HE-LHC: The High-Energy Large Hadron Collider

Higgs-pair production via gluon fusion at hadron colliders: NLO QCD corrections

“…We extend the results presented in Ref. [27] and study not only the LHC at center-of-mass energies of 13 and 14 TeV, but also present numbers for a potential high-energy upgrade of the LHC (HE-LHC) at 27 TeV [38] and for a provisional 100 TeV proton collider within the Future-Circular-Collider (FCC) project [39,40]. Special emphasis will be given to the study of the theoretical uncertainties affecting the results and in particular the scale and scheme uncertainty related to the top-quark mass.…”

Sensitivity of future hadron colliders to leptoquark pair production in the di-muon di-jets channel

“…We hope that the results of our study will be useful for the current European Strategy in Particle Physics [69] and provide a part of the physics case for future hadron colliders [36][37][38][39].…”

“…At the same time, direct searches for new particles [36] may include S 3 . One potential future LHC upgrade would be to insert 16 Tesla magnets into the current LHC ring, resulting in the high energy LHC (HE-LHC), running at a nominal energy of 27 TeV with a design integrated luminosity of 15 ab −1 [37]. Ultimately, such magnets could be placed within a much larger tunnel, resulting in the Future Circular Collider, which could collide protons (FCC-hh) at a centre of mass energy √ s = 100 TeV with a design luminosity of 20 ab −1 [38,39].…”

Doubly charged Higgs boson production at hadron colliders

“…We briefly remark that the O(100) zb cross sections at √ s = 100 TeV are incredibly tiny. However, the proposed integrated luminosity goals for such potential machines are of L = 30 − 50 −1 ab [51][52][53][54][55], indicating that O(3 − 5) triplet pairs with masses of O(10) TeV could be produced in such a collider.…”

“…In light of these impediments to studying the canonical Type II Seesaw model, we revisit the modeling of triplet Higgs boson production at current and proposed [51][52][53][54][55] hadron collider facilities. Though our work holds for all mass eigenstates arising from the scalar triplet field∆, for conciseness, we limit our investigation to the pair and associated production of the doubly charged scalar ∆ ±± .…”