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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

Higgs Diffractive Production

Ivan Schmidt

Trieste 2006


Higgs detection

  • 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


P p p h p

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


Large production

1) Non-perturbative (stationary state)

300 MeV

2) Perturbative (quantum fluctuation)

Experimentally:

DIS data, excess at large

Large production


Exclusive diffraction calculation

Form factors (gluon coupling to all quarks)

Vanish as

(suppression)

Born

Exclusive diffraction calculation


Calculational steps

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


4 higgs wavefunction p wave

( 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)


Higgs diffractive production

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 ~


Larger cross section

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


Conclusions

Conclusions