120830338
THE EFFECT OF TOP QUARK LOOP ON THE NEUTRAL PSEUDO-GOLDSTONE BOSON PRODUCTION FROM Z DECAYS
The main production mechanism of neutral pseudo-Goldstone bosons, as predicted in technicolor models, is via their couplings to gauge bosons. We calculate the effect of top quark loop on the coupling. The result affects the prediction of the neutral pseudo-Goldstone boson production from Z decays.
5505221
The rare top decay t → cg in topcolor assisted technicolor models
In the framework of topcolor-assisted technicolor(TC2) models, we calculate the contributions of flavor changing scalar couplings involved the neutral top-pion � 0 and top-Higgs h 0 to the branching ratio Br(t −→ cg). We find that the value of Br(t −→ cg) can reach 1 × 10 3 with reasonable values of the parameters in TC2 models, which may be testable in the future experiments.
120681113
Production of the lightest neutral technipion at the First Muon Collider
In the framework of the topcolour-assisted multiscale technicolour (TOPCMTC) models, we discuss the s-channel resonance production of the lightest neutral technipion P0 at the First Muon Collider (FMC). Our calculation results show that the effective cross section is very large and at least larger than that of the standard model Higgs boson h0 by one order of magnitude. Thus, the FMC offers an opportunity for detecting the technipions and testing various technicolour models.
118443717
The flavor-changing top-charm associated productions at ILC in littlest Higgs model with T parity
The littlest Higgs model with T-parity (LHT) has new flavor-changing (FC) couplings with the Standard Model (SM) quarks, which do not suffer strong constraints from electroweak precision data. So these FC interactions may enhance the cross sections of some flavor-changing neutral-current (FCNC) processes. In this work, we study the FC top-charm associated productions via $e^{-}\gamma$ collision at the ILC. We find that the cross sections are sensitive to the mirror quark masses. With reasonable values of the parameters, the cross sections may reach the detectable level and provide useful information about the relevant parameters in the LHT model, especially setting an upper limit on the mirror quark masses.
123435703
UNIFIED MODEL OF METACOLOR INTERACTION
Unified composite model in which the metacolor symmetry group and the standard model group are embedded in a single group of the SU(N) type and unified above a certain energy scale are constructed. Such unification scheme provides constraints to the composite model building. The proposed models are analyzed in terms of the complementarity principle to show that they satisfy the physics Higgs phase criterion. In order to obtain a metacolor scale of the order of a few tens TeV, the rank of the unification group is restricted.
204187229
A CONFINING SU(4) X SU(4) COMPOSITE MODEL OF THE WEAK INTERACTIONS. (IN CHINESE)
118530863
Population synthesis for symbiotic X-ray binaries
Symbiotic X-ray binaries (SyXBs) comprise a rare class of low-mass X-ray binaries. We study the Galactic SyXBs, which we consider as detached binaries composed of low-mass giants and wind-fed neutron star (NS) companions, by simulation of the interaction of a magnetized NS with its environment and utilizing a population synthesis code. We focus mainly on the parameters that influence the observational appearance of an SyXB: the donor wind velocity (vw) and the angular momentum distribution in the shell of matter settling on to an NS. We estimate the birthrate of SyXBs as similar to 4.1 x 10-5 to similar to 6.6 x 10-6?yr-1 and their number in the Galaxy as similar to 1001000. The assumed stellar wind velocity from cool giants is the input parameter that influences the model SyXB population most. Among known SyXBs or candidate systems, 4U 1954+31 and IGR J16358-4724 in which the NSs have very long spin periods may host quasi-spherically accreting NSs. GX 1+4 has a peculiar long-term spin behaviour and it may also be a quasi-spherical wind-accreting source. We cannot identify whether there are wind-fed accretion discs in 4U 1700+24, Sct X-1, IRXS J180431.1-273932 and 2XMM J174016.0-290337.