Difference between revisions of "Hard"
From Particle Wiki
(Created page with "Category:Basic concept Category:Collider physics Hard is an adjective often used to describe the energy and or momentum of (an object involved in) a scattering proces...") |
m |
||
| (2 intermediate revisions by one other user not shown) | |||
| Line 1: | Line 1: | ||
[[Category:Basic concept]] | [[Category:Basic concept]] | ||
[[Category:Collider physics]] | [[Category:Collider physics]] | ||
| − | |||
Hard is an adjective often used to describe the energy and or momentum of (an object involved in) a scattering process in collider physics. The energy is usually large enough that in calculations of such processes a perturbative expansion in the [[coupling]] strength may be employed. This distinguishes such a process or object from something which is [[soft]], or has low energy and or momentum. | Hard is an adjective often used to describe the energy and or momentum of (an object involved in) a scattering process in collider physics. The energy is usually large enough that in calculations of such processes a perturbative expansion in the [[coupling]] strength may be employed. This distinguishes such a process or object from something which is [[soft]], or has low energy and or momentum. | ||
| − | For example, in a [[general-purpose event generator]] the hard event is usually calculated at [[fixed order]] using a [[matrix-element generator]] and evolved to lower energies using a [[parton shower]]. | + | For example, in a [[general-purpose event generator]] the hard event is usually calculated at [[fixed order]] using a [[matrix-element generator]] and evolved to lower energies (typically the [[hadronisation]] scale <math>\Lambda_{QCD}</math>) using a [[parton shower]]. |
Latest revision as of 15:47, 1 August 2017
Hard is an adjective often used to describe the energy and or momentum of (an object involved in) a scattering process in collider physics. The energy is usually large enough that in calculations of such processes a perturbative expansion in the coupling strength may be employed. This distinguishes such a process or object from something which is soft, or has low energy and or momentum.
For example, in a general-purpose event generator the hard event is usually calculated at fixed order using a matrix-element generator and evolved to lower energies (typically the hadronisation scale 
) using a parton shower.
