1 /*******************************************************************************
2 * Project: BaBar detector at the SLAC PEP-II B-factory
4 * File: $Id: EvtBlattWeisskopf.hh,v 1.2 2009-03-16 16:43:40 robbep Exp $
5 * Author: Alexei Dvoretskii, dvoretsk@slac.stanford.edu, 2001-2002
7 * Copyright (C) 2002 Caltech
8 *******************************************************************************/
10 // Blatt-Weisskopf penetration form factor for a resonance R->AB.
11 // Taken from CLEO preprint 00-23 (hep-ex/0011065)
13 #ifndef EVT_BLATT_WEISSKOPF_HH
14 #define EVT_BLATT_WEISSKOPF_HH
16 class EvtBlattWeisskopf {
21 EvtBlattWeisskopf(int LL, double R, double p0);
22 EvtBlattWeisskopf(const EvtBlattWeisskopf&);
25 double operator()(double p) const;
29 int _LL; // angular momentum of daughters
30 double _radial; // resonance radial parameter
33 double _F0; // formula evaluated at _p0
34 double compute(double p) const;