Joint Experimental and Theory Seminar: Kaustubh Agashe (University of Maryland)

Friday, September 8, 2017 at 1:00pm

Physical Sciences Building, 120
245 East Avenue

Using Energy-Peaks to Measure (new and old) Particle Masses


Abstract: I will first analytically show a simple, yet subtle "invariance" of two-body decay kinematics for the case of a massless daughter and a mother particle which is unpolarized and has a *generic* boost distribution in the laboratory frame. Namely, the laboratory frame energy distribution of the massless decay product has a peak, whose location is identical to the  (fixed) energy of that particle in the rest frame of the corresponding mother particle.

In turn, this value of the energy is a simple function of the other masses involved in the decay.  As a proof of principle of the usefulness of this observation, I will then apply it for measuring  the mass of the top quark at the LHC, using simulated data (including experimental  effects). In fact, CMS collaboration (inCMS-PAS-TOP-15-002) has recently implemented our method for measuring the top quark mass! Finally, I will show how it can be used to measure all the superpartner masses in a cascade decay chain of the gluino.

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Contact E-Mail

Contact Name

Ryan McCarty

Contact Phone



Kaustubh Agashe

Speaker Affiliation

University of Maryland


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