GSI Forum
GSI Helmholtzzentrum für Schwerionenforschung

Home » Hades » Pluto » [SOLVED] Beam Smear and Cross Sections
Re: Bear Smear and Cross Sections [message #13894 is a reply to message #13893] Tue, 28 August 2012 01:32
 Michael Kunkel Messages: 53Registered: June 2011 continuous participant From: *hr.hr.cox.net
I do understand that my thoughts are hard to convey, I appreciate the time you are taking with this. I wanted to clarify a typo in my previous message.

 Michael Kunkel wrote on Mon, 27 August 2012 21:07 Is _f the density function? If so, wouldn't using ```Input : _x s cos(theta), _y is differential cross section Output : cross section``` suffice?

I wanted to say

Is _f the density function? If so, wouldn't using
```Input : _x s cos(theta), _y is differential cross section
Output : _f cross section```
suffice?

What I am finding hard to conceive here is how the distribution is generated.

Moreover, I want to clarify what I am trying to do, and hopefully I can understand my mistakes after this.

I have 64 models I will be using. I was assuming I could implement this as

```  model1->SetRange(1.77,1.8);
...
...
...
model64->SetRange(2.56,2.6);

model1->AddHistogram(example1,"value = Eval(_x); _f =_y * value");
...
...
...
model64->AddHistogram(example64,"value = Eval(_x); _f =_y * value");

In the above snipet I use 1 histogram for each model. Each histogram is derived from published data with
```_x = Cos(theta)
_y = Differential Cross section```

The histograms are extrapolated from TGraphs (see below);
c.m. 1.77 ->1.8 GeV

c.m. 2.56 ->2.6 GeV

As it can be seen from the plots above, the cross section depends on both the c.m. energy and Cos(theta);

I am trying to model this, however the example macro you provided states (lines 31 & 32):
```    //Input:  _x is cos(theta), _y is the c.m. energy
//Output: _f: cross section```

model->AddHistogram(distribution,"value = Eval(_x); _f = _y * value");

But cross section, from a physics stand point is proportional to Cos(theta) / s, where s is square of c.m. energy.

This is my a source of my confusion and also not understanding how to use what I already have, cos(theta) vs. diff XSection, is the other part of my confusion.

Thanks

[Updated on: Tue, 28 August 2012 01:34]

Report message to a moderator

 [SOLVED] Beam Smear and Cross Sections By: Michael Kunkel on Tue, 24 July 2012 21:20 Re: Bear Smear and Cross Sections By: Ingo Froehlich on Wed, 01 August 2012 12:45 Re: Bear Smear and Cross Sections By: Michael Kunkel on Wed, 01 August 2012 16:30 Re: Bear Smear and Cross Sections By: Michael Kunkel on Mon, 06 August 2012 20:26 Re: Bear Smear and Cross Sections By: Ingo Froehlich on Mon, 06 August 2012 23:48 Re: Bear Smear and Cross Sections By: Michael Kunkel on Tue, 07 August 2012 00:49 Re: Bear Smear and Cross Sections By: Ingo Froehlich on Tue, 07 August 2012 12:04 Re: Bear Smear and Cross Sections By: Michael Kunkel on Tue, 07 August 2012 16:49 Re: Bear Smear and Cross Sections By: Ingo Froehlich on Wed, 15 August 2012 08:39 Re: Bear Smear and Cross Sections By: Michael Kunkel on Wed, 15 August 2012 15:50 Re: Bear Smear and Cross Sections By: Michael Kunkel on Wed, 15 August 2012 18:56 Re: Bear Smear and Cross Sections By: Ingo Froehlich on Sun, 19 August 2012 17:35 Re: Bear Smear and Cross Sections By: Michael Kunkel on Tue, 21 August 2012 21:29 Re: Bear Smear and Cross Sections By: Michael Kunkel on Thu, 23 August 2012 05:05 Re: Bear Smear and Cross Sections By: Ingo Froehlich on Fri, 24 August 2012 16:28 Re: Bear Smear and Cross Sections By: Michael Kunkel on Fri, 24 August 2012 19:32 Re: Bear Smear and Cross Sections By: Ingo Froehlich on Mon, 27 August 2012 09:22 Re: Bear Smear and Cross Sections By: Michael Kunkel on Mon, 27 August 2012 21:07 Re: Bear Smear and Cross Sections By: Ingo Froehlich on Mon, 27 August 2012 22:59 Re: Bear Smear and Cross Sections By: Michael Kunkel on Tue, 28 August 2012 01:32 Re: Bear Smear and Cross Sections By: Ingo Froehlich on Tue, 28 August 2012 08:35 Re: Bear Smear and Cross Sections By: Ingo Froehlich on Tue, 28 August 2012 08:53 Re: Bear Smear and Cross Sections By: Michael Kunkel on Sun, 02 September 2012 16:11 Re: Bear Smear and Cross Sections By: Ingo Froehlich on Mon, 03 September 2012 16:54 Re: Bear Smear and Cross Sections By: Michael Kunkel on Mon, 03 September 2012 21:17 Re: Bear Smear and Cross Sections By: Michael Kunkel on Wed, 05 September 2012 10:55 Re: Bear Smear and Cross Sections By: Ingo Froehlich on Wed, 05 September 2012 13:30 Re: Bear Smear and Cross Sections By: Michael Kunkel on Wed, 05 September 2012 13:49 Re: Bear Smear and Cross Sections By: Ingo Froehlich on Wed, 05 September 2012 14:00 Re: Bear Smear and Cross Sections By: Michael Kunkel on Wed, 05 September 2012 14:16 Re: Beam Smear and Cross Sections By: Michael Kunkel on Wed, 05 September 2012 15:03 Re: Beam Smear and Cross Sections By: Michael Kunkel on Wed, 19 September 2012 20:17
 Previous Topic: New Pluto web page Next Topic: [SOLVED] PAnyDistribution broke in v5.40.5
Goto Forum:

Current Time: Tue Jun 18 11:56:25 CEST 2024

Total time taken to generate the page: 0.01226 seconds