Doubly Heavy Baryon Production in e＋e- Annihilation

Considering the inclusive process, we study the doubly heavy baryon ≡cc （≡bb） production through e＋e- anni- hilation. Both the diquark QQ in color sextet and triplet are discussed. The results show that the contributions from these two color states play equally important roles. At the Z^0 pole, a significant enhancement can be found in the doubly heavy baryon production.     

Doubly Heavy Baryon Production at Polarized Photon Collider

We study the inclusive production of doubly heavy baryon Ξcc at polarized photon collider. Our results show that proper choice of the initial beam polarizations may increase the production rate of Ξcc approximately 10%.     

Search for W' signal in single top quark production at the LHC

Heavy charged gauge bosons are proposed in some theories beyond the standard model. We explore the discovery potential for W →tb with top quark semi-leptonic decay at the LHC. We concentrate on the new physics signal search with the deviation from the standard model prediction if the resonance peak of W cannot be observed directly. Signal events with two jets plus one charged lepton and missing energy are simulated, together with the dominant standard model backgrounds. In this paper, it is found that suitable cuts on the kinematic observables can effectively suppress the standard model backgrounds, so that it is possible to search for a W signal at the LHC if its mass is less than 6.6 Te V.     

The Production of [I]bb at the Photon Collider

The inclusive production of the doubly heavy baryon [I]bb is investigated with a polarized and unpolarized photon collider. The bb pair in both a color triplet and sextet has been considered to transform into [I]bb. The results indicate that the contribution from the color sextet is about 8% for [I]bb production. For the international linear collider collision energy ranging from 91 GeV to 1000 GeV, the total cross section of 3bb shows a downtrend, i.e., the production Of [I]bb has the maximal rate at x/S=91 GeV. Our results indicate that the initial beam polarization may be an important asset for the production of 3bb. At some collision point, the production rate of [I]bb can be increased by about 17% with an appropriate choice of the initial beam polarization.