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101.
WANG Shao-Ming HAN Liang MA Wen-Gan ZHANG Ren-You JIANG Yi 《理论物理通讯》2007,48(3):491-501
We investigate the lepton flavor violating productions pp/pp→eμ + X in the framework of the R-parity violating (RPV) supersymmetric model at the Tevatron and the CERN large hadron collider (LHC). We present the total cross sections including the next-to-leading order (NLO) QCD corrections and the contribution from gluon-gluon fusion subprocess. Our numerical results show that the one-loop QCD corrections significantly increase the tree-level cross sections, and the variation of K factor is in the range between 1.28 (1.32) and 1.79 (1.58) at the Tevatron (LHC). We find that the QCD correction from the one-loop gluon-gluon fusion subprocess is remarkable at the LHC and should be taken into account. 相似文献
102.
Electron scattering cross sections from DNA/RNA bases are calculated in the 10 eV–10 keV energy range by combining screening-corrected aditivity-rule (SCAR) with ab-initio quasifree inelastic atomic potential. Similar calculations compare very favourably with available experimental data for benzene, C6F6 and tetrahydrofuran molecules. For DNA/RNA bases, where no experimental data is available, present results are compared with other theoretical values. 相似文献
103.
We analyze the forgotten communication of Ettore Majorana (1906–1938?) on the Thomas-Fermi statistical model of the atom,
which he presented on December 29, 1928, during the XXII General Meeting of the Italian Physical Society in Rome, and which
was published in Il Nuovo Cimento, the Society’s journal, in 1929. His communication was not mentioned subsequently in any of the numerous publications of
Enrico Fermi (1901–1954) and his group in Rome, nor in any of the later accounts of Majorana’s life and work. We place Majorana’s
contribution within the context of contemporary research on the subject, point out its influence on the final formulation
of the Thomas-Fermi statistical model by Fermi and Edoardo Amaldi (1908–1989) in 1934, and discuss Majorana’s other scientific
contributions before his mysterious disappearance in 1938.
Francesco Guerra is Professor of Theoretical Physics in the Department of Physics at the University of Rome “La Sapienza.”
His main fields of research are quantum-field theory, statistical mechanics of complex systems, and the history of nuclear
physics. Nadia Robotti is Professor of History of Physics in the Department of Physics at the University of Genoa. Her main
fields of research are the history of atomic physics, quantum mechanics, and nuclear physics. 相似文献
104.
WU Zhongchao & XU Donghui Department of Applied Physics Zhejiang University of Technology Hangzhou China 《中国科学G辑(英文版)》2004,47(3):293-309
It is generally accepted that the Einstein theory of general relativity governs the evolution of the universe. However, the singularity theorem of Hawking and Penrose[1] shows that under the most reasonable physical conditions, a spacetime singularity, where physics laws and even causality are broken down, is unavoidable. One has to impose the boundary or initial conditions at the edge of spacetime for the evolution of the universe. This is the so-called first cause problem. The no-boundary … 相似文献
105.
Using results from conformal field theory, we compute several universal amplitude ratios for the two-dimensional Ising model at criticality on a symmetric torus. These include the correlation-length ratio x
=lim
L
(L)/L and the first four magnetization moment ratios V
2n
=
2n
/
2
n
. As a corollary we get the first four renormalized 2n-point coupling constants for the massless theory on a symmetric torus, G*2n
. We confirm these predictions by a high-precision Monte Carlo simulation. 相似文献
106.
我们发表胡盛志教授的“札记” ,一是想提醒晶体结构工作者们在晶体结构测定过程对空间群的指定应十分小心 ,尽量减少差错 ;同时也想借此透露一些国外同行在纠正空间群测定差错这一方面的工作 ,引起国内同行关注和响应。至于胡教授“札记”的论证方法的客观性 ,论据的充分性等 ,因纯系个人的见解 ,十分欢迎有不同意见者结合实例来稿进行讨论。 相似文献
107.
We clarify and develop the results of a previous paper on the birth of a closed universe of negative spatial curvature and multiply connected topology. In particular we discuss the initial instanton and the second topology change in more detail. This is followed by a short discussion of the results. 相似文献
108.
Yu.D. Glinka A.S. Zyubin A.M. Mebel S.H. Lin L.P. Hwang Y.T. Chen 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2001,16(1):279-283
Photoluminescence (PL) from composites of 7- and 15-nm sized silica nanoparticles (SNs) and mesoporous silicas (MSs) induced
by 266- (4.66-) and 532-nm (2.33-eV) laser light has been studied at room temperature. The multiband PL from MSs in the range
of 1.0-2.1 eV is evidenced to originate from isolated bulk and surface non-bridging oxygens (NBOs) and from NBOs combined
with variously placed 1-nm sized pore wall oxygen vacancies (OVs). The nature and diversity of NBO light-emitters are confirmed
by ab initio calculations. The PL from SNs exhibits only a short wavelength part of the bands (1.5-2.1 eV) originated from isolated bulk
and surface NBOs. This fact indicates that the highly OV-bearing structures occur only in extremely thin (∼ 1 nm) silica layers.
The similarity of spectroscopic properties of silica-based nanoscale materials to those of surface-oxidized silicon nanocrystals
and porous silicon, containing silica-passivating layers of the same width, is discussed.
Received 20 November 2000 相似文献
109.
Meson corrections on the chiral condensate up to next-to-leading order
in a 1/Nc expansion
at finite density are investigated in the NJL model with explicit chiral symmetry breaking. Compared with mean-field results, the chiral phase transition is still of the first order while the properties near the critical density for chiral phase transition are found to change significantly. 相似文献
110.
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