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1. chinaXiv:201605.01780 [pdf]

Virtual effects of split-SUSY in Higgs productions at linear colliders

Wang, Fei; Wang, Wenyu; Xu, Fuqiang; Yang, Jin Min; Zhang, Huanjun
Subjects: Physics >> The Physics of Elementary Particles and Fields

In split supersymmetry, gauginos and higgsinos are the only supersymmetric particles possibly accessible at foreseeable colliders like the CERN Large Hadron Collider (LHC) and the International Linear Collider (ILC). In order to account for the cosmic dark matter measured by WMAP, these gauginos and higgsinos are stringently constrained and could be explored at the colliders through their direct productions and/or virtual effects in some processes. The clean environment and high luminosity of the ILC render the virtual effects at percent level meaningful in unraveling the new physics effects. In this work we assume split supersymmetry and calculate the virtual effects of the WMAP-allowed gauginos and higgsinos in the Higgs productions e(+) e(-) -> Zh and e(+) e(-) ->nu(e)(nu) over bar (e)h through WW fusion at the ILC. We find that the production cross section of e+ e-. Zh can be altered by a few percent in some part of the WMAP-allowed parameter space, while the correction to the WW fusion process e(+) e(-) ->nu(e) (nu) over bar (e)h is below 1%. Such virtual effects are correlated with the cross sections of chargino pair productions and can offer complementary information in probing split supersymmetry at the colliders.

submitted time 2016-05-15 Hits2361Downloads689 Comment 0

2. chinaXiv:201605.01778 [pdf]

Probing R-parity violating interactions from top-quark polarization at LHC

Li, Peiying; Lu, Gongru; Yang, Jin Min; Zhang, Huanjun
Subjects: Physics >> The Physics of Elementary Particles and Fields

In the minimal supersymmetric standard model the R-parity violating interactions can induce anomalous top pair productions at the LHC through the t-channel process d(R)(R)((d) over bar) -> t(L)(L)((t) over bar) by exchanging a slepton or by the u-channel process d(R)(R)((d) over bar) -> t(R)(R)(<(t)over bar) exchanging a squark. Such top pair productions with a certain chirality cause top-quark polarization in the top pair events. We found that at the LHC, due to the large statistics, the statistical significance of the polarization observable, and thus the probing ability for the corresponding R-parity violating couplings, is much higher than at the Tevatron upgrade.

submitted time 2016-05-15 Hits1161Downloads618 Comment 0

3. chinaXiv:201605.01777 [pdf]

Split two-Higgs-doublet model and neutrino condensation

Wang, F.; Wang, W.; Yang, J. M.
Subjects: Physics >> The Physics of Elementary Particles and Fields

We split the two-Higgs-doublet model by assuming very different vevs for the two doublets: the vev is at weak scale (174 GeV) for the doublet Phi(1) and at neutrino-mass scale (10(-2) - 10(-3) eV) for the doublet Phi(2). Phi(1) is responsible for giving masses to all fermions except neutrinos; while Phi(2) is responsible for giving neutrino masses through its tiny vev without introducing the see-saw mechanism. Among the predicted five physical scalars H, h, A(0) and H-+/-, the CP-even scalar h is as light as 10(-2) - 10(-3) eV while the others are at weak scale. We identify h as the cosmic-dark-energy field and the other CP-even scalar H as the Standard Model Higgs boson; while the CP-odd A(0) and the charged H-+/- are the exotic scalars to be discovered at future colliders. Also we demonstrate a possible dynamical origin for the doublet Phi(2) from neutrino condensation caused by some unknown dynamics.

submitted time 2016-05-15 Hits2139Downloads572 Comment 0

4. chinaXiv:201605.01776 [pdf]

Dark matter constraints on gaugino/Higgsino masses in split supersymmetry and their implications at colliders

Wang, F.; Wang, W.; Yang, J. M.
Subjects: Physics >> The Physics of Elementary Particles and Fields

In split supersymmetry, gauginos and Higgsinos are the only supersymmetric particles that are potentially accessible at soon-to-be-completed colliders. While direct experimental research, such as the LEP and Tevatron experiments, have given robust lower bounds on the masses of these particles, cosmic dark matter can give some upper bounds and thus have important implications for research at future colliders. In this work we scrutinize such dark matter constraints and show the allowed mass range for charginos and neutralinos (the mass eigenstates of gauginos and Higgsinos). We find that the lightest chargino must be lighter than about 1 TeV under the popular assumption M-1 = M-2/2 and about 2 or 3 TeV in other cases. The corresponding production rates of the lightest chargino at the CERN large hadron collider (LHC) and the International Linear Collider (ILC) are also given. While in some parts of the allowed region the chargino pair production rate can be larger than 1 pb at the LHC and 100 fb at the ILC, other parts of the region correspond to very small production rates, and thus there is no guarantee of finding the charginos of split supersymmetry at future colliders.

submitted time 2016-05-15 Hits913Downloads518 Comment 0

5. chinaXiv:201605.01775 [pdf]

Gravitino dark matter from gluino late decay in split supersymmetry

Wang, F; Wang, WY; Yang, JM
Subjects: Physics >> The Physics of Elementary Particles and Fields

