[Rivet] MC_HJETS and MC_HINC using ZFinder

[Chris Pollard]

Hi Julia,

It seems to me that the ZFinder is being set up to look between 115 and 125
GeV. Maybe it's time to center this range on 125 GeV.

Chris

On Thu, Mar 26, 2015 at 9:12 AM, Hunt, Julia <julia.hunt at student.kit.edu>
wrote:

> Dear Rivet experts,
>
> I stumbled upon two lines concerning the use of the ZFinder in the two
> analyses MC_HJETS and MC_HINC. In these analyses, ZFinder is abused to get
> a Higgs boson.
>
> ZFinder.hh gives the following constructor:
>
> Rivet-2.2.0:
> 00036     ZFinder(const FinalState& inputfs,
> 00037             const Cut & cuts,
> 00038             PdgId pid,
> 00039             double minmass, double maxmass,
> 00040             double dRmax=0.1,
> 00041             ClusterPhotons clusterPhotons=CLUSTERNODECAY,
> 00042             PhotonTracking trackPhotons=NOTRACK,
> 00043             double masstarget=91.2*GeV);
>
> Rivet-1.9.0:
> 00037    ZFinder(const FinalState& inputfs,
> 00038            double etaMin, double etaMax,
> 00039            double pTmin,
> 00040            PdgId pid,
> 00041            double minmass, double maxmass,
> 00042            double dRmax, bool clusterPhotons, bool trackPhotons,
> 00043            double masstarget=91.2*GeV, bool useDecayPhotons=false);
>
>
> And the analyses don't seem to change the default masstarget:
> Rivet-2.2.0:
> MC_HINC.cc:
> 00025       ZFinder hfinder(FinalState(), cut, PID::TAU, 115*GeV, 125*GeV,
> 0.0, ZFinder::NOCLUSTER);
> MC_HJETS.cc:
> 00028       ZFinder hfinder(FinalState(), cut, PID::TAU, 115*GeV, 125*GeV,
> 0.0, ZFinder::NOCLUSTER);
>
> Rivet-1.9.0:
> MC_HINC.cc:
> 00026      ZFinder hfinder(fs, -3.5, 3.5, 25.0*GeV, TAU, 115.0*GeV,
> 125.0*GeV, 0.0, false, false);
> MC_HJETS.cc:
> 00027      ZFinder hfinder(fs, -3.5, 3.5, 25.0*GeV, TAU, 115.0*GeV,
> 125.0*GeV, 0.0, false, false);
>
> So it seems like the two analyses use the Z mass as a target when looking
> for a Higgs boson.
> Could there be any arguments against changing this masstarget parameter in
> the MC_HJETS and MC_HINC analyses?
>
> Best regards,
> Julia Hunt
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