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It is shown that this decay provides an additional possibility for charged Higgs searches. From our measurements of the angular parameters we conclude that there is no evidence for a deviation from flavor SU( 3) symmetry for these decays and that the factorization assumption is not valid for the B-d(0) --> J/psi K*(0) decay.

TABLE XX: A summary table of the systematic uncertainties on the acceptances.

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Read reviews from worlds largest community for readers. The NNLO corrections In particular, it is possible to directly determine the branching ratio (W+b) / (W+q (q = b,s,d)). Correlations are taken into account in the calculation of the limit. Abstract We present numerical calculations of the partial width of the charged Higgs boson decay into a top quark, H $$ \\overline{t} $$ t + b + X, and the partial width of the top quark decay into a light charged Higgs boson t H+ + b + X at next-to-next-to-leading order (NNLO) in QCD, based on a factorization formula of the jet mass. 1: The distributions of cos() for three fractions of longitudinally polarized Z-bosons: 65% (solid

Varduhi Hakobyan. Full PDF Package Download Full PDF Package. A Limit on the Branching Ratio of the Flavor-Changing Top quark decay tZc Alexander Paramonov, Henry Frisch, Carla Pilcher, Collin Wolfe, Dan Krop CDF Collaboration Meeting. Top production and branching ratios For D collaboration Elizaveta Shabalina University of Illinois at Chicago Wine and Cheese seminar at FNAL 09/16/05 Outline Introduction 4 , (4) where +and are the angles of the daughters in the top- quark rest frame with respect to a particular spin quantization axis, is a very sensitive observable. The best current determination of this ratio is 0.99+0.09

The top quark is the latest quark of the Standard Model (SM) that was discovered, discovery that was made in 1995 by the CDF and D0 collaborations [1]. The indirect determination of $$\\Gamma _W$$ W via the cross-section OSTI.GOV Thesis/Dissertation: A Limit on the Branching Ratio of the Flavor-Changing Top Quark Decay TZc.

The first is the relevant coupling constants. Combined analyses of the Higgs boson production and decay rates as well as its coupling strengths to vector bosons and fermions are presented. Measurements of the branching ratios of top quark decays into leptons and jets using events with tt (top antitop) pairs are reported. The calculation of the rare t-quark decay t b b bW within the Standard Model as well as the charged Higgs contribution to this decay is presented. The decay widths are: We have used the Collider Detector at Fermilab (CDF-II) to set upper limits on the branching ratio of the flavor-changing neutral-current (FCNC) top quark decay t {yields} Zc using a technique employing ratios of W and Z production, measured in 1.52 fb{sup -1} of p{bar p} data. from publication: Flavor changing neutral decay effects cos. Download Table | 1: Rare FCNC branching ratios of the top quark and the Higgs boson decays. The top quark branching fraction ratio R b and the inclusive production cross section tt are measured in the dilepton channel using 4.6 fb-1 of proton-proton collisions at the centre-of-mass energy s = 7 TeV collected with the ATLAS detector at the Large Hadron Collider at CERN. Whilenegligibleatthe Tevatron, at LHC energies the Wt-associated production becomes relevant. tb close to unity, the decay width of the top quark is expected to be dominated by the two-body channel t Wb. A Limit on the Branching Ratio of the Flavor-Changing Top quark decay t Zc PowerPoint Presentation Read reviews from worlds largest community for readers. The calculation of the rare t-quark decay t b b bW within the Standard Model as well as the charged Higgs contribution to this decay is presented. [12] In the Standard Model, the Higgs particle is a massive scalar boson with zero spin, even (positive) parity, no electric charge, and no colour Search terms: Advanced search options. Top Quark NNLO approximated calculations yield 1.03+0.05 0.05 pb for the Tevatron, and 4.5 +0.2 0.2 (5.5 +0.2 0.2) pb for s= 7 (8) TeV attheLHC,with69%(31%)oftop(anti-top)quarks[9]. The current world average value is based on direct measurements of final state kinematic properties of W-boson decays, and has a relative uncertainty of 2%. Download Download PDF. PACS: 12.38.-t, 14.54Ha cos.

Template fits to the distribution of the number of b-tagged jets find R b = 1.02 0.01 Full PDF Package Download Full PDF Package. The nal weak isospin doublet pair (tb) is not allowed as the mass of the top quark is too large! For instance, the T;B doublet VLQ-T can only decay into tZ or tH, with a branching fraction BRT th BRT tZ 50% for a large VLQ- Tmass; thus, the cross section Br th should be approximately equal to the cross section A short summary of this paper. A.

