Store x1 and x2, plus add the mass for high mass gen particles

[arizzi]

as @azzurip suggested we should store Energy rather than Mass for GenPart so that incoming partons x1, x2 can be computed

[gpetruc]

i'd rather store x1 and x2 separately.

for most of the other particles, the mass is both more practical and better compressed.

Giovanni

Il 11 Ott 2017 09:17, "arizzi" notifications@github.com ha scritto:

as @azzurip suggested we should store Energy rather than Mass for GenPart so that incoming partons x1, x2 can be computed

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[arizzi]

another option is to store pz or energy only for particles with eta > 1000 "?abs(eta)>1000?E():0"

[arizzi]

@azzurrip

[azzurrip]

Ok the pz of partons at very large eta seems fine to me

[arizzi]

@gpetruc do you have a definition of x1 and x2 that is good for all generators? Othwise I'd go for eta >1000 and store pz of all of them

[arizzi]

I mean: are we sure that x1 and x2 can be taken from first two genparts?

[gpetruc]

the x1 and x2 are in the generator block

Il 11 Ott 2017 12:34, "arizzi" notifications@github.com ha scritto:

I mean: are we sure that x1 and x2 can be taken from first two genparts?

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[azzurrip]

Would also be nice to have the incoming parton ids of the hard process.

On 11 Oct 2017, at 13:00, Giovanni Petrucciani notifications@github.com<mailto:notifications@github.com> wrote:

the x1 and x2 are in the generator block

Il 11 Ott 2017 12:34, "arizzi" notifications@github.com<mailto:notifications@github.com> ha scritto:

I mean: are we sure that x1 and x2 can be taken from first two genparts?

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[gpetruc]

https://github.com/cms-sw/cmssw/blob/master/SimDataFormats/GeneratorProducts/interface/GenEventInfoProduct.h ---> https://github.com/cms-sw/cmssw/blob/master/SimDataFormats/GeneratorProducts/interface/PdfInfo.h

On Wed, Oct 11, 2017 at 1:57 PM, azzurrip notifications@github.com wrote:

Would also be nice to have the incoming parton ids of the hard process.

On 11 Oct 2017, at 13:00, Giovanni Petrucciani <notifications@github.com< mailto:notifications@github.com>> wrote:

the x1 and x2 are in the generator block

Il 11 Ott 2017 12:34, "arizzi" <notifications@github.com<mailto: notifications@github.com>> ha scritto:

I mean: are we sure that x1 and x2 can be taken from first two genparts?

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or mute the thread https://github.com/notifications/unsubscribe-auth/AEbbR8gshSWiz- Edh2YXHQhNwf1C_RT9ks5srJnKgaJpZM4P1BEg .

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[arizzi]

• mass for all => 48byte/ev
• mass for m > 1 GeV => 27 byte ev
• m >10 or (pdgId=22 && m>1) => 17byt/ev

[arizzi]

what is the difference between "x" and "xPDF" and which one do we want to store?

[arizzi]

@perrozzi @bendavid can some of you clarify the difference between x and xPDF ?

[arizzi]

54