Journal Club

Seminar Room

Monday 3rd of October, 2016

Hour: 10:00

Title: Energy helps accuracy: electroweak precision tests at hadron colliders

Presented by: José Santiago Pérez

Ref: https://arxiv.org/abs/1609.08157v1

Abstract:

We show that high energy measurements of Drell-Yan at the LHC can serve as electroweak precision tests. Dimension-6 operators, from the Standard Model Effective Field Theory, modify the high energy behavior of electroweak gauge boson propagators. Existing measurements of the dilepton invariant mass spectrum, from neutral current Drell-Yan at 8 TeV, have comparable sensitivity to LEP. We propose measuring the transverse mass spectrum of charged current Drell-Yan, which can surpass LEP already with 8 TeV data. The 13 TeV LHC will elevate electroweak tests to a new precision frontier.

Hour: 10:00

Title: The Protophobic Light Vector Boson as a Mediator to the Dark Sector

Presented by: Roberto Vega-Morales

Ref: https://arxiv.org/abs/1609.01605v1

Abstract:

Observation of a protophobic 16.7 MeV vector boson has been reported by a 8Be nuclear transition experiment. Such a new particle could mediate between the Standard Model and a dark sector which includes the dark matter. In this Letter, we show some simple models which satisfy the thermal relic abundance under the current experimental bounds from the direct and the indirect detections. In a model, it is found that an appropriate self-scattering cross section to solve the small scale structure puzzles can be achieved.