arXiv subjects

T. De

Publications and source records attributed to T. De.

3 recordsLinked to original sources

arXiv1995

Effective Theory Approach to SUSY Hadron Spectroscopy

Supersymmetric hadrons of the type $\tg\tg$, $\tg g$ and $\tg q\bar q$ could exist depending on the masses of the gluino and the squarks being in an appropriate range of values. We find the energy levels of $\tg g$ and $\tg q\bar q$ bound states (where $q$ denotes a light quark, $u$, $d$ or $s$), as well as the strong interaction transition rates among them, using a Heavy Gluino Effective Theory, much in the same spirit as the well-known Heavy Quark Effective Theory. The results are obtained with greater ease and elegance in comparison to other approaches.

hep-ph↗

arXiv1993

Radiative Corrections to $\zbb$ from Colored Scalars in a Model with Dynamical Symmetry Breaking

Isodoublet color-octet scalar bosons appear in the low-energy limit of a natural extension of the Standard Model in which the electroweak symmetry is broken by a $t\bar t$ condensate. We briefly discuss the model and show that radiative corrections (involving these scalars) to the branching ratio $R_b=Γ(Z\rightarrow b\bar b)/Γ(Z\rightarrow {\rm hadrons})$ are negative and thus place a stringent lower bound on the masses of the colored scalars. This turns out to be $\sim 400$ GeV with $m_t=150$ GeV and increases quadratically with $m_t$. It is emphasized that $R_b$ is a parameter that is well-determined experimentally and that theoretical estimates are relatively free from uncertainties emanating from hadronic corrections and are comparatively insensitive to the value of the top mass.

hep-ph↗

arXiv1993

Advantages in Choosing Real Generators for SU(N)

Some results are presented indicating the distinct advantages that accrue from choosing a real representation for the generators of SU(N) rather than the usual and more popular Gell-Mann type matrices. A few examples in the context of quantum chromodynamics are used to serve as illustrations.

hep-ph↗