[Blackmax] PDF value info

[Shion Chen]

Hi Eram,

Thanks for the fast reply :)

> Some of these quantities are already available but not directly.
> x1 and x2 are available from the 4-vectors of the incoming partons
> these are the first two particle row entries in the <event> xml block
> with status flag -1
> Q2 is stored as the 4th entry in the header part of the <event> xml
> block and can also be calculated from the partonic 4-vectors.


Great!


> f1 and f2 are not stored. But this is maybe not too useful. 


Well, actually I do need them now.
What I'm trying to do is to see whether the proportional relation of BH production cross-section to Rs^2 can be tested in experiment, if the BH is classical-like.
In case of proton collider, it is always convoluted with PDFs and then the truth f1, f2 would be a nice reference in studying methods of the PDF unfolding.
Is there any way to extract it?

Thanks a lot in advance.

Shion

2014/12/22 16:08、Eram Rizvi <e.rizvi at qmul.ac.uk> のメール：

> Hi Shion
> 
> Some of these quantities are already available but not directly.
> x1 and x2 are available from the 4-vectors of the incoming partons
> these are the first two particle row entries in the <event> xml block
> with status flag -1
> 
> Q2 is stored as the 4th entry in the header part of the <event> xml
> block and can also be calculated from the partonic 4-vectors.
> 
> f1 and f2 are not stored. But this is maybe not too useful. Perhaps
> you are more interested in the ID of the parton, i.e. whether it is up
> and down quarks etc? This is stored in the first column of each
> particle row in the <event> xml block.
> 
> The output file follows the LHE standard as it is, so I would not like
> to modify this. Does that help?
> Cheers
> Eram
> 
> 
> On 22 December 2014 at 13:22, Shion Chen <shion.chen at cern.ch> wrote:
>> Dear authors and black hole masters
>> 
>> Hi, I'm now carrying out a feasibility study on differential cross-section
>> measurement of mini black holes and hope to extract truth pdf value (f(x) or
>> xf(x) etc.) of every events.
>> Would it be possible to put all them down in output, like standard LHE
>> format (# x1, x2, Q2, f1, f2).
>> 
>> 
>> Best Regards.
>> 
>> --------------------------------------------------------------------------------------------
>> Shion Chen
>> Department of Physics, School of Science, The University of Tokyo
>> 7-3-1 Hongo, Bunkyo-ku, Tokyo, Japan
>> +81-3-5841-4202
>> chen at icepp.s.u-tokyo.ac.jp
>> shion.chen at cern.ch
>> --------------------------------------------------------------------------------------------
>> 
>> 
>> _______________________________________________
>> Blackmax mailing list
>> Blackmax at projects.hepforge.org
>> https://www.hepforge.org/lists/listinfo/blackmax
>>