
1) Non-perturbative (stationary state) 300 MeV 2) Perturbative (quantum fluctuation) Experimentally: DIS data, excess at large Large production
Form factors (gluon coupling to all quarks) Vanish as (suppression) Born Exclusive diffraction calculation
1) Factorized form for proton wf 2) Calculate at t=0 , and assume Pomeron-type t-dependence 3) Replace two-gluon proton vertex by gluon density Includes higher order corrections fitted to data Only odd powers of change of orbital angular momentum • initial in S-wave • final in P-wave H is scalar ( different for : P-wave initial state) Calculational steps
( for and ) ( for ) 5) wavefunction ( FT of energy denominator ) 6) Relative motion of and qqq clusters a) Non-perturbative heavy flavors b) Perturbative heavy flavors 4) Higgs wavefunction (P-wave)
Non-perturbative Perturbative Perturbative Final result • For LHC energy (14 TeV cm) • Perturbative heavy flavors • Includes absorptive corrections ( 20% at LHC) • IT falls for GeV • Heavy quark probability ~
1) From colorless heavy pair Does not have proton form factor But Amplitude suppressed 2) Nuclear enhancement Not as big as one might think Stronger absorptive corrections Factor of ~ 10 for Pb Larger cross section
Heavy quark components carry high momentum fractions. • Higgs production in fragmentation region. • Diffractive production • Also possible: , . • Difficult detection . Conclusions