共查询到20条相似文献,搜索用时 22 毫秒
1.
和世平 《中国物理C(英文版)》2023,(7):4-14
Leptoquark(LQ) models are well motivated solutions to the(g-2)μ anomaly. In the minimal LQ models, only specific representations can lead to chiral enhancements. For the scalar LQs, R2 and S1 can lead to the top quark chiral enhancement. For the vector LQs, V2 and U1 can lead to the bottom quark chiral enhancement. When we consider the LQ and vector-like quark(VLQ) simultaneously, there can be more scenarios. In our previous study,we conside... 相似文献
2.
A multi-charged particle model with local U(1)μ-τ to explain muon g–2, flavor physics,and possible collider signature 下载免费PDF全文
We consider a model with multi-charged particles, including vector-like fermions, and a charged scalar under a local \begin{document}$ U(1)_{\mu - \tau} $\end{document} ![]()
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symmetry. We search for an allowed parameter region explaining muon anomalous magnetic moment (muon \begin{document}$ g-2 $\end{document} ![]()
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) and \begin{document}$ b \to s \ell^+ \ell^- $\end{document} ![]()
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anomalies, satisfying constraints from the lepton flavor violations, Z boson decays, meson anti-meson mixing, and collider experiments. Via numerical analysis, we explore the typical size of the muon \begin{document}$ g-2 $\end{document} ![]()
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and Wilson coefficients to explain the \begin{document}$ b \to s \ell^+ \ell^- $\end{document} ![]()
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anomalies in our model when all other experimental constraints are satisfied. Subsequently, we discuss the collider physics of the multicharged vectorlike fermions, considering a number of benchmark points in the allowed parameter space. 相似文献
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Anisotropic strange quark star in Finch-Skea geometry and its maximum mass for non-zero strange quark mass (ms ≠ 0) 下载免费PDF全文
A class of relativistic astrophysical compact objects is analyzed in the modified Finch-Skea geometry described by the MIT bag model equation of state of interior matter, \begin{document}$ p=\dfrac{1}{3}\left(\rho-4B\right) $\end{document} ![]()
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, where B is known as the bag constant. B plays an important role in determining the physical features and structure of strange stars. We consider the finite mass of the strange quark (\begin{document}$ m_{s} \neq 0 $\end{document} ![]()
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) and study its effects on the stability of quark matter inside a star. We note that the inclusion of strange quark mass affects the gross properties of the stellar configuration, such as maximum mass, surface red-shift, and the radius of strange quark stars. To apply our model physically, we consider three compact objects, namely, (i) VELA X-1, (ii) 4U 1820-30, and (iii) PSR J 1903+327, which are thought to be strange stars. The range of B is restricted from 57.55 to \begin{document}$B_{\rm stable}$\end{document} ![]()
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(\begin{document}$\rm MeV/fm^{3}$\end{document} ![]()
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), for which strange matter might be stable relative to iron (\begin{document}$^{56}{\rm Fe}$\end{document} ![]()
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). However, we also observe that metastable and unstable strange matter depend on B and \begin{document}$ m_{s} $\end{document} ![]()
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. All energy conditions hold well in this approach. Stability in terms of the Lagrangian perturbation of radial pressure is studied in this paper. 相似文献
5.
Tian-Peng Tang Murat Abdughani Lei Feng Yue-Lin Sming Tsai Jian Wu Yi-Zhong Fan 《中国科学:物理学 力学 天文学(英文版)》2023,(3):173-181
Two experiments from the Fermilab, E989 and CDF II, have reported two anomalies for muon g-2 and W-boson mass that may indicate the new physics at the low energy scale. Here we examine the possibility of a common origin of these two anomalies in the Next-to-Minimal Supersymmetric Standard Model. Considering various experimental and astrophysical constraints such as the Higgs mass, collider data, flavor physics, dark matter relic density, and direct detection experiments, we find that lighter ele... 相似文献
6.
