Ilia has some problem sending mail to the list. So I am forwarding his email.
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Hi Takao,
There was some problem sending mail to HBD list, so I repeat it again:
the scintillation rate per pad is:
- the measured (by Craig and guys) absolute yield in CF4 (314 +/- 15)
gammas/MeV;
- # of gammas/track = 314*0.007(dE/dx)*50(cm)=110 gammas/track;
- # of p.e/track=110*0.885(mesh)*0.83(GEM)*0.23(QE)*0.8(eff_t)*2(2
arms)*0.625(dphi)*0.8(deta)=14.8 p.e./track;
- # of p.e/track/pad=14.8/1920=0.0077 p.e./track/pad;
So multiply this number by the charge multiplicity you like and you will
get the desired number which is close to 0. The scintillation is not an
issue for pp, it is even not an issue for peripheral AuAu events, this
"problem" starts to disturbs us in more central AuAu events.
Ilia
On Wed, December 24, 2008 2:16, Takao Sakaguchi said:
> Hi All,
>
> I am now estimating the occupancy in HBD in
> 500GeV p+p run. I extrapolated Werner's pQCD
> calculation provided by Sasha, down to 100MeV/c
> using Hagedorn power-law fit, and computed
> the number of pions we will see in an event.
>
> The result is that we are going to see ~ 3 pi+/-/0
> each in HBD (whole sector). Among them, the major
> contribution seems to be scintillation from pi+/-.
>
> Do we know how many pads will be fired by
> scintillation of a MIP? If we have this number,
> we can estimate the data volume.
>
> Takao
>
>
> _______________________________________________
> Phenix-electron-l mailing list
>
Phenix-electron-l@lists.bnl.gov
>
https://lists.bnl.gov/mailman/listinfo/phenix-electron-l
>
================================
Ilia Ravinovich
Department of Particle Physics
Weizmann Institute of Science
Rehovot 76100
Israel
Phone: 972 8 934 3187
FAX: 972 8 934 4166
E-mail:
Ilia.Ravinovich@weizmann.ac.il
===============================
================================
Ilia Ravinovich
Department of Particle Physics
Weizmann Institute of Science
Rehovot 76100
Israel
Phone: 972 8 934 3187
FAX: 972 8 934 4166
E-mail:
Ilia.Ravinovich@weizmann.ac.il
===============================