17,148 research outputs found
Muon g-2 Anomaly confronted with the higgs global data in the Left-Right Twin Higgs Models
We will examine the Left-Right Twin Higgs(LRTH) Models as a solution of muon
g-2 anomaly with the background of the Higgs global fit data. In the
calculation, the joint constrains from the theory, the precision electroweak
data, the 125 GeV Higgs data, the leptonic flavor changing decay \mu \to
e\gamma decays, and the constraints m_{\nu_R}>m_T>m_{W_H} are all considered.
And with the small mass of the \phi^0, the direct searches from the channels can impose stringent upper limits on Br(h\to
\phi^0\phi^0) and can reduce the allowed region of m_{\phi^0} and f. It is
concluded that the muon g-2 anomaly can be explained in the region of 200 GeV
\leq M\leq 500 GeV, 700 GeV \leq f\leq 1100 GeV, 13 GeV \leq m_{\phi^0}\leq 55
GeV, 100 GeV \leq m_{\phi^\pm}\leq 900 GeV, and m_{\nu_R}\geq 15 TeV after
imposing all the constraints mentioned above.Comment: 18 pages, 4 figures, some typos modifie
Simultaneous observation of small- and large-energy-transfer electron-electron scattering in three dimensional indium oxide thick films
In three dimensional (3D) disordered metals, the electron-phonon
(\emph{e}-ph) scattering is the sole significant inelastic process. Thus the
theoretical predication concerning the electron-electron (\emph{e}-\emph{e})
scattering rate as a function of temperature in 3D
disordered metal has not been fully tested thus far, though it was proposed 40
years ago [A. Schmid, Z. Phys. \textbf{271}, 251 (1974)]. We report here the
simultaneous observation of small- and large-energy-transfer \emph{e}-\emph{e}
scattering in 3D indium oxide thick films. In temperature region of
\,K, the temperature dependence of resistivities curves of the
films obey Bloch-Gr\"{u}neisen law, indicating the films possess degenerate
semiconductor characteristics in electrical transport property. In the low
temperature regime, as a function of for each film can not
be ascribed to \emph{e}-ph scattering. To quantitatively describe the
temperature behavior of , both the 3D small- and
large-energy-transfer \emph{e}-\emph{e} scattering processes should be
considered (The small- and large-energy-transfer \emph{e}-\emph{e} scattering
rates are proportional to and , respectively). In addition, the
experimental prefactors of and are proportional to
and ( is the Fermi wave number,
is the electron elastic mean free path, and is the Fermi energy),
respectively, which are completely consistent with the theoretical
predications. Our experimental results fully demonstrate the validity of
theoretical predications concerning both small- and large-energy-transfer
\emph{e}-\emph{e} scattering rates.Comment: 5 pages and 4 figure
Elastic parton scattering and non-statistical event-by-event mean-pt fluctuations in Au + Au collisions at RHIC
Non-statistical event-by-event mean-pt fluctuations in Au + Au collisions at
sqrt(s_NN) = 130 and 200 GeV are analyzed in AMPT with string-melting, and the
results are compared with STAR data. The analysis suggests that in-medium
elastic parton scattering may contribute greatly to the mean-p_t fluctuations
in relativistic heavy-ion collisions. Furthermore, it is demonstrated that
non-statistical event-by-event mean-pt fluctuations can be used to probe the
initial partonic dynamics in these collisions. The comparison shows that with
an in-medium elastic parton scattering cross section sigma_p=10 mb, AMPT with
string-melting can well reproduce sqrt(s_NN) = 130 GeV data on the centrality
dependence of non-statistical event-by-event mean-pt fluctuations. The
comparison also shows that the fluctuation data for sqrt(s_NN) = 200 GeV Au +
Au collisions can be well reproduced with sigma_p between 6 and 10 mb.Comment: 6 pages, 3 figure
Spin Correlations in top quark pair production near threshold at the Linear Collider
We investigate the spin correlations in top quark pair production near
threshold at the linear collider. Comparing with the results above
the threshold region, we find that near the threshold region the off-diagonal
basis, the optimized decomposition of the top quark spins above the threshold
region, does not exist, and the beamline basis is the optimal basis, in which
there are the dominant spin components: the up-down (UD) component for scattering and the down-up (DU) component for scattering can
make up more than 50% of the total cross section, respectively.Comment: 12 pages, 3 figures, minor modification
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