We study single production of exotic vectorlike Y quark with electric charge |QY|=4/3 and its subsequent decay at the High Luminosity LHC (HL-LHC). Most of the vector like quark (VLQ) decays have the ...electroweak W bosons in the intermediate state. Besides their direct productions singly or pairs, the W-bosons are involved in decay chains as a result of the decay of a top quark which contributes to the background. This is particularly the case since vectorlike Y quark, which is estimated to be produced with a high cross-section, can only decay via a W boson and a down type quark (d,s,b). We calculate the cross sections of signal (for different couplings and mass values) and relevant Standard Model (SM) backgrounds. After a fast simulation of signal and background events, estimations of the sensitivity to the parameters (mass range 1000-2500 GeV for coupling value κY=0.5, and mass range 500-2000 GeV for coupling values κY=0.3 and κY=0.15) have been presented at the HL-LHC with centre of mass energy s=14 TeV and integrated luminosity projections of 300 fb−1, 1000 fb−1 and 3000 fb−1.
In this study, we investigate the process pp→W±γ for the physics potential of the FCC-hh with s=100 TeV to examine the anomalous WWγ couplings defined by three CP-conserving and two CP-violating ...effective operators of dimension-6. The analysis containing the realistic detector effects is carried out in the mode where W± bosons in the final state decay into the leptonic channel. The best sensitivities obtained from the process pp→W±γ on the anomalous couplings CWWW/Λ2 and CW,B/Λ2 determined by CP-conserving effective Lagrangians are −0.010;0.010 TeV−2 and −0.40;0.41 TeV−2, while CW˜WW/Λ2 and CW˜/Λ2 couplings defined by CP-violating effective Lagrangian are obtained as −0.003;0.003 TeV−2 and −0.32;0.33 TeV−2 at the FCC-hh with Lint=30 ab−1. However, if the systematic uncertainty is included, we obtain reduced sensitivities on the anomalous WWγ coupling. The results are compared for assumed systematics of 5% and 10%.
This work offers the constraints on the anomalous neutral triple gauge couplings for the process
e
+
e
-
→
Z
Z
at the CLIC with
s
=
3
TeV. The realistic CLIC detector environments and their effects ...are considered in our analysis. The study is planned for the decays of produced
Z
bosons to a pair of charged leptons (electrons or muons) and neutrino pairs. The bounds on the anomalous neutral triple gauge couplings defining
CP
-violating
C
B
~
W
/
Λ
4
coupling and three
CP
-conserving
C
WW
/
Λ
4
,
C
BW
/
Λ
4
, and
C
BB
/
Λ
4
couplings are obtained. Also, the effects and advantages of polarization for incoming electron beams in these calculations are investigated.
We study the potential of the next ep collider, namely, LHeC, with two options s=1.3 TeV and s=1.98 TeV, to search for excited spin-1/2 and spin-3/2 neutrinos. We calculate the single production ...cross-section of excited spin-1/2 and spin-3/2 neutrinos according to their effective currents describing their interactions between gauge bosons and SM leptons. We choose the ν⋆→eW decay mode of excited neutrinos and W→jj decay mode of W-boson for the analysis. We put some kinematical cuts for the final state detectable particles and plot the invariant mass distributions for signal and the corresponding backgrounds. In order to obtain accessible limits for excited neutrino couplings, we show the f-f′ and ciV-ciA contour plots for excited spin-1/2 and excited spin-3/2 neutrinos, respectively.
