Changes between Version 1 and Version 2 of Octet_tcgg

Timestamp:

Oct 28, 2015, 4:16:34 PM (9 years ago)

Author:

Elizabeth Druekeel

Comment:

--

Octet_tcgg

@@ -1 @@
-bla
+= A Coloron Model =
+
+== Authors ==
+
+* Elizabeth Drueke (Michigan State University)
+* Joseph Nutter (Michigan State University)
+* Reinhard Schwienhorst (Michigan State University)
+* Natascia Vignaroli (Michigan State University)
+* Devin G. E. Walker (SLAC National Accelerator Laboratory)
+* Jiang-Hao Yu (The University of Texas at Austin)
+
+== Description of the Model ==
+
+Colored vector bosons from new strong dynamics, Kaluza-Klein gluons or KKg’s (G*) in a dual 5D picture, have been searched for mainly in the t-tbar channel.  In this model, the third generation quarks couple differently than the light quarks under an extended 
+{{{
+#!latex
+$SU(3)_1 \times SU(3)_2$
+}}}
+color gauge group.  The mixing between light and third generation quarks is induced by the interactions of all three generation quarks with a set of new heavy vector0like quarks.  The model reproduces the CKM mixing and generates flavor-changing neutral currents (FCNCs) from non-standard interactions.  Due to the specific structure of the model, dangerous FCNCs are naturally suppressed and a large portion of the model parameter space is allowed by the data on meson mixing process and on 
+{{{
+#!latex
+$b \to \gamma$.
+}}}
+The extended color symmetry is broken down to 
+{{{
+#!latex
+$SU(3)_C$
+}}}
+by the (diagonal) expectation value,
+{{{
+#!latex
+$\langle \Phi \rangle \propto u \cdot {\cal I}$,
+}}}
+of a scalar field Phi which transforms as a 
+{{{
+#!latex
+$\bf 3, \bar{3}$
+}}}
+under the color gauge structure.  It is assumed that color gauge breaking occurs at a scale much higher than the electroweak scale.
+
+Breaking the color symmetry induces a mixing between the 
+{{{
+#!latex
+$SU(3)_1$ \rm{and} $SU(3)_2$
+}}}
+gauge fields
+{{{
+#!latex
+$A^{1}_{\mu}$ \rm{and} $A^{2}_{\mu}$,
+}}}
+which is diagonalized by a rotation determined by 
+{{{
+#!latex
+$\cot\omega = \frac{g_1}{g_2} \qquad g_s = g_1 \sin\omega = g_2 \cos\omega$,
+}}}
+where g_s is the QCD strong coupling and g_1 and g_2 are the SU(3)_1 and SU(3)_2 gauge couplings, respectively.  The mixing diagonalization reveals two color vector boson mass eigenstates: the mass-less SM gluon and a new massive color-octet vector boson G* given by
+{{{
+#!latex
+$G^{*}_{\mu}=\cos\omega A^{1}_{\mu} - \sin\omega A^{2}_{\mu} \qquad M_{G^{*}} = \frac{g_s u}{\sin\omega \cos\omega}.$
+}}}
+In the NMFV model, the third generation quarks couple differently than the light quarks under the extended color group.  
+{{{
+#!latex
+$g_L=(t_L, b_L),$ \rm{ } $t_R,$ \rm{ and } $b_R,$
+}}}
+as well as a new weak-doublet of vector-like quarks, transform as 
+{{{
+#!latex
+$({\bf 3,1})$
+}}}
+under the color gauge group, while the light generation quarks are charged under SU(3)_2 and transform as
+{{{
+#!latex
+$({\bf 1,3})$
+}}}
+The G* interactions with the color currents associated with SU(3)_1 and SU(3)_2 are given by
+{{{
+#!latex
+$g_s \left(\cot\omega J^{\mu}_1 - \tan\omega J^{\mu}_2 \right)G^{*}_{\mu}.$
+}}}
+
+== Note ==
+
+Need to reread and make sure everything is the same as the paper and that nothing for KKg has been carried over.