Naming of SingleParticle gen config

[srimanob]

Just accidentally see that we have improper naming of several gun samples when AddAntiParticle = cms.bool(True) is used. The name should be DoubleParticle not SingleParticle as the gen products include 2 particles. This follows the discussion in #33499 (comment).

For example,
https://github.com/cms-sw/cmssw/blob/master/Configuration/Generator/python/SinglePiPt10_pythia8_cfi.py

This file use the same structure, but use Double instead of Single:
https://github.com/cms-sw/cmssw/blob/master/Configuration/Generator/python/DoubleElectronFlatPt1p5To8_cfi.py

It seems there are two ways to make config follows the name convention:

• Set AddAntiParticle = cms.bool(False), so we get single particle or
• Name it as Double

[cmsbuild]

A new Issue was created by @srimanob Phat Srimanobhas.

@Dr15Jones, @perrotta, @dpiparo, @rappoccio, @makortel, @smuzaffar can you please review it and eventually sign/assign? Thanks.

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[makortel]

assign generators

[cmsbuild]

New categories assigned: generators

@mkirsano,@menglu21,@alberto-sanchez,@SiewYan,@GurpreetSinghChahal,@Saptaparna you have been requested to review this Pull request/Issue and eventually sign? Thanks

[Saptaparna]

please test

[makortel]

Umm, there is nothing to test in an issue.

[Saptaparna]

oops, sorry, I am approving too many PRs and accidentally requested a test.