منابع مشابه
Cardiac responses of grey seals during diving at sea.
Heart rate, swimming speed and diving depth data were collected from free-ranging grey seals, Halichoerus grypus, as they foraged and travelled in the sea around the Hebrides Islands off western Scotland. Information was collected on a tracking yacht using a combination of sonic and radio telemetry. Diving heart rate declined as a function of dive duration. In long dives, grey seals employed ex...
متن کاملStrange Sea Asymmetry in Nucleons
The strange content of the nucleon is under particular attention by the high energy physics society recently. Ji and Tang suggested that if a small locality of strange sea in nucleon is confirmed, some phenomenological consequences can be resulted in. The CCFR data indicate that s(x)/s̄(x) ∼ (1 − x)−0.46±0.87. Assuming an asymmetry between s and s̄, Ji and Tang analyzed the CCFR data and conclude...
متن کاملStrange / anti - strange asymmetry in the nucleon sea
We derive the nucleon sea-quark distributions coming from a meson cloud model, in order to argue for a strange-antistrange asymmetry in the nucleon sea. Motivation According to the Quark Parton Model, with its subsequent improvements coming from Quantum Chromodynamics, it is known that hadrons are built up from a fixed number of valence quarks plus a fluctuating number of gluons and sea quark a...
متن کاملAsymmetry of strange sea in nucleons
Based on the finite-temperature field theory, we evaluate the medium effects in nucleon which can induce an asymmetry between quarks and antiquarks of the strange sea. The short-distance effects determined by the weak interaction can give rise to δm ≡ ∆ms −∆ms where ∆ms(s) is the medium-induced mass of strange quark by a few KeV at most, but the long-distance effects by strong interaction are s...
متن کاملStrange Asymmetries in the Nucleon Sea
Relativistic corrections to the strange axial form factor are evaluated within a light-cone formalism, taking into account effects due to the breaking of Lorentz covariance associated with the use of one-body currents. Similar corrections are known to also be needed for the magnetic form factor, and we discuss the importance of these for recent data on strange electromagnetic form factors from ...
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ژورنال
عنوان ژورنال: Nature
سال: 1870
ISSN: 0028-0836,1476-4687
DOI: 10.1038/002046a0