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Higgs Diffractive ProductionPowerPoint Presentation

Higgs Diffractive 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

Concrete possibilities :

1)

Central region (MKKRS)

2)

Heavy quarks in proton

large

p

S. Brodsky

H

B. Kopeliovich

J. Soffer

I. S.

- Large rapidity gap
- Missing mass measurement

1) Non-perturbative (stationary state)

300 MeV

2) Perturbative (quantum fluctuation)

Experimentally:

DIS data, excess at large

Form factors (gluon coupling to all quarks)

Vanish as

(suppression)

Born

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)

( 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

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

- Heavy quark components carry high momentum fractions.
- Higgs production in fragmentation region.
- Diffractive production
- Also possible: , .
- Difficult detection .