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Opened 17 years ago

Closed 17 years ago

Last modified 10 years ago

#3 closed defect (invalid)

dependence of cross section on JetFinder ycut

Reported by: ploscutoff@gmail.com Owned by: support@sherpa-mc.de
Priority: minor Milestone:
Component: Unknown Version: 1.0.9
Keywords: Cc:

Description

I have been generating Z->ee + N={0,1,2,} parton events via Sherpa, but have noticed a significant dependence of my total interaction cross section on the value of ycut in the jetfinder algorithm of Selector.dat.

* JetFinder sqr(10/14000) 1

The ycut refering to sqr(10/14000) in this example.

Is there a default value that this parameter? If so, what is the basis for choosing it?

Attached are the .dat files used in my setup.

Attachments (1)

sherpa.setup.tar​ (60.0 KB) - added by ploscutoff@gmail.com 17 years ago.

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Change History (4)

Changed 17 years ago by ploscutoff@gmail.com

Attachment: sherpa.setup.tar​ added

comment:1 Changed 17 years ago by Frank Siegert

Resolution: → invalid
Status: new → closed

This has been answered by Frank Krauss by email, thus closing this bug in the bugtracker:

In fact this is not a bug, but a feature of the method, as outlined in both our manual and the corresponding papers. Basically, it is due to the fact that, after all, you are considering a LO cross section, with all imperfections and instabilities related to changes in factorisation scales etc..

comment:2 Changed 12 years ago by Frank Siegert

Milestone: → rel-old

comment:3 Changed 10 years ago by Stefan Hoeche

Milestone: old

Milestone old deleted

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