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Search For A Higgs Boson In W H L Nu B Anti B In P Anti P Collisions At Su
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Book Synopsis Search for a Higgs Boson in W H --] L Nu B Anti-b in P Anti-p Collisions at S**1/2 by :
Download or read book Search for a Higgs Boson in W H --] L Nu B Anti-b in P Anti-p Collisions at S**1/2 written by and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We present a search for a standard model Higgs boson produced in association with a W boson using 2.7 fb−1 of integrated luminosity of p{bar p} collision data taken at √s = 1.96 TeV. Limits on the Higgs boson production rate are obtained for masses between 100 GeV/c2 and 150 GeV/c2. Through the use of multivariate techniques, the analysis achieves an observed (expected) 95% confidence level upper limit of 5.6 (4.8) times the theoretically expected production cross section for a standard model Higgs boson with a mass of 115 GeV/c2.
Book Synopsis Search for a Higgs Boson in W H --] L Nu B Anti-b in P Anti-p Collisions at S**ư by :
Download or read book Search for a Higgs Boson in W H --] L Nu B Anti-b in P Anti-p Collisions at S**ư written by and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We present a search for a standard model Higgs boson produced in association with a W boson using 2.7 fb−1 of integrated luminosity of p{bar p} collision data taken at √s = 1.96 TeV. Limits on the Higgs boson production rate are obtained for masses between 100 GeV/c2 and 150 GeV/c2. Through the use of multivariate techniques, the analysis achieves an observed (expected) 95% confidence level upper limit of 5.6 (4.8) times the theoretically expected production cross section for a standard model Higgs boson with a mass of 115 GeV/c2.
Book Synopsis Search for H ---] B Anti-b Produced in Association with W Bosons in P Anti-p Collisions at S**ư by :
Download or read book Search for H ---] B Anti-b Produced in Association with W Bosons in P Anti-p Collisions at S**ư written by and published by . This book was released on 2005 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors present a search for the standard model Higgs boson decaying into b{bar b} and produced in association with W bosons in p{bar p} collisions at √s = 1.96 TeV. This search uses 320 pb−1 of the dataset accumulated by the upgraded Collider Detector at Fermilab. Events are selected that have a high-transverse momentum electron or muon, missing transverse energy, and two jets, at least one of which is consistent with the hadronization of a b quark. Both the number of events and the dijet mass distribution are consistent with standard model background expectations, and they set 95% confidence level upper limits on the production cross section times branching ratio for the Higgs boson or any new particle with similar decay kinematics. These upper limits range from 10 pb for m{sub H} = 110 GeV/c2 to 3 pb for m{sub H} = 150 GeV/c2.
Book Synopsis Search for H ---] B Anti-b Produced in Association with W Bosons in P Anti-p Collisions at S**1/2 by :
Download or read book Search for H ---] B Anti-b Produced in Association with W Bosons in P Anti-p Collisions at S**1/2 written by and published by . This book was released on 2005 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors present a search for the standard model Higgs boson decaying into b{bar b} and produced in association with W bosons in p{bar p} collisions at √s = 1.96 TeV. This search uses 320 pb−1 of the dataset accumulated by the upgraded Collider Detector at Fermilab. Events are selected that have a high-transverse momentum electron or muon, missing transverse energy, and two jets, at least one of which is consistent with the hadronization of a b quark. Both the number of events and the dijet mass distribution are consistent with standard model background expectations, and they set 95% confidence level upper limits on the production cross section times branching ratio for the Higgs boson or any new particle with similar decay kinematics. These upper limits range from 10 pb for m{sub H} = 110 GeV/c2 to 3 pb for m{sub H} = 150 GeV/c2.
Book Synopsis Search for Higgs Bosons Decaying Into B Anti-b and Produced in Association with a Vector Boson in P Anti-p Collisions at 1.8-TeV. by :
Download or read book Search for Higgs Bosons Decaying Into B Anti-b and Produced in Association with a Vector Boson in P Anti-p Collisions at 1.8-TeV. written by and published by . This book was released on 2005 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors present a new search for H°V production, where H° is a scalar Higgs boson decaying into b{bar b} with branching ratio?, and V is a Z° boson decaying into ee−,?+?−, or?{bar {nu}}. This search is then combined with previous searches for H°V where V is a W{sup ±} boson or a hadronically decaying Z°. The data sample consists of 106 {+-} 4 pb−1 or p{bar p} collisions at √s = 1.8 TeV accumulated by the Collider Detector at Fermilab. Observing no evidence of a signal, they set 95% Bayesian credibility level upper limits on?(p{bar p} → H°V) x?. For H° masses of 90, 110 and 130 GeV/c2, the limits are 7.8, 7.2, and 6.6 pb respectively.
