[EvtGen] S-wave with EvtGen

[Alberto Sanchez-Hernandez]

The current production version of EvtGen at CMS is 1.6.0

       Alberto


On Thu, Jul 26, 2018 at 9:03 AM Giacomo Fedi <giacomo.fedi at cern.ch> wrote:

> 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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