Because both W-mass and muon g-2 can be affected by mass splittings among extra Higgs bosons(H,A,H~±) in a two-Higgs-doublet model,we take a model with u-r lepton flavor violation interactions to examine the two anomalies reported by CDF Ⅱ and FNAL.We obtain the following observations:(ⅰ) Combined with theoretical constraints,the CDF W-mass measurement disfavors H or A degenerating in mass with H~± but allows H and A to degenerate.The mass splitting between H~± and H/A must be larger than 10 GeV... 相似文献
7.
Motivated by recent supersymmetry (SUSY) search results, which prefer most SUSY particles to be heavy, and the muon g–2 anomaly, which prefers colorless SUSY particles to be light, we explore the status of a light smuon (the SUSY partner of a left-handed muon lepton) in the next-to-minimal supersymmetric standard model (NMSSM). Assuming colored SUSY particles to be heavy, and considering numerous experimental constraints, including muon g-2, SUSY searches, and dark matter, we scan the parameter space in the NMSSM with \begin{document}$ \mathbb{Z}_3 $\end{document} ![]()
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-symmetry and check the status of colorless SUSY particles and their possible mass order, paying special attention to the smuon. After calculations and discussions, we find that the surviving samples can be divided into several scenarios, where the mass region and decay information of the smuon are given. Overall, the smuon mass can be approximately 0.1~1.8 TeV. These results may be useful for smuon searches at the LHC and future colliders. 相似文献
8.
M. Kobel D. Antreasyan H. W. Bartels D. Besset Ch. Bieler J. K. Bienlein A. Bizetti E. D. Bloom I. Brock K. Brockmüller et al. 《Zeitschrift fur Physik C Particles and Fields》1992,53(2):193-205
Using the Crystal Ball detector at thee
+
e
– storage ring DORIS II, we have measured the branching fraction to muon pairsB
of the (1S) and (2S) resonances and for the first time the product of the muonic partial width
and the branching fraction to electronsB
ee
for both resonances. We obtain
相似文献
9.
Quantum geometric tensor and the topological characterization of the extended Su–Schrieffer–Heeger model 下载免费PDF全文
We investigate the quantum metric and topological Euler number in a cyclically modulated Su–Schrieffer–Heeger(SSH) model with long-range hopping terms. By computing the quantum geometry tensor, we derive exact expressions for the quantum metric and Berry curvature of the energy band electrons, and we obtain the phase diagram of the model marked by the first Chern number. Furthermore, we also obtain the topological Euler number of the energy band based on the Gauss–Bonnet theorem on the topologic... 相似文献
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M. E. S. Alves O. D. Miranda J. C. N. de Araujo 《General Relativity and Gravitation》2008,40(4):765-774
In this work we give special attention to the bimetric theory of gravitation with massive gravitons proposed by Visser in
1998. In his theory, a prior background metric is necessary to take in account the massive term. Although in the great part
of the astrophysical studies the Minkowski metric is the best choice to the background metric, it is not possible to consider
this metric in cosmology. In order to keep the Minkowski metric as background in this case, we suggest an interpretation of
the energy–momentum conservation in Visser’s theory, which is in accordance with the equivalence principle and recovers naturally
the special relativity in the absence of gravitational sources. Although we do not present a general proof of our hypothesis
we show its validity in the simple case of a plane and dust-dominated universe, in which the “massive term” appears like an
extra contribution for the energy density. 相似文献
12.
It is shown that the molecular field theory by P. Weiss formally leads to the switching kinetics of ferroelectrics, which is described by the well-known Landau–Khalatnikov equation. The switching has a critical character, taking place only at Ea>Ec (Ea: external field, Ec: coercive field). The results are checked by computer simulations. 相似文献
13.
We present a set of formulas using the solution of the QCD Dokshitzer-Gribov-Lipatov-Altarelli-Parisi (DGLAP) evolution equation
to extract of the exponents of the gluon distribution, λ
g
, and structure function, λ
S
, from the Regge-like behavior at low x. The exponents are found to be independent of x and to increase linearly with lnQ
2 and are compared with the most data from the H1 Collaboration. We also calculated the structure function F
2(x,Q
2) and the gluon distribution G(x,Q
2) at low x assuming the Regge-like behavior of the gluon distribution function at this limit and compared them with an NLO-QCD fit to
theH1 data, two-Pomeron fit, multipole Pomeron exchange fit, and MRST (A.D. Martin, R.G. Roberts, W.J. Stirling, and R.S.
