We perform a model independent analysis of the helicity amplitudes at high energy for all the 2 → 2 scattering processes involving gauge and Higgs bosons in the presence of anomalous W W V , W W V V , V V H, V V HH (V ≡ Z, γ and W ± ), HHHH and HHH interactions. We obtain the perturbative unitarity constraints on anomalous couplings by demanding the vanishing of terms proportional to s 2 and s 3/2 in the helicity amplitudes. Using these constraints, we also compute the upper bound on all the anomalous couplings from terms linear in s.Further, assuming all anomalous couplings to have arisen only from dimension six operators, we show that the perturbative unitarity violation can be evaded up to ∼ 9 TeV corresponding to the best fit values of fW W /Λ 2 and fBB/Λ 2 from the combined analysis of Tevatron and LHC data.

We study and analyze the recent observations of the top pair production ðp " p ! t " tÞ at the Tevatron through flavor conserving and flavor violating channels via vector and tensor unparticles. The unparticle sector is considered with the possibility of being a color singlet or octet. The modified unparticle propagator is used to investigate the contribution of these unparticles to the observed A t" t FB (forwardbackward asymmetry in top pair production) and the spin correlation at the Tevatron. We have also studied the impact of the flavor violating couplings of unparticles to the third generation quarks on (a) pair production of same sign tops/antitops ðp " p ! tt þ " t " tÞ at the Tevatron and (b) the partial top decay width for À U ðt ! uU V Þ. We find that a large region of parameter space is consistent with the measurements of the t " t production cross section, A t" t FB , and spin correlation coefficient at the Tevatron, and we observe that the top decay width measurement constrains the flavor violating coupling of vector unparticles more severely than the same sign top/antitop production at the Tevatron. We also predict the best point set in the model parameter space for specific choices of d U corresponding to 2 min , evaluated using the m t" t spectrum of A t" t FB from the data set of Run II of the Tevatron at the integrated luminosity 8:7 fb À1 . Our results and analysis are consistent even with unparticle theories that have broken scale invariance, as long as the infrared cutoff scale is much less than the top pair production threshold.

This is a summary of the activities of the Physics at the LHC working group in the XIth Workshop on High Energy Physics Phenomenology (WHEPP-XI) held at the Physical Research 707 D K Ghosh, A Nyffeler and V RavindranLaboratory, Ahmedabad, India in January 2010. We discuss the activities of each sub-working group on physics issues at colliders such as Tevatron and Large Hadron Collider (LHC). The main issues discussed involve (1) results on W mass measurement and associated QCD uncertainties, (2) an attempt to understand the asymmetry measured at Tevatron in the top quark production, and (3) phenomenology of warped space dimension model.