10 TeV BJ/K at CMS Zheng Wang Apr. 2009.

Slides:

Advertisements

Similar presentations

Status of the LHCb Experiment 杨振伟 Tsinghua Group on LHCb 2010 高能物理学术年会.

Advertisements

Emily Thompson May 5 – UMass HEP Exp Group Meeting 1 Tag-probe method: Fitting Z → μ + μ - mass peaks Motivation: 1. Want to use long p T tail of muon.

1D. Dutta, BARC CMS Ann HI Meet 20 th June 2008 Z 0 studies in CMS:Status &Workplan Dipanwita Dutta NPD, BARC, Mumbai.

The new Silicon detector at RunIIb Tevatron II: the world’s highest energy collider What’s new?  Data will be collected from 5 to 15 fb -1 at  s=1.96.

A Method to measure  + /   detection efficiency asymmetry at LHCb Liming Zhang 08/15/07.

Count rate estimates from TDR Assuming beam intenisties from previous slide and acc *rec from SIM LH2 case [counts/24h] p [GeV/c] beam momentum Solid.

Study of e + e  collisions with a hard initial state photon at BaBar Michel Davier (LAL-Orsay) for the BaBar collaboration TM.

Measurement of the Branching fraction B( B  D* l ) C. Borean, G. Della Ricca G. De Nardo, D. Monorchio M. Rotondo Riunione Gruppo I – Napoli 19 Dicembre.

Xiaoyan LinQuark Matter 2006, Shanghai, Nov , Study B and D Contributions to Non- photonic Electrons via Azimuthal Correlations between Non-

Experimental Research on School of Physics, Peking University at the CMS Bo ZHU  Motivation  Results of MC  Conclusion.

 Candidate events are selected by reconstructing a D, called a tag, in several hadronic modes  Then we reconstruct the semileptonic decay in the system.

Lepton/Photon 2003, Batavia, IL, USA August 11 th – 16 th Measurement of  b Branching Ratios in Modes Containing a  c Why are the  b branching fractions.

G. Eigen, LISHEP2011, Rio de Janeiro, July 5 th, Outline Introduction Introduction ATLAS detector and performance Vertex and impact parameter resolution.

Archana Sharma, Suman Beri Panjab University Chandigarh India-CMS meeting TIFR, Jan Updates on the RPC trigger efficiency work with data driven.

N  for 2012 Zhiyong Wang May, 12,2015 Charmonium group meeting 1.

Prompt J/  and b ➝ J/  X production in pp collisions at LHCb Patrick Robbe, LAL Orsay & CERN, 7 Dec 2010 For the LHCb Collaboration KRUGER 2010 Workshop.

Kalanand Mishra April 27, Branching Ratio Measurements of Decays D 0  π - π + π 0, D 0  K - K + π 0 Relative to D 0  K - π + π 0 Giampiero Mancinelli,

Quarkonia spectra in PbPb at 2.76 TeV Abdulla Abdulsalam (Dr. Prashant Shukla) BARC, Mumbai Outline Motivation Event selection Kinematic cuts Acceptance.

Charm Physics Potential at BESIII Kanglin He Jan. 2004, Beijing

 0  5  Outline Event selection & analysis Background rejection Efficiencies Mass spectrum Comparison data-MC Branching ratio evaluation Systematics.

Lukens - 1 Fermilab Seminar – July, 2011 Observation of the  b 0 Patrick T. Lukens Fermilab for the CDF Collaboration July 2011.

Measurement of Bc +, B + production Cross Section at 7 TeV pp collision at CMS ICTP-NCP school on LHC Physics On behalf of CMS Collaboration November 19.

Paul Balm - EPS July 17, 2003 Towards CP violation results from DØ Paul Balm, NIKHEF (for the DØ collaboration) EPS meeting July 2003, Aachen This.

Study of pair-produced doubly charged Higgs bosons with a four muon final state at the CMS detector (CMS NOTE 2006/081, Authors : T.Rommerskirchen and.

