Re: [Brahms-dev-l] spectra from pp collsion at eta = 2.2 (fwd)

-- 
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Zhongbao YIN                 Phone:  +47-55-582792 (O)
Address:                             +47-55-276803 (H)
  Fantoftveien 14G 466       E-mail:
  5075  Bergen                  Yin.Zhongbao@fi.uib.no
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---------- Forwarded message ----------
Date: Thu, 11 Dec 2003 19:03:44 +0100 (CET)
From: yin.zhongbao@fi.uib.no
To: flemming videbaek <videbaek@bnl.gov>
Subject: Re: [Brahms-dev-l] spectra from pp collsion at eta = 2.2

I can only give you a quick answer today since I have to leave soon.

On Thu, 11 Dec 2003, flemming videbaek wrote:

> Dear Zhangbao,
> 
> On a multi-decade plots this certainly looks good, But without some details
> from your analysi it is very difficult
> to judge if this is good enpough for a RAu ratio. As you know Ramiro has
> also analysied these data are there seem to
> be significant differences, maybe a factor 2, at higher pt, while at lower
> they are much closer ?
> 
> Since you will be presenting this at QM the collaboration needs to see some
> details/documentation on top of the ppt
> that I saw at the coll meeting maybe you have a web page that can help us
> all. Some questions
> 
> - what set of runs have you been using ? ( pp..) (give list of run no's)

A427: 8834 8838 8839 8840
A843: 8855 8862 8863 8867 8868 8869 8871 8874 8875 8877
A1692: 8881 8885 8886 8889 8890 8891 8892 8893 8894 8896 8897 8900 8901 
8902 8905 8906 8907 8909 8910 8913


> - what vertex do you use when picking an acceptance map. Is it done with
> standard 5 cm bins.
>    how good is the matching vs data.

Inel Vtx from -20 to 20. It is done with 5cm bin. Data matches acceptance 
very well. The maps was generated for AuAu run with the setting. I have 
problem of acceptance map in mid-rapidity as I showed in collaboration 
meeting. While data from 90B1050 for dAu  match almost with map 90B1000 
which was generated for AuAu run, but very much off map generated recently 
for 90B1050. I just wonder if there is any changes on field map table in 
brag after meeting in Krakow. 

> - what vertex range (inel, and/or track vertex do you pick).

vertex range from inelVtx from -20 to 20

> - the ratio between pions and h- jumps by a large amount at pt~1. Is this
> beacuse of different run or due to
>    change in PID. It does not look physical but experimental.

That's due to two different setting 12A427, 12A843. PID for 12A427 is done 
by combining H2 and RICH pid information, trust H2 pid first. PID for 
12A843 and 12A1692 is done with RICH only.

> - what effecinecies are you using (tracking, PID...)

Tracking efficiency has applied using Pawel's file for AuAu run, and a 
centrality 60 is assumed so that I can use them. This is not ideal, and 
may be wrong (from outcome, histogram shows when p > 6, efficiency 1 is 
assumed, this may be wrong, I have to look into it tommorrow). But what I 
can do? Any ideas?
 
H2 Pid efficiency is from hitSlat/pointedSlat
RICH efficiency with 0.97 is applied at the moment, since index of 
refraction is changed very much from AuAu run to pp run 2003, RICH
efficiency have to be studied later.

> - your statistcis seems off hand much better than Ramiro's selected runs- we
> should compare this.
> - what 'version of dst are in use.This is important due to the different
> inel calibrations in use.

Version 6 of dst is used.

> 
> cheers
>     Flemming
> 
> 
> ----------------------------------------------------------------
> Flemming Videbaek
> Physics Department
> Brookhaven National Laboratory
> 
> e-mail: videbaek@bnl.gov
> phone: 631-344-4106
> ----- Original Message ----- 
> From: <yin.zhongbao@fi.uib.no>
> To: <brahms-dev-l@lists.bnl.gov>
> Sent: Thursday, December 11, 2003 9:19 AM
> Subject: [Brahms-dev-l] spectra from pp collsion at eta = 2.2
> 
> 
> > Dear Collaborators.
> >
> > Here attached are spectra for h^- and pi^- at eta = 2.2 for pp
> > collions at 200 GeV. Could you have a look to see if it is reasonable?
> > I would like to use them as a reference spectrum to calculate R_AA and
> > R_dA if no objection.
> >
> > By the way, could someone tell me the average number of bininary collsions
> > for dAu at centrality bins 0-30%, 30-60% and 60-92%?
> >
> > Thank you very much for your kind help!
> >
> > Best regards,
> > Zhongbao
> > -- 
> > -----------------------------------------------------
> > Zhongbao YIN                 Phone:  +47-55-582792 (O)
> > Address:                             +47-55-276803 (H)
> >   Fantoftveien 14G 466       E-mail:
> >   5075  Bergen                  Yin.Zhongbao@fi.uib.no
> > ------------------------------------------------------
> >
> 
> 
> ----------------------------------------------------------------------------
> ----
> 
> 
> > _______________________________________________
> > Brahms-dev-l mailing list
> > Brahms-dev-l@lists.bnl.gov
> > http://lists.bnl.gov/mailman/listinfo/brahms-dev-l
> >
> 
> 

-- 
-----------------------------------------------------
Zhongbao YIN                 Phone:  +47-55-582792 (O)
Address:                             +47-55-276803 (H)
  Fantoftveien 14G 466       E-mail:
  5075  Bergen                  Yin.Zhongbao@fi.uib.no
------------------------------------------------------



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