2019/06/18 by D. d’Enterria, David d'Enterria, d'Enterria, David
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High Energy Physics - Phenomenology (hep-ph) #High-Energy Particle Collisions Research #Nuclear Experiment (nucl-ex) #Nuclear Theory (nucl-th) #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ex #hep-ph #nucl-ex #nucl-th
paper · pdf · doi:10.48550/arxiv.1906.07536
4 pages, 6 figures. Contribution to the 2019 Moriond-QCD conference
arxiv created 2019/06/18 · openalex publication_date 2019/06/18 · arxiv updated 2019/06/19 · openalex created_date 2019/06/27 · openalex updated_date 2026/07/28
Higgs boson production in partonic and electromagnetic (photon-photon) interactions of light- and heavy-ions (A-A) at the LHC and future colliders is summarized. Parton-induced cross sections --including gluon-gluon, vector-boson fusion, and associated W, Z, t processes-- are computed at NNLO with MCFM 8.0 using nuclear parton distribution functions. Photon-photon cross sections are computed with MadGraph 5.0 for ultraperipheral A-A interactions with both ions surviving the collision. In the center-of-mass energy range √(s) ≈ 5--100 TeV, the ratio of electromagnetic-to-partonic Higgs cross sections is \rm Re.m./parton ≈ 10-5--10-4. At FCC energies, this ratio is 10--100 times larger in A-A than in p-p thanks to the strong nuclear coherent γ fluxes. The feasibility of Higgs boson measurements at LHC, HE-LHC, and FCC, in the most-favourable H→γγ,bb decay channels in partonic and e.m. interactions respectively, is determined taking into account standard acceptance and efficiency losses on the final states, plus selection criteria to minimize the respective continuum backgrounds. Whereas 3σ evidence for partonic and e.m. Higgs production requires about ×35 and ×200 (×7 and ×30) larger integrated luminosities than those expected for a nominal 1-month run at the LHC (HE-LHC), a 5σ observation of both production modes is warranted in just one month at the FCC.