ar X iv : h ep - p h / 06 02 10 5 v 1 1 3 Fe b 20 06 Quadrupolar contact terms and Hyperfine Structure

ar X iv : h ep - p h / 06 02 10 5 v 2 6 A pr 2 00 6 Quadrupolar contact terms and Hyperfine Structure

In the interaction of two electric quadrupoles, there is at short range a contact term proportional to the second derivative of a delta function. This contact term contributes to the hyperfine splitting of bound states of two particles with spin one or higher-for example the bound state of Ω − and a nucleus with spin one. The contact hyperfine splitting occurs in states with orbital angular mom...

ar X iv : h ep - p h / 06 02 06 6 v 1 7 Fe b 20 06 X ( 3872 ) in effective field theory

We consider the implications from the possibility that the recently observed state X(3872) is a meson-antimeson molecule. We write an effective Lagrangian consistent with the heavy-quark and chiral symmetries needed to describe X(3872) and study its properties.

ar X iv : h ep - t h / 06 02 18 4 v 1 1 9 Fe b 20 06 Gauge Theories as String Theories ; the First Results

The brief review of the duality between gauge theories and closed strings propagating in the curved space is based on the lectures given at ITEP Winter School-2005.

ar X iv : h ep - p h / 06 02 19 2 v 1 2 1 Fe b 20 06 UT - 06 - 01 Minimal Supergravity , Inflation , and All That

We consider an inflationary model in the hidden-sector broken supergravity with an effectively large cutoff. The inflaton decay into right-handed neutrinos naturally causes the observed baryon asymmetry of the universe with a reheating temperature low enough to avoid the gravitino overproduction. We emphasize that all the phenomenological requirements from cosmology and particle physics are sat...

ar X iv : h ep - p h / 02 06 17 1 v 2 2 4 Ju n 20 02 IPHE 2002 - 009 June 24 , 2002 B 0 – B 0 MIXING