Book Synopsis Search for the Higgs Boson in H ---] WW(*) Decays in P Anti-p Collisions at S**ư by :
Download or read book Search for the Higgs Boson in H ---] WW(*) Decays in P Anti-p Collisions at S**ư written by and published by . This book was released on 2005 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present a search for the standard model Higgs boson in H → WW{sup (*)} decays with ee−, e{sup {+-}}?{sup {-+}} and?+?− final states in p{bar p} collisions at a center-of-mass energy of √s = 1.96 TeV. The data, collected from April 2002 to June 2004 with the D0 detector, correspond to an integrated luminosity of 300-325 pb−1, depending on the final state. The number of events observed is consistent with the expectation from backgrounds. Limits from the combination of all three channels on the Higgs production cross section times branching ratio? x BR(H → WW{sup (*)}) are presented.
Book Synopsis Search for Associated Higgs Boson Production WH ---] WWW* ---] L+- Nu L-prime+- Nu-prime + X in P Anti-p Collisions at S**1/2 by :
Download or read book Search for Associated Higgs Boson Production WH ---] WWW* ---] L+- Nu L-prime+- Nu-prime + X in P Anti-p Collisions at S**1/2 written by and published by . This book was released on 2006 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Search for the Standard Model Higgs Boson in P Anti-p Interactions with the Decay Mode H --] W+W- --] Mu+nu Mu-anti-nu at the D0 Experiment by :
Download or read book Search for the Standard Model Higgs Boson in P Anti-p Interactions with the Decay Mode H --] W+W- --] Mu+nu Mu-anti-nu at the D0 Experiment written by and published by . This book was released on 2010 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt: A search for the standard model Higgs boson in p{bar p} collisions resulting in two muons and large missing transverse energy is presented. The analysis uses 4.2 fb−1 of integrated luminosity at a center-of-mass energy of √s = 1.96 TeV collected between April 2002 and December 2008 with the D0 detector at the Fermilab Tevatron collider. No significant excess above the background estimation is observed and limits are derived on Higgs boson production.
Book Synopsis A Search for Long-Lived Doubly-Charged Higgs Boson Production in Anti-p P Collisions at Sqrt(s) by : Joshua P. Tuttle
Download or read book A Search for Long-Lived Doubly-Charged Higgs Boson Production in Anti-p P Collisions at Sqrt(s) written by Joshua P. Tuttle and published by . This book was released on 2005 with total page 101 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present a search for a quasi-stable doubly-charged Higgs particle at CDF using the Fermilab Tevatron for √s = 1.96 TeV. The data presented are from approximately 290 pb−1 of integrated luminosity collected using the upgraded Run 2 Collider Detector at Fermilab. These data were taken between February, 2002 and February, 2004. The long-lived decay products of Z's are selected in the central detector region (
Book Synopsis Search for the Higgs Boson and Technicolor Particles in P Anti-p Colisions at Sqrt(s) by :
Download or read book Search for the Higgs Boson and Technicolor Particles in P Anti-p Colisions at Sqrt(s) written by and published by . This book was released on 1999 with total page 252 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the Standard Model (SM) of the elementary particles, the interactions among the known fundamental fermions (leptons and quarks) are mediated through gauge bosons which obey the symmetry: SU(3) {circle_times} SU(2) {circle_times} U(1). More precisely, the electroweak interaction [4-6] is described by a gauge symmetry SU(2) {circle_times} U(1) which is broken spontaneously. The electroweak symmetry breaking is implemented by the introduction of a complex scalar Higgs field which has a non-zero vacuum expectation value (vev). This way, the lagrangian of the theory remains invariant under SU(2) transformations, but quantization of the fields must start from a ground state which does not exhibit this symmetry, and therefore the full symmetry of the lagrangian is not manifest. Invariance of the theory under local SU(2) transformations implies the presence of vectorial gauge fields which mediate the electroweak interactions. The so called spontaneous symmetry breaking allows the quanta of these gauge fields, the W and Z bosons, to acquire a finite mass. The photon, the particle which mediates the electromagnetic interaction, remains massless. The Higgs boson is one of only two particles in the SM which have not yet been directly observed (the other is the [nu]{sub {tau}}, although there is indirect evidence of its existence). Although the SM does not predict the Higgs mass, a lower limit ≈ 100 GeV/c2 is set by LEPII data, and theoretical considerations prefer Higgs masses not higher than a few hundred GeV/c2. At the Tevatron, a search for the Higgs boson is hard due to the small production cross section and the huge backgrounds that do not allow to see the signal clearly. It is still interesting, however, to perform sensitivity studies at the Tevatron. The easiest production channel to observe at the Tevatron is the associated production of Higgs with weak (W or Z) bosons. The Higgs boson coupling to the fermions increases with fermion mass, so the most likely decay in the mass range they are interested, M(H°) ≈ 100 GeV/c2, in is H → b{bar b}. There are different possible final states depending on the decay of the associated vector boson: two jets plus lepton plus missing transverse energy (leptonic channel) and four jets (hadronic channel). In the former, the presence of a highly energetic, isolated lepton makes it relatively easy to reduce the background, while the latter has a larger production cross section times branching fraction, but it also has a huge amount of irreducible QCD background. CDF has searched for the Higgs boson in both final states, setting upper limits on the production cross sections.
