Search For Zh Rightarrow Ell Ell B Bar B Production In 4 2 Fb 1 Of P Bar P Collisions At Sqrt S
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Search For Zh Rightarrow Ell Ell B Bar B Production In 4 2 Fb 1 Of P Bar P Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2010
Search For Zh Rightarrow Ell Ell B Bar B Production In 4 2 Fb 1 Of 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 2010 with categories.
We present a search for the standard model Higgs boson produced in association with a Z boson in 4.2 fb−1 of p{bar p} collisions, collected with the D0 detector at the Fermilab Tevatron at (square root)s = 1.96 TeV. Selected events contain one reconstructed Z --> ll− candidate and at least two jets, including at least one b-tagged jet. In the absence of an excess over the background expected from other standard model processes, limits on the ZH cross section multiplied by the branching ratios are set. The limit at M{sub H} = 115 GeV is a factor of 5.9 larger than the standard model prediction.
Search For Zh To Ell Ell B Bar B Production In 9 7 Fb 1 Of P Bar P Collisions With The D0 Detector
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Author :
language : en
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Release Date : 2013
Search For Zh To Ell Ell B Bar B Production In 9 7 Fb 1 Of P Bar P Collisions With The D0 Detector written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with categories.
Measurement Of The Ttbar Production Cross Section In 2 Fb 1 Of Ppbar Collisions At Sqrt S
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language : en
Publisher:
Release Date : 2009
Measurement Of The Ttbar Production Cross Section In 2 Fb 1 Of 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 2009 with categories.
We present a measurement of the t{bar t} production cross section in p{bar p} collisions at (square root)s = 1.96 TeV using events containing a high transverse momentum electron or muon, three or more jets, and missing transverse energy. Events consistent with t{bar t} decay are found by identifying jets containing candidate heavy-flavor semileptonic decays to muons. The measurement uses a CDF Run II data sample corresponding to 2 fb−1 of integrated luminosity. Based on 248 candidate events with three or more jets and an expected background of 79.5 ± 5.3 events, we measure a production cross section of 9.1 ± 1.6 pb.
Search For Zz And Z Gamma Production In P Barp Collisions At Sqrt S
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language : en
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Release Date : 2007
Search For Zz And Z Gamma Production In P Barp 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 2007 with categories.
The authors present a study of [mu][mu][mu][mu], eeee, and [mu][mu]ee events using 1 fb−1 of data collected with the D0 detector at the Fermilab Tevatron p{bar p} Collider at √s = 1.96 TeV. Requiring the lepton pair masses to be greater than 30 GeV, they observe one event, consistent with the expected background of 0.13 ± 0.03 events and with the predicted standard model ZZ and Z[gamma]* production of 1.71 ± 0.15 events. They set an upper limit on the ZZ and Z[gamma]* cross section of 4.4 pb at the 95% C.L. They also derive limits on anomalous neutral trilinear ZZZ and ZZ[gamma]* gauge couplings. The one-parameter 95% C.L. coupling limits with a form factor scale [Lambda] = 1.2 TeV are -0.28
Forward Backward Asymmetry In Lambda B Production And Search For The Xi B And Omega B Baryons In P Bar P Collisions At Sqrt S
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language : en
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Release Date : 2015
Forward Backward Asymmetry In Lambda B Production And Search For The Xi B And Omega B Baryons 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 2015 with categories.
We present a search for the heavy-flavor baryons $\Xi_{b}$ (bsd) and $\Omega^{-}_{b}$ in decays $\Xi^{-}_{b}$→ J/[psi]$\Xi^{-}_{b}$ → J/[psi][Lambda][pi]-, J/[psi] → [mu]+ [mu]- and $\Omega^{-}_{b}$ → J/[psi]$\Omega^{-}_{b}$ J/[psi][Lambda] $K^{-}_{b}$, J/[psi] → [mu]+ [mu]- respectively.
Measurement Of The Ttbar Production Cross Section In Ppbar Collisions At Sqrt S
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Author :
language : en
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Release Date : 2010
Measurement Of The Ttbar Production Cross Section 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 a measurement of the top quark pair production cross section in p{bar p} collisions at √s = 1.96 TeV using a data sample corresponding to 1.7 fb−1 of integrated luminosity collected with the Collider Detector at Fermilab. We reconstruct t{bar t} events in the lepton+jets channel, consisting of e[nu]+jets and [mu][nu]+jets final states. The dominant background is the production of W bosons in association with multiple jets. To suppress this background, we identify electrons from the semileptonic decay of heavy-flavor jets ('soft electron tags'). From a sample of 2196 candidate events, we obtain 120 tagged events with a background expectation of 51 ± 3 events, corresponding to a cross section of [sigma]{sub t{bar t}} = 7.8 ± 2.4 (stat) ± 1.6 (syst) ± 0.5 (lumi) pb. We assume a top-quark mass of 175 GeV/c2. This is the first measurement of the t{bar t} cross section with soft electron tags in Run II of the Tevatron.
