gauge test failures and ZAlign warnings in wwjj generation

[Generic User (don't modify these fields)]

Hi,

When I use this run card with sherpa version 2.1.1

​http://t3serv001.mit.edu/~anlevin/for_sherpa_ticket_15Dec2014/sherpa_run.dat

I see this output

​http://t3serv001.mit.edu/~anlevin/for_sherpa_ticket_15Dec2014/sherpa_output_5.txt

There are two kinds of messages I am worried about:

1) ZAlign::ZAlign(): Q = 85.4593 vs. 12.2497, rel. diff. -nan

and

2)

Amplitude::GaugeTest(): Large deviation {

2.46869973838e-26

vs 2.46869973874e-26 => -1.48038581393e-10

}

I noticed that when I use Order_EW 4; Order_QCD 2; instead of Order_EW 6; Order_QCD 0; neither problem occurs.

Thanks.

Andrew

[Stefan Hoeche]

Hi Andrew,

the gauge violations are very small and might well be just a numerical issue. The ZAlign warnings should disappear upon using EXCLUSIVE_CLUSTER_MODE=1 (on the command line or in the (run) section).

Cheers Stefan

[Stefan Hoeche]

Please reopen ticket if the problem persists.