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The 29th International Symposium on Lepton Photon Interactions at High Energies will take place in Toronto, Canada between August 5-10, 2019. The Conference follows the tradition of a long series of high energy physics conferences, the International Symposia on Lepton and Photon Interactions at High Energies. The program features plenary sessions covering topics of major interest to the particle physics community. New this year will be two (or three) tracks of parallel sessions for one day, that will provide an opportunity for additional presenters to give a more in-depth presentation of individual physics results. We will also organise poster sessions where additional researchers may present their work.
The conference is hosted by the University of Toronto, and will take place at the Westin Harbour Castle Hotel on the lakefront in downtown Toronto.
Low energy, high luminosity e+ e- colliders are believed to be good places to search for exotic particles predicted in new physics models with dark sector phenomenology. BESIII, as the only running tau-charm factory, has great potential to probe these particles and models with the largest samples of directly produced charmonia. In this talk, we will report the recent results, including search for dark photon using the Jpsi decays in association with a pseudoscalar meson(eta, eta'). In both channels, no significant signal is observed in the mass region from 0.1 to 2.1(2.4) GeV/c2, and the upper limits at the 90% confidence level on the product branching fraction of charmonia to pseudoscalar mesons and the subsequent decay of dark photon to e+e- are set, together with the mixing strength, as a function of dark photon mass.
Talks to be selected from Abstracts received
Talks to be selected from abstracts received
Talks to be selected from Abstracts received
Talks to be selected from Abstracts received
Talks to be selected from abstracts received
Talks to be selected from Abstracts received
Talks to be selected from Abstracts received
Talks to be selected from Abstracts received
Talks to be selected from Abstracts received
The Tile Calorimeter (TileCal) is the hadronic calorimeter covering the central region of the ATLAS experiment. TileCal is a sampling calorimeter with steel as absorber and scintillators as active medium. The scintillators are read-out by wavelength shifting fibers coupled to photomultiplier tubes (PMTs). The analogue signals from the PMTs are amplified, shaped, digitized by sampling the signal every 25 ns and stored on detector until a trigger decision is received. The High-Luminosity phase of LHC (HL-LHC) expected to begin in year 2026 requires new electronics to meet the requirements of a 1 MHz trigger, higher ambient radiation, and for better performance under high pileup. Both the on- and off-detector TileCal electronics will be replaced during the shutdown of 2024-2025. PMT signals from every TileCal cell will be digitized and sent directly to the back-end electronics,
where the signals are reconstructed, stored, and sent to the first level of trigger at a rate of 40 MHz. This will provide better precision of the calorimeter signals used by the trigger system and will allow the development of more complex trigger algorithms. Changes to the electronics will also contribute to the data integrity and reliability of the system.
Results are presented from a prototype of the new electronics
(ìdemonstratorî) that was inserted in a TileCal module and tested in CERNís H8 beamline with electrons, muons, and hadrons. The demonstrator is undergoing extensive testing and will be inserted in the ATLAS detector during the current shutdown.
The scattering of electroweak vector bosons is an important process for the study of the non-abelian gauge-structure of the electroweak sector as well as the nature of electroweak symmetry breaking. Many new physics situations provide amplification of this process and the decay channels which are most sensitive to these effects are the semi-leptonic channels, where one boson decays hadronically and the other leptonically. Searches in these final states exploits novel developments in the use of jet-substructure and machine learning to provide strong signal-to-background separation. This poster will show the results of the search for vector boson scattering in the semi-leptonic channels with 36/fb of 13TeV ATLAS data.
Talks to be selected from Abstracts received
Talks to be selected from Abstracts received
Dinner at Hockey Hall of Fame (30 Yonge St.)