Book Synopsis A Search for the Higgs Boson in Its Associated Production with a W Vector Boson in P Anti-p Collisions at {u221A}s by :
Download or read book A Search for the Higgs Boson in Its Associated Production with a W Vector Boson in P Anti-p Collisions at {u221A}s written by and published by . This book was released on 2007 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present the results of a search for the Standard Model Higgs boson in its associated production with a W vector boson in p$ar{p}$ collisions at √s = 1.96 TeV using the complete Run IIA dataset with an integrated luminosity of 1.04 fb-1 collected by the D0 experiment. The salient features of this analysis are the extended geometric acceptance by including the pseudorapidity covered by the end cap calorimeter, optimization in b-tagging and event selection criteria. We observe very good agreement in the data compared to the expectation form the modeling of Standard Model background for the WH signal. No excess events in data are observed over the predicted background. We establish that the evidence for observing the Higgs boson in this channel is inconclusive and proceed to set upper cross section limits on the associated WH production at 95% confidence level. We derive the cross section upper limits for the Higgs mass (mH) ranging from 105 GeV/c2 to 145 GeV/c2. For mH = 115 GeV/c2, the observed (expected) upper limit is 0.8 (0.9) pb compared to the Standard Model expectation of 0.13 pb.
Book Synopsis A Search for the Higgs Boson in Its Associated Production with a W Vector Boson in P Anti-p Collisions at S**1/2 by :
Download or read book A Search for the Higgs Boson in Its Associated Production with a W Vector Boson in P Anti-p Collisions at S**1/2 written by and published by . This book was released on 2007 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present the results of a search for the Standard Model Higgs boson in its associated production with a W vector boson in p{bar p} collisions at √s = 1.96 TeV using the complete Run IIA dataset with an integrated luminosity of 1.04 fb−1 collected by the D0 experiment. The salient features of this analysis are the extended geometric acceptance by including the pseudorapidity covered by the end cap calorimeter, optimization in b-tagging and event selection criteria. We observe very good agreement in the data compared to the expectation form the modeling of Standard Model background for the WH signal. No excess events in data are observed over the predicted background. We establish that the evidence for observing the Higgs boson in this channel is inconclusive and proceed to set upper cross section limits on the associated WH production at 95% confidence level. We derive the cross section upper limits for the Higgs mass (m{sub H}) ranging from 105 GeV/c2 to 145 GeV/c2. For m{sub H} = 115 GeV/c2, the observed (expected) upper limit is 0.8 (0.9) pb compared to the Standard Model expectation of 0.13 pb.
Book Synopsis A Beauty-ful Boson by : Giulia Di Gregorio
Download or read book A Beauty-ful Boson written by Giulia Di Gregorio and published by Springer Nature. This book was released on 2023-01-01 with total page 229 pages. Available in PDF, EPUB and Kindle. Book excerpt: The analysis described in this thesis is the search for the Higgs boson, decaying into bb pair, in the associated production with a vector boson, in the extreme Higgs boson transverse momentum region where the Higgs boson is reconstructed using the large-R jet technique. The use of the large-R jets allows to add a part of the phase space unexplored so far, which is particularly sensitive to possible new physics. The analysed data have been collected at LHC by the ATLAS detector between 2015 and 2018 at a centre-of-mass energy of √s = 13 TeV. The same dataset has been used to perform the differential pp → ZH and pp → WH cross-section measurements used to extract the information on the Higgs couplings and to put limits on Beyond the Standard Model effects. Furthermore the analysis has been re-used to perform a cross-section measurement of the diboson ZZ and WZ processes because the diboson and the Higgs processes have a similar topology. For the first time the ZZ(bb) and WZ(bb) cross-sections are measured at √s = 13 TeV and the observed cross-section measurements are consistent with the Standard Model predictions.
