CMS Electroweak Public Physics Results

Plots and Results

Electroweak Cross Sections (pdf, png). Simplified version (pdf, png).

Ratio CMS/Theory, 2010 (36 pb^-1) and 2011 (1.1 fb^-1 data) (pdf, png).

Latest CMS electroweak results

Date	CADI (restricted)	Analysis	Luminosity	Approved Plots	CDS Document	Notes
December 2011	EWK-11-003	Measurement of the weak mixing angle with the Drell-Yan process	1.1 fb-1		CMS-EWK-11-003	Phys. Rev. D 84, 112002 (2011)
November 2011	EWK-10-007	Measurement of the Drell-Yan Cross Section	36 pb-1		CMS-EWK-10-007	J. High Energy Phys. 10 (2011) 007
November 2011	EWK-10-005	W and Z inclusive cross sections	36 pb-1	link	CMS-EWK-10-005	J. High Energy Phys. 10 (2011) 132
October 2011	EWK-10-010	Measurement of the Rapidity and Transverse Momentum Distributions of Z Bosons	36 pb-1	link	CMS-PAS-EWK-10-010	arXiv:1110.4973 Accepted for publication in PRD
October 2011	EWK-10-012	Jet Production Rates in Association with W and Z Bosons	36 pb-1	link	CMS-EWK-10-012	arXiv:1110.3226 Accepted for publication in JHEP
September 2011	EWK-10-008	Measurement of W-γ and Z-γ Production	36 pb-1	link	CMS-EWK-10-008	Phys. Lett. B 701 (2011) 535–555
August 2011	EWK-10-013	Inclusive Z Cross Section via Decays to Tau Pairs	36 pb-1	link	CMS-EWK-10-013	J. High Energy Phys. 08 (2011) 117
August 2011	EWK-11-005	Update of the muon charge asymmetry	234 pb-1		CMS-EWK-11-005	LP preliminary, muon channel
July 2011	EWK-11-010	WW, WZ and ZZ cross sections	1.1 fb-1		CMS-PAS-EWK-11-010	EPS preliminary, leptonic modes
July 2011	EWK-11-013	W + charm production	1.1 fb-1		CMS-PAS-EWK-11-013	EPS preliminary, first measurment
July 2011	EWK-10-014	Polarization of W Bosons with Large Transverse Momenta in W+Jets Events	36 pb-1	link	CMS-EWK-10-014	Phys. Rev. Lett. 107 (2011) 021802
April 2011	EWK-10-006	Lepton charge asymmetry in inclusive W production	36 pb-1	link	CMS-EWK-10-006	J. High Energy Phys. 04 (2011) 050
March 2011	EWK-10-009	Measurement of W+W- and Search for the Higgs Boson	36 pb-1	link	CMS-EWK-10-009	Physics Letters B 699 (2011)
March 2011	EWK-10-011	Forward-Backward Asymmetry of DY pairs and measurement of weak mixing angle	36 pb-1	link	CMS-PAS-EWK-10-011	Moriond preliminary
March 2011	EWK-10-015	Z plus b-jet(s)	36 pb-1	link	CMS-PAS-EWK-10-015	Moriond preliminary
March 2011	EWK-11-002	W to τν	18 pb-1	link	CMS-PAS-EWK-11-002	Moriond preliminary
December 2010	EWK-10-002	First Measurement of Inclusive W and Z Cross Sections	2.9 pb-1		CMS-EWK-10-002	J. High Energy Phys. 01 (2011) 080

