共查询到20条相似文献,搜索用时 15 毫秒
1.
In the littlest Higgs model with T-parity (LHT) the mirror quarks induce the special flavor structures and some new flavor-changing couplings, which could greatly enhance the production rates of the flavor-changing processes. We in this paper study some bottom and anti-strange production processes in the LHT model at the International Linear Collider (ILC), i.e.,e+e- →b\bar{s} andγγ→b\bar{s}. The results show that the production rates of these processes are sizeable for the favorable values of the parameters. Therefore, it is quite possible to test the LHT model or make some constraints on the relevant parameters of the LHT through the detection of these processes at the ILC. 相似文献
2.
In the littlest Higgs Model with T-parity,we discuss the Higgs production in association with bottom quarks at the LHC and future electron-positron collider.We calculate the cross sections of production channels pp→bb H,bb→H and bg→b H at 14 Te V LHC and the cross sections of production channel e~+e~-→bb H in(un)polarized beams at the lowest order.In order to investigate the observability,we display some typical final state distributions in the Higgs to diphoton channel. 相似文献
3.
Within the context of the Littlest Higgs model with T -parity, the heavy photon (AH) is supposed to be an ideal dark matter (DM) candidate. One direct proof of validity of the model is to produce the heavy photon at collider. In this paper, we investigate the associated production of a photon with heavy photon pair at the planned international e+e- linear collider (ILC),i.e., e+e-→ AHAHγ and show the distributions of the transverse momenta of the photon. The numerical results indicate that the heavy photon production rate could reach several fb at the low mass parameter space and the characteristic signal is a single high energetic photon and missing energy, carried by the heavy photons. All in all, it can be a good chance to observe the heavy photon via this process with the high yearly luminosity of the ILC. 相似文献
4.
Within the context of the Littlest Higgs model with T-parity, the heavy photon (AH) is supposed to be an ideal dark matter (DM) candidate. One direct proof of validity of the model is to produce the heavy photon at collider. In this paper, we investigate the associated production of a photon with heavy photon pair at the planned international e+e- linear collider (ILC), i.e. e+e- → AHAHγ and show the distributions of the transverse momenta of the photon. The numerical results indicate that the heavy photon production rate could reach several fb at the low mass parameter space and the characteristic signal is a single high energetic photon and missing energy, carried by the heavy photons. All in all, it can be a good chance to observe the heavy photon via this process with the high yearly luminosity of the ILC. 相似文献
5.
YUE Chong-Xing LI Ding 《理论物理通讯》2008,50(8):441-444
The littlest Higgs model with T-parity, which is called LHT model, predicts the existence of the new particles, such as heavy top quarks, heavy gauge bosons, and mirror fermions. We calculate the one-loop contributions of these new particles to the top quark ehromomagnetic dipole moment (CMDM) AK. We find that the contribution of the LHT model is one order of magnitude smaller than the standard model prediction value. 相似文献
6.
The littlest Higgs model with T-parity, which is called LHT model,
predicts the existence of the new particles, such as heavy top
quarks, heavy gauge bosons, and mirror fermions. We calculate the
one-loop contributions of these new particles to the top quark
chromomagnetic dipole moment (CMDM)
ΔK. We find that the
contribution of the LHT model is one order of magnitude smaller
than the standard model prediction value. 相似文献
7.
T-odd top partner pair production in the dilepton final states at the LHC in the littlest Higgs Model with T-parity 下载免费PDF全文
In the littlest Higgs model with T-parity, we discuss the pair production of the T-odd top partner(T_) that decays almost 100% into the top quark and the lightest T-odd particle(A_H). Considering the current constraints,we investigate the observability of the T-odd top partner pair production through the process pp→T_T_→tt A_HA_H in the final states with two leptons at 14 TeV LHC. We analyze the signal significance and found that the lower limits on the T-odd top partner mass are approximately 1.2 TeV, 1.3 TeV, and 1.4 TeV at the 2σ confidence level at 14 TeV LHC with an integrated luminosities of 30 fb~(-1), 100 fb~(-1), and 300 fb~(-1), respectively. This lower limit can be increased to approximately 1.5(1.6) TeV if we used 1000(3000) fb~(-1) of the integrated luminosity. 相似文献
8.
The T-parity in the littlest Higgs model can be broken by the anomalous Wess-Zumino-Witten term, which leads that the lightest T-odd gauge boson AH decays into the SM particles. First, we examine some lepton flavor violating decays of AH, namely AH→τ±μ干, AH→τ±e干, and AH→μ±e干. We find that the branching ratios can reach 10-7 for AH→τ±μ干, 10-8 for AH→τ±e干, and 10-8 for AH→μ±e干. Then, we study the lepton flavor violating plus jets signatures of the heavy charged gauge boson and mirror quarks at the LHC, and find that it is possible to be detected for pp→qHqH→τ±μ干+4 jets, and hardly to be detected for pp→qHqH→τ±e干(μ±e干)+4 jets and pp→ WHWH→τ±μ干(τ±e干, μ±e干)+6 jets. 相似文献
9.
LIU Yao-Bei SHEN Jie-Fen CUI Xiao-Min REN Xiao-Yan 《理论物理通讯》2008,49(5):1279-1282
The littlest Higgs (LH) model is the most economical one among various little Higgs models, which predicts the existence of the charged scalars Φ^±. In this paper, we study the production of the charged Higgs boson Φ^- with single top quark via the process gb →tΦ^- at the CERN Large Hadron Collider (LHC). The numerical results show that the production cross section is sma/ler than 0.2 pb in most of the parameters space, it is very difficult to observe the signatures of the charged scalars via the process pp → gb + X → tΦ^- + X at the LHC experiments. However, it can open a window to distinguish the top-pions in the TC2 model or charged Higgs in the MSSM from Φ^±. 相似文献
10.
