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Establishing Standard LHC

Published byChristine Banks Modified over 6 years ago

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Presentation on theme: "Establishing Standard LHC"— Presentation transcript:

1 Establishing Standard Model @ LHC
Physics at the Energy Frontier QCD Soft Particles  Hard Jets Flavor sector J/ψ, Upsilon, B mesons, b-jets Electroweak Direct Photons  Z cross section 26-Jun-18 Sridhara Dasu (Wisconsin) - SEL2011

2 The Large Hadron Collider
2010 3.5 TeV 1032 cm–2s–1 40 MHz 106 Hz 26-Jun-18 Sridhara Dasu (Wisconsin) - SEL2011

3 Sridhara Dasu (Wisconsin) - SEL2011
LHC and CMS operations About 47pb-1 delivered by LHC and ~43pb-1 of data collected by CMS. Overall data taking efficiency ~92%. 6pb-1 of data integrated in a good fill. Excellent performance in coping with more than 5 order of magnitude increase in instantaneous luminosity. L≈ 2x1032cm-2s-1 L≈ 1027cm-2s-1 Average operational channels per CMS sub-system still >99%. Quality of the data for physics ~80% (likely 85% after re-reco) 26-Jun-18 Sridhara Dasu (Wisconsin) - SEL2011

4 Established the Standard Model at 7 TeV
26-Jun-18 Sridhara Dasu (Wisconsin) - SEL2011

5 Particle PT, Rapidity Spectra
arXiv: v2 [hep-ex] 6 Jul 2010 26-Jun-18 Sridhara Dasu (Wisconsin) - SEL2011

6 Charged Particle Production
arXiv: v1 [hep-ex] 24 Nov 2010 26-Jun-18 Sridhara Dasu (Wisconsin) - SEL2011

7 Charged Multiplicity vs η
arXiv: v1 [hep-ex] 22 Dec 2010 26-Jun-18 Sridhara Dasu (Wisconsin) - SEL2011

8 Charged Multiplicity vs PT
arXiv: v1 [hep-ex] 22 Dec 2010 26-Jun-18 Sridhara Dasu (Wisconsin) - SEL2011

9 Sridhara Dasu (Wisconsin) - SEL2011
Charged Multiplicity arXiv: v1 [hep-ex] 22 Dec 2010 26-Jun-18 Sridhara Dasu (Wisconsin) - SEL2011

10 Sridhara Dasu (Wisconsin) - SEL2011
Charged Particles arXiv: v1 [hep-ex] 3 Dec 2010 Sum PT vs PT Multiplicity vs PT Study underlying event characteristics using particles transverse to leading track 26-Jun-18 Sridhara Dasu (Wisconsin) - SEL2011

11 Sridhara Dasu (Wisconsin) - SEL2011
Charged Particles arXiv: v1 [hep-ex] 3 Dec 2010 Both ATLAS and CMS have determined best “tunes” for pythia underlying event soft QCD model Mean PT vs PT Mean vs Multiplicity Especially important for data-MC agreement needed for event quantities (MET) and isolation … 26-Jun-18 Sridhara Dasu (Wisconsin) - SEL2011

12 Two Particle Correlations
arXiv: v1 [hep-ex] 21 Sep 2010 Unexpected correlations seen for high multiplicity events 26-Jun-18 Sridhara Dasu (Wisconsin) - SEL2011

13 Jet PT, Rapidity Spectra
CMS PAS QCD Jul 2010 Core 26-Jun-18 Sridhara Dasu (Wisconsin) - SEL2011

14 3rd Jet PT, Rapidity Spectra
CMS PAS QCD Jul 2010 26-Jun-18 Sridhara Dasu (Wisconsin) - SEL2011

15 Dijet Angular Correlations
CMS PAS QCD Jul 2010 Rapidity Azimuthal Angle 26-Jun-18 Sridhara Dasu (Wisconsin) - SEL2011

16 Sridhara Dasu (Wisconsin) - SEL2011
Jet Structure CMS PAS QCD Jul 2010 Core 26-Jun-18 Sridhara Dasu (Wisconsin) - SEL2011

17 Sridhara Dasu (Wisconsin) - SEL2011
Integrated Shape vs PT arXiv: v1 [hep-ex] 30 Dec 2010 26-Jun-18 Sridhara Dasu (Wisconsin) - SEL2011

18 Integrated Shape Comparison
arXiv: v1 [hep-ex] 30 Dec 2010 26-Jun-18 Sridhara Dasu (Wisconsin) - SEL2011

19 Isolated Photon Spectrum
arXiv: v1 [hep-ex] 3 Dec 2010 26-Jun-18 Sridhara Dasu (Wisconsin) - SEL2011

20 Isolated Photon Spectra
arXiv: v2 [hep-ex] 21 Dec 2010 26-Jun-18 Sridhara Dasu (Wisconsin) - SEL2011

21 Sridhara Dasu (Wisconsin) - SEL2011
Resonances at 7 TeV 26-Jun-18 Sridhara Dasu (Wisconsin) - SEL2011

22 Sridhara Dasu (Wisconsin) - SEL2011
J/Ψ Production arXiv: v1 [hep-ex] 18 Nov 2010 26-Jun-18 Sridhara Dasu (Wisconsin) - SEL2011

