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Documentation pour "gluon splitting"

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• ce 2008-07-22 kamor.ethz.ch - 09/12/2010 03:51:15 ...Introduction Simulation Trigger Reconstruction Tag & Probe Offline Analysis Systematics Results Normalization Production processes 0 Signal: Bs → µ+ µ− arbitrary units arbitrary units arbitrary units 900 800 700 600 500 400 300 200 100 0 0 10 20 30 p 40 T, B Background: bb → µ+ µ− + X gluon splitting flavor excitation gluon-gluon fusion gluon splitting flavor excitation gluon-gluon fusion 1200 1000 800 600 400 200 0 arbitrary units 50000 40000 30000 20000 10000 0 22000 20000 18000 16000 14000 12000 10000 8000 6000 4000 2000 0 0 2 4 6 gluon splitting flavor excitation gluon-gluon... Infos PDF : 22/07/2008 - 36 p. - 1.9 Mo - Version HTML

http://kamor.ethz.ch/pres/ce_2008-07-22.pdf

• as 2006-07-21 kamor.ethz.ch - 09/12/2010 03:53:02 ...lxy [cm] 0.8 1 A. Starodumov 0 Discovery potential for Bs → µ+ µ− Introduction Event simulation Trigger and Event selection Systematics Results and Conclusion Backup Samples Signal Background Signal events: composition arbitrary units arbitrary units 400 350 300 250 200 150 100 50 0 0 10 20 gluon splitting flavor excitation gluon-gluon fusion 180 160 140 120 100 80 60 40 20 arbitrary units 0 2 4 6 8 10 12 14 IV 450 220 200 300 250 200 150 100 50 0 0 0.5 1 1.5 2 R µµ 30 40 50 pT, B [GeV] 0 A. Starodumov 0 Discovery potential for Bs → µ+ µ− Introduction Event simulation Trigger and... Infos PDF : 20/07/2006 - 22 p. - 0.68 Mo - Version HTML

http://kamor.ethz.ch/pres/2006/as_2006-07-21.pdf

• ul 2006-07-28 kamor.ethz.ch - 09/12/2010 03:49:16 ... 10--15 µm • Silicon Strip Detector 10--14 points • Resolution: Urs Langenegger 0 Study of Bs → µ+ µ− in CMS (2006/07/28, XXXIII ICHEP 2006) 4 Overview • Search for a very rare decay Clean experimental signature → Efficiency and background reduction • b-hadrons produced in gluon splitting flavor excitation gluon-gluon fusion _ b b µ µ • Background composition two independent semileptonic B decays (mostly from gluon splitting) rare single B decays • Background reduction in analysis 2 final state muons consistent with one decay vertex large (transverse) flight length... Infos PDF : 5/08/2006 - 14 p. - 1.5 Mo - Version HTML

http://kamor.ethz.ch/conf/ul_2006-07-28.pdf

• ce 2006 10 09 kamor.ethz.ch - 09/12/2010 03:48:59 ...µm • Silicon Strip Detector 10--14 points • Resolution: Christina Eggel 0 Study of Bs → µ+ µ− in CMS (2006/10/09, Flavor in the era of the LHC) 4 Overview • Search for a very rare decay Clean experimental signature → Efficiency and background reduction • b-hadrons produced in gluon splitting flavor excitation gluon-gluon fusion _ b b µ µ • Background composition two independent semileptonic B decays (mostly from gluon splitting) rare single B decays • Background reduction in analysis 2 final state muons consistent with one decay vertex large (transverse) flight length... Infos PDF : 6/10/2006 - 16 p. - 1.53 Mo - Version HTML

http://kamor.ethz.ch/conf/ce_2006_10_09.pdf

• ul 2006-12-11 kamor.ethz.ch - 09/12/2010 03:48:52 ..."< 10× larger than at Tevatron Events can be triggered at high luminosity Urs Langenegger 0 Study of Bs → µ+ µ− in CMS (2006/12/11, CMS around Zurich) 2 Overview • Search for a very rare decay Clean experimental signature → Efficiency and background reduction • b-hadrons produced in gluon splitting flavor excitation gluon-gluon fusion _ b b µ µ • Background composition two independent semileptonic B decays (mostly from gluon splitting) rare single B decays • Background reduction in analysis 2 final state muons consistent with one decay vertex large (transverse) flight length... Infos PDF : 11/12/2006 - 10 p. - 0.28 Mo - Version HTML

