Detecting & observing particles

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Presentation transcript:

Detecting & observing particles How does one go from “producing them” to claiming you see them?

Experimenters toolbox - detectors General Purpose Detectors Mainly looking to directly detect high mass particles Key features (GPDs) Hermetic Excellent reconstruction of high energy electrons, muons, photons and “jets” Identify b-quark jets Missing ET Specialized expts (LHCb) Hadron ID (p, K, p) Precision vertexing + …

Jets In high energy (proton) collisions, highly energetic quarks (or gluons) emerge from the collision … Then what? In a very short time (~10-23 sec) after, they get bound up into hadrons (baryons or mesons). The process is called “hadronization” (process of making hadrons) In this way, many qq pairs are created in violent collisions during the hadronization process The resulting “spray” of particles are called “jets”.

Jets pq The spray of particles created is called a JET. The total (p,E) of the jet should reflect the (p,E) of the quark. Buuuuuttttt …. some particles inevitably not accounted for; also usually use calorimeters, which have worse energy resolution, than tracking. Energy resolution ~10-20% typical. Compare to single particles, momentum resolution ~ 0.5% (p = qBR) ! pq Particles are collimated in a cone around the initial quark direction

Event Display – 2 jet event from CMS One small detail: In the interaction, you don’t know what initial pz is. So, the event can be “boosted” in one direction or the other

“Tagging” Jets initiated by a b-quark For jets that are initiated by gluons or light quarks, all the particles in the jet ought to point back to the pp interaction vertex (“Primary Vertex”) BUT, jets initiated by a b-quark will produce a B hadron, which has a “long” lifetime. The B-hadron will travel ~ 1 cm before decaying to several particles. A jet that has 2 or more particles that form a “secondary vertex” is called “tagged” as a b-jet. WHY DO THIS ? H0  bb (produces two b-jets) B-jets play a central role in many searches for New Physics

Missing ET jet e+ ne W+ By momentum/energy conservation: CMS and ATLAS (LHC detectors) cover nearly the full angular range. Only close to the beam pipe do they not have detectors  They see almost all of the energy produced in the collision! jet e+ ne W+ By momentum/energy conservation: Of course, we only see the high energy electron from the W Using what we measure, we have an imbalance of momentum perpendicular to the beam direction. This imbalance is called missing ET. When there is a W in the event, the missing ET is very large, about ½ the W mass (~40 GeV)!

Particle ID (PID) In LHCb, we are looking to reconstruct B hadrons in many specific decay modes. The decays may involve any of the 5 stable particles - p, K, p, m, e. Consider this decay : K- B- K+ p- p+ With Particle ID B- + - Without Particle ID How many different ways can you form the above decay w/ PID? How many different ways can you form the above decay w/o PID? Moreover, how do you know the decay on the right is not: You can see that the level of ambiguity “explodes”, if you don’t have PID. PID critical for LHCb and many other specialized expts.