Update on WH to 3 lepton Analysis And Electron Trigger Efficiencies with Tag And Probe Nishu 1, Suman B. Beri 1, Guillelmo Gomez Ceballos 2 1 Panjab University,

Mike HildrethEPS/Aachen, July B Physics Results from DØ Mike Hildreth Université de Notre Dame du Lac DØ Collaboration for the DØ Collaboration.

4/12/05 -Xiaojian Zhang, 1 UIUC paper review Introduction to Bc Event selection The blind analysis The final result The systematic error.

Penny Kasper Fermilab Heavy Quarkonium Workshop 21 June Upsilon production DØ Penny Kasper Fermilab (DØ collaboration) 29 June 2006 Heavy Quarkonium.

Tomas Hreus, Pascal Vanlaer Overview: K0s correction stability tests Jet-pt correction closure test Study of Strangeness Production in Underlying Event.

Kalanand Mishra June 29, Branching Ratio Measurements of Decays D 0  π - π + π 0, D 0  K - K + π 0 Relative to D 0  K - π + π 0 Giampiero Mancinelli,

HI July Exercise and Muon DQM preparation Mihee Jo Mihee Jo / Lab meeting.

Kalanand Mishra February 23, Branching Ratio Measurements of Decays D 0  π - π + π 0, D 0  K - K + π 0 Relative to D 0  K - π + π 0 decay Giampiero.

ICSHEP 8, Apr , CMS BOnia physics: J/Psi & Inclusive b(  J/PsiX) production x- Section Xiangwei Meng Guoming Chen Institute of.

QM2004 Version1 Measurements of the  ->     with PHENIX in Au+Au Collisions at 200 GeV at RHIC PPG016 Figures with Final Approval Charles F. Maguire.

Tomas Hreus, Pascal Vanlaer Study of Strangeness Production in Underlying Event at 7 TeV 1QCD low pT meeting, 18/03/2011.

Study of B s         Supreet Pal Singh Prof. Kajari Mazumdar Prof. J.B.Singh 1India-CMS Meeting 27th-28th.

Feasibility study of Higgs pair creation in gamma-gamma collider Hiroshima University Nozomi Maeda 19.April 2009.

M. Martemianov, ITEP, October 2003 Analysis of ratio BR(K     0 )/BR(K    ) M. Martemianov V. Kulikov Motivation Selection and cuts Trigger efficiency.

1 D *+ production Alexandr Kozlinskiy Thomas Bauer Vanya Belyaev

Observation of Exclusive Charmonium Production and    in pp Collisions at CDF II James Pinfold University of Alberta For the CDF Collaboration.

Eff. determination WANG Zheng Mar Feb.2008WANG Zheng2 The method  Eff. Determined from MC sample.  Eff. Determined from data. Object id/efficiency:

Study of B s         Supreet Pal Singh Prof. Kajari Mazumdar Prof. J.B.Singh 1India LHC weekely meeting.

Open and Hidden Beauty Production in 920 GeV p-N interactions Presented by Mauro Villa for the Hera-B collaboration 2002/3 data taking:

QWG Sept 20-22, Jundong Huang Indiana University 1 DØ Quarkonium Production at DØ Jundong Huang Indiana University Quarkonium Workshop FermiLab September.

Search for Standard Model Higgs in ZH  l + l  bb channel at DØ Shaohua Fu Fermilab For the DØ Collaboration DPF 2006, Oct. 29 – Nov. 3 Honolulu, Hawaii.

Upsilon production and μ-tagged jets in DØ Horst D. Wahl Florida State University (DØ collaboration) 29 April 2005 DIS April to 1 May 2005 Madison.

 (2S) cross section and search for narrow resonances below the Upsilon mesons at CDF Alberto Annovi - INFN Frascati for the CDF collaboration International.

CMSSW_3_1_1 preproduction samples

Studies of prompt photon identification and 0 isolation in first p-p collisions at √s=10 TeV May 20, 2009 Meeting Frascati Raphaëlle Ichou.

