The Search For Vh Bf To Vww Standard Model Higgs Production In The Trilepton Signature With Bf5 9 Fb Of Data From Bf Ppbar Collisions At Bf Sqrt S
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The Search For Vh Bf To Vww Standard Model Higgs Production In The Trilepton Signature With Bf5 9 Fb Of Data From Bf Ppbar Collisions At Bf Sqrt S
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Author :
language : en
Publisher:
Release Date : 2010
The Search For Vh Bf To Vww Standard Model Higgs Production In The Trilepton Signature With Bf5 9 Fb Of Data From Bf Ppbar Collisions At Bf Sqrt S written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with categories.
We present here the search for Standard Model VH → VWW → lll + E{sub T} (missing energy due to neutrinos) production, where V is a W or Z weak vector boson, which uses up to 5.9 fb−1 of integrated luminosity. This analysis has recently added to the CDF high-mass Higgs group three new signal topologies characterized by a tri-lepton signature, which are chosen to isolate the VH → VWW associated production signals in the three-lepton signature. As such, we define three new regions for a WH analysis, a ZH 1-jet analysis, and a ZH ≥ 2-jet analysis with which we expect to contribute an additional ≈ 5.8% (for m{sub H} = 165 GeV) acceptance to the current H → WW dilepton analysis. The ZH trilepton regions are defined by events passing a Z-boson selection: events having at least one lepton pairing (among three possible pairings) with opposite sign, same flavor, and a dilepton invariant mass within [76.0, 106.0] GeV - a ± 15 GeV window around the Z-boson mass. The WH trilepton region is then defined as the set of trilepton events that are complement to those chosen by the Z-boson selection. These three new event topologies make a substantial contribution to the H → WW group result. As a measure of the sensitivity of this search, we compute the median expected limit on the at 95% confidence level ('C.L.') on the production cross section (effectively the rate of production) for a Standard Model Higgs boson and report the result as a ratio to the theoretical production cross section. An observed limit ratio of one or less at a given mass would rule out the production of a Standard Model Higgs boson at that mass with 95% confidence. At m{sub H} = 165 GeV, the WH analysis expected limits reach 7.2 times the standard model cross section; the ZH 1-jet analysis is set at 29 times the expected standard model cross section; the ZH ≥ 2-jet analysis is set at 9.9 times the expected standard model cross section; and the combined trilepton analysis is set at 4.9 times the expected standard model cross section. We announce that the combination of this trilepton VH → VWW Higgs boson search and the previous CDF dilepton H → WW search achieves an expected median limit of 1.00 at 165 GeV/c2. The expected median limit of 1.00 indicates we anticipate a 50% probability of ruling out the existence of a Standard Model Higgs boson with a mass of 165 GeV/c2. This is the first time a single hadron collider experiment has achieved sensitivity to the production of a Standard Model Higgs boson. We do not see evidence for a significant signal of Higgs bosons in the data and place observed limits on the production of a Standard Model Higgs boson of 165 GeV/c2 at 1.08 times Standard Model production cross section.
The Search For Vh U2192 Vww Standard Model Higgs Production In The Trilepton Signature With 5 9fb 1 Of Data From P Bar P Collisions At U221a S
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Author :
language : en
Publisher:
Release Date : 2010
The Search For Vh U2192 Vww Standard Model Higgs Production In The Trilepton Signature With 5 9fb 1 Of Data From P Bar P Collisions At U221a S written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with categories.