In this study, we investigate the potential of
μ
-
μ
+
→
Z
γ
→
ν
ν
¯
γ
process at the future muon collider with a center-of-mass energy of 3 TeV to examine the anomalous ZZ
γ
and
Z
γ
γ
neutral triple ...gauge couplings defining CP-conserving
C
B
~
W
/
Λ
4
coupling and three CP-violating
C
BB
/
Λ
4
,
C
BW
/
Λ
4
,
C
WW
/
Λ
4
couplings. All signal and relevant background events are generated in MadGraph and passed through Pythia for parton showering and hadronization. Detector effects are also considered via tuned muon detector cards in Delphes. The effects of systematic uncertainties of
0
%
,
3
%
and
5
%
on the sensitivities are studied. The best sensitivities obtained from the process
μ
-
μ
+
→
Z
γ
→
ν
ν
¯
γ
are
-
6.53
;
6.64
×
10
-
2
TeV
-
4
on CP-conserving
C
B
~
W
/
Λ
4
coupling and
-
2.47
;
2.47
×
10
-
2
TeV
-
4
,
-
8.46
;
8.46
×
10
-
2
TeV
-
4
and
-
2.20
;
2.20
×
10
-
1
TeV
-
4
on CP-conserving
C
BB
/
Λ
4
,
C
BW
/
Λ
4
,
C
WW
/
Λ
4
couplings , respectively. Our obtained results on the anomalous neutral gauge couplings set more stringent sensitivity, ranging between 5 and 15 times than the current experimental results while slightly better than the phenomenological studies at future pp colliders such as the HL-LHC, the HE-LHC and the FCC-hh, respectively. On the other hand, we can see that the bounds on the anomalous neutral gauge couplings expected to be obtained for the future
e
-
e
+
colliders such as the CLIC are roughly 2 times better than our results.
We study the flavor changing neutral current couplings of new heavy quarks through the Z ′ models at the LHC. We calculate the cross sections for the signal and the corresponding standard model ...background processes. Considering the present limits on the mass of new heavy quarks and the Z ′ boson, we performed an analysis to investigate the parameter space (mixing and mass) through different Z ′ models. For FCNC mixing parameter x = 0.1 and the Z ′ mass M Z ′ = 2000 GeV and new heavy quark mass m t ′ = 700 GeV at the LHC with s = 13 TeV, we find the cross section for single production of new heavy quarks associated with top quarks as 5.8 fb, 3.3 fb, 1.5 fb, and 1.2 fb within the Z η ′ , Z ψ ′ , Z L P ′ , and Z χ ′ models, respectively. It is shown that the sensitivity would benefit from the flavor tagging.
Abstract This work offers the constraints on the anomalous neutral triple gauge couplings for the process $$e^+e^- \rightarrow ZZ $$ e + e - → Z Z at the CLIC with $$\sqrt{s}=3$$ s = 3 TeV. The ...realistic CLIC detector environments and their effects are considered in our analysis. The study is planned for the decays of produced Z bosons to a pair of charged leptons (electrons or muons) and neutrino pairs. The bounds on the anomalous neutral triple gauge couplings defining CP -violating $$C_{\widetilde{B}W}/{\Lambda ^4}$$ C B ~ W / Λ 4 coupling and three CP -conserving $$C_{WW}/{\Lambda ^4}$$ C WW / Λ 4 , $$C_{BW}/{\Lambda ^4}$$ C BW / Λ 4 , and $$C_{BB}/{\Lambda ^4}$$ C BB / Λ 4 couplings are obtained. Also, the effects and advantages of polarization for incoming electron beams in these calculations are investigated.
The purpose of this study was to investigate the effect of moderate strength and endurance training on cognition evaluated by event-related potentials (ERP) in older people. Thirty-six adults, aged ...60-85 years, were randomly divided into three groups: sedentary control (C), strength training (ST), and endurance training (ET). Participants performed functional fitness tests and ERP data were recorded before and after nine weeks of training. Training involved three sessions per week. Functional fitness test performance improved significantly in the ST and ET groups. The latencies of the N1, N2, and P2 components and the amplitudes of the N1P2, P2N2, and N2P3 components differed significantly between groups (p < 0.05). After training, the latencies of the P2 and N2 components at the Fz and Cz sites, decreased significantly, and the amplitudes of the N1P2, P2N2, and N2P3 components at the Fz site and the N1P2 and N2P3 components at the Cz site, increased significantly in the ST group compared with the ET group. After training, the latencies of N1, N2, and P2 components shortened significantly, and the amplitudes of the N1P2, P2N2, and N2P3 components increased significantly in the ST group compared with the C group. The latencies of the N2 and P2 components shortened significantly in the ET group compared with the C group, although the amplitudes of the ERP recordings did not differ significantly between groups. These data suggest that strength training might facilitate early sensory processing and cognitive functioning in older individuals. Key PointsStrength training may have facilitating effects on early information processing and cognition in older people.It is interesting that only small improvements in functional fitness affected cognitive performance.More research is needed to determine how the different exercise regimens contribute to discrete changes in CNS functioning and how such changes affect the P3 component of the ERP.
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