Search for the decay B c  B s  Masato Aoki September 13, 2006 1.B s  J/  channel 1.Pion reconstruction efficiency 2.Cut variables and optimization.

Slides:

Advertisements

Similar presentations

January 6, B Tagging in Jets at Hadron Colliders Matthew Jones Purdue University Heavy Quark Production in Heavy Ion Collisions Purdue University,

Advertisements

07/16/2002 p. 1 Muon Fake RatesPetra Merkel Muon Fake Rates Concept: determine rate of fake muons due to pion/kaon punch-through (PT) muons out of pion/kaon.

Lepton Flavor Violation at LHCb The τ → μμμ decay Matt Jaffe Physics Department, Penn State University

Search for 7-prong  Decays Ruben Ter-Antonyan on behalf of the BaBar Collaboration Tau04 Workshop, Sep 14, 2004, Nara, Japan Outline:  Introduction 

1 Rare Decays of B Hadrons at CDF Matthew Jones October 3, 2005.

1 Rutherford Appleton Laboratory The 13th Annual International Conference on Supersymmetry and Unification of the Fundamental Interactions Durham, 2005.

16 May 2002Paul Dauncey - BaBar1 Measurements of CP asymmetries and branching fractions in B 0   +  ,  K +  ,  K + K  Paul Dauncey Imperial College,

Invariant Mass Calculation J/ψ Rosi Reed 10/31/07.

22 July 2005Mauro Donega HEP20051 B s lifetimes in hadronic decays at CDF Mauro Donegà Université de Genève on behalf of the CDF collaboration.

Pakhlov Pavel (ITEP, Moscow) Why B physics is still interesting Belle detector Measurement of sin2  Rare B decays Future plans University of Lausanne.

MC Study of B°  S Jianchun Wang Syracuse University BTeV meeting 06/27/01.

MC Study on B°  S (Status Report) Jianchun Wang Syracuse University BTeV meeting 05/25/01.

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.

1 Rare Decays At the Tevatron Cheng-Ju S. Lin (Fermilab ) BEAUTY 2006 OXFORD 28 September 2006.

University of Gaziantep Department of Engineering Physics August 2006 Page 1/18 A.Beddall, A.Beddall and A. Bingül Department of Engineering Physics University.

BR = ( (stat) ± 2(syst) ± 5 (BR))  From PDG * From MC * BR(  needs to be rescaled for f s /f d From Data b->sss pure penguin amplitude.

Search for B     with SemiExclusive reconstruction C.Cartaro, G. De Nardo, F. Fabozzi, L. Lista Università & INFN - Sezione di Napoli.

Radiative and Rare B-Decays at BaBar All results are preliminary unless journal ref. is given limit values are 90% CL unless otherwise specified Carsten.

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

Chris Barnes, Imperial CollegeWIN 2005 B mixing at DØ B mixing at DØ WIN 2005 Delphi, Greece Chris Barnes, Imperial College.

B Production and Decay at DØ Brad Abbott University of Oklahoma BEACH 2004 June 28-July 3.

MC Study on B°  J/  ° With J/      °     Jianchun Wang Syracuse University BTeV meeting 03/04/01.

B physics: new states, rare decays and branching ratios in CDF Vyacheslav Krutelyov Texas A&M University For CDF Collaboration July 1, 2004 BEACH04 Chicago,

Winter Meeting, Santiago de Compostela Bs  μ+μ- in LHCb PROGRAMA NACIONAL DE BECAS FPU Diego Martínez Santos Universidade de Santiago de Compostela (USC)

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.

Donatella Lucchesi1 B Physics Review: Part II Donatella Lucchesi INFN and University of Padova RTN Workshop The 3 rd generation as a probe for new physics.

B S Mixing at Tevatron Donatella Lucchesi University and INFN of Padova On behalf of the CDF&D0 Collaborations First Workshop on Theory, Phenomenology.

B c Results from CDF II Satyajit Behari (For the CDF Collab.) Johns Hopkins Univ., Baltimore,USA 23 rd Jul HEP2005 Europhysics Conference, Lisboa,

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.

D 0 Measurement in Cu+Cu Collisions at √s=200GeV at STAR using the Silicon Inner Tracker (SVT+SSD) Sarah LaPointe Wayne State University For the STAR Collaboration.

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

February 28, 2008Les Rencontres de Physique de la Vallee d'Aoste, B States at the Tevatron Matthew Jones Purdue UniversityPurdue University/CDFCDF.

Tampa - April 19, 2005APS April Meeting – M.Rossi1 DILEPTON TRIGGER for SUSY CDF Melisa Rossi - Udine University APS April Meeting Tampa, Florida.

B c mass, lifetime and BR’s at CDF Masato Aoki University of Tsukuba For the CDF Collaboration International Workshop on Heavy Quarkonium BNL.

Gavril Giurgiu, Carnegie Mellon, FCP Nashville B s Mixing at CDF Frontiers in Contemporary Physics Nashville, May Gavril Giurgiu – for CDF.

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,

Search for B s →  +  - and B d →  +  - Decays at CDF Cheng-Ju Lin (Fermilab) Representing CDF Collaboration SUSY 2004 Tsukuba, Japan June 17, 2004.

Search for Rare Decays of the B S Meson at the Tevatron Ralf Bernhard University of Zurich XLIst Rencontres de Moriond QCD 19 th March 2006.

Paper on J/  and b production Wenbin Qian, Patrick Robbe for the F-WG, Tsinghua Beijing/LAL Orsay, 2 Dec 2009.

The inсlusive produсtion of the meson resonanсes ρ 0 (770), K * (892), f 0 (980), f 2 (1270) in neutrino- nuсleon сharged сurrent (CC) interaсtions Polyarush.

