Review of Particle Physics

Abstract

This biennial Review summarizes much of particle physics. Using data from previous editions, plus 2658 new measurements from 644 papers, we list, evaluate, and average measured properties of gauge bosons, leptons, quarks, mesons, and baryons. We summarize searches for hypothetical particles such as Higgs bosons, heavy neutrinos, and supersymmetric particles. All the particle properties and search limits are listed in Summary Tables. We also give numerous tables, figures, formulae, and reviews of topics such as the Standard Model, particle detectors, probability, and statistics. Among the 112 reviews are many that are new or heavily revised including those on Heavy-Quark and Soft-Collinear Effective Theory, Neutrino Cross Section Measurements, Monte Carlo Event Generators, Lattice QCD, Heavy Quarkonium Spectroscopy, Top Quark, Dark Matter, V-cb & V-ub, Quantum Chromodynamics, High-Energy Collider Parameters, Astrophysical Constants, Cosmological Parameters, and Dark Matter. A booklet is available containing the Summary Tables and abbreviated versions of some of the other sections of this full Review. All tables, listings, and reviews (and errata) are also available on the Particle Data Group website: http://pdg.lbl.gov

Dark matter and lepton flavour violation in a hybrid neutrino mass model

“…JHEP01 (2015) [37][38][39]. We neglect small asymmetries in uncertainties and differences between the HN and IH cases as present in the recent global fits [40,41].…”

“…They can be compared to the experimental limits Br(τ (µ) → eγ) < 3.3 (4.4) × 10 −8 [37] and Br(µ → eγ) < 5.7 × ×10 −13 [42]. Roughly speaking, for TeV scale m φ and λ ∼ 1, the loop-induced transition Br(τ → µγ) is slightly below the current bound, while Br(µ → eγ) violates the current limit for ∆m 41 10 GeV.…”

Indirect Determination of the W Boson Width Based on Inclusive W- and Z-Boson Cross Sections at Tevatron and LHC

“…The total width of the W boson can be either measured directly by kinematic fits on the measured decay lepton spectra, such as the transverse momentum of the charged lepton decay p T or the high-mass tail of the transverse mass m T . A combination of these direct results leads to Γ W = 2085 ± 42 MeV, which is currently dominating the world average [1].…”

Search for Dark Matter Produced in Association with a Higgs Boson Decaying to Two Bottom Quarks at ATLAS

“…−0.0004 [79], which translates to an approximate 95% con dence level (CL) upper limit ρ 0 ≤ 1.0009 (7.6) Combining the expressions in Eq. 7.4, 7.5, and 7.6, the upper limit on g z from the ρ 0 constraint can be expressed as a function of tan β and m Z :…”