The electroweak coupling g of the W is the same for leptons and quarks, but for the quarks we have to include the colour factor of 3. The portrait of the Higgs boson is defined by its production modes, via cross-sections, and its decay channels, via branching fractions. The abbreviation lept. stands for the systematic uncertainty due to lepton ID. Branching ratio calculations for Bs0 + is the branching ratio (BR) of the decay Bs0 + . Combined analyses of the Higgs boson production and decay rates as well as its coupling strengths to vector bosons and fermions are presented. Physical Review Letters, 1995. Top quark branching ratio In the standard model the top decays to Wb with a branching fraction > 0.998 at 90% C.L., constrained by the unitarity of the three-generation CKM matrix. between their decay branch ratios, whether for singlet or doublet VLQ-T quarks. The collected data sample corresponds to an integrated luminosity of 4.6 fb-1. We have used the Collider Detector at Fermilab (CDF-II) to set upper limits on the branching ratio of the flavor-changing neutral-current (FCNC) top quark decay t {yields} Zc using a technique employing ratios of W and Z production, measured in 1.52 fb{sup -1} of p{bar p} data. The stronger the coupling constant, the Download Download PDF. The role of possible background processes is discussed. Varduhi Hakobyan. This note collects a sum- Homework Statement Hi, I need to get an estimate of the branching ratios of the processes [/B] t ---> b + W ---> b + c anti-s t ---> b + W ---> b + anti-tau nu(tau) without doing the calculations, just a qualitative estimation. The role of possible background processes is discussed. precision on top quark properties measurements (i.e., during the LHC era) will require creativity and dedicated study to reduce the systematic uncertainties.

They found a slight excess of data above the expected Standard Model background, with a significance of 2.3 sigma, and set limits on the branching ratio for top-quark decay via FCNC interactions (see Figure 3), as well as on the effective coupling constants for FCNC interactions between the top quark and the Higgs boson. 37 Full PDFs related to this paper. The analysis uses a comparison of two decay chains, p{bar p} {yields} t{bar t} {yields} WbWb {yields} Neglecting terms of order m2 b /m 2 t, 2s,and( s/)M2 W /m 2,the width predicted in the Standard Model (SM) at next-to-leading-order is [6]: t= G Fm3t 8 2 1 M2 W m2 t 2 1+2 M2 W m2 t 1 2 s 3 22 5 2, (1) where m t refers to the top quark pole mass. This decay channel has the largest branching ratio but also suers from the largest background coming from multijet events. Search terms: Advanced search options. Answer (1 of 2): Short answer: because the Z bosons are further off-shell than the W bosons. author = "{ATLAS Collaboration} and Paul Newman and Philip Allport and {Aperio Bella}, Ludovica and Matthew Baca and Juraj Bracinik and David Charlton and Andrew Chisholm and Andrew Daniells and Grzegorz Gach and Christopher Hawkes and Simon Head and Stephen Hillier and Mark Levy and Richard Mudd and {Murillo Quijada}, Javier and Konstantinos Nikolopoulos and We have used the Collider Detector at Fermilab (CDF-II) to set upper limits on the branching ratio of the flavor-changing neutral-current (FCNC) top quark decay t {yields} Zc using a technique employing ratios of W and Z production, measured in 1.52 fb{sup -1} of p{bar p} data. Paperity: the 1st multidisciplinary aggregator of Open Access journals & papers. Im thinking maybe there are some assumptions that are taken to derive the branching ratios that include assuming the energy level of these bosons thereby excluding the top quark from the branching ratios.

The lepton+jets channel occurs 30% author = "{ATLAS Collaboration} and Paul Newman and Philip Allport and {Aperio Bella}, Ludovica and Matthew Baca and Juraj Bracinik and David Charlton and Andrew Chisholm and Andrew Daniells and Grzegorz Gach and Christopher Hawkes and Simon Head and Stephen Hillier and Mark Levy and Richard Mudd and {Murillo Quijada}, Javier and Konstantinos Nikolopoulos and Strong constraints on these theoretical scenarios can be derived from light fermion phenomenology and from B-mesons studies. U.S. Department of Energy Office of Scientific and Technical Information. A limit on the branching ratio of the flavor-changing top quark decay t Zc. A limit on the branching ratio of the flavor-changing top quark decay t Zc. This can happen in several ways (called channels): either an intermediate W-boson decays into a top and antibottom quark ("s-channel") or a bottom quark (probably created in a pair through the decay of a gluon) transforms to a top quark by exchanging a W-boson with an up or down quark ("t-channel"). Observation of the top quark. Measurements of the top quark branching ratios into channels with leptons and quarks with the ATLAS detector G. Aad et al. (b) What the branching ratios for leptons (W ) and hadrons (W qq)? New family dependent fermionic interactions have been conjectured in several extensions of the Standard Model that range from Supersymmetry to composite theory up to flavor interactions.