We present here the search for Standard Model V H → VWW → lll + ET (missing energy due to neutrinos) production, where V is a W or Z weak vector boson, which uses up to 5.9 fb-1 of integrated luminosity. This analysis has recently added to the CDF high-mass Higgs group three new signal topologies characterized by a tri-lepton signature, which are chosen to isolate the V H → VWW associated production signals in the three-lepton signature. As such, we define three new regions for a WH analysis, a ZH 1-jet analysis, and a ZH ≥ 2-jet analysis with which we expect to contribute an additional 5.8% (for mH = 165 GeV) acceptance to the current H → WW dilepton analysis. The ZH trilepton regions are defined by events passing a Z-boson selection: events having at least one lepton pairing (among three possible pairings) with opposite sign, same flavor, and a dilepton invariant mass within [76.0, 106.0] GeV–a ± 15 GeV window around the Z-boson mass. TheWH trilepton region is then defined as the set of trilepton events that are complement to those chosen by the Z-boson selection. These three new event topologies make a substantial contribution to the H → WW group result. As a measure of the sensitivity of this search, we compute the median expected limit on the at 95% confidence level (?C.L.?) on the production cross section (effectively the rate of production) for a StandardModel Higgs boson and report the result as a ratio to the theoretical production cross section. An observed limit ratio of one or less at a given mass would rule out the production of a Standard Model Higgs boson at that mass with 95% confidence. At mH = 165 GeV, the WH analysis expected limits reach 7.2 times the standard model cross section; the ZH 1-jet analysis is set at 29 times the expected standard model cross section; the ZH ≥ 2-jet analysis is set at 9.9 times the expected standard model cross section; and the combined trilepton analysis is set at 4.9 times the expected standard model cross section. We announce that the combination of this trilepton V H → VWW Higgs boson search and the previous CDF dilepton H → WW search achieves an expected median limit of 1.00 at 165 GeV/c2. The expected median limit of 1.00 indicates we anticipate a 50% probability of ruling out the existence of a Standard Model Higgs boson with a mass of 165 GeV/c2. This is the first time a single hadron collider experiment has achieved sensitivity to the production of a Standard Model Higgs boson. We do not see evidence for a significant signal of Higgs bosons in the data and place observed limits on the production of a Standard Model Higgs boson of 165 GeV/c2 at 1.08 times Standard Model production cross section. Matthew.
The Search For Vh Going To Vww Standard Model Higgs Production In The Trilepton Signature With 5 9fb 1 Of Data From Proton Antiproton Collisions At Center Of Mass Energy
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Author : Jason Michael Nett
language : en
Publisher:
Release Date : 2010
The Search For Vh Going To Vww Standard Model Higgs Production In The Trilepton Signature With 5 9fb 1 Of Data From Proton Antiproton Collisions At Center Of Mass Energy written by Jason Michael Nett and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with categories.
Search For A Low Mass Standard Model Higgs Boson At D0 In Ppbar Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2010
Search For A Low Mass Standard Model Higgs Boson At D0 In Ppbar Collisions At Sqrt S written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with categories.
We present combined searches for the low mass Standard Model Higgs boson at a center-of-mass energy of (square root)s = 1.96 TeV, using up to 5 fb−1 of data collected with the D0 detector at the Fermilab Tevatron collider. The major contributing processes are associated production (WH --> lvbb, ZH --> vvbb, ZH --> llbb). The significant improvements across the full mass range resulting from the larger data sets and improved analyses as well as future prospects are discussed.
Search For The Higgs Boson Decaying To W W With Associated Jets And Measurement Of The W W Production Cross Section And Differential Cross Sections With Jets In Ppbar Collisions At Square Root S
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Author :
language : en
Publisher:
Release Date : 2014
Search For The Higgs Boson Decaying To W W With Associated Jets And Measurement Of The W W Production Cross Section And Differential Cross Sections With Jets In Ppbar Collisions At Square Root S written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with categories.
A cross section measurement for the production of W+W- is performed. Differential measurements are reported as a function of jet multiplicity and transverse energy. The inclusive cross section is measured to be sigma(ppbar -> W+W- +X = 14.0 +/-0.6(stat) +1.2/-1.0(syst) +/-0.8(lumi) pb, consistent with the Standard Model prediction. Additionally, a search for the Higgs boson is performed in the final state of W+W- with two or more associated jets. Limits on the production cross section are set at the 95% confidence level, and combined with limits from related analyses. Both analyses use data collected by the CDF II detector from 9.7 fb-1 of luminosity
Search For The Standard Model Higgs Boson Decaying To A W Pair In The Fully Leptonic Final State In Pp Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2012
Search For The Standard Model Higgs Boson Decaying To A W Pair In The Fully Leptonic Final State In Pp Collisions At Sqrt S written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with categories.
