Experimental Physics Division (EPD) seminar 
Title: Recent results on the CKM angle gamma with open charm B decays at LHCb 
Speaker: Dr. Vincent Tisserand (Laboratory of Physics of Clermont Ferrand, France) 
Time: 10:00, Wednesday 21st Nov 2018 
Location: B326 main building 
Indico: https://indico.ihep.ac.cn/event/8912/ 

Abstract: 
The precise measurement of the angle gamma of the Cabibbo-Kobayashi-Maskawa (CKM) Unitarity Triangle is a central topic in flavour physics experiments. Its determination at the subdegree level in tree-level open-charm b-hadron decays is theoretically clean and provides a standard candle for measurements sensitive to new physics effects as accessible through global coherence tests of the KM mechanism, with respect to the Standard Model expectations. 
In addition to the results from the B factories (i.e. BaBar and Belle), various recent measurements from the LHCb experiment at CERN allow the angle gamma to be determined with an uncertainty of around 5°. However, no single measurement dominates the world average, as the most accurate measurements have an accuracy of about 10° to 20°. 
We review those recent result and introduce alternative methods that are therefore important to improve the precision. Among them, an analysis of the decay B？？ to D？？？*？φ has the potential to make a significant impact. 

About the speaker: 
Dr. Vincent Tisserand is an expert on flavour physics, member of BaBar, LHCb experiments and CKMfitter group. He lead the LHCb group in CNRS Annecy Laboratory of Particle Physics (LAPP) from 2012 to 2017 before moving to LPC. A detailed CV of Dr. Tisserand can be found at https://indico.ihep.ac.cn/event/8912/material/0/0.pdf