Search for higgs bosons produced in association with b quarks

DWe present a search for neutral Higgs bosons decaying into b-bbar, produced in association with b quarks in p-pbar collisions.

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This process could be observable in supersymmetric models with high values of tan beta. The event sample corresponds to 2. We search for an enhancement in the mass of the two lead jets in events with three jets identified as coming from b quarks using a displaced vertex algorithm.

A data-driven procedure is used to estimate the dijet mass spectrum of the non-resonant multijet background. The contributions of backgrounds and possible signal are determined by a two-dimensional fit of the data, using the dijet mass together with an additional variable which is sensitive to the flavor composition of the three tagged jets. We also interpret the results as limits on tan beta in supersymmetric Higgs models including the effects of the Higgs boson width.

Location of Repository. Aaltonen, B. Alvarez Gonzalez, S.

Search for Higgs bosons produced in association with b quarks

Amerio, D. Amidei, A. Anastassov, A. Annovi, J. Antos, G. Apollinari, J. Appel, A. Apresyan, T. Arisawa, A. Artikov, J. Asaadi, W.

Ashmanskas, B. Auerbach, A.

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Aurisano, F. Azfar, W. Badgett, A.London ; Achkar, Baida Gottingen U. Autonoma, Madrid, Dept. High Energy Phys. London ; Camplani, Alessandra Bohr Inst. Tsing Hua U.

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Petersburg ; Fabbri, Federica Glasgow U. Petersburg ; St. Petersburg Polytechnic Inst. London ; Grud, Christopher Michigan U. London ; Konstantinidis, Nikolaos University Coll. London ; Konya, Balazs Lund U. London ; Oakham, Gerald Carleton U. Petersburg ; Puri, Akshat Illinois U. London ; Schaarschmidt, Jana Washington U. Petersburg ; Scheirich, Daniel Charles U.

London ; Shi, Liaoshan Taiwan, Inst. Petersburg ; Sommer, Philip Sheffield U. London ; Valderanis, Chrysostomos Munich U. London ; Warrack, Neil Glasgow U.

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Article Report number arXiv Note 47 pages in total, author list starting page 31, 11 figures, 5 tables, published in Physical Review D. D DOI No evidence of a signal is found.

Results are interpreted within the two-Higgs-doublet model and the Minimal Supersymmetric Standard Model. Back to search. Record createdlast modified Similar records. Fulltext: PDF. Fulltext from Publisher: PDF.

D HEP Experiments. Learn more. Citations per year 1 0. References Figures 0.

search for higgs bosons produced in association with b quarks

Particle Data Group. Review of particle physics. C 38 IEEE Trans. DOI: A Supersymmetry primer Stephen P. Martin Northern Illinois U. High Energy Phys. Beyond the standard model: In search of supersymmetry D. Hahn Munich, Max Planck Inst. Heinemeyer Cantabria Inst. Hollik Munich, Max Planck Inst. Rzehak Freiburg U. Weiglein DESY. Frank Karlsruhe U. Rzehak PSI, Villigen. JHEP 02 Heinemeyer Munich U.

Slavich Munich, Max Planck Inst. Weiglein Durham U. C 28 Heinemeyer DESY. Weiglein Karlsruhe U.Contact an author. Update request. If you are one of the authors' document, you have the possibility to update some of its metadata by using the editor form. Advanced search. Browse by More informations. Home Titles list Search for Higgs bosons produced in association with b -quarks. Scientific Article. CDF Collaboration.

Contact an author Update request. Update Deposited on : View all records: Back to top About Swiss Copyright. Search for Higgs bosons produced in association with b -quarks. The event sample corresponds to 2.

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We search for an enhancement in the mass of the two leading jets in events with three jets identified as coming from b quarks using a displaced vertex algorithm. A data-driven procedure is used to estimate the dijet mass spectrum of the nonresonant multijet background. The contributions of backgrounds and a possible Higgs boson signal are determined by a two-dimensional fit of the data, using the dijet mass together with an additional variable which is sensitive to the flavor composition of the three tagged jets.

DOI: In: Physical Review. D, vol.According to the Standard Model, quarks, charged leptons, and W and Z bosons obtain their mass through interactions with the Higgs field, a quantum fluctuation of which gives rise to the Higgs boson. To test this theory, ATLAS takes high-precision measurements of the interactions between the Higgs boson and these particles.

As the top quark is the heaviest particle in the Standard Model, this measurement is one of the most sensitive tests of the Higgs mechanism. The CMS Collaboration recently reported the observation of ttH production by combining and data with data taken at lower collision energies in earlier LHC runs. The probability of a Higgs boson decaying to a diphoton pair is only about 0.

search for higgs bosons produced in association with b quarks

However, because the energy and direction of photons can be well measured with the ATLAS detector, the reconstructed mass peak obtained with this decay mode is narrow. It is therefore possible to observe a signal even when the number of events is low. As the decay of a top quark always produces a b-quark, identifying jets that arise from b-quarks is essential for reducing backgrounds.

Each category is analysed separately by studying the distribution of the invariant mass of the diphoton candidates in selected events. This distribution is fit to a combination of signal Higgs boson decay to diphoton in events containing a top-quark pair and background cases where the diphoton candidate does not arise from a Higgs boson or where the event does not contain a true top-quark pair. The numbers of fitted signal events in the different categories are then statistically combined, taking into account correlated experimental and theoretical systematic uncertainties.

The result of the above procedure, using 80 fb -1 of data recorded inand the recent run of the LHC, is summarised in Figure 1, which shows the diphoton invariant mass distribution, summed over categories weighted by their signal purity.

The significance of the observed signal is 4. Due to the very clean detector signature of the four-lepton decay mode, this channel is essentially free of backