Amplitude Analysis in Hadron Spectroscopy
Refreshments will be served at 1:15 PM
The comprehensive understanding of the strong interaction in the hadronic energy range is one of the open problems in particle and nuclear physics. Problems such as how quarks and gluons aggregate to constitute hadrons, hadrons spectroscopy, the role of chiral symmetry breaking, and confinement have triggered a huge experimental and theoretical effort which is exemplified by the amount of resources poured into this field in the form of experimental facilities (i.e. Jefferson Lab, COMPASS@CERN, LHCb@CERN, PANDA@FAIR, MAMI@Mainz) starting an exciting period in hadron spectroscopy. Besides, Electron-positron collider experiments BaBar and Belle have produced unexpected surprises in the heavy flavor sector, while data on hadron targets of unprecedented statistics have been taken in experiments at CERN by COMPASS and LHCb allowing a search for smaller signals for long sought light and heavy resonances. The analysis of these data requires theoretical input in the form of amplitudes that describe the reactions and allow to extract said resonances (which show up as poles in unphysical Riemann sheets). In this colloquium I will show some of the techniques employed in amplitude analysis and examples on the ongoing program at the Joint Jefferson Lab/Indiana University Physics Analysis Center to provide such amplitudes to the experimental collaborations.
Dr. César Fernández-Ramírez is a postdoctoral researcher at the Center for Theoretical and Computational Physics at Thomas Jefferson National Accelerator Facility (Jefferson Lab, Newport News, Virginia). He received his Ph. D. in Physics at Universidad Complutense de Madrid (Spain) in 2006 and has been postdoctoral researcher at Massachusetts Institute of Technology (Cambridge MA), European Centre for Theoretical Studies in Nuclear Physics and Related Areas (ECT*, Trento, Italy) and Universidad Complutense de Madrid (Spain). He is a member of the Joint Jefferson Lab/Indiana University Physics Analysis Center devoted to provide amplitude analysis for experimental collaborations in nuclear and particle physics at facilities such as Jefferson Lab (USA), MAMI (Mainz, Germany), PANDA (Darmstadt, Germany), LHCb (CERN, Switzerland) and COMPASS (CERN, Switzerland).