[EvtGen] S-wave with EvtGen

[Giacomo Fedi]

Hi John,

thank you for your answer. I'm looking forward to see the S-wave and the
other "extra" models in the HepForge repository.

@Alberto, is the CMS version on the same page of the mentioned repository?

Best,
Giacomo.

On Wed, Jul 25, 2018 at 2:04 PM John Back <J.J.Back at warwick.ac.uk> wrote:

> Hi Giacomo,
>
> > On 16/07/18 10:12, Giacomo Fedi wrote:
> > Hi EvtGen authors,
> >
> > I was wondering if it is now possible to produce samples of P+S wave
> > in the JpsiPhi decay. In principle we would need an improved PVV_CPLH
> > model which right now is simulating only the P-wave.
> >
>
> After carefully rechecking the LHCb EvtGen repository, we have found
> that there is in fact a model that generates Bs -> J/psi (mu mu) K K
> decays which includes the phi and f0 resonances as well as a
> non-resonant S-wave component, with decay time dependence.
>
> It it called EvtBsMuMuKK and uses the amplitude formulae from PRD 87,
> 072004 (2013), although the model imposes an ad-hoc K+K- kinematic upper
> mass limit of 1.2 GeV (specified via a decay file parameter) since there
> are issues extending it up to 2.3 GeV or so.
>
> We will try to make this model available, along with the useful ones
> currently in the LHCb EvtGenExtras package, in our HepForge repository
> and release it around the timescale of September/October, owing to the
> summer holiday period.
>
> Regards,
>         John.
>
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