pseudorapidity वाक्य
उदाहरण वाक्य
मोबाइल
- In practice, particles with pseudorapidity above a certain threshold cannot be measured since they are too nearly parallel to the beamline and can thus pass through the detector.
- The acceptance of the ALICE Muon Spectrometer covers the pseudorapidity interval 2.5 d " ? d " 4 and the resonances can be detected down to zero transverse momentum.
- The angle between the particle's trajectory and the detector's beam axis ( or more precisely the pseudorapidity ) and its angle within the perpendicular plane are both measured to within roughly 0.025 radians.
- More specialised detectors do not necessarily have a hermetic construction; for example, LHCb covers only the forward ( high-pseudorapidity ) region, because this corresponds to the phase space region of greatest interest to its physics program.
- Often, the rapidity term in this expression is replaced by pseudorapidity, yielding a definition with purely angular quantities : \ Delta R \ equiv \ sqrt { \ left ( \ Delta \ eta \ right ) ^ { 2 } + \ left ( \ Delta \ phi \ right ) ^ { 2 } }, which is Lorentz invariant if the involved particles are massless.
- In hadron collider physics, the rapidity ( or pseudorapidity ) is preferred over the polar angle \ theta because, loosely speaking, particle production is constant as a function of rapidity, and because " differences " in rapidity are partons carry different longitudinal momentum fractions " x ", which means that the rest frames of the parton-parton collisions will have different longitudinal boosts.
- This limit on the pseudorapidity ranges which can be observed forms part of the " acceptance " of the detector ( i . e . the range of phase space which it is able to observe ); broadly speaking, the main design objective of a hermetic detector is to maximise acceptance, i . e . to ensure that the detector is able to measure as large a phase space region as possible.
- The proton lead ( pPb ) collisions in 2013, two years after its heavy-ion collisions opened a new chapter in exploration of the properties of the deconfined, chirally symmetrical state of the QGP . A surprising near-side, long-range ( elongated in pseudorapidity ) correlation, forming a ridge-like structure observed in high-multiplicity pp collisions, was also found in high-multiplicity pPb collisions, but with a much larger amplitude ( ).
- Such detectors are called " seals; the name " 4? detector " comes from the fact that such detectors are designed to cover nearly all of the 4? steradians of solid angle around the interaction point; in terms of the standard coordinate system used in collider physics, this is equivalent to coverage of the entire range of azimuthal angle (-\ pi \ leq \ phi \ leq \ pi ) and pseudorapidity ( | \ eta | \ geq 0 ).
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