Hadronic production of a Higgs boson in association with two jets at ...
Hadronic production of a Higgs boson in association with two jets at ...
Hadronic production of a Higgs boson in association with two jets at ...
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6.3. Parameters 149• H¯qq ¯QQ: Ref. [109].These new analytic results have now been <strong>in</strong>cluded <strong>in</strong> the MCFM package, version5.7 (which may be downloaded from mcfm.fnal.gov), lead<strong>in</strong>g to a considerableimprovement <strong>in</strong> the speed <strong>of</strong> the code. For the processes <strong>in</strong>volv<strong>in</strong>g <strong>two</strong> quarkantiquarkpairs, the m<strong>at</strong>rix elements squared given <strong>in</strong> Ref. [104] are implemented <strong>in</strong>MCFM, r<strong>at</strong>her than the amplitudes <strong>of</strong> Ref. [109], because they lead to faster code.The values <strong>of</strong> the amplitudes calcul<strong>at</strong>ed by the new analytic code and the previoussemi-numerical code [105] are <strong>in</strong> full numerical agreement for all amplitudes.The improvement <strong>in</strong> the performance <strong>of</strong> our numerical code means th<strong>at</strong> it isappropri<strong>at</strong>e to revisit the phenomenology <strong>of</strong> <strong>Higgs</strong> + 2 jet <strong>production</strong> and to extendit <strong>in</strong> a number <strong>of</strong> ways. The improvement <strong>in</strong> the speed <strong>of</strong> the code means th<strong>at</strong> it ispossible to <strong>in</strong>clude the decays <strong>of</strong> the <strong>Higgs</strong> <strong>boson</strong>, specifically for the processes:h 1 + h 2 → H + j 1 + j 2 → τ + + τ − + j 1 + j 2 (6.5)h 1 + h 2 → H + j 1 + j 2 → b + ¯b + j 1 + j 2 (6.6)h 1 + h 2 → H + j 1 + j 2 → W − + W + + j 1 + j 2|| → ν + e+| → e − + ¯ν(6.7)h 1 + h 2 → H + j 1 + j 2 → Z + Z + j 1 + j 2|| → e − + e + (6.8)| → µ − + µ +where h 1 , h 2 represent partons <strong>in</strong>side the <strong>in</strong>cident hadron beams. All four <strong>of</strong> theseprocesses are <strong>in</strong>cluded <strong>in</strong> MCFM v5.7.6.3 ParametersThroughout this paper we make use <strong>of</strong> the MSTW2008 parton distribution functions[22], us<strong>in</strong>g the LO fit (α s (M Z ) = 0.13939 and 1-loop runn<strong>in</strong>g) for the lowestorder calcul<strong>at</strong>ion and the NLO fit (α s (M Z ) = 0.12018 and 2-loop runn<strong>in</strong>g) <strong>at</strong> NLO.