117796054
Comment on Ji-Sheng Chen et al
This paper was withdrawn by arXiv admins because of inappropriate and unverifiable claims of appropriation.
121445421
Study of Topological Structure of Vacuum by Lattice QCD
Overlap fermions and improved 5Li cooling are compared, which exhibits that these two filter methods can produce similar structures. Then the overlap fermions and improved 5Li cooling are combined to calculate the topological charge and identify the structure of the vacuum. The results are consistent with instanton liquid model.
119391728
Quantum Version of Gauge Invariance and Nucleon Internal Structure
The conflict between cononical commutation relation and gauge invariance, which both the momentum and angular momentum of quark and gluon should satisfy, is clarified. The quantum version of gauge invariance is studied. The gauge independence of the matrix elements of quark momentum and angular momentum operators between physical states are proved. We suggest to use the canonical quark momentum and angular momentum distributions to describe the nucleon internal structure in order to establish an internal consistent description of hadron spectroscopy and hadron structure. The same problem for the atomic spectroscopy and structure is discussed.
124731696
The effective gluon propagator in the global color symmetry model
It is shown that the effective gluon propagator in the global color symmetry model can be calculated in the instanton dilute liquid approximation. The calculated effective gluon propagator is consistent with the general command on the qualitative features of the gluon propagator, i.e., (i) the gluon propagator is significantly enhanced at small space-like k(2), and (ii) for k(2) > 1.5 GeV2 the perturbative results are quantitatively reliable.
123819304
QCD INTERACTION IN PION-DEUTERON ELASTIC-SCATTERING
The pion-deuteron elastic scattering matrix element is under consideration in the framework of QCD. The interactions including the perturbative effect and nonperturbative contributions of gluon condensate and quark condensate in the scattering process are discussed. The interaction operators are given.
117634870
Some properties of pi meson in nuclear matter with finite density
In the GCM we study some properties of pi meson as the Goldstone bosons in a nuclear matter with finite density. Using the effective action in a nuclear matter, we calculate the decay constant and pi mass as functions of the chemical potential. The relation between the chemical potential and the density of a nuclear matter is firstly given here. We find that f(pi) and m(pi) monotonously decrease as nuclear matter density increases. The result is consistent with the usual assumption that the chiral symmetry is gradually restored as the density of a nuclear matter increases.
120618992
Eigenvalue Distribution of Large $N$ Random Matrix--- A Direct Diagrammatic Proof to Marchenko-Pastur Law ---
In various theoretical models, large N limit has been a very useful tool, both at a qualitative and a quantitative level [1]. It works as a great approximation, even when the actual dimension of the matrix is not a very large number, such as Nc = 3 in QCD [2, 3] and Nf = 3 in neutrino anarchy [4]. It is thus useful to understand the behavior of large N random matrices as much as possible. In random matrix theory, there is a powerful law— Marchenko-Pastur (MP) law [5]—that governs the asymptotic eigenvalue distribution of large-dimension random matrices. In this paper we provide an alternative proof to it. We first state Marchenko Pastur law in Section II. Then in Section III, we present a detailed proof of MP law using Feynman diagrams. We extend our proof to symmetric matrix case in Section IV. Section V is our conclusion.
53654264
Neutrino mass anarchy and the Universe
A bstractWe study the consequence of the neutrino mass anarchy on cosmology, in particular the total mass of neutrinos and baryon asymmetry through leptogenesis. We require independence of measure in each mass matrix elements in addition to the basis independence, which uniquely picks the Gaussian measure. A simple approximate U(1) flavor symmetry makes leptogenesis highly successful. Correlations between the baryon asymmetry and the light-neutrino quantities are investigated. We also discuss possible implications of recently suggested large total mass of neutrinos by the SDSS/BOSS data.
116450098
What do precision Higgs measurements buy us
We study the sensitivities of future precision Higgs measurements and electroweak observables in probing physics beyond the Standard Model. Using effective field theory--appropriate since precision measurements are indirect probes of new physics--we examine two well-motivated test cases. One is a tree-level example due to a singlet scalar field that enables the first-order electroweak phase transition for baryogenesis. The other is a one-loop example due to scalar top in the MSSM. We find both Higgs and electroweak measurements are sensitive probes of these cases.
118391627
Measurement of hadron composition in charged jets from pp collisions with the ALICE experiment
Abstract We report the first measurement of charged pion, kaon and (anti-)proton production in jets from hadron colliders. The measurement was carried out with the ALICE detector using 2 × 10 8 minimum bias pp collisions at a centre-of-mass energy of s = 7 TeV at the LHC. We present the π, K and p transverse momentum ( p T ) spectra, as well as the spectra of the reduced momentum ( z ch ≡ p T track / p T,jet ch ), in charged jets of p T between 5–20 GeV/c. The measurement is compared to Monte Carlo calculations.
118605527
How to use the Standard Model effective field theory
A bstractWe present a practical three-step procedure of using the Standard Model effective field theory (SM EFT) to connect ultraviolet (UV) models of new physics with weak scale precision observables. With this procedure, one can interpret precision measurements as constraints on a given UV model. We give a detailed explanation for calculating the effective action up to one-loop order in a manifestly gauge covariant fashion. This covariant derivative expansion method dramatically simplifies the process of matching a UV model with the SM EFT, and also makes available a universal formalism that is easy to use for a variety of UV models. A few general aspects of RG running effects and choosing operator bases are discussed. Finally, we provide mapping results between the bosonic sector of the SM EFT and a complete set of precision electroweak and Higgs observables to which present and near future experiments are sensitive. Many results and tools which should prove useful to those wishing to use the SM EFT are detailed in several appendices.