Particle Physics in Birmingham

Particle Physics Seminar

Wednesday 16th Novembber 2022 at 13:30

(coffee served at 1315)

Diboson Precision Measurements with the Higgs at LHC and FCC-hh

Alejo Rossia (Manchester University)


The possibility of precision measurements at hadron colliders has attracted much interest over the last few years. Among other processes, diboson production stands out as a way to probe EW and Higgs dynamics and indirectly constrain New Physics. This kind of process is already studied at LHC, despite being handicapped by the need for decay channels with high uncertainties. The higher luminosity and centre-of-mass energy of the future FCC-hh collider would allow us to probe these processes with rarer but cleaner final states that are inaccessible at the LHC. The Wh and Zh production processes constitute an excellent example of this, since they can already be studied at LHC when the Higgs boson decays to bottom-anti-bottom pairs, while FCC-hh would allow us to study them also when the Higgs decays to photons. I will first focus on the diphoton leptonic decay channels of the Wh and Zh production processes and discuss our study of these channels at the FCC-hh in the SMEFT framework. I will show how doubly differential distributions can be used to gain even better sensitivity to certain higher-dimensional EFT operators. I will also compare our projections with those for future lepton colliders to emphasize their complementarity. Then, I'll show our results using the bottom-pair decay channel of the Higgs boson at LHC, HL-LHC and FCC-hh, discuss the limitations of this channel at HL-LHC, and how both Higgs decay channels compare at FCC-hh. Based on arXiv:2004.06122, arXiv:2011.13941, and 2208.11134