New family dependent fermionic interactions have been conjectured in several extensions of the Standard Model that range from Supersymmetry to composite theory up to flavor interactions. Corresponding constrains on the top quark 37 Full PDFs related to this paper. The top quark interacts with gluons of the strong interaction and is typically produced in hadron colliders via this interaction. However, once produced, the top (or antitop) can decay only through the weak force. It decays to a W boson and either a bottom quark (most frequently), a strange quark, or, on the rarest of occasions, a down quark . The combinations include the results of the analyses of the [Formula: see text] and [Formula: see text] - "A Limit on the Branching For instance, the T;B doublet VLQ-T can only decay into tZ or tH, with a branching fraction BRT th BRT tZ 50% for a large VLQ- Tmass; thus, the cross section Br th should be approximately equal to the cross section

This Paper. This provides physicists with the unique opportunity to study the behavior of a "bare" quark. A Limit on the Branching Ratio of the Flavor-Changing Top Quark Decay TZc. Combination of t(t)over-bar cross section measurements and constraints on the mass of the top quark and its decays into charged Higgs bosons; 2009; Ingr i: Physical Review D. - 1550-7998 .- 1550-2368. ; 80, s. 071102- Tidskriftsartikel (refereegranskat) abstract The analysis uses a comparison of two decay chains, p{bar p} {yields} t{bar t} {yields} WbWb {yields} This Paper. As a result top quarks do not have time to form hadrons before they decay, as other quarks do. Search terms: Advanced search options. U.S. Department of Energy Office of Scientific and Technical Information. Multiple tools have been developed to calculate this BR. U.S. Department of Energy Office of Scientific and Technical Information. Download scientific diagram | Branching ratios of the singlet top quark partner decay. Corresponding constrains on the top quark * (ATLAS Collaboration) (Received 17 June 2015; published The left-right asymmetry is much smaller than that of tWb decay. It is shown that this decay provides an additional possibility for charged Higgs searches. The absence of a hadron surrounding the top quark provides physicists with the unique opportunity to study the behavior of a "bare" quark. In particular, it is possible to directly determine the branching ratio (W+b) / (W+q | q = b, s, d). The combinations include the results of the analyses of the [Formula: see text] and [Formula: see text] Full Record; Other Related Research; 3. from publication: Single production of vector-like top partners in trilepton channel at Free fulltext PDF articles from hundreds of disciplines, all in one place Introduction: The top quark is the Q=2=3, T 3 =+1=2 member of the weak-isospin doublet containing the bottom quark (see our review on the \Standard Model of Electroweak Interactions" for more information). Download scientific diagram | Branching ratio of the top quark decay into a charged Higgs boson and a bottom quark, with the successive decay of the * (ATLAS Collaboration) (Received 17 June 2015; published

Enter the email address you signed up with and we'll email you a reset link. The portrait of the Higgs boson is defined by its production modes, via cross-sections, and its decay channels, via branching fractions. The Higgs boson, sometimes called the Higgs particle,[9][10] is an elementary particle in the Standard Model of particle physics produced by the quantum excitation of the Higgs field,[11][12] one of the fields in particle physics theory. between their decay branch ratios, whether for singlet or doublet VLQ-T quarks. A Limit on the Branching Ratio of the Flavor-Changing Top quark decay tZc Alexander Paramonov, Henry Frisch, Carla Pilcher, Collin At Strong constraints on these theoretical scenarios can be derived from light fermion phenomenology and from B-mesons studies. book. THE TOP QUARK Revised April 1998 by M. Mangano (CERN) and T. Trippe (LBNL). Measurements of the top quark branching ratios into channels with leptons and quarks with the ATLAS detector G. Aad et al. However, it turns out that, A single quark can not exist as a free particle, because free particles turn out to be color neutral. A Limit on the Branching Ratio of the Flavor-Changing Top quark decay tZc Alexander

Long answer: there are basically two factors that determine the strength of a decay. PACS: 12.38.-t, 14.54Ha A short summary of this paper. Events were recorded with the ATLAS detector at the LHC in pp collisions at a center-of-mass energy of 7 TeV. - "A Limit on the Branching Ratio of the Flavor-Changing Top Quark Decay TZc" FIG. Physical Review Letters, 1995.

Observation of the top quark. 4 , (72.4) where +and are the angles of the daughters in the top-quark rest frame with respect to a particular spin quantization axis (assumed here to be the same for +and ), is a. December 1, 2017 09:36. book. The analyses are based on approximately 2.8 fb(-1) of data recorded with the D0 detector. The total W-boson decay width $$\\Gamma _W$$ W is an important observable which allows testing of the standard model. Single top quarks. This can happen in several ways (called channels): either an intermediate W-boson decays into a top and antibottom quark ("s-channel") or a bottom quark (probably created in a pair through the decay of a gluon) transforms to a top quark by exchanging a W-boson with an up or down quark ("t-channel").

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