In split-supersymmetry (split-SUSY), gluino is a metastable particle and thus can freeze out in the early universe. The late decay of such a long-life gluino into the lightest supersymmetric particle (LSP) may provide much of the cosmic dark-matter content. In this work, assuming the LSP is gravitino produced from the late decay of the metastable gluino, we examine the Wilkinson microwave anisotropy probe (WMAP) dark-matter constraints on the gluino mass. We find that to provide the full abundance of dark matter, the gluino must be heavier than about 14 TeV and thus not accessible at the CERN large hadron collider (LHC).

submitted time 2016-05-15 Hits1022Downloads537 Comment 0

6. chinaXiv:201605.01774 [pdf]

Heavy supersymmetric particle effects in the Higgs boson production associated with a bottom quark pair at the CERN LHC and at the Fermilab Tevatron

Gao, GP; Oakes, RJ; Yang, JM
Subjects: Physics >> The Physics of Elementary Particles and Fields

If all the supersymmetry particles (sparticles) except a light Higgs boson are too heavy to be directly produced at the Large Hadron Collider and Tevatron, a possible way to reveal evidence for supersymmetry is through their virtual effects in other processes. We examine such supersymmetric QCD effects in bottom pair production associated with a light Higgs boson at the Large Hadron Collider and Tevatron. We find that if the relevant sparticles (gluinos and squarks) are well above the TeV scale, too heavy to be directly produced, they can still have sizable virtual effects in this process. For large tan beta, such residual effects can alter the production rate by as much as 40%, which should be observable in future measurements of this process.

submitted time 2016-05-15 Hits988Downloads540 Comment 0

7. chinaXiv:201605.01773 [pdf]

Lightest Higgs boson mass in split supersymmetry with the seesaw mechanism

Cao, JJ; Yang, JM
Subjects: Physics >> The Physics of Elementary Particles and Fields

In the minimal supersymmetric standard model extended by including right-handed neutrinos with seesaw mechanism, the neutrino Yukaka couplings can be as large as the top-quark Yukawa couplings and thus the neutrino/sneutrino may cause sizable effects in Higgs boson self-energy loops. Our explicit one-loop calculations show that the neutrino/sneutrino effects may have an opposite sign to top/stop effects and thus lighten the lightest Higgs boson. If the soft-breaking mass of the right-handed neutrino is very large (at the order of Majorana mass scale), such as in the split-supersymmetry (SUSY) scenario, the effects can lower the lightest Higgs boson mass by a few tens of GeV. So the Higgs mass bound of about 150 GeV in split-SUSY may be lowered significantly if right-handed neutrinos come into play with seesaw mechanism.

submitted time 2016-05-15 Hits988Downloads509 Comment 0

8. chinaXiv:201605.01768 [pdf]

Probing new physics from top-charm associated productions at linear colliders

Cao, JJ; Liu, GL; Yang, JM
Subjects: Physics >> The Physics of Elementary Particles and Fields

The top-charm associated productions via e(+)e(-), e(-)gamma and gamma gamma collisions at linear colliders, which are extremely suppressed in the standard model ( SM), could be significantly enhanced in some extensions of the SM. In this article we calculate the full contribution of the top-color-assisted technicolor ( TC2) to these productions and then compare the results with the existing predictions of the SM, the general two-Higgs-doublet model and the minimal supersymmetric model. We find that the TC2 model predicts much larger production rates than other models and the largest-rate channel is gamma gamma -> t (c) over bar, which exceeds 10 fb for a large part of the parameter space. From the analysis of the observability of such productions at the future linear colliders, we find that the predictions of the TC2 model can reach the observable level for a large part of the parameter space while the predictions of other models are hardly accessible.

submitted time 2016-05-15 Hits821Downloads463 Comment 0

9. chinaXiv:201605.01767 [pdf]

Probing top-color-assisted technicolor from top-charm associated production at the CERN Large Hadron Collider

Cao, JJ; Xiong, ZH; Yang, JM
Subjects: Physics >> The Physics of Elementary Particles and Fields

We propose to probe the top-color-assisted technicolor (TC2) model from the top-charm associated production at the CERN LHC, which is highly suppressed in the standard model. Because of the flavor-changing couplings of the top quark with the scalars (top-pions and top-Higgs-bosons) in the TC2 model, the top-charm associated production can occur via both the s-channel and t-channel parton processes by exchanging a scalar field at the LHC. We examine these processes through Monte Carlo simulation and find that they can reach the observable level at the LHC in quite a large part of the parameter space of the TC2 model.

submitted time 2016-05-15 Hits822Downloads462 Comment 0

10. chinaXiv:201605.01766 [pdf]

Higgs-boson production associated with a bottom quark at hadron colliders with supersymmetric QCD corrections

Cao, JJ; Gao, GP; Oakes, RJ; Yang, JM
Subjects: Physics >> The Physics of Elementary Particles and Fields

The Higgs boson production pp(p (p) over bar)-->bh+X via bg-->bh at hadron colliders, which may be an important channel for testing the bottom quark Yukawa coupling, is subject to large supersymmetric quantum corrections. In this work the one-loop supersymmetric (SUSY) QCD corrections to this process are evaluated and are found to be quite sizable in some parameter space. We also study the behavior of the corrections in the limit of heavy SUSY masses and find the remnant effects of SUSY QCD. These remnant effects, which are left over in the Higgs sector by the heavy sparticles, are found to be so sizable (for a light CP-odd Higgs boson and large tan beta) that they might be observable in future experiments. The exploration of such remnant effects is important for probing SUSY, especially in the case that the sparticles are too heavy (above TeV) to be directly discovered in future experiments.

submitted time 2016-05-15 Hits785Downloads451 Comment 0

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