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SUMMARY:Low-energy effective action for pions and a dilatonic meson
DTSTART:20180226T140000
DTSTAMP:20260928T170959Z
UID:86605dfb6aee452fbcd86b0cf39970b0d9436a5acd108b62f09c743e
CATEGORIES:Conferences - Seminars
DESCRIPTION:Maarten Golterman\nNumerical simulatios of QCD-like theories w
 hich are chirally broken but exhibit a very small beta function reveal a 
 flavor-singlet scalar\, or ``dilatonic meson\,'' which is much lighter th
 an any other states except pions. In this talk\, I will describe a system
 atic low-energy expansion for the pions and the dilatonic meson\, in whic
 h the presence of the latter is attributed to an approximate scale symmet
 ry. In order to justify the power counting we invoke the Veneziano limit\
 , in which the number of flavors $N_f$ in the fundamental representation
  grows in proportion with the number of colors $N_c$\, while the ratio $N
 _f/N_c$ is kept close to\, but below\, the critical value where the confo
 rmal window is entered.
LOCATION:BSP 727 https://plan.epfl.ch/?room==BSP%20727
STATUS:CONFIRMED
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