http://kamor.ethz.ch/conf/ul_2006-12-11.pdf

• ce 2007-09-13 kamor.ethz.ch - 09/12/2010 03:48:15 ...Conclusions Heavy quark production at LHC Large Hadron Collider (LHC) " - pp-Collisions at s = 14 TeV every 25 ns - L = 1033 cm"2 s"1 - L = 2 × 1034 cm"2 s"1 b-hadron production at LHC - σbb ∼ 500µb - 1012 pairs of b quark after 1 year at L = 1033 cm−2 s−1 - production processes: → gluon-gluon-fusion → flavour excitation → gluon-splitting LHC startup plans (2008) - May :√ collisions ï¬�rst - July: s = 14 TeV - by Dec 2008: ∼ 1 fb−1 6 / 29 Introduction CMS Analysis Results Conclusions The CMS Experiment The Compact Muon Solenoid - Length 22 m , diameter 15 m, 13 kton -... Infos PDF : 13/09/2007 - 31 p. - 1.85 Mo - Version HTML

http://kamor.ethz.ch/conf/ce_2007-09-13.pdf

• ul 2006-06-23 kamor.ethz.ch - 09/12/2010 03:53:08 ...L[ fb−1] 117.0 Nana 4558 • Background Generator limited private production moved to different preselection Origin private σvis[f b] 1.74E + 07 Ngen 6.35E9 L[ fb−1] 6.54E − 04 Nana 11397 Urs Langenegger 0 Status of Bs → µ+ µ− Search (2006/06/23, SM Meeting) 4 Background Processes • Gluon-gluon fusion is NOT the dominant process Relative fractions of Gluon splitting Flavor excitation ratio ratio 1 0.9 0.8 0.7 1 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 10 20 30 40 50 60 pT [GeV] ratio 0 0 0.2 0.4 0.6 0.8 1 iso ratio 1 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 0.2 0.4 0.6 0.8 1 0 iso 0 2 4 6... Infos PDF : 23/06/2006 - 17 p. - 0.43 Mo - Version HTML

http://kamor.ethz.ch/pres/2006/ul_2006-06-23.pdf

• ul 2005-10-31 kamor.ethz.ch - 09/12/2010 03:53:57 ...and ECAL/HCAL) in cone around Bs candidate secondary vertex selection mass cut, mBs ± 40 MeV • Summary for 10/fb at L = 1033 cm−2 s−1 Urs Langenegger Status of B 0 → µ+ µ− (2005/10/31, Analysis PRS session I, CPT week) s(d) 3 Signal MC • datacards/bsmumu not a good choice only gluon fusion for bb production gluon splitting and avor excitation missing: different kinematics CKIN(3) not sufficient: soft Bs can decay into muons with p⊥ > 3 GeV ⇒ Production with MSEL 1 0 Events with Bs, force decay Bs → µ+µ− Muons: |η| < 2.4, p⊥ > 3 GeV • 20k signal events from ca.... Infos PDF : 29/10/2005 - 15 p. - 0.2 Mo - Version HTML

http://kamor.ethz.ch/pres/2005/ul_2005-10-31.pdf

• as 2007-03-14 kamor.ethz.ch - 09/12/2010 03:48:35 ...µ− ï¬�nal state) in PbPb @ 5.5TeV - direct probe of QGP formation - sensitive to “Colour Glass Condensateâ€� Andrey Starodumov Heavy Flavour in CMS 9 / 31 Introduction Overview HF Physics in CMS Conclusion Simulation I MC generator - PYTHIA 6.227, CTEQ5L - MSEL 5 for fast study and debugging Gluon-gluon Fusion (GF): gg(qq) → bb - MSEL 1 with bb selection for real study (∼1% initial efï¬�ciency) GF + Flavour Excitation (FE) gb → gb + Gluon Splitting (GS) g → bb Andrey Starodumov Heavy Flavour in CMS 10 / 31 Introduction Overview HF Physics in CMS Conclusion Simulation II MC generator... Infos PDF : 12/03/2007 - 32 p. - 4.6 Mo - Version HTML

http://kamor.ethz.ch/conf/as_2007-03-14.pdf

• ul 2006-07-20 kamor.ethz.ch - 09/12/2010 03:49:23 ...detectors: K/Ï€ separation • Quantitative understanding of performance maximal purity and resolution optimal efficiency vs. misidentification Urs Langenegger B Physics and Quarkonia (2006/07/20, Zuoz PSI Summerschool) 8 Production of b-Hadrons • Hadron colliders hadronization → all types g Gluon-gluon fusion b b _ • Electron machines: Z decays hadronization → all types g g g Gluon splitting B(Z → bb) = 15% _ Z o b b b Flavor excitation _ b • Electron machines: Î¥ (4S) decays ¯ B(Î¥ (4S) → B B) ∼ 100% e− e+ _ b Y(4S) b B= B0 /B+ d/u _ _ d_ u _ / B= B0 /B− b g 9 Urs... Infos PDF : 22/07/2006 - 84 p. - 8.3 Mo - Version HTML

http://kamor.ethz.ch/conf/ul_2006-07-20.pdf