Plan for Electroweak Papers 2010-2011

Gautier Hamel de Monchenault, Michael Schmitt, Juan Alcaraz

The papers are listed chronologically (earliest papers first, latest papers last). The titles are informal - real titles would be assigned later.

Note:

• p_T refers to the lepton
• q_T refers to the boson
• σ₀ refers to the inclusive cross section for that given leptonic channel (i.e., the BR is implied, for this page)

Production of W Bosons at 7 TeV

• This is the first electroweak paper.
• As soon as we accumulate a few hundred candidate events in the electron and muon channels, we publish.
• There should not be separate electron and muon papers - try hard to include both.
• This paper should be fast - aim for summer conferences if we get the data.
• Show the M_T distributions, and estimates of the QCD background.
• Show lepton reconstruction and MET measurement in CMS.
• Measurements:
  1. the total cross section unless we don't know the integrated luminosity.
  2. normalized p_T distribution, i.e., (1/σ₀)⋅(dσ/dp_T)
     • p_T refers to the lepton
     • background-subtracted
     • do we want to unsmear this? It is probably fairly easy...

Study of W and Z Boson Production at 7 TeV

• Second electroweak paper - soon but not rushed.
• Goal is to show that we can do accurate measurements of inclusive cross sections.
• This paper will report both electron and muon results.
• Ask for a few thousand W candidates and a few hundred Z candidates, in both electron and muon channels.
• Showcase our best methods for lepton reconstruction, efficiency and background estimations, etc.
• This paper should serve as a reference for other lepton-based measurements (top group, V+jets, etc.)
• measurements:
  • inclusive W cross section, including acceptance correction (reported explicitly)
  • inclusive Z cross section, for appropriate mass window, including correction for photon exchange
  • ratio of W+ and W− cross sections
  • ratio of W and Z cross sections

Measurement of the W-boson charge asymmetry

• Based on final 2010 event sample (perhaps including two different c.m. energies)
• lepton charge asymmetry based on pseudo-rapidity
• both electrons and muons, if possible (including combined measurements)
• comparison to modern PDFs

Drell-Yan Cross Section Measurement (dσ/dM)

• final 2010 event sample
• both electrons and muons
• from about 15 GeV up as far as the sample goes
• perhaps show the unfolded distribution - a careful analysis of the mass resolution, etc.
• can we do anything for PDFs?

Transverse Momentum (q_T) distribution of Z bosons

• final 2010 event sample
• unfolded distribution
• test and tune theoretical models for the low-q_T range
• test pQCD at high q_T

Reconstruction of the Z→ττ channel

• final 2010 event sample
• lepton + hadronic tau channel (maybe di-lepton too?)
• main point is to show the quality of the signal

Basic Measurement of V+Jet Rates

• final or almost-final 2010 event sample
• prefer both W and Z signals in one paper
• goal is to show the rate of jet production in association with a W and/or Z
• detailed jet studies come later
• inclusive jet counting, ie, ≥N_j jets
• measurements:
  • dσ/dN_j for W+jets and Z+jets
  • normalized: (1/σ₀) dσ/dN_j where σ₀ is the total inclusive cross section
  • quantitative comparison of W and Z
  • It would be nice to include b-tagging

Measurement of the Forward-Backward Asymmetry of Lepton Pairs

• final 2010 event sample
• unfolded A_FB as a function of di-lepton mass
• must use longitudinally-boosted Zs to determine the spin axis. Electrons only?
• We could extract a value for sin²θ_W but it will be for show only

Observation of W-γ and Z-γ final states in proton-proton collisions at √s =7 TeV

• final 2010 sample
• electrons and muons together
• place constraints on anomalous couplings

Observation of WW, WZ and ZZ final states in proton-proton collisions at √s =7 TeV

• final 2010 sample
• electrons and muons together
• place constraints on anomalous couplings

Detailed Study of V+Jets

• final 2010 event sample
• prefer both W and Z signals in one paper
• goal is to present corrected differential jet distributions
• inclusive jet counting, ie, ≥N_j jets
• measurements, probably normalized to σ₀
  • dσ/dE_T for each jet
  • dσ/dR_jj (jet separation)
  • dσ/dM_jj (di-jet mass)
  • dσ/dΔη (separation Δη between two leading jets)

Study of WZ, and ZZ final states in the di-jet mode

• final 2010 event sample
• one Z decays leptonically, the other weak boson decays to a jet pair
• we will include WW if it can be done.

First Measurement of the W Mass and Width with the CMS Detector

• final 2010 event sample
• will not be competitive with Tevatron measurements
• goal is to show that we can make a first measurement, and to set the ground for the future

-- MichaelSchmitt - 29-Dec-2009