Recherche sur gluon fusion

Documentation pour "gluon fusion"

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• compass-II proposal wwwcompass.cern.ch - 21/07/2011 02:38:02 ...on key aspects of hadron structure and spectroscopy which are inaccessible to any other facility existing or under construction. The concept of GPDs attracted much attention after it was shown that the total angular momentum of a given parton species, J f for quarks (f = u, d or s) or J g for gluons, is related to the second moment of the sum of the two GPDs H and E. As of today, it is by far not fully understood how the nucleon spin 1 is shared between the contributions of 2 intrinsic and orbital angular momenta of quarks of various flavors and gluons. Constraining quark GPDs experimentally... Infos PDF : 19/06/2010 - 129 p. - 11.46 Mo - Version HTML

http://wwwcompass.cern.ch/compass/proposal/compass-II_proposal/compass-II_proposal.pdf

• pt 2006-10-04 kamor.ethz.ch - 09/12/2010 03:49:05 ...The total cross section The differential cross section Higgs production at hadron colliders Figure: The four dominant Higgs production mechanisms at the LHC. P. Trüb The Higgs pT spectrum 3 / 27 Theory Simulation Higgs production The total cross section The differential cross section Motivation Gluon fusion vs. associated production Cross section: σgluon σassoc Trigger: Associated production: two very forward jets Gluon fusion: one balancing high pT jet Example: h → bb vs. bbh → bbbb P. Trüb The Higgs pT spectrum 4 / 27 Theory Simulation Higgs production The total cross section The... Infos PDF : 3/10/2006 - 27 p. - 0.59 Mo - Version HTML

http://kamor.ethz.ch/conf/pt_2006-10-04.pdf

• pt 2007-02-21 kamor.ethz.ch - 09/12/2010 03:48:39 ...The total cross section The differential cross section Higgs production at hadron colliders Figure: The four dominant Higgs production mechanisms at the LHC. P. Trüb The Higgs pT spectrum 3 / 27 Theory Simulation Higgs production The total cross section The differential cross section Motivation Gluon fusion vs. associated production Cross section: σgluon σassoc Trigger: Associated production: two very forward jets Gluon fusion: one balancing high pT jet Example: h → bb vs. bbh → bbbb P. Trüb The Higgs pT spectrum 4 / 27 Theory Simulation Higgs production The total cross section The... Infos PDF : 5/03/2007 - 27 p. - 0.59 Mo - Version HTML

http://kamor.ethz.ch/conf/pt_2007-02-21.pdf

• 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 2006-06-23 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

• pt 2008-08-08 kamor.ethz.ch - 09/12/2010 03:51:08 ...Ï„ + Ï„ − ) P. Trüb H → Ï„ +Ï„ − → + − 2 / 38 Introduction Basics Event topology Two isolated leptons Balancing jet Signiï¬�cant missing transverse energy (ET ) P. Trüb H → Ï„ +Ï„ − → + − 3 / 38 Introduction Motivation (cf. Mellado et al. hep-ph/0406095) Advantages of including gluon fusion Larger signal cross section No need to understand very forward jets Disadvantages More background Balancing jet Helps reducing the Z 0 /γ ∗ background Improves the collinear approximation Used to calibrate ET P. Trüb H → Ï„ +Ï„ − → + − 4 / 38 Introduction Signal and backgrounds... Infos PDF : 8/08/2008 - 38 p. - 0.61 Mo - Version HTML

http://kamor.ethz.ch/pres/2008/pt_2008-08-08.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