23 Sridhara Dasu (Wisconsin) - SEL2011
Upsilon Production arXiv:submit/ [hep-ex] 26 Dec 2010 26-Jun-18 Sridhara Dasu (Wisconsin) - SEL2011

24 Sridhara Dasu (Wisconsin) - SEL2011
B+ψK Production arXiv:submit/ [hep-ex] 30 Dec 2010 26-Jun-18 Sridhara Dasu (Wisconsin) - SEL2011

25 Sridhara Dasu (Wisconsin) - SEL2011
b-Jet Production CMS PAS BPH Jul 2010 26-Jun-18 Sridhara Dasu (Wisconsin) - SEL2011

26 Sridhara Dasu (Wisconsin) - SEL2011
Weak Bosons at 7 TeV After lepton selection 26-Jun-18 Sridhara Dasu (Wisconsin) - SEL2011

27 W Signal and PT Spectrum
arXiv: v1 [hep-ex] 11 Oct 2010 PT of the boson is a laboratory for understanding soft QCD at low PT and hard QCD (NLO) at high PT 26-Jun-18 Sridhara Dasu (Wisconsin) - SEL2011

28 Z Signal and PT Spectrum
arXiv: v1 [hep-ex] 11 Oct 2010 PT of the boson is a laboratory for understanding soft QCD at low PT and hard QCD (NLO) at high PT 26-Jun-18 Sridhara Dasu (Wisconsin) - SEL2011

29 Sridhara Dasu (Wisconsin) - SEL2011
EWK Cross-sections arXiv: v1 [hep-ex] 11 Dec 2010 W Z W/Z W+/W- 26-Jun-18 Sridhara Dasu (Wisconsin) - SEL2011

30 Sridhara Dasu (Wisconsin) - SEL2011
W & Z Cross section arXiv: v1 [hep-ex] 11 Oct 2010 26-Jun-18 Sridhara Dasu (Wisconsin) - SEL2011

31 Sridhara Dasu (Wisconsin) - SEL2011
W, Z Cross Section vs √s arXiv: v1 [hep-ex] 11 Dec 2010 26-Jun-18 Sridhara Dasu (Wisconsin) - SEL2011

32 Sridhara Dasu (Wisconsin) - SEL2011
Jet production with Ws CMS PAS EWK Jul 2010 26-Jun-18 Sridhara Dasu (Wisconsin) - SEL2011

33 Leading Jet PT balancing W
CMS PAS EWK Jul 2010 Jets produced in association with vector bosons are primary final-state of many new physics processes. Important to understand quantitatively the differential production cross sections 26-Jun-18 Sridhara Dasu (Wisconsin) - SEL2011

34 Sridhara Dasu (Wisconsin) - SEL2011
W + Jets Multiplicity arXiv: v1 [hep-ex] 24 Dec 2010 26-Jun-18 Sridhara Dasu (Wisconsin) - SEL2011

35 Sridhara Dasu (Wisconsin) - SEL2011
W + Jets PT arXiv: v1 [hep-ex] 24 Dec 2010 26-Jun-18 Sridhara Dasu (Wisconsin) - SEL2011

36 W + Jets Ratio Early study comparing to NLO QCD event generators
arXiv: v1 [hep-ex] 24 Dec 2010 Early study comparing to NLO QCD event generators Both CMS and ATLAS have x30 data already Expect new results in Spring for both W and Z 26-Jun-18 Sridhara Dasu (Wisconsin) - SEL2011

37 Sridhara Dasu (Wisconsin) - SEL2011
W Mass – CDF Work 26-Jun-18 Sridhara Dasu (Wisconsin) - SEL2011

38 What Next? Precision EWK?
26-Jun-18 Sridhara Dasu (Wisconsin) - SEL2011

39 Sridhara Dasu (Wisconsin) - SEL2011
Summary LHC is off to a wonderful start in 2010 The detectors and accelerator are working well The Standard Model is well established at 7 TeV scale Several strong and electro-weak processes are measured already Look forward to several fb–1 data at 8 TeV in Detailed measurements, e.g., charge asymmetries, to improve parton distribution functions, improve W, top mass … Firmly establish vector-boson + jets and other processes to validate QCD NLO calculations and event generators Multi-boson production Prepare stage for unambiguous discoveries of higgs, SUSY and exotic new physics 26-Jun-18 Sridhara Dasu (Wisconsin) - SEL2011

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