# QCD form factors

1. Jul 1, 2008

### plasmon

Dear friends, i was working on a hadronic decays. It appears that one has to calculate form factors. These form factors involve some very complex numerical integration. I would like to know if there are some packages available for calculating these form factors.

2. Jul 1, 2008

### humanino

Hi,

which form factors more specifically ? If you need all possible of them, it's going to be difficult Some of them are fairly (or very) well known.

3. Jul 2, 2008

### plasmon

I was working on semileptonic B decays.

4. Jul 2, 2008

### humanino

There are some data on that, such as :
Measurements of the B to D* Form Factors Using the Decay B0 --> D* e nu_e

There are model calculations such as
Form Factors for Exclusive Semileptonic $B$--Decays
but this may be old. A paper giving references to B-FFs :
A Study of Exclusive Charmless Semileptonic B Decays and Extraction of |V_{ub}| at CLEO
Another, older :
Measurement of Exclusive $B \to X_u \ell \nu$ Decays with $D^{(*)} \ell \nu$ Decay Tagging
They also both point to lattice calculations.

If your goal is to make a new calculation, holographic is fancy lately
Electromagnetic Baryon Form Factors from Holographic QCD
(posted today)