A search for the standard model Higgs boson decaying to W+W- in pp collisions at sqrt(s) = 7 TeV is reported. The data are collected at the LHC with the CMS detector, and correspond to an integrated luminosity of 4.6 inverse femtobarns. The W+W- candidates are selected in events with two charged leptons and large missing transverse energy. No significant excess of events above the standard model background expectations is observed, and upper limits on the Higgs boson production relative to the standard model Higgs expectation are derived. The standard model Higgs boson is excluded in the mass range 129-270 GeV at 95% confidence level.
Search For The Standard Model Higgs Boson In The H Ww Lepton Neutrino Q Qbar Decay Channel
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Author :
language : en
Publisher:
Release Date : 2011
Search For The Standard Model Higgs Boson In The H Ww Lepton Neutrino Q Qbar Decay Channel written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with categories.
We present a search for the standard model Higgs boson (H) in ppbar collisions at sqrt{s}=1.96 TeV in events containing a charged lepton (ell), missing transverse energy, and at least two jets, using 5.4 fb-̂1 of integrated luminosity recorded with the D0 detector at the Fermilab Tevatron Collider. This analysis is sensitive primarily to Higgs bosons produced through the fusion of two gluons or two electroweak bosons, with subsequent decay H->WW->ell+nu+q'qbar, where ell is an electron or muon. The search is also sensitive to contributions from other production channels, such as WH->ell+nu+bbbar In the absence of signal, we set limits at the 95% C.L. on the cross section for H production sigma(ppbar->H+X) in these final states. For a mass of MH=160 GeV, the limit is a factor of 3.9 larger than the cross section in the standard model, and consistent with expectation.
Search For The Standard Model Higgs Boson In The Zh Vvbb Channel In 5 2 Fb 1 Of P Pbar Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2009
Search For The Standard Model Higgs Boson In The Zh Vvbb Channel In 5 2 Fb 1 Of P Pbar Collisions At Sqrt S written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with categories.
A search is performed for the standard model Higgs boson in 5.2 fb−1 of p{bar p} collisions at √s = 1.96 TeV, collected with the D0 detector at the Fermilab Tevatron Collider. The final state considered is a pair of b jets and large missing transverse energy, as expected from p{bar p} → ZH → [nu]{bar [nu]}b{bar b} production. The search is also sensitive to the WH → l{nu}b{bar b} channel when the charged lepton is not identified. For a Higgs boson mass of 115 GeV, a limit is set at the 95% C.L. on the cross section multiplied by branching fraction for (p{bar p} → (Z/W)H) x (H → b{bar b}) that is a factor of 3.7 larger than the standard model value, consistent with the factor of 4.6 expected.
Search For A Low Mass Standard Model Higgs Boson In The Tau Tau Decay Channel In P Bar P Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2012
Search For A Low Mass Standard Model Higgs Boson In The Tau Tau Decay Channel In P Bar P Collisions At Sqrt S written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with categories.
We report on a search for the standard model Higgs boson decaying into pairs of? leptons in p{bar p} collisions produced by the Tevatron at √s = 1.96 TeV. The analyzed data sample was recorded by the CDFII detector and corresponds to an integrated luminosity of 6.0 fb−1. The search is performed in the final state with one? decaying leptonically and the second one identified through its semi-hadronic decay. Since no significant excess is observed, a 95% credibility level upper limit on the production cross section times branching ratio to the?? final state is set for hypothetical Higgs boson masses between 100 and 150 GeV/c2. For a Higgs boson of 120 GeV/c2 the observed (expected) limit is 14.6 (15.3) the predicted value.
Improved Search For A Higgs Boson Produced In Association With Z L L In Proton Antiproton Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2010
Improved Search For A Higgs Boson Produced In Association With Z L L In Proton Antiproton Collisions At Sqrt S written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with categories.
We present a search for the standard model Higgs boson produced with a Z boson in 4.1 fb−1 of data collected with the CDF II detector at the Tevatron. In events consistent with the decay of the Higgs boson to a bottom-quark pair and the Z boson to electrons or muons, we set 95% credibility level upper limits on the ZH production cross section times the H --> b{bar b} branching ratio. Improved analysis methods enhance signal sensitivity by 20% relative to previous searches beyond the gain due to the larger data sample. At a Higgs boson mass of 115 GeV/c2 we set a limit of 5.9 times the standard model value.