Basic kinematics in hadron hadron collisions
The rapidity $y$ and pseudo-rapidity $\eta$ are defined as:
where the $z$ direction is that of the colliding beams.
1.
Verify that for a particle of mass $m$ :
2.
Prove that $\tanh \eta=\cos \theta$.
3.
Consider a set of particles produced uniformly in longitudinal phase space
Find the distribution in $\eta$.
4.
Prove that rapidity equals pseudo-rapidity, $\eta=y$ for a relativistic particle $E\gg m$.
5.
Prove that for Lorentz transformation (boost) in the beam ($z$) directions, the rapidity $y$ of every particle is shifted by a constant $y_0$, related to the boost velocity. Find the relation between $\beta$ and $y_0$ for a generic boost:
6.
Consider a generic particle $X$ of mass $M$ (such as a Z boson or a Higgs) produced on shell at the LHC , with zero transverse momentum, $pp \to X$. Find the relevant values of $x_1,x_2$ of the initial partons that can be accessed by producing such a particle. Compare your results with that of Fig.1, considering the scale $Q=M$.
Fig.1
Attachments (19)
- latex2f6c2e89359f000a84eab566f549d609.png (1.6 KB ) - added by 13 years ago.
- latex482f7fb1f7c1a14672381688324c75b7.png (532 bytes ) - added by 13 years ago.
- latex038bb38a716a6fd0338a96d20a4ec6b0.png (223 bytes ) - added by 13 years ago.
- latex1e549f3e3da0c01ecac16600003fc731.png (240 bytes ) - added by 13 years ago.
- latex0e1e4d95e35d9fb8a2565dcc706268c2.png (240 bytes ) - added by 13 years ago.
- latexe7b2a30a6aececf7903f92ab92c692b8.png (345 bytes ) - added by 13 years ago.
- latex62a570fcb09d03a0a6df2b8c69eb5a17.png (363 bytes ) - added by 13 years ago.
- latexabaacdcdb1801f6bf1dc6927a8fb60f7.png (364 bytes ) - added by 13 years ago.
- latex3d8a797ebf61eaa2c360bb0fe1a3d697.png (530 bytes ) - added by 13 years ago.
- latex6120ec0741202db0decf7819e49b527a.png (205 bytes ) - added by 13 years ago.
- latexec254d5d4b5a8bc52cf0f589b299e4f7.png (218 bytes ) - added by 13 years ago.
- latex110031a8aaf66fd6a868f1c3cc4ff90f.png (175 bytes ) - added by 13 years ago.
- latex770d5d8f98f9cce887efb8c00f891cd3.png (288 bytes ) - added by 13 years ago.
- lhcgridx.png (56.3 KB ) - added by 13 years ago.
- latex4c78a9f669d0c97394bf92e21d8362f8.png (282 bytes ) - added by 13 years ago.
- latex9767ed8aa7b5d8019d464e5437608e01.png (206 bytes ) - added by 13 years ago.
- latex31dfe40b3313de256b7657e744501e57.png (221 bytes ) - added by 13 years ago.
- latex450fa072c38ccc593dd1dedc8b016487.png (1.6 KB ) - added by 13 years ago.
- latex91ec6fa50844fa665e4d071b8757a607.png (1.4 KB ) - added by 13 years ago.
Download all attachments as: .zip