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

1 Marek Szczekowski, Artur Ukleja Warsaw Group 3 June 2015 Model-independent search for CPV in three-bodies charm baryon decays Outline Selections for.

1 Warsaw Group May 2015 Search for CPV in three-bodies charm baryon decays Outline Selections Mass distributions and reconstructed numbers of candidates.

1 Sinéad M. Farrington University of Oxford for the CDF Collaboration HQL 15 th October 2010 Rare B and D Decays at CDF.

Matthew Martin Johns Hopkins University for the CDF collaboration andBranching Ratios from Flavor Physics & CP Violation Ecole Polytechnique, Paris, France.

Julia Thom, FNALEPS 2003 Aachen Rare Charm and B decays at CDF Julia Thom FNAL EPS 7/18/2003 Tevatron/CDF Experiment Decay Rate Ratios and CP Asymmetries.

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

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,

Rare decays of charm & bottom atTevatron  Introduction  Tevatron  CDF & DØ Detector  Rare charm decays  Rare bottom decays  Summary & Conclusions.

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.

Daniel Sherwood 03/2005 Search for Crypto-Exotic States in Babar Daniel Sherwood Dr. Liliana Teodorescu.

Sinéad Farrington University of Glasgow for the CDF Collaboration European Physical Society Aachen, 17 th -23 rd July 2003 B Lifetimes and Flavour Tagging.

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

2008 European School of High-Energy Physics - Trest, Czech Republic - 19 August - 1st September Target Tracker Data Analysis In OPERA Experiment S. Dmitrievsky,

Exotic Quarkonium Spectroscopy & Production Jane Nachtman on behalf of the CMS Collaboration University of Iowa, USA Charm 2013, 31 August – 4 Sept, 2013,

Quark Matter 2002, July 18-24, Nantes, France Dimuon Production from Au-Au Collisions at Ming Xiong Liu Los Alamos National Laboratory (for the PHENIX.

Higgs Recoil Mass Measurement and ZH Cross Section Tim Barklow, Awatif Belymam SLAC Feb 24, 2009.

1 Rare B Decays At CDF Michael Weinberger (Texas A&M University ) For the CDF Collaboration DPF 2006 November 1, 2006.

B meson studies - from commissioning to new physics effects.

B States at the Tevatron

MVA Results Selection efficiency before

Rare and Forbidden Charm Meson Decays in FOCUS

W. Wester, CDF, Fermilab, Beauty 2005, Assisi

The KL reconstruction for the Belle experiment at KEK B-factory

Bs  μ+μ- in LHCb Diego Martínez Santos

Search for Lepton Flavour Violation in the decay  → BaBar

10 TeV BJ/K at CMS Zheng Wang Apr

BesMUC Reconstruction Algorithm

Charmed Baryon Spectroscopy at BABAR

Presentation transcript:

Search for the decay B c  B s  Masato Aoki September 13, B s  J/  channel 1.Pion reconstruction efficiency 2.Cut variables and optimization 2.First check B s  D s ,D s   data

Pion(from B c ) reconstruction & vertexing efficiency B c  B s , B s  J/  Monte Carlo :10,000,000 events generated –Reconstruct only B s meson events –Reconstruct pion as well VtxFit Prob(  2 r-  )>0.1%, Si+COT hits events  58 % (just reconstructed : events : 73%)

Pre-selection dataset : xpmm0d, 0h and 0i with v13 goodrun list (1.1fb -1 ) p T > 0.35 GeV for all tracks Number of Silicon r-  hit layers >= 3 for all tracks Number of COT axial hit layers (with minimum 5 hits) >=3 for  and  tracks Muons – p T > 1.5 GeV,  2 stub < 9 for CMU muons – p T > 2 GeV,  2 stub < 9 for CMX muons –  (  ) < 120degree Mass window –  mass window : 10 MeV around PDG  mass – J/  mass window : 50 MeV around PDG J/  mass (mass constraint) – B s mass window : 30 MeV around GeV (mass constraint) Vertex –Prob(  2 r-  ) > 0.1 % for the B s and B c vertex fitting

Variables to be optimized p T (B c ), p T (B s ), p T (J/  ), p T (  ), p T (  ) Impact parameter of B c : d xy  R(B s,  ) ct(B c ), ct(B s  B c ), ct(B s  PV) Signal : Monte Carlo (pre-selection : 11 events expected) Background : data (sideband events) Maximize S / (1.5 + Sqrt(B)) N-1 iteration method Cleanup 30 MeV B s  mass window (corresponding to 3  )

[GeV/c]

[cm]

[GeV/c]

[cm]

[GeV/c]

Optimized cut variables p T (B c ) > 4.15 GeV p T (B s ) > 0 GeV, p T (J/  ) > 0 GeV p T (  ) > 1.49 GeV p T (  ) > 1.25 GeV |d xy (B c )| < 77  m  R(B s,  ) <  m < ct(B c ) < 1740  m -550  m < ct(B s  B c ) < 4060  m 200  m < ct(B s  PV) < 3620  m Expected events in 30 MeV B s  mass window  expected S/N = 2.37 / 1.17

Blind Box : ± 3  [0.005(uncertainty)+0.005(resolution)]

B s  D s , D s   stripped dataset : chdl07, skbh01 (no one uses those datasets) Obtained ~1000 B s, this should be ~1500(mixing analysis) What’s wrong? Bug? Trigger? Selection? Goodrun? Fit modeling?

Summary Cut optimization was performed –Expected events : S/N = 2.37 / 1.17 –Are there much better variables? –Likelihood? Neural Network? Looked at B s  D s ,D s   stripped dataset –A large disagreement was observed