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da0e9ce3 | 1 | /******************************************************************************* |
2 | * Project: BaBar detector at the SLAC PEP-II B-factory | |
3 | * Package: EvtGenBase | |
4 | * File: $Id: EvtBlattWeisskopf.hh,v 1.3 2004/09/14 03:24:11 gowdy Exp $ | |
5 | * Author: Alexei Dvoretskii, dvoretsk@slac.stanford.edu, 2001-2002 | |
6 | * | |
7 | * Copyright (C) 2002 Caltech | |
8 | *******************************************************************************/ | |
9 | ||
10 | // Blatt-Weisskopf penetration form factor for a resonance R->AB. | |
11 | // Taken from CLEO preprint 00-23 (hep-ex/0011065) | |
12 | ||
13 | #ifndef EVT_BLATT_WEISSKOPF_HH | |
14 | #define EVT_BLATT_WEISSKOPF_HH | |
15 | ||
16 | class EvtBlattWeisskopf { | |
17 | ||
18 | ||
19 | public: | |
20 | ||
21 | EvtBlattWeisskopf(int LL, double R, double p0); | |
22 | EvtBlattWeisskopf(const EvtBlattWeisskopf&); | |
23 | ~EvtBlattWeisskopf(); | |
24 | ||
25 | double operator()(double p) const; | |
26 | ||
27 | private: | |
28 | ||
29 | int _LL; // angular momentum of daughters | |
30 | double _radial; // resonance radial parameter | |
31 | double _p0; | |
32 | ||
33 | double _F0; // formula evaluated at _p0 | |
34 | double compute(double p) const; | |
35 | ||
36 | }; | |
37 | ||
38 | #endif | |
39 | ||
40 |