arXiv subjects

Yueling Yang

Publications and source records attributed to Yueling Yang.

57 records · Page 4Linked to original sources

arXiv2002

Associated production of neutral toppion with a pair of heavy quarks in $γγ$ collisions

We have studied a neutral toppion production process $γγ\to f\bar{f}Π_{t}^{0}(f=t,b)$ in the topcolor-assisted technicolor(TC2) model. We find that the cross section of $γγ\to t\bar{t}Π_{t}^{0}$ is much larger than that of $γγ\to b\bar{b}Π_{t}^{0}$. On the other hand, the cross section can be obviously enhanced with the increasing of c.m.energy. With $\sqrt{s}=1600$ GeV, the cross section of $t\bar{t}Π_t^0$ production can reach the level of a few fb. The results show that $γγ\to t\bar{t}Π^0_t \to t\bar{t}(t\bar{c})$ is the most ideal channel to detect neutral toppion due to the clean SM background. With such sufficient signals and clean background, neutral toppion could be detected at TESLA with high c.m.energy.

hep-ph↗

arXiv2002

Production of the neutral toppion at the e gamma colliders

In the framework of topcolor-assisted technicolor(TC2) model, we study a neutral toppion production process $e^{-}γ\to e^{-}Π^{0}_{t}$ in this paper. Our results show that the production cross section of $e^{-}γ\to e^{-}Π^{0}_{t}$ can reach the level of several tens fb, and over $10^{3}$ neutral toppion events can be produced in the planned $e^+e^-$ linear colliders each year. Therefore, such a toppion production process provides us a unique chance to detect toppion events and test the TC2 model. On the other hand, the cross section of $e^{-}γ\to e^{-}Π^{0}_{t}$ is about one order of magnitude larger than those of some similar processes in SM and MSSM(i.e., $e^{-}γ\to e^{-}H$ in SM and $e^{-}γ\to e^{-}H^{0}(A^0,h^0)$ in MSSM). So, we can easily distinguish the neutral toppion from other neutral Higgs bosons in SM and MSSM.

hep-ph↗

arXiv2002

The study of a flavor-changing neutral toppion production process $e^+e^-\to t\bar{c}Π_t^0$

We have studied a flavor-changing toppion production process $e^{+}e^{-}\to t\bar{c}Π^{0}_{t}$ in the topcolor-assisted technicolor(TC2) model. The studies show that, with high centre of mass energy in TESLA collider, the production cross section of $e^{+}e^{-}\to t\bar{c}Π^{0}_{t}$ is at the order of magnitude 0.1 fb in most parameter regions of TC2 model and a few tens events of toppion can be produced each year. The resonance effect can enhance the cross section to a few fb when toppion mass is small. With clean background, the toppion events can possibly be detected at TESLA collider. On the other hand, we find that there exists a narrow peak near $m_t-m_c$ in the toppion-charm invariant mass distribution which could be clearly detected. Therefore, such a toppion production process $e^{+}e^{-}\to t\bar{c}Π^{0}_{t}$ provides a unique chance to detect toppion events and test the TC2 model.

hep-ph↗