Αποτελέσματα Αναζήτησης
Results are presented from a large-acceptance experiment in which muon-pair production was observed in the mass range 2 to 11 GeV/ c 2. Data were taken with π ±, K +, and p ± beams at 225 GeV/c on carbon, copper, and tungsten targets.
•mass: mµ=0.1056583715(35) GeV . -~200 times heavier than the e . •long lived: τµ~ 2 µs . -10 GeV µ travels on average γvτµ ~62km [can transit the atmosphere] . •participates in weak and electromagnetic interactions . -does not interact strongly with atomic nuclei . -does emit bremsstrahlung in matter . -does ionize traversed matter. 3.
A bstract The Born cross sections of the processes e ⁺ e − → ωπ ⁰ and e ⁺ e − → ωη are measured at center-of-mass energies between 3.773 and 4.701 GeV using a total integrated ...
Muons have a mass of 105.66 MeV/ c2, which is approximately 206.768 2827(46)[6] times that of the electron, me. There is also a third lepton, the tau, approximately 17 times heavier than the muon. Due to their greater mass, muons accelerate slower than electrons in electromagnetic fields, and emit less bremsstrahlung (deceleration radiation).
1 Μαΐ 1997 · Two different approaches are used: in the first one an exclusive selection of events with hard initial state radiation in the energy range 20–88 GeV is directly compared with the Standard Model predictions showing good agreement.
Cross sections for the production of two isolated muons up to high di-muon masses are measured in ep collisions at HERA with the H1 detector in a data sample corresponding √ to an integrated luminosity of 71 pb−1 at a centre of mass energy of s = 319 GeV.
5 Σεπ 2002 · The mass difference of u and d quarks is determined by fitting the data [1]. The contribution of ππ channel to g−2 of muon is calculated in the range of q 2 <1.3 2 GeV 2. In these calculations both space-, time-like regions and τ decays are taken into account.