EWK results presented at the Poster Session of the LHCC, March 23, 2011

Recent presentations at Conferences

Date	Title	Speaker	Conference
November 2011	V+jets @ ATLAS/CMS	Benjamin Trocme	HCP2011
November 2011	W/Z Properties @ ATLAS/CMS	Javier Santaolalla	HCP2011
November 2011	Diboson Results @ CMS	A. Martelli/T. Bose	HCP2011
November 2011	Diboson studies	Jeff Klukas	USLUO
November 2011	EWK Results from CMS	Jamila Butt	USLUO
September 2011	WZ Production and Search for WZ Resonances	Srecko Morovic	BSM 2011
September 2011	CMS Standard Model Results	Vuko Brigljievic	BSM 2011
August 2011	W/Z and Diboson Production	Sara Bolognesi	PIC 2011
August 2011	W/Z Properties	Alex Melnitchouk	PIC 2011
August 2011	W,Z + jets Production	Sandro Gonzi	PIC 2011
August 2011	W,Z + jets Production	Michael Cutajar	QCD@LHC 2011
August 2011	Production of EW Bosons at Colliders	Matthias Mozer	Lepton Photon 2011
August 2011	Precision EW Meas. at Colliders	Jan Stark (D0)	Lepton Photon 2011
August 2011	Electroweak Physics	Michael Schmitt	DPF 2011
August 2011	Meas. of Z Diff. Cross-Sections	Joseph Gartner	DPF 2011
August 2011	Meas. of Drell-Yan Cross-Section	Stoyan Stoynev	DPF 2011
August 2011	W and Z Production and Asymmetries	Ji Yeon Han	DPF 2011
August 2011	W,Z + jets Production	Kira Grogg	DPF 2011
August 2011	Study of Diboson Production	Kalanand Mishra	DPF 2011
July 2011	WW, W+gamma and Z+gamma Production	Rahmat Rahmat	PANIC 2011
July 2011	Higgs Searches with Taus	Michail Bachtis	PANIC 2011
July 2011	Electroweak Physics	Juan Alcaraz	EPS 2011
July 2011	Diboson Production	Matthieu Marionneau	EPS 2011
July 2011	DY Cross Section and W Charge Asymmetry	Dimitri Bourilkov	EPS 2011
July 2011	W and Z in Association with Jets	Monika Grothe	EPS 2011
July 2011	Dimuon results in PbPb and pp collisions	Mihee Jo	EPIC@LHC
July 2011	V+jets and V+gamma	Emanuele Di Marco	LISHEP 2011
July 2011	Electroweak and jet measurements	Jeremy Mans	PDF4LHC
July 2011	W/Z and W/Z+jets Production	Efe Yazgan	SM Benchmarks at Hadron Colliders
April 2011	CMS results in electroweak physics	Juan Alcaraz	Joint EP/PP/LPCC CERN Seminar
April 2011	Results of V+jets	Lukas Vanelderen	SM@LHC 2011 Duhram
April 2011	W/Z cross-sections and asymmetries	Uta Klein (ATLAS)	SM@LHC 2011 Duhram
April 2011	W/Z cross-sections, dibosons	Jeremy Mans	LPCC EWK Workshop
April 2011	AFB and the Weak Mixing Angle	Andrei Gritsan	LPCC EWK Workshop
April 2011	W/Z plus jets	Matthias Mozer	LPCC EWK Workshop
March 2011	Results on W and Z plus jets	Vitaliano Ciulli	Moriond QCD 2011
March 2011	Standard Model Measurements	Phil Harris	Moriond EWK 2011
March 2011	Higgs and Z to tau tau	Christian Veelken	Moriond EWK 2011
March 2011	Measurement of the W Lepton Charge Asymmetry	Josh Bendavid	Moriond EWK 2011 -- YSF
March 2011	Study of W+gamma events	Devdatta Majumbar	Moriond EWK 2011 -- YSF
March 2011	Study of Z to ll polarisation	Nahn Tran	Moriond EWK 2011 -- YSF
March 2011	W to tau nu observation	Abdollah Mohammadi	Moriond EWK 2011 -- YSF

W and Z boson production cross sections with 2.9 pb^-1 at √s = 7 TeV

• Paper in CERN Document Server
• Submitted on December 11, 2010
• Published: JHEP 1101 (2011) 080
• Approved plots: and cross section measurements with 2.9 pb-1 plots

Event displays

W → μν candidate

Run number: 133875, Event number: 1228182, Luminosity block: 16

W → eν candidate

Run number: 133874 Event number: 21466935, Luminosity block 301

Z → μμ candidates

Run number: 135149 Event number: 125426133 , Lumi Section : 1345

Run number: 136087 Event number: 39967482 , Lumi Section : 314

Z → ee candidate

Run number: 133877 Event number: 28405693 , Lumi Section : 387

Major results

In the following table are briefly described the most recent EWK public results based on data and Monte-Carlo studies.

