In particle physics, a pion is any of three subatomic particles:
π0
,
π+
, and
π−
. Each pion consists of a quark and an antiquark and is therefore a meson. Pions are the lightest mesons and, more generally, the lightest hadrons. They are unstable, with the charged pions
π+
and
π−
decaying after a mean lifetime of 26.033 nanoseconds, and the neutral pion
π0
decaying after a much shorter lifetime of 85 attoseconds. Charged pions most often decay into muons and muon neutrinos, while neutral pions generally decay into gamma rays.
Asturias, officially the Principality of Asturias, is an autonomous community in northwest Spain.
The tau, also called the tau lepton, tau particle, tauon or tau electron, is an elementary particle similar to the electron, with negative electric charge and a spin of 1/2. Like the electron, the muon, and the three neutrinos, the tau is a lepton, and like all elementary particles with half-integer spin, the tau has a corresponding antiparticle of opposite charge but equal mass and spin. In the tau's case, this is the "antitau". Tau particles are denoted by the symbol
τ−
and the antitaus by
τ+
.
In physics, a charged particle is a particle with an electric charge. It may be an ion, such as a molecule or atom with a surplus or deficit of electrons relative to protons. It can also be an electron or a proton, or another elementary particle, which are all believed to have the same charge. Another charged particle may be an atomic nucleus devoid of electrons, such as an alpha particle.
In particle physics, a kaon, also called a K meson and denoted
K
, is any of a group of four mesons distinguished by a quantum number called strangeness. In the quark model they are understood to be bound states of a strange quark and an up or down antiquark.
Asturian refers to something related to Asturias, in northern Spain:
Posterior ischemic optic neuropathy (PION) is a medical condition characterized by damage to the retrobulbar portion of the optic nerve due to inadequate blood flow (ischemia) to the optic nerve. Despite the term posterior, this form of damage to the eye's optic nerve due to poor blood flow also includes cases where the cause of inadequate blood flow to the nerve is anterior, as the condition describes a particular mechanism of visual loss as much as the location of damage in the optic nerve. In contrast, anterior ischemic optic neuropathy (AION) is distinguished from PION by the fact that AION occurs spontaneously and on one side in affected individuals with predisposing anatomic or cardiovascular risk factors.
In particle physics, a rho meson is a short-lived hadronic particle that is an isospin triplet whose three states are denoted as
ρ+
,
ρ0
and
ρ−
. Along with pions and omega mesons, the rho meson carries the nuclear force within the atomic nucleus. After the pions and kaons, the rho mesons are the lightest strongly interacting particle, with a mass of 775.45±0.04 MeV for all three states.
The Environment and Planning journals are five academic journals. They are interdisciplinary journals with a spatial focus of primary interest to human geographers and city planners. The journals are also of interest to the scholars of economics, sociology, political science, urban planning, architecture, ecology and cultural studies.
The 2S7 Pion ("peony") or Malka is a Soviet self-propelled 203mm cannon. "2S7" is its GRAU designation. More than 250 units were built; some sources say 500, others up to 1,000. They were distributed around the former Soviet states in the dissolution of the Soviet Union after 1991.
Arroes is one of 41 parishes in Villaviciosa, a municipality within the province and autonomous community of Asturias, in northern Spain.
Candanal is one of 41 parishes in Villaviciosa, a municipality within the province and autonomous community of Asturias, in northern Spain.
Vallés is one of 41 parishes in Villaviciosa, a municipality within the province and autonomous community of Asturias, in northern Spain.
The Asturian Socialist Federation, often shortened to FSA–PSOE, is the regional section of the Spanish Socialist Workers' Party (PSOE) in the Principality of Asturias. It was formed on 27 January 1901 from the Socialist local groupings of Gijón, Oviedo (1892), Mieres and Langreo (1897) and others.
Premio al Pueblo Ejemplar de Asturias is an award granted since 1990 Fundación Princesa de Asturias de Asturias to the Asturian village who stand out in "defense of their noblest values, their natural or ecological environment, their historical, cultural or artistic heritage. This award is conceived within the Princess of Asturias Awards.
The COVID-19 pandemic in Asturias was part of the Spanish outbreak of the worldwide COVID-19 pandemic.
Pion is one of 41 parishes in Villaviciosa, a municipality within the province and autonomous community of Asturias, in northern Spain.
