Search for a Low-mass Higgs Boson in Y(3S)--] Gamma A0̂, A0̂--] Tau ̂tau-̂ at BABAR. PDF Download
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Author: Publisher: ISBN: Category : Languages : en Pages : 7
Book Description
We search for a light Higgs boson A° in the radiative decay Y(3S) →?A°, A° → TT−, T+ → e+?{sub e}?{sub T}, or T+ →?+?{sub {mu}T}. The data sample contains 122 x 106 Y(3S) events recorded with the BABAR detector. We find no evidence for a narrow structure in the studied T+T− invariant mass region of 4.03 m{sub T+T−}
Author: Publisher: ISBN: Category : Languages : en Pages : 7
Book Description
We search for a light Higgs boson A° in the radiative decay Y(3S) →?A°, A° → TT−, T+ → e+?{sub e}?{sub T}, or T+ →?+?{sub {mu}T}. The data sample contains 122 x 106 Y(3S) events recorded with the BABAR detector. We find no evidence for a narrow structure in the studied T+T− invariant mass region of 4.03 m{sub T+T−}
Author: Publisher: ISBN: Category : Languages : en Pages : 4
Book Description
The BABAR Collaboration has performed three searches for a light Higgs boson, A°, in radiative Upsilon decays:?(3S) →?A°, A° →??−;?(nS) →?A°, A° →?+?− (n = 2,3); and?(3S) →?A°, A° → invisible. Such a Higgs boson (A°) appears in the Next-to-Minimal Supersymmetric extensions of the Standard Model, where a light CP-odd Higgs boson couples strongly to b-quarks. The searches are based on data samples that consist of 122 x 106?(3S) and 99 x 106?(2S) decays, collected by the BABAR detector at the SLAC National Accelerator Laboratory. The searches reveal no evidence for an A°, and product of branching fractions upper limits, at 90% C.L., of (1.5-16) x 10−5, (0.44-44) x 10−6, and (0.7-31) x 10−6 were obtained for these searches, respectively. Also, we set the upper limits?(?{sub b} →?+?−)
Author: Publisher: ISBN: Category : Languages : en Pages : 8
Book Description
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.
Author: Publisher: ISBN: Category : Languages : en Pages : 32
Book Description
Our search is described for a Higgs boson decaying into two photons, one of which has an internal conversion to a muon or an electron pair (ll[gamma]). The analysis is performed using proton-proton collision data recorded with the CMS detector at the LHC at a centre-of-mass energy of 8 TeV, corresponding to an integrated luminosity of 19.7 fb-1. The events selected have an opposite-sign muon or electron pair and a high transverse momentum photon. No excess above background has been found in the three-body invariant mass range 120
Author: Publisher: ISBN: Category : Languages : en Pages : 215
Book Description
Elementary particle physics tries to find an answer to no minor question: What is our universe made of? To our current knowledge, the elementary constituents of matter are quarks and leptons, which interact via four elementary forces: electromagnetism, strong force, weak force and gravity. All forces, except gravity, can be described in one framework, the Standard Model of particle physics. The model's name reflects its exceptional success in describing all available experimental high energy physics data to high precision up to energies of about 100 GeV. An exception is given by the neutrino masses but even these can be integrated into the model. The Standard Model is based on the requirement of invariance of all physics processes under certain fundamental symmetry transformations. The consideration of these symmetries leads naturally to the correct description of the electromagnetic, weak and strong forces as the exchange of interaction particles, the gauge bosons. However, this formalism has the weakness that it only allows for massless particles. In order to obey the symmetries, a way to introduce the particle masses is given by the Higgs mechanism, which predicts the existence of the only particle of the Standard Model which has yet to be observed: the Higgs boson. In spite of the success of the Standard Model, it has to be considered as a low energy approximation of a more profound theory for various reasons. For example, the underlying theory is expected to allow for an integration of gravity into the framework and to provide a valid particle candidate for the dark matter in our universe. Furthermore, a solution has to be found to the problem that the Higgs boson as a fundamental scalar is sensitive to large radiative corrections driving its mass to the Planck scale of 1019 GeV. Several models have been proposed to address the remaining open questions of the Standard Model. Currently, the most promising extension of the Standard Model is Supersymmetry, which provides elegant solutions to the named problems by introducing a supersymmetric partner to each Standard Model particle. The superpartners of the matter particles are called squarks and sleptons, while the superpartners of the interaction particles are called gauginos. The mass eigenstates of the gauginos are referred to as charginos and neutralinos, according to their electric charge. Since the predicted supersymmetric particles have not yet been observed, Supersymmetry, if it exists in nature, has to be broken in such a way that the masses of Standard Model particles and of their superpartners differ. During the last decades, the energies accessible to experiments has steadily increased. The Tevatron Accelerator at the Fermi National Accelerator Laboratory, with the two multipurpose experiments D0 and CDF, provides currently the highest center-of-mass energy ever reached in experiments using collisions of protons and antiprotons ((square root)s = 1.96 TeV). The study of the particle collisions allows probing of predictions of the Standard Model and its extensions, e.g. Supersymmetry.
Author: Andrey Elagin Publisher: ISBN: Category : Languages : en Pages :
Book Description
A search for the Higgs boson decaying to tau tau using 7.8 fb^-1 of pp collisions at 1.96 TeV collected with CDF II detector is presented. The search is sensitive to four production mechanisms of the Higgs boson: ggH, WH, ZH and VBF. Modes where one tau decay leptonically, and another decay, hadronically, are considered. Two novel techniques are developed and used in the search. A Probabilistic Particle Flow Algorithm is used for energy measurements of the hadronic tau candidates. The signal is discriminated from backgrounds by the Missing Mass Calculator, which allows for full invariant mass reconstruction of tau tau pair. The data are found to be consistent with the background only hypothesis. Therefore a 95% confidence level upper limit on the Standard Model Higgs boson cross section was set. At M_H=120 GeV/c^2 observed limit is 14.9 x sigma_SM x Br(H -> tau tau).
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Author: Pavel Jež
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Author: Andrey Elagin