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Observables for possible QGP signatures in central pp collisions

Proton–proton (pp) data show collective effects, such as long-range azimuthal correlations and strangeness enhancement, which are similar to phenomenology observed in heavy ion collisions. Using simulations with and without explicit existing models of collective effects, we explore new ways to probe pp collisions at high multiplicity, in order to suggest measurements that could...

\(hh+\text {Jet}\) production at 100 TeV

Higgs pair production is a crucial phenomenological process in deciphering the nature of the TeV scale and the mechanism underlying electroweak symmetry breaking. At the Large Hadron Collider, this process is statistically limited. Pushing the energy frontier beyond the LHC’s reach will create new opportunities to exploit the rich phenomenology at higher centre-of-mass energies...

Gluon PDF constraints from the ratio of forward heavy-quark production at the LHC at \(\sqrt{S}=7\) and 13 TeV

We discuss production of charm and bottom quarks at forward rapidity in pp collisions at the LHC, updating the QCD predictions for the run at \(\sqrt{S}=13\) TeV. We show that, while the absolute rates suffer from large theoretical systematics, dominated by scale uncertainties, the increase relative to the rates precisely measured at 7 TeV can be predicted with an accuracy of a...

Lepton flavour violating top decays at the LHC

We consider lepton-flavour violating decays of the top quark, mediated by 4-fermion operators. We compile constraints on a complete set of SU(3) \(\times \) U(1)-invariant operators, arising from their loop contributions to rare decays and from HERA’s single-top search. The bounds on e–\(\mu \) flavour change are more restrictive than on \(\ell \)–\(\tau \); nonetheless the top...

Cross section ratios between different CM energies at the LHC: opportunities for precision measurements and BSM sensitivity

Michelangelo L. Mangano 0 Juan Rojo 0 0 PH Department, TH Unit , CERN, CH-1211 Geneva 23, Switzerland The staged increase of the LHC beam energy provides a new class of interesting observables

Constraints on the gluon PDF from top quark pair production at hadron colliders

Using the recently derived NNLO cross sections [1], we provide NNLO+NNLL theoretical predictions for top quark pair production based on all the available NNLO PDF sets, and compare them with the most precise LHC and Tevatron data. In this comparison we study in detail the PDF uncertainty and the scale, m t and α s dependence of the theoretical predictions for each PDF set. Next...

Theoretical predictions for charm and bottom production at the LHC

We present predictions for a variety of single-inclusive observables that stem from the production of charm and bottom quark pairs at the 7 TeV LHC. They are obtained within the FONLL semi-analytical framework, and with two “Monte Carlo + NLO” approaches, MC@NLO and POWHEG. Results are given for final states and acceptance cuts that are as close as possible to those used by...

Four statements about the fourth generation

This summary of the Workshop "Beyond the 3-generation SM in the LHC era" presents a brief discussion of the following four statements about the fourth generation: 1) It is not excluded by EW precision data; 2) It addresses some of the currently open questions; 3) It can accommodate emerging possible hints of new physics; 4) LHC has the potential to discover or fully exclude it...