Let (φ, ψ) be an (m,n)-valued pair of maps φ, ψ : X ( Y , where φ is an m-valued map and ψ is n-valued, on connected finite polyhedra. A point x ∈ X is a coincidence point of φ and ψ if φ(x) ∩ ψ(x) 6= ∅. We define a Nielsen coincidence number N(φ : ψ) which is a lower bound for the number of coincidence points of all (m,n)-valued pairs of maps homotopic to (φ, ψ). We calculate N(φ : ψ) for all ...

Using J/ψ and open charm photoproduction data, we apply the vector meson dominance model to obtain constraints on the energy dependence of the inelastic J/ψ-nucleon cross section. Predictions of short distance QCD are in accord with these constraints, while recently proposed hadronic models for J/ψ dissociation strongly violate them. The energy dependence of the inelastic J/ψ-nucleon cross sect...

H. Brezis and L. Nirenberg proved that if (gk) ⊂ C(S , S ) and g ∈ C(S , S ) (N ≥ 1) are such that gk → g in BMO(S ), then deg gk → deg g. On the other hand, if g ∈ C(S , S ), then Kronecker’s formula asserts that deg g = 1 |SN | ∫ SN det(∇g) dσ. Consequently, ∫ SN det(∇gk) dσ converges to ∫ SN det(∇g) dσ provided gk → g in BMO(S N ). In the same spirit, we consider the quantity J(g, ψ) := ∫ SN...

It has been argued long ago that ηb could be observed through the ηb → J/ψ(→ μ+μ−)J/ψ(→ μ+μ−) decay chain. Recent calculations indicate that the width of ηb into two J/ψ is almost three order of magnitude smaller than the one into the DD. We study the effects of final state interactions due to the DD intermediate state on the J/ψ J/ψ final state. We find that the inclusion of this contribution ...

There are different approaches for diffractive photoproduction of charmonia. Recently, a new approach is proposed, in which charm quarks are taken as heavy quarks and the nonperturbative effect related to charmonia can be handled with nonrelativistic QCD. The interaction between the cc̄ pair and the initial hadron is through exchange of soft gluons. The exchange of soft gluons can be studied wit...

Let p be an odd prime, where ϑ and m are positive integers. ψ a nonzero element of the finite field Fq, q=pm, R=Fq+uFq+u2Fq(u3=0). In this paper, we determine completely symbol-triple distances all ψ-constacyclic codes length pϑ over R.

The observed features of ψ ′ to J/ψ suppression in pA and nucleus-nucleus collisions can be explained in terms of a two-component absorption model. For the hard component of the absorption due to the interaction of the produced c¯ c systems with baryons at high relative energies, the absorption cross sections are insensitive to the radii of the c¯ c systems, as described by the Additive Quark M...

Using (448.1±2.9)×106 ψ(3686) events collected with the BESIII detector and a single-baryon tagging technique, we present first observation of decays ψ(3686)→Ξ(1530)0Ξ¯(1530)0 Ξ(1530)0Ξ¯0. The branching fractions are measured to be B(ψ(3686)→Ξ(1530)0Ξ¯(1530)0)=(6.77±0.14±0.39)×10−5 B(ψ(3686)→Ξ(1530)0Ξ¯0)=(0.53±0.04±0.03)×10−5. Here, second uncertainties statistical systematic, respectively. In ...

In any graph G = (V,E) that is not necessarily finite, a graphoidal cover is a set ψ of nontrivial paths P1, P2, . . . , not necessarily open and called ψ -edges, such that (GC-1) no vertex of G is an internal vertex of more than one path in ψ, and (GC-2) every edge of G is in exactly one of the paths in ψ. A ψ -dominating set of G is then defined as a set D of vertices in G such that every ver...