Measurement Of The Top Pair Production Cross Section In The Dilepton Decay Channel In Ppbar Collisions At Sqrt S
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language : en
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Release Date : 2010
Measurement Of The Top Pair Production Cross Section In The Dilepton Decay Channel 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.
A measurement of the t{bar t} production cross section in p{bar p} collisions at √s = 1.96 TeV using events with two leptons, missing transverse energy, and jets is reported. The data were collected with the CDF II Detector. The result in a data sample corresponding to an integrated luminosity 2.8 fb−1 is: [sigma]{sub t{bar t}} = 6.27 ± 0.739(stat) ± 0.63(syst) ± 0.39(lum) pb for an assumed top mass of 175 GeV/c2.
Measurement Of The T Bar T Production Cross Section In Pp Collisions At Sqrt S
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language : en
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Release Date : 2014
Measurement Of The T Bar T Production Cross Section 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 2014 with categories.
The top-quark pair production cross section is measured in final states with one electron or muon and one hadronically decaying [tau] lepton from the process $t\bar{t}$ to (l[nu]l) ([tau][nu][tau]) $b\bar{b}$, where l = e, [mu]. The data sample corresponds to an integrated luminosity of 19.6 fb-1 collected with the CMS detector in proton-proton collisions at $\sqrt{s}$ =8 TeV. The measured cross section [sigma]$t\bar{t}$ = 257 ± 3 (stat) ± 24 (syst) ± 7 (lumi) pb, assuming a top-quark mass of 172.5 GeV, is consistent with the standard model prediction.
Measurement Of Correlated B Bbar Production In P Pbar Collisions At S 1 2
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language : en
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Release Date : 2007
Measurement Of Correlated B Bbar Production In P Pbar Collisions At S 1 2 written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with categories.
We present a measurement of the correlated b{bar b} production cross section. The data used in this analysis were taken with the upgraded CDF detector (CDF II) at the Fermilab Tevatron collider, and correspond to an integrated luminosity of 742 pb−1. We utilize muon pairs with invariant mass 5 ≤ m{sub [mu][mu]} ≤ 80 GeV/c2 produced by b{bar b} double semileptonic decays. For muons with p{sub T} ≥ 3 GeV/c and.
Search For P Bar P Rightarrow Wz Rightarrow L Nu L B Bar B Signal With The Cdf Experiment At Tevatron
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Author :
language : en
Publisher:
Release Date : 2010
Search For P Bar P Rightarrow Wz Rightarrow L Nu L B Bar B Signal With The Cdf Experiment At Tevatron 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.
The high energy physics has made huge steps forward the comprehension of the inner most nature of our universe and the matter we are composed of. The experimental discoveries, and the theories of the last 50 years that the experimental discoveries had confirmed or inspired, made possible to build a theory of the interactions. Weak interactions have been discovered and unified with the Electromagnetic ones in the Standard Model, which is the most widely experimentally tested and confirmed model of this century. The only prediction which is still unconfirmed is the existence of a particle, the Higgs boson, which provides particles with mass, interacting with them, in a spontaneous symmetry breakdown that doesn't violate the natural gauge symmetry of the Lagrangian of the system. One of the ways in which the Standard Model has been tested during the last 20 years is by accelerating ee− (LEP) or p{bar p} (Tevatron) particles in a circular ring and colliding them inside a detector which is designed to reveal the final reaction products. We now have two operating hadron colliders in the world. The Tevatron at Fermilab laboratory of Chicago, collides protons against anti-protons since 1989 and has reached its maximum energy in the mass center of 1.96 TeV since 2001. It has collected approximately 7 fb−1 of data so far, that allowed important discoveries, as the top quark one, B{sub s} mixing, precision measurements of some of the Standard Model free parameters, e.g. the W mass, and search for New Phenomena. The LHC at CERN in Geneva is a proton proton collider and has started the data acquisition in March 2010, at a center of mass energy of 7 TeV, thus beating the world record of the Tevatron. LHC however has not yet either the integrated luminosity nor the detailed understanding of the detectors to start investigating Higgs or di-boson production. The purpose of this work is to analyse the data of the CDF experiment at Tevatron to search for the associate production of a W{sup {+-}} and Z gauge boson, looking for them in the lepton, neutrino plus jets final state, This process is predicted by the Standard Model but not revealed yet in this particular channel, both for its small cross section ([sigma]{sub WW/WZ} H"16 pb−1) and for the huge backgrounds we have to deal with. The WW− or W{sup {+-}}Z in l {bar {nu}}{sub l} j j process has been measured for the first time in [4] and represents the starting point of this work. Our aim is to discriminate W{sup {+-}}Z process from W+W− one requiring the decay of the Z boson in two b-quarks. The evidence of a peak on the invariant mass distribution will allow a tuning of the invariant mass resolution of b-jets. In addition, one of the main motivations for this quest is the similarity of this exactly predicted process with the W{sup {+-}}H associate production signature, for which it represents a test of the searching tools and techniques, as long as an irreducible background that must be understood before such Higgs search is performed.