Higgs diffractive 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.

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Higgs Diffractive 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


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