Create a new particle with spin 3/2

Dear Yeng-Ming,

Indeed spin3/2 is not supported by the official version of MG5 at
current stage.
The main raison up to a couple of month ago that FeynRules was not
able to create a valid model
for such particles.
Now this is done. At that time we face that ALOHA had some problem
with spin3/2 as well.
I fixed the spin3/2 problem in ALOHA, but the validation is not
finished.

I can point to you this beta version if you want. (Do you have bazaar
instaled on your computer? Otherwise I can create a tarball) But off
course since the validation is not finished,
you will need to triple check everything.

Cheers,

Olivier

On 07-mai-12, at 18:45, Yeng-Ming Tzeng wrote:

> New question #196413 on MadGraph5:
> https://answers.launchpad.net/madgraph5/+question/196413
>
> Dear experts,
>
> I want to create a new particle with spin 3/2, and started from
> models/4Gen.
>
> For example, in "particles.py"
> tp = Particle(pdg_code = 8,
> name = 'tp',
> antiname = 'tp~',
> spin = 4, <----------------
> Using spin 3/2
> color = 3,
> mass = Param.MTp,
> width = Param.WTp,
> texname = 'tp',
> antitexname = 'tp',
> charge = 2/3,
> LeptonNumber = 0,
> GhostNumber = 0)
>
> Then I executed "./bin/newprocess_mg5", but got an error message :
>
> ######### Error Message -- START -- ############
> "output -f" with error:
> PhysicsObjectError : No helicity state assignment for spin 4 particles
> Please report this bug on https://bugs.launchpad.net/madgraph5
> More information is found in 'MG5_debug'.
> Please attach this file to your report.
> done
> No diagrams for this process!
>
> In MG5_debug:
> PhysicsObjectError: No helicity state assignment for spin 4 particles
>
> In madgraph/core/base_objects.py :
> There is no helicity states for the spin-3/2 case
> ######### Error Message -- END -- ############
>
> Could experts give me a suggestion?
> Many thanks.
>
> Best regards,
> Jacky
>
> --
> You received this question notification because you are a member of
> MadTeam, which is an answer contact for MadGraph5.

Dear Olivier,

Thanks for your reply.

I think that I need your instruction and the tarball file.

Cheers,
Jacky

Could you send me your email (or send me one email at
olivier.mattelaer_AT_uclouvain.be
such that I can send you the tarball by email.

Cheers,

Olivier

On 08-mai-12, at 03:50, Yeng-Ming Tzeng wrote:

> Question #196413 on MadGraph5 changed:
> https://answers.launchpad.net/madgraph5/+question/196413
>
> Status: Answered => Open
>
> Yeng-Ming Tzeng is still having a problem:
> Dear Olivier,
>
> Thanks for your reply.
>
> I think that I need your instruction and the tarball file.
>
> Cheers,
> Jacky
>
> --
> You received this question notification because you are a member of
> MadTeam, which is an answer contact for MadGraph5.