Book Synopsis Search for the Higgs Boson in the Vector Boson Fusion Channel at the ATLAS Detector by : Eric Ouellette
Download or read book Search for the Higgs Boson in the Vector Boson Fusion Channel at the ATLAS Detector written by Eric Ouellette and published by Springer. This book was released on 2015-01-20 with total page 114 pages. Available in PDF, EPUB and Kindle. Book excerpt: This Thesis describes the first measurement of, and constraints on, Higgs boson production in the vector boson fusion mode, where the Higgs decays to b quarks (the most common decay channel), at the LHC. The vector boson fusion mode, in which the Higgs is produced simultaneously with a pair of quark jets, provides an unparalleled opportunity to study the detailed properties of the Higgs, including the possibility of parity and CP violation, as well as its couplings and mass. It thus opens up this new field of study for precision investigation as the LHC increases in energy and intensity, leading the way to this new and exciting arena of precision Higgs research.
Book Synopsis Search for Resonant Pair Production of Long-lived Particles Decaying to B Anti-b in P Anti-p Collisions at S**ư by :
Download or read book Search for Resonant Pair Production of Long-lived Particles Decaying to B Anti-b in P Anti-p Collisions at S**ư written by and published by . This book was released on 2009 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: We report on a first search for production of Higgs bosons decaying into neutral long-lived particles (NLLP) which each decay to a b{bar b} pair, using 3.6 fb−1 of data recorded with the D0 detector at the Fermilab Tevatron collider. We search for pairs of displaced vertices in the tracking detector at radii in the range 1.6-20 cm from the beam axis. No significant excess is observed above background, and upper limits are set on the production rate in a hidden-valley benchmark model for a range of Higgs boson masses and NLLP masses and lifetimes.
Book Synopsis D0 Search for the Higgs Boson in Multijet Events by : Alex Melnitchouk
Download or read book D0 Search for the Higgs Boson in Multijet Events written by Alex Melnitchouk and published by . This book was released on 2006 with total page 3 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present two searches for the Higgs boson in {radical}s = 1.96 TeV p{bar p} collisions using data taken with the D0 detector during Run II of the Fermilab Tevatron collider. The first study is a search for neutral Higgs bosons produced in association with bottom quarks. The cross sections for these processes are enhanced in many extensions of the standard model (SM), such as in its minimal supersymmetric extension at large tan {beta}. The results of our analysis agree with expectations from the SM, and we use our measurements to set upper limits on the production of neutral Higgs bosons in the mass range of 90 to 150 GeV. The second study is a search for the standard model Higgs boson produced in association with the Z boson. We study the p{bar p} {yields} ZH {yields} {nu}{bar {nu}}b{bar b} channel, which is one of the most sensitive ways to search for light Higgs bosons at the Tevatron. We select multijet events with large imbalance in transverse momentum and two b-tagged jets. Then we search for a peak in invariant mass distribution of two b-tagged jets. After subtracting the backgrounds, we set the 95% C.L. upper limits on the {sigma}(p{bar p} {yields} ZH {yields} {nu}{bar {nu}}) x BR(H {yields} b{bar b}) for Higgs masses between 105 and 135 GeV.
Book Synopsis The Beauty and the Boost: A Higgs Boson Tale by : Brian Moser
Download or read book The Beauty and the Boost: A Higgs Boson Tale written by Brian Moser and published by Springer Nature. This book was released on 2023-09-19 with total page 250 pages. Available in PDF, EPUB and Kindle. Book excerpt: Precision measurements of the Higgs boson’s properties are a powerful tool to look for deviations from the predictions of the Standard Model (SM) of particle physics. The 139/fb of proton-proton collision data which have been collected by the ATLAS experiment during Run 2 of the LHC, offer an opportunity to investigate rare Higgs-boson topologies, which are particularly sensitive to new physics scenarios but experimentally difficult to access. Several such measurements, which target Higgs-boson decays to heavy-flavour quarks, as well as their combinations are presented in this thesis. A novel analysis that measures Higgs-boson production in association with a heavy vector boson V (VH, with V=W,Z) at high energies is presented. Dedicated Higgs-boson reconstruction techniques are applied to reconstruct the highly Lorentz-boosted Higgs-boson decays into pairs of bottom quarks. The measurement is subsequently combined with a VH cross-section measurement at low and intermediate pT(V) to provide a differential cross-section measurement in kinematic fiducial volumes over the largest possible pT(V) range. All cross-section measurements agree with the SM predictions within relative uncertainties that range from 30% to 300%. The results are furthermore interpreted as limits on the parameters of a SM effective field theory. Finally, a combination of measurements of Higgs decays to heavy-flavour quarks is used to experimentally determine that the Higgs-boson coupling to charm quarks is weaker than to bottom quarks, as predicted by the SM. The target audience for the thesis are physicists and physics students, in particular those with a background in high energy physics.
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