Thorne), DL (A. Donnachie and P.V. Landshoff), and NLO GRV (M. Glük, E. Reya, and A. Vogt) fit results.
The text was submitted by the authors in English. 相似文献
14.
Maximum mass of anisotropic charged strange quark stars in a higher dimensional approach (D ≥ 4) 下载免费PDF全文
In this article, a new class of solutions of Einstein-Maxwell field equations of relativistic strange quark stars obtained in dimensions
15.
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Valence band structure and density of states effective mass model of biaxial tensile strained silicon based on k·p theory 下载免费PDF全文
After constructing a stress and strain model, the valence bands of in-plane biaxial tensile strained Si is calculated by k·p method. In the paper we calculate the accurate anisotropy valance bands and the splitting energy between light and heavy hole bands. The results show that the valance bands are highly distorted, and the anisotropy is more obvious. To obtain the density of states (DOS) effective mass, which is a very important parameter for device modeling, a DOS effective mass model of biaxial tensile strained Si is constructed based on the valance band calculation. This model can be directly used in the device model of metal-oxide semiconductor field effect transistor (MOSFET). It also a provides valuable reference for biaxial tensile strained silicon MOSFET design. 相似文献
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A. E. Dorokhov A. E. Radzhabov F. A. Shamakhov A. S. Zhevlakov 《Physics of Particles and Nuclei》2016,47(3):370-386
In the first part of the review we discuss the effective nonlocal approach in the quantum field theory. It concerns primary the historical retrospective of this approach, and than we concentrate on the interaction of matter particles (fermions and bosons) with the (abelian and nonabelian) gauge fields. In the second part of the review we consider the hadronic corrections (vacuum polarization) to the anomalous magnetic moment of the muon g - 2 factor discussed within the SUf(2) nonlocal chiral quark model. This is considered in the leading and, partially, in the next-to-leading orders (the effect of the fermion propagator dressing due to pion field) of expansion in small parameter 1/Nc (Nc is the number of colors in QCD). 相似文献
19.
A. Berard Subir Ghosh Y. Grandati H. Mohrbach Probir Pal 《The European Physical Journal C - Particles and Fields》2011,71(11):1770
In this paper we have considered the dynamics of an anomalous (g≠2) charged relativistic spinning particle in the presence of an external electromagnetic field. A constraint analysis is
done and the complete set of Dirac brackets are provided that generate the canonical Lorentz algebra and dynamics through
Hamiltonian equations of motion. The spin-induced effective curvature of spacetime and its possible connection with Analogue
Gravity models are commented upon. 相似文献
20.
《中国物理C(英文版)》2021,(1):32-46
The minimal U(1)_(B-L) extension of the Standard Model(B-L-SM) offers an explanation for neutrino mass generation via a seesaw mechanism;it also offers two new physics states,namely an extra Higgs boson and a new Z' gauge boson.The emergence of a second Higgs particle as well as a new Z' gauge boson,both linked to the breaking of a local U(1)_(B-L) symmetry,makes the B-L-SM rather constrained by direct searches in Large Hadron Collider(LHC) experiments.We investigate the phenomenological status of the B-L-SM by confronting the new physics predictions with the LHC and electroweak precision data.Taking into account the current bounds from direct LHC searches,we demonstrate that the prediction for the muon(g-2)_μ anomaly in the B-L-SM yields at most a contribution of approximately 8.9 × 10~(-12),which represents a tension of 3.28 standard deviations,with the current1σ uncertainty,by means of a Z' boson if its mass is in the range of 6.3 to 6.5 TeV,within the reach of future LHC runs.This means that the B-L-SM,with heavy yet allowed Z' boson mass range,in practice,does not resolve the tension between the observed anomaly in the muon(g-2)_μ and the theoretical prediction in the Standard Model.Such a heavy Z' boson also implies that the minimal value for the new Higgs mass is of the order of 400 GeV. 相似文献
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