We study the d̄ ū asymmetry of the proton in a model approach recently developed, in which hadronic fluctuations of the nucleon are generated through gluon splitting and recombination mechanisms. Within this framework, it is shown that both d̄/ū and d̄− ū distributions in the proton can be consistently described by including only nucleon fluctuations to |πN〉 and |π∆〉 bound states. Predictions of t...

A unital $C^*$ -- algebra $mathcal A,$ endowed withthe Lie product $[x,y]=xy- yx$ on $mathcal A,$ is called a Lie$C^*$ -- algebra. Let $mathcal A$ be a Lie $C^*$ -- algebra and$g,h:mathcal A to mathcal A$ be $Bbb C$ -- linear mappings. A$Bbb C$ -- linear mapping $f:mathcal A to mathcal A$ is calleda Lie $(g,h)$ -- double derivation if$f([a,b])=[f(a),b]+[a,f(b)]+[g(a),h(b)]+[h(a),g(b)]$ for all ...

An injective map f : E(G) → {±1, ±2, · · · , ±q} is said to be an edge pair sum labeling of a graph G(p, q) if the induced vertex function f*: V (G) → Z − {0} defined by f*(v) = (Sigma e∈Ev) f (e) is one-one, where Ev denotes the set of edges in G that are incident with a vetex v and f*(V (G)) is either of the form {±k1, ±k2, · · · , ±kp/2} or {±k1, ±k2, · · · , ±k(p−1)/2} U {k(p+1)/2} accordin...

In recent years, knapsack problems for (in general non-commutative) groups have attracted attention. In this paper, the knapsack problem for wreath products is studied. It turns out that decidability of knapsack is not preserved under wreath product. On the other hand, the class of knapsack-semilinear groups, where solutions sets of knapsack equations are effectively semilinear, is closed under...

The adaptive cross approximation method generates low-rank approximations to suitablem×n sub-blocks of discrete integral formulations of elliptic boundary value problems. A characteristic property is that the approximation, which requires k(m+n), k ∼ | log ε|∗, units of storage, is generated in an adaptive and purely algebraic manner using only few of the matrix entries. In this article we pres...

QCD analysis of the CCFR data for xF 3 and Higher–Twist Contribution. Abstract The QCD analysis of the xF 3 structure function measured in deep-inelastic scattering of neutrinos and antineutrinos on an iron target at the Fermilab Tevatron is done in 1–, 2– and 3–loop order of QCD. The x dependence of the higher–twist contribution is evaluated. The experimental value of higher–twist corrections ...

We consider the asymptotic behavior of regression estimators that minimize the residual sum of squares plus a penalty proportional to ∑ βj γ for some γ > 0. These estimators include the Lasso as a special case when γ = 1. Under appropriate conditions, we show that the limiting distributions can have positive probability mass at 0 when the true value of the parameter is 0. We also consider asymp...

A. Courtoy, S. Scopetta, V. Vento 1 Departament de Fisica Teòrica, Universitat de València, and Institut de Fisica Corpuscular, Consejo Superior de Investigaciones Cient́ıficas, 46100 Burjassot (València), Spain 2 Dipartimento di Fisica, Università degli Studi di Perugia, and INFN sezione di Perugia, via A. Pascoli 06100 Perugia, Italy Abstract It is shown that, at variance with previous analyse...

We present the latest Next-to-Next-Leading order strong coupling constant, αs, extracted from Gross-Llewellyn-Smith sum rule. The value of αs from this measurement, at the mass of Z boson, is α s (M 2 Z) = 0.114 +0.009 −0.012. We discuss the previous strange sea quark measurement from the CCFR experiment and the prospects for improvements of the measurement in the NuTeV experiment.

A subset family structure is a topological structure. LetM be a subset family structure and let A be a subset ofM . We introduce A is independent as a synonym of A is open. We introduce A is dependent as an antonym of A is open. Let M be a subset family structure. The family of M yielding a family of subsets of M is defined as follows: (Def. 1) The family of M = the topology of M . Let M be a s...