Physics 684 - Intro to high energy physics (Spring 2022)

Professor Jahred Adelman

Monday/Wednesday 12:30-1:45, La Tourette 201

Office hours Faraday 219
2-3 pm Monday, 12-1 pm Friday, or by appointment

Course Syllabus

Chapters 1-2

Chapter 3

Chapter 4

Chapter 5

Chapter 6

Chapter 7

Chapter 8

Chapter 9

Chapter 10

Neutrinos and flavor physics


Griffiths 1.19, 2.1, 2.2, 2.5, 2.6, 2.7, 2.8 due Feb 9

Griffiths 3.3, 3.4, 3.6, 3.15, 3.16, 3.17, 3.25. Also: At the HERA collider, 27.5 GeV electrons collided head-on with 920 GeV protons. What was the center of mass energy? (Note that for some of these problems you might want to get familiar with the PDG) Due Feb 16

Griffiths 4.8, 4.10, 4.13, 4.29, 4.30, 4.38. Due Feb 23

Send me a proposed final paper topic no later than Feb 28

Griffiths 6.8, 6.12, 6.14 (use results of problem 6.9, which you don’t have to do, and focus on non-relativistic limit only) + 6.15. Also: if a 1 GeV muon neutrino is fired at a 1 m-thick block of iron-56 with density 7.87x10^3 kg/m3 and the average neutrino-nucleon cross section = 8x10^-39 cm^2, what is the probability that the neutrino interacts in the block? Due March 21

Griffiths 7.6,7.13,7.18,7.48,7.49 (use your answer to 6.8 for part e). Also, send me two additional things: 1) An outline of your presentation (can just be in an email, but it should be a complete outline). Looking for roughly one item per slide, and remember that a good rule of thumb is one slide per minute (remember, it’s a 20 minute presentation) AND 2) At least two references that you are going to use for material and/or background information and/or reading to prepare for your talk, NOT including the ones that are the main paper you are presenting. Also tell me what you are using them for. A good starting point is some references or links from that paper, however you can also use textbooks or other papers. Wikipedia doesn’t count! due March 30

Griffiths 8.17, 8.24.

Also, draw the lowest order QCD diagrams for pp->2 jets. Next, one important question for experimentalists: in what pT range are boosted topologies useful? For example, imagine a very high-pT, boosted W boson decaying to quarks. Show that the jet cone size containing the two quarks from its decay is roughly given by dR (really the cone diameter) roughly 2*mW / pT.
Finally, top quarks are typically pair produced at the LHC. As we will see, the top quarks decay before hadronizing to a W boson and a b quark. The experimental signature thus depends on the subsequent W boson decays. W bosons can decay to a charged lepton-neutrino pair or a quark-antiquark pair. They cannot decay back to a top quark. Using only this knowledge and basic information from QCD (don't calculate matrix elements!), find the leading order branching ratios for ttbar to decay a) to only quarks/anti-quarks (no leptons, called the "all-hadronic" final state) and b) to a final state with an electron and a muon (include anti-electrons and anti-muons in your accounting)
Due April 6

Griffiths 9.5,9.16,9.29,9.30,9.31 (for the last problem, you may want to use the results from problem 9.1, which you do not need to prove). Due April 20

Final presentations (20 minutes + 5 minutes for questions), La Tourette 201

April 27 12:30 pm: Nicholas Yee, An improved upper limit on the neutrino mass from a direct kinematic method by KATRIN SLIDES

April 27 12:55 pm: Andrew Best, Measurement of angular and momentum distributions of charged particles within and around jets in Pb+Pb and pp collisions at sqrt(sNN) = 5.02 TeV with the ATLAS detector SLIDES(PDF) SLIDES(PPT)

April 27 1:20 pm: Abdulrahman Kauther, Analysis of a Tau Neutrino Origin for the Near-Horizon Air Shower Events Observed by the Fourth Flight of the Antarctic Impulsive Transient Antenna (ANITA) SLIDES

May 2 12:30 pm: Joseph Piet, Search for active-sterile antineutrino mixing using neutral-current interactions with the NOvA experiment SLIDES

May 2 12:55 pm: Zamiul Alam, Detection of a particle shower at the Glashow resonance with IceCube SLIDES

May 2 1:20 pm: Tariqul Hasan, Search for Higgs boson decays into a pair of pseudoscalar particles in the bbμμ final state with the ATLAS detector in pp collisions at sqrt(s)=13 TeV SLIDES

May 4 12:30 pm: Kezhen Li, Observation of the doubly charmed baryon decay Ξ++cc→Ξ′+cπ+ SLIDES

May 4 12:55 pm: William Emark, Measurement of the central exclusive production of charged particle pairs in proton-proton collisions at sqrt(s) = 200 GeV with the STAR detector at RHIC SLIDES

May 4 1:20 pm: Samaneh Ahmadinejad, Search for heavy resonances decaying to WW, WZ, or WH boson pairs in the lepton plus merged jet final state at sqrt(s)=13 TeV SLIDES

May 9 12:00 pm: Spencer Kelham, First Measurement of the Λ+c → pη0 decay SLIDES