New-Gauge-Boson Processes in Pythia8175

-production of new Z’^0 and W’^+- gauge bosons, e.g. within the context of a new U(1) or SU(2) gauge group, and also a (rather speculative) horizontal gauge boson R^0.

-gamma^*/Z^0/Z’^0 interference structure for couplings to fermion pairs.

The R^0 boson (particle code 41) represents one possible scenario for a horizontal gauge boson, i.e. a gauge boson that couples between the generations, inducing processes like s dbar -> R^0 -> mu^- e^+.

“NewGaugeBoson:ffbar2R0 = on”

The cross section for this process is 2.955e-11 mb.

pythia8->ReadString(“41:onMode = off”);          //cancel all decays channels
pythia8->ReadString(“41:onIfAny =3 -5 “);          // R0->s + bbar

TLorentzVector s, bbar, R;

R=s + bbar

Double_t invariant mass = R.M();

cout << ” Invariant mass of s-bbar pair is ” << invariant mass << endl;

In this mode , I determined invariant mass of s-bbar pair and I obtained 589.419 Gev, which is exactly mass of the R^0 boson.


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