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Lambda-Lambdabar model in EvtGen [message #16172]

Wed, 02 April 2014 01:09

donghee
Messages: 385
Registered: January 2009
Location: Germnay

first-grade participant

From: *dip0.t-ipconnect.de

Hi,

To do more realistic MC simulation for lambda lambdabar production, I have a look the EvtLambdaLambdaBar.cpp.
Below 2.5 GeV the parameterization is not valid any more. I am wondering that this private model can be used with P_beam > 3GeV?

In DPM MC, anti-lambda would be boosted into the forward direction, that is reported by FTOP group report in last collaboration meeting.
I am wondering whether an effective way to have such effect within EvtGen and can control in generator level specially with EvtGen framework or not?

There are also three different models in EvtGen/Private with "", "HE" and "Pol", I guess some polarization effect can be controlled with some option.
Where can I find the instruction or reference for these Models.
Could you make some comment on that?

Best wishes,
Donghee

[Updated on: Wed, 02 April 2014 01:10]

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Re: Lambda-Lambdabar model in EvtGen [message #16173 is a reply to message #16172]

Wed, 02 April 2014 08:57

StefanoSpataro
Messages: 2736
Registered: June 2005
Location: Torino

first-grade participant

From: *dip0.t-ipconnect.de

What does it mean that the EvtLambdaLambdaBar is not valid anymore below 2.5 GeV/c?

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Re: Lambda-Lambdabar model in EvtGen [message #16174 is a reply to message #16172]

Wed, 02 April 2014 10:34

donghee
Messages: 385
Registered: January 2009
Location: Germnay

first-grade participant

From: *kph.uni-mainz.de

Hi Stefano,

I misunderstood and misread the EvtLambdaLambdaBar code.
Above 2.5 GeV and below 2.5 GeV has only different parameterization, all pbar beam momentum ranges are correctly handled in the code.
The momentums in lambdabar and lambda simulation data are asymmetrically distributed as I expect.

However, I assume that EvtLambdaLambdaBarPol is the most advanced version for l lbar production. Is it correct?

Best regards,
Donghee

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Re: Lambda-Lambdabar model in EvtGen [message #16175 is a reply to message #16174]

Wed, 02 April 2014 11:00

StefanoSpataro
Messages: 2736
Registered: June 2005
Location: Torino

first-grade participant

From: *dip0.t-ipconnect.de

EvtLambdaLambdaBarPol works only for low momenta (< 2.5 GeV/c). It is setting also the spin density, which is not set in the EvtLambdaLambdaBar model.

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