Report on Gauge bosons W and Z To

Report on Gauge bosons W and Z To the PDG Collaboration/Advisory Committee Atul Gurtu, Martin Grünewald (Encoders/Overseers) LBNL, 26 -27 October 2018

A Gurtu, M Grünewald: W/Z Report to the PDG Collab/Advisory Committee, LBNL, 26 -27 Oct 2018

Evolution of statistics • Papers read: 1992 94 96 98 2000 02 04 06 08 10 12 14 16 18 ? 80 86 93 98 83 31 49 44 37 23 49 37 55 LHC • Nodes (Particle properties): 1992 94 96 98 2000 02 04 06 08 10 12 14 16 18 Z 47 75 107 128 134 140 145 148 152 154 155 W 14 14 15 28 30 30 33 33 33 34 34 • Pages in RPP 1992 94 96 98 2000 02 04 06 08 10 12 14 16…. Z 7 13 15 18 18 20 21 22 22 23 no publ. W 2 3 3 5 7 7 7 8 9 9 listings A Gurtu, M Grünewald: W/Z Report to the PDG Collab/Advisory Committee, LBNL, 26 -27 Oct 2018

Reminder: Work Methodology of W/Z team • Established as a 2 -member team in end-1992 • Carlo Caso (LEP-DELPHI, ATLAS) + AG (LEP-L 3, CMS) • 2007: Carlo passed away, replaced by Martin Gruenewald (LEP-L 3, D 0, CMS) • • • Both members are Encoders + Overseers Both independently read all the papers in the PDG W/Z list Make independent notes Exchange the notes when all papers are done Finalize the coding to be done. A Gurtu, M Grünewald: W/Z Report to the PDG Collab/Advisory Committee, LBNL, 26 -27 Oct 2018

Data averaging: LEP & Tevatron • To obtain best LEP average measurements, results from the four experiments obtained over several years had to be combined using averaging procedures which accounted for correlated errors. • LEP Electroweak Working Group; LEP W-group. AG & Martin were both members of the LEP EWWG 1992 – • LEP WGs (EW, higgs…) PDG INTERFACE PLAYED A CRUCIAL ROLE OVER THE YEARS. • TEVATRON EWWG played a similar role for RUN-II data on W and Z combining results from two experiments over many years. A Gurtu, M Grünewald: W/Z Report to the PDG Collab/Advisory Committee, LBNL, 26 -27 Oct 2018

LHC experiments • Expectedly, an LHC Electro. Weak Working Group exists and we are on the mailing list • For the Triple and Quartic Gauge Couplings LEP, Tevatron and LHC experiments have different ways of presenting results and it needs to be dealt with A Gurtu, M Grünewald: W/Z Report to the PDG Collab/Advisory Committee, LBNL, 26 -27 Oct 2018

Important results from LHC 1. ATLAS: W-mass 2. ATLAS and CMS: Limits on couplings 3. Some branching fractions now appearing A Gurtu, M Grünewald: W/Z Report to the PDG Collab/Advisory Committee, LBNL, 26 -27 Oct 2018

Precision LHC-ATLAS result on m. W = 80. 370 ± 0. 018 Ge. V combining with 80. 376 ± 0. 033 (LEP) & 80. 387 ± 0. 016 (Tevatron): world average is m. W = 80. 379 ± 0. 012 Ge. V A Gurtu, M Grünewald: W/Z Report to the PDG Collab/Advisory Committee, LBNL, 26 -27 Oct 2018

Quartic coupling parametrization at LEP/Tevatron A Gurtu, M Grünewald: W/Z Report to the PDG Collab/Advisory Committee, LBNL, 26 -27 Oct 2018

LHC formalism for quartic couplings A Gurtu, M Grünewald: W/Z Report to the PDG Collab/Advisory Committee, LBNL, 26 -27 Oct 2018

LEP era LHC era A Gurtu, M Grünewald: W/Z Report to the PDG Collab/Advisory Committee, LBNL, 26 -27 Oct 2018

An example from node S 043 AQC RPP 2018 A Gurtu, M Grünewald: W/Z Report to the PDG Collab/Advisory Committee, LBNL, 26 -27 Oct 2018

Mini-reviews • PDG: Providing world averages a crucial task (most quoted reference). • Purpose of MINI-REVIEW: Explain complicated averaging procedures, clarify terminology, present preliminary results: - Long mini-reviews: Notes on Z-boson, W-mass. - Shorter ones on: W-TGC’s (γWW, ZWW), ZZγ, Zγγ, ZZV Couplings Anomalous W/Z Quartic couplings. • All are revised for every hardcopy/WEB edition, and a new one written if necessary. A Gurtu, M Grünewald: W/Z Report to the PDG Collab/Advisory Committee, LBNL, 26 -27 Oct 2018

Summary W Measurements: LEP, Tevatron, LHC • Uncertainties on Mass, Total width measurements ATLAS ± 18 Me. V, not done Tevatron ± 16, ± 49 Me. V LEP ± 33, ± 83 Me. V World ± 12, ± 42 Me. V • W Branching fractions, Decay modes: Mostly LEP Tevatron: µ/e, τ/e • Particle multiplicities in decay: ALL LEP • TGCs, AQCs: Actual measurements: LEP Limits: Tevatron and LHC starting to dominate – many parameters due to use of higher dimensional representation A Gurtu, M Grünewald: W/Z Report to the PDG Collab/Advisory Committee, LBNL, 26 -27 Oct 2018

Summary of Z measurements: LEP/SLC, Tevatron, LHC • Dominated by LEP/SLC results LEP most precise for purely statistics limited measurements (Mass, width, Branching fractions, …) LHC results creeping into BRs SLC-SLD most precise for measurements which use beam-polarization (asymmetry related). • Exceptions(!): g. Ve from CDF q qbar Z/γ* e+e • g. Vu, g. Vd, g. Au, g. Ad from Tevatron, HERA, LEP-SLC • gν(e, µ) from CHARM 2 (ν beam) • Anomalous ZZγ, Zγγ, ZVV couplings from LEP, Tevatron, LHC… • LHC: Again too many parameters A Gurtu, M Grünewald: W/Z Report to the PDG Collab/Advisory Committee, LBNL, 26 -27 Oct 2018

Expectations for 2018 -20 • LEP, Tevatron: tapered off • All action from LHC: W, Z couplings and W-mass - Expect CMS result on W mass, LHC combo; Tevatron + LHC proper combo world average (common error calculated jointly by Tevatron+LHC expts team, currently estimated by Erler in EW Moriond-17) - Hope for more coherent results/combos of anomalous couplings limits from ATLAS and CMS - Should expect more W & Z Branching fractions A Gurtu, M Grünewald: W/Z Report to the PDG Collab/Advisory Committee, LBNL, 26 -27 Oct 2018

Thank you A Gurtu, M Grünewald: W/Z Report to the PDG Collab/Advisory Committee, LBNL, 26 -27 Oct 2018