Hugonweb | High Energy Experiment

CMSSW Quick Reference

LHE Format Reference

HEPEVT Format Reference

SUSY mSUGRA Reference

1Underlying Event--Not just the interesting stuff in a hadron collider event, but all of it, including the quarks and gluons that undergo "soft" collisions

2Minimum Bias or Inclusive--Events that are not triggered or selected in any way; data with minimum artificial bias

3Rapidity-- $y \rightarrow E=m_T \cos y$, where $m_T^2 = m^2 + P_T^2$

4Pseudorapidity-- $\eta = - \ln [\tan(\theta/2)]$

5Resonances--short lived hadrons that decay by the strong interaction

6 For a Charged Particle in Constant Magnetic field, the Radius of curvature is: $R = \frac{p}{qB}$

In Monte-Carlo Programs, the particle type is standardized to the following "PDG ID" numbers:

Particle PDG ID
d 1
u 2
s 3
c 4
b 5
t 6
e$^-$ 11
$\nu_e$ 12
$\mu^-$ 13
$\nu_\mu$ 14
$\tau^-$ 15
$\nu_\tau$ 16
g 21 (9)
$\gamma$ 22
Z 23
W$^+$ 24
H 25
p 2212
n 2112
$\pi^+$ 211
$\pi^0$ 111
K$^+$ 321

Negative numbers denote the anti-particle where applicable, e.g. $\pi^-$ is -211.

See my little cheat-sheet here created from the 2007 PDG Review

High Energy Physics Statistics (and Jargon)

In high energy physics, when fitting a distribution, a quantity called the "pull" is often investigated. This quantity is called the studentizedresidual in other fields. It is composed of the residual, data - prediction, divided by the error on the prediction. See discussion of similar ratios here

Often, when comparing an observed distribution to a fit a "pull distibution" is investigated. A more general name for this is a test of normality of the residuals see Wikipedia. This is just a distribution of pulls from all data points in a fit. They should be normally distributed.

Some references on the jacknife method:

M. H. Quenouille, "Approximate tests of correlation in time-series", J. Roy. Statist. Soc. Ser. B. 11 (1949) 68--84. http://www.jstor.org/stable/2983696

J. Tukey, "Bias and confidence in not quite large samples", Annals of Mathematical Statistics 29 (1958), no. 614, 1261--1295.

An open access article: http://projecteuclid.org/euclid.aoms/1177698418

Some Papers

LHC Phyics First 1,2 years: http://arXiv.org/abs/hep-ph/0504221v1

Searching For New Physics at Future Accelerators: http://arXiv.org/abs/hep-ph/0410223v2


  1. D. Green, High P~T~ Physics at Hadron Colliders, Cambridge University Press, 2005, p. 60,72 ↩

  2. Ibid, p.73 ↩

  3. Ibid, p. 241 ↩

  4. Ibid, p. 39 ↩

  5. B.R. Martin and G. Shaw, Particle Physics, Third Ed., Wiley and Sons, 2008, p. 66 ↩

  6. PDG Live 2011 ↩