Changes between Version 2 and Version 3 of QandA

Timestamp:

Apr 19, 2012, 9:34:58 AM (12 years ago)

Author:

Martin

Comment:

--

QandA

@@ -16 +16 @@
 of the Standard Model (violated by weak interactions) it should be included. The problem is that one would then expect, from naturalness argument
 to have $\theta$ of order one. Experimental bounds coming mainly from the limits on the neutron electric dipole moment gives 
-%$||\theta||<10^{-10}$. This gives the so-called "strong CP problem". The Peccei-Quinn mechanism ([http://prola.aps.org/abstract/PRL/v38/i25/p1440_1 Phys.Rev.Lett. 38 (1977), 1440]) is a famous attempt to solve this problem by introducing a dynamical field, which gives rise to the axion. See the PDG section on [http://pdg.lbl.gov/2008/reviews/axion_s029.pdf axion searches] for  an up-to-date report on axion searches.
+$||\theta||<10^{-10}$. This gives the so-called "strong CP problem". The Peccei-Quinn mechanism ([http://prola.aps.org/abstract/PRL/v38/i25/p1440_1 Phys.Rev.Lett. 38 (1977), 1440]) is a famous attempt to solve this problem by introducing a dynamical field, which gives rise to the axion. See the PDG section on [http://pdg.lbl.gov/2008/reviews/axion_s029.pdf axion searches] for  an up-to-date report on axion searches.
 
 ====== The parton distribution functions are non-perturbative quantities. Is there any solid lattice result?  ======
@@ -33 +33 @@
 
 There are several : the properties (energy and angular distributions) of the muon decay 
-%$\mu^- \to e^- \bar \nu_e \nu_\mu$, Beta decay, and pion decays $\pi^- \to l^- \bar \nu_l$. 
+$\mu^- \to e^- \bar \nu_e \nu_\mu$, Beta decay, and pion decays $\pi^- \to l^- \bar \nu_l$. 
 A concise list and discussion can be found, for instance, in the older version of the lectures on the SM by A. Pich ([http://www.slac.stanford.edu/spires/find/hep/www?eprint=hep-ph/9412274 hep-ph/9412274]).