In the parameter space allowed by the electroweak precision measurement data, we consider the contributions of the new
particles predicted by the littlest Higgs model to the Higgs boson associated production with top quark pair in the future high energy linear
e+e- collider (ILC). We find that the
contributions mainly come from the new gauge bosons ZH and
BH. For reasonable values of the free parameters, the
absolute value of the relative correction parameter
δσ/σSM can be significanly large, which might
be observed in the future ILC experiment with √{S}=800 GeV. 相似文献
11.
In this paper the anomalous magnetic
dipole moment of muon in the
littlest Higgs (LH) model is studied at one-loop level. We discuss the
dependence of the contributions on the global symmetry breaking scale f, mixing angles c and cˊ, and the Higgs triplet vacuum expectation value
vˊ in the electroweak precision data
preferring ranges. We find that the LH model can give a relatively
small, but non-negligible extra weak contribution to the muon
anomalous magnetic moment and can reduce the deviation of
Δaμ from 2.6σ for the SM to 2.5σ for the LH model. 相似文献
12.
13.
In the framework of the littlest Higgs model with T-parity,we study the top pair production at the next generation colliders like LHC and ILC.We find that the order O(αs) corrections to the standard model top pair production cross section at LHC can be very small and the magnitude is below 1%.However,the magnitude of corrections to the standard model top pair production rate at ILC may be over 5% for reasonable values'of the parameters.Besides this,the corrections to the asymmetry ALR(tt) may be more sizable. Therefore,the top pair production at ILC may serve as a probe of the littlest Higgs model with T-parity,especially the asymmetry ALR(tt). 相似文献
14.
In the framework of the littlest Higgs model with T-parity, we study the top pair production at the next generation colliders like LHC and ILC. We find that the order O(αs) corrections to the standard model top pair production cross section at LHC can be very small and the magnitude is below 1%. However, the magnitude of corrections to the standard model top pair production rate at ILC may be over 5% for reasonable values'of the parameters. Besides this, the corrections to the asymmetry ALR(tt) may be more sizable. Therefore, the top pair production at ILC may serve as a probe of the littlest Higgs model with T-parity, especially the asymmetry ALR(tt). 相似文献
15.
Flavor changing effects on the processes t → ch, e+e- → bs, e+e-→ bsh and pp → bs in the LHT model are investigated in this paper. We calculate the one-loop level contributions from the T-parity odd mirror fermions and gauge bosons. The results show that the top quark rare decay t → ch in the LHT model can be significantly enhanced relative to that in the SM. The bs production at linear colliders in the LHT model can enhance the SM cross section a lot and reach 0.1 fb in some parameter space allowed in the experiment. But the heavy gauge boson and mirror fermion loops have small contribution to the processes pp → bs and e+e-→ bsh. So the LHT effect on e+e-→ bs might be detected at future linear colliders, while it is too small to be seen for the e+e-→ bsh and pp → bs processes at future linear colliders and LHC. 相似文献
16.
Based on calculating the contributions of the littlest Higgs model with T-parity (called LHT model) to the anomalous top coupling tqγ (q=u or c), we consider single top production via the t-channel partonic process eq → et in ep collisions. Our numerical results show that the production cross section in the LHT model can be significantly enhanced relative to that in the standard model (SM). 相似文献
17.
Based on calculating the contributions of the littlest Higgs model with T-parity (called LHT model) to the anomalous top coupling tqγ (q = u or c), we consider single top production via the t-channel partonic process eq→et in ep collisions. Our numerical results show that the production cross section in the LHT model can be significantly enhanced relative to that in the standard model (SM). 相似文献
18.
We perform the precision calculations for the e+e-→q_q_(q_q_=u_u_, c_c_, d_d_,s_s_) processes up to the QCD next-to-leading order (NLO) including full weak decays for the final T-odd mirror quarks in the littlest Higgs model with T-parity (LHT) at the Compact Linear Collider (CLIC). We show the dependence of the leading order (LO) and NLO QCD corrected cross sections on the colliding energy √s, and provide the LO and QCD NLO kinematic distributions of final particles. The results show that the LO cross section can be enhanced by the NLO QCD correction and the K-factor increases obviously when the threshold of the on-shell q_q_-pair production approaches the colliding energy √s. The K-factor value varies in the range of 1.04 ~ 1.41 in our chosen parameter space. We find that a simple approximation of multiplying the LO kinematic distribution with the integrated K-factor is not appropriate for precision study of the e+e-→q_q_(q_q_=u_u_, c_c_, d_d_,s_s_) processes, since the NLO QCD corrections are phase space dependent. It is necessary to calculate the differential cross sections including full NLO QCD corrections to get reliable results. 相似文献
19.
We consider the τ leptonic decay $\tau\rightarrow
l\bar{\nu}_{l}\nu_{\tau}$ in the framework of the littlest
Higgs (LH) model and calculate the corrections of new particles to
this decay. We find that the contributions of the charged scalars
can be safely ignored and the LH model is in perfect agreement
with the universality of the couplings of the SU gauge bosons
to the leptonic charged currents. The corrections of the LH model
to the τ leptonic decay $\tau\rightarrow
l\bar{\nu}_{l}\nu_{\tau}$ are not sensitive to the parameter
c, but depend strongly on the parameters f and x. The
precision measured data about the τ leptonic decay demand
that the parameter f approximately equal 3.5 TeV and x>0.1, while agree with the general expectation based on other
phenomenological
explorations. 相似文献