OGRE+Tutorial+Annotation.

Back =CMS Test Beam=

CMS Test Beam e-Lab data
These elements are named by their horizontal and vertical angles from what will become the collision point inside the CMS detector: horizontally the angle is **eta**, and vertically the angle is **phi**.
 * Was obtained for a test of just two detector components, HCAL and ECAL. An HCAL wedge (consisting of a grid of n x m detector elements) sits behind movable ECAL element.
 * Beams of electrons, muons, or pions (a relatively stable meson consisting of quark and an antiquark) of various known energies are aimed at various detector elements.

OGRE
To generate these plots, use the check boxes in OGRE to choose the plot type and select data sets, and choose PLOT at the bottom left of the OGRE home page. Read through the output, pay attention to the numerical values, the units, and interpret the meaning of each plot element (axes, points, slopes, etc.)
 * Particle physicists get the test beam data with a computational analysis package called ROOT. You can get the same information using __Online Graphical ROOT Environment__, that is, OGRE.
 * OGRE enables you to select four kinds of plots from the data (can be selected for 1x1, 3x3 and 5x5 data sets) Each plot answers a question- What is the amount of energy deposited in the detector (ECAL and HCAL combined) by a given set of particles?
 * The answer is revealed in the Total Energy plot for that data set. (You can run a Total Energy plot, or any of the four, for any combination of data runs you choose.)
 * What about the energy deposited in just HCAL? (That's the HCAL Energy plot.)
 * In just ECAL? (The ECAL Energy plot.)
 * How do the energies deposited in each component compare, for each particle in a data set? (That's OGRE's E vs. H plot.)