Muon momentum scale calibration with J/y peak

Measurement of inclusive branching fraction for y(3686)fX

Last two years of CMS physics study in Peking University

p0 life time analysis: general method, updates and preliminary result

Quarkonium production in ALICE

Reddy Pratap Gandrajula (University of Iowa) on behalf of CMS

Reconstruction of short-lived resonances in pp collisions

Prospects for quarkonium studies at LHCb

Study of e+e collisions with a hard initial state photon at BaBar

(2S) Measument with CMS 10 TeV Data

Status of the H4l CSC Note (HG2)

(2S) Measument with CMS 10 TeV Data

Samples and MC Selection

Contents First section: pion and proton misidentification probabilities as Loose or Tight Muons. Measurements using Jet-triggered data (from run).

Gluon Gluon to jpsi jpsi

Gluon Gluon to jpsi jpsi

Z. X. Zhang , G. M. Chen, X. Y. Wang, et al 2009/11/27

b and c production in CMS and ATLAS

Gluon Gluon to jpsi jpsi

Presentation transcript:

10 TeV BJ/K at CMS Zheng Wang Apr. 2009

The data sample BtoJpsiMuMu: Generated with CMSSW_2_1_7 or CMSSW_2_1_8 /BtoJpsiMuMu/Summer08_IDEAL_V9_v2/GEN-SIM-RECO , 2,434,076 events, (T2_US_Purdue, T2_CH_CSCS, T1_DE_FZK, T2_CN_Beijing) Generated with CMSSW_2_1_7 or CMSSW_2_1_8 We used 992,800 events to perform the following analysis, corresponding to 43.5pb-1 data. 24. Mar. 2009 Zheng Wang

How to get the cross-section? Filter N(B+obs): Fit the Inv. mass of J/ and K spec., subtracting the background. Br(B+J/K+)=(1.0080.035)×10-3; Br(J/)=(5.930.06)×10-2; L: Int. luminosity. tri = N pass J/ trigger / Ninit. B rec : B meson reconstruction efficiency after the corrections. 24. Mar. 2009 Zheng Wang

HLT efficiency 24. Mar. 2009 Zheng Wang

B reconstruction: Selection Criteria Use the combination of J/ and on charged track to reconstruct B meson, CMS can not PID. At least two globalMuon candidates with ||< 2.5 and Pt>2.5GeV/c . Muon pairs reconstruct the J/ meson, the pair with the inv. mass closest to the J/ mass is selected. The m() in2.95-3.25 GeV/c^2. The other charged tracks Pt are required to be greater than 2.0 GeV/c , ||< 2.5, and are considered to be kaon particle. Two muons from J/psi and one charged tracks are performed a kinematic vertex fit, the Prob(fit) > 0.001. in the fitting, the inv. mass of two muons is constrained to be J/ mass, three tracks derive from common vertex. 24. Mar. 2009 Zheng Wang

Muon and J/  39.1 MeV M3.12 GeV 24. Mar. 2009 Zheng Wang

Plots for Vertex kinematic fit Prob>0.001 24. Mar. 2009 Zheng Wang

B mass 14 TeV 45.6MeV 22.5MeV 10 TeV 24. Mar. 2009 Zheng Wang

Differential X-section d/dpT(B) Start the measurement from 9 GeV/c, 7 Pt bins, Try to make observed B meson in each bins to be same. 24. Mar. 2009 Zheng Wang

24. Mar. 2009 Zheng Wang

Fit technique Extract signal in each pT bin by 1-D maximum LH fit to B mass; One Gaussian for B mass with a linear bg; Short mass fitting range as CDFII’s analsyis to decrease the sys. error from bg. Shape. Do not think using triple gaussian will be better, when running on real data, the bg. BJ/ and BJ/+X with very soft  will contaminate the signal. 2D(mass+ct) fit do not help to extinguish the signal and bg. Prompt J/ contribute a random bg in B mass spectrum. 24. Mar. 2009 Zheng Wang

Full efficiency(HLT_DoubleMu3) 24. Mar. 2009 Zheng Wang

Full eff. and X-section 24. Mar. 2009 Zheng Wang

Both Mass and mass reso. are almost independent on B meson pT B performance PDG value Both Mass and mass reso. are almost independent on B meson pT 24. Mar. 2009 Zheng Wang

Next/ongoing sys. uncertainty determination; Background. Thanks. 24. Mar. 2009 Zheng Wang

backup 24. Mar. 2009 Zheng Wang