[Theory-seminars] Theory Seminar Mar. 12 - John Collins

[Andrea Signori]

Theory Seminar
Monday, March 12
1:00pm - CEBAF Center, Room L102

John Collins (Penn State University): Time to retire a myth in pQCD

Abstract:
In many treatments of factorization in QCD, the logical starting point 
is an unproved assertion that the cross sections in question are the 
convolution product of "bare parton densities" and unsubtracted on-shell 
massless partonic cross sections. This assertion is repeated many times 
in textbooks, lectures, as well as in papers.  I will show why it is 
physically and conceptually false.  I will argue that this myth is 
impeding progress in pQCD, because an incorrect starting point messes up 
efforts to extend the methods.  Moreover, the myth miseducates students.

The link to remotely connect via Blue Jeans is available at 
https://www.jlab.org/div_dept/theory/seminars/2018-spring-theory-seminar.html
Looking forward to seeing you tomorrow,

     Alessandro, Andrea, Bipasha

-- 
Postdoctoral researcher
Theory Center - Jefferson Lab
12000 Jefferson Avenue,
Newport News, VA 23606 USA
CEBAF center, office A211
Tel: +1 (757) 269-6735
https://userweb.jlab.org/~asignori