[Rivet] Sigma and Cascade at LEP

[Andy Buckley]

Hi Peter,

Sorry, I don't know the answer offhand and have not a lot of time in the
coming days for various reason. I'm copying this to the Rivet mailing
list, where you get the benefit of many informed people other than me!

Andy


On 02/12/10 09:58, Peter Skands wrote:
> Hi Andy,
> 
> We're running the Rivet analysis ALEPH_1996_S3486095 with various
> generators. Most plots look fine, but there are a few where I wonder
> whether Rivet and the data are actually counting the same particles, and
> I just wanted to check with you if you have seen this before or if
> you're getting something different.
> 
> Here's the Sigma(1385) spectrum:
> http://mcplots.cern.ch/?query=plots,ee,zhad,xSigmach1385,All,
> 
> The models are about a factor of 2 from the data. do you think that's
> physics, or a normalization issue? A possible confusing complication
> here is that Sigma(1385)- is *not* the antiparticle of Sigma(1385)+.
> There are a total of four particles which must be counted here, with codes
>  +/- 3224
>  +/- 3114
> 
> Is it easy to check whether the Rivet analysis does this?
> 
> On the Cascade-, instead, I see:
> http://mcplots.cern.ch/?query=plots,ee,zhad,xXi-,All,
> 
> Here, it looks like Rivet may be overcounting the data. According to the
> label, the data is for Cascade- only. Is that what is counted in Rivet?
> 
> Cheers,
> Peter
> 


-- 
Dr Andy Buckley
SUPA Advanced Research Fellow
Particle Physics Experiment Group, University of Edinburgh