Date	Analysis	Main Results	Documentation
July 2010	Data: Measurement of the W and Z inclusive production cross sections at sqrt(s)=7 TeV with the CMS experiment at the LHC	We present the first measurements of inclusive W and Z production cross sections in muon and electron decay channels at sqrt(s)=7 TeV , obtained using 198 nb-1 of pp collisions in the Compact Muon Solenoid (CMS) detector at the Large Hadron Collider (LHC). The measured inclusive cross sections are sigma(pp -> W+X -> lnu+X)=9.22 +/- 0.24(stat) +/- 0.47(syst) +/- 1.01(lumi) nb, and sigma(pp -> Z+X -> lnu+X)=0.882 +0.077 -0.073(stat) +0.042 -0.036(syst) +/- 0.097(lumi) nb, limited to the di-lepton invariant mass range [60 - 120] GeV	PAS EWK-010-002
Sept 2010	Data: Study of tau reconstruction algorithms using pp collisions data collected at sqrt(s) = 7 TeV	Proton–proton collision events collected with the CMS experiment at LHC at a center–of–mass energy of sqrt(s) = 7 TeV in 2010 are used to commission the algorithms for reconstruction and identification of tau lepton hadronic decays. Four different types of algorithms are considered: three based on particle–flow event reconstruction and one based on combinations of tracks and calorimeter clusters. Probabilities for quark and gluon jets to pass the tau identification criteria of the different algorithms are measured in data dominated by QCD multi–jet events and compared to predictions of Monte Carlo simulations.	PAS PFT-10-004
March 2009	Monte Carlo: Measurement of the W and Z cross sections with muons at 10 TeV	We discuss and develop methods for the measurement of the cross sections pp ->W+X -> μn + X and pp -> Z + X -> μ+μ− + X with the CMS detector at the LHC, at a center-of-mass energy of 10 TeV. We assume an integrated luminosity of 10 pb−1. For the Z measurement, both the event yield and the average trigger, isolation, and reconstruction efficiencies can be extracted simultaneously from fits of the invariant mass spectrum. For the W measurement, we update results shown in the 2007/002 Physics Analysis Summary note.	PAS EWK-09-001
June 2009	Monte Carlo: Muon differential cross section and charge asymmetry in inclusive pp to W(mu-nu) + X production at 10 TeV	Inclusive pp to W(mu-nu) +X production at the LHC has a large cross section, of the order of ten nanobarns. Studies of the lepton pseudorapidity distribution can provide constraints on the Parton Distribution Functions (PDFs). The differential cross section results at 10 TeV are given for an integrated luminosity of 10 pb-1. The resulting W muon charge asymmetry, at an integrated luminosity of 100 pb-1, is determined to be in the range 0.004 to 0.006 statistical accuracy in 6 measurements of asymmetry as a function of muon pseudorapidity. This is comparable to the PDF uncertainties and can be used to constrain PDF models once the systematic errors are under control.	PAS EWK-09-003
June 2009	Monte Carlo: Prospects for measuring the WW production cross section at 10 TeV	Analysis strategy for measuring the WW production cross section in 100 pb-1 of pp collision data at sqrt(s) = 10 TeV. Based on Monte Carlo simulations of WW and the major background processes, we explore suitable background reduction cuts and develop data-driven methods to estimate those backgrounds. We present the event yields and statistical and systematic uncertainties that we expect to achieve with this analysis strategy. We estimate a total uncertainty on the cross-section of 30% or better.	PAS EWK-09-002
July 2009	Monte Carlo: Study of the ratio of W+jets to Z+jets at 10 TeV	Simulation study of the ratio of W+jets to Z+jets in pp collisions at sqrt(s) = 10 TeV and feasibility of measurements of the ratio up to four inclusive jets with O(100) pb-1 of early CMS data at the LHC. These measurements allow early understanding of W+jets and Z+jets production at the LHC, since several detector effects and theoretical uncertainties cancel out. They also provide means of implementing a data-driven normalization of the W+jets and Z+jets backgrounds important to Standard Model processes (e.g. top quark) and new physics searches.	PAS EWK-09-006
July 2009	Monte Carlo: Study of the Z to ee differential cross section as a function of Z rapidity at 10 TeV	Estimates for measurement of the shape of the rapidity distribution for Z bosons produced in proton-proton collisions with the CMS detector at sqrt(s)=10 TeV. We consider integrated luminosity scenarios from 10 to 100 pb-1. The results of this measurement will provide input to constrain the parton density function of the proton at the LHC for many measurements and searches.	PAS EWK-09-005
July 2009	Monte Carlo: Study of Z production in association with jets at 10 TeV	Simulation study of Z boson production in association with jets in pp collisions at sqrt(s)= 10 TeV and feasibility of significant measurements up to four inclusive jets with O(100) pb-1 of early CMS data at the LHC. QCD predicts a constant ratio of Z+n jets over Z+(n+1) jets yields while several new physics models are expected to produce an excess of events at high jet multiplicity. We present the measurement of this ratio in the dielectron+jets and dimuon+jets final states using tracker-based, calorimetry-based, and Particle Flow jet definitions. We discuss the Z+jets sample as a ’candle’ for both physics and detector commissioning.	PAS EWK-08-006
July 2009	Monte Carlo: Towards a Measurement of the Inclusive W to enu and γ*/Z->e+e cross sections at 10 TeV	Methods for an early measurement of the inclusive W and γ*/Z production cross sections in the electron decay channel, assuming 10 pb-1 of pp collision data at sqrt(s) = 10 TeV. A simple and robust electron selection is used. This selection is intended to anticipate imperfections in calibration and alignment of the CMS detector in early data. Data driven methods have been used to measure the selection efficiencies, to tune the selection cuts, and to subtract the background in the W case. The electroweak boson signal yields can be measured with a statistical precision of less than 2.0% in each case, while the systematic biases in our methods have been estimated from simulation studies to be 4.0% and 2.4% for W and Z, respectively. Initial precision in the integrated luminosity measurement of 10% is expected to dominate the precision of the cross section measurements.	PAS EWK-09-004

Publications

• Papers
• Physics Analysis Summaries with collision data
• Physics Analysis Summaries from MC studies (a list can be found here)

Contact

• CMS Electroweak Physics Analysis Group Conveners: Michael Schmitt and Gautier Hamel de Monchenault

-- JulieMalcles - 08-Sep-2010