NPAC (Nuclear/Particle/Astro/Cosmo) Forums |
Organized by: Prof. Lu Lu
Events During the Week of December 10th through December 17th, 2017
Monday, December 11th, 2017
- No events scheduled
Tuesday, December 12th, 2017
- Evidence for the Higgs Boson Decay to a Bottom Quark-Antiquark Pair
- Time: 2:30 pm
- Place: 4274 Chamberlin Hall
- Speaker: Stephane Cooperstein, Princeton
- Abstract: A search for the standard model (SM) Higgs boson (H) decaying to bb when produced in association with an electroweak vector boson is reported for the following processes: Z(νν)H, W(μν)H, W(eν)H, Z(μμ)H, and Z(ee)H. The search is performed in data samples corresponding to an integrated luminosity of 35.9 fb−1 at √s = 13 TeV recorded by the CMS experiment at the LHC during Run 2 in 2016. An excess of events is observed in data compared to the expectation in the absence of a H → bb signal. The significance of this excess is 3.3 standard deviations, where the expectation from SM Higgs boson production is 2.8. The signal strength corresponding to this excess, relative to that of the SM Higgs boson production, is 1.2 ± 0.4. When combined with the Run 1 measurement of the same processes, the signal significance is 3.8 standard deviations with 3.8 expected. The corresponding signal strength, relative to that of the SM Higgs boson, is 1.06+0.31. −0.29
- Host: Sridhara Dasu
Wednesday, December 13th, 2017
- Search for New Physics with the Top Quark
- Time: 2:30 pm
- Place: 4274 Chamberlin Hall
- Speaker: Kevin Black , Boston University
- Abstract: The top quark is the heaviest known elementary particle: with a mass as large as an entire gold atom and the only fermion with a natural Yukawa coupling. Millions of top quarks have been produced at the LHC allowing precise measurements of its properties that have been compared with Standard Model predictions. The high center-of-mass energy of the LHC can also be exploited for dedicated searches for new heavy particles decaying preferentially to top quarks. I will review the latest ATLAS results searching for evidence of new physics in the production and decay of top quarks at the LHC with the ATLAS detector.
- Host: Sridhara Dasu
Thursday, December 14th, 2017
- No events scheduled
Friday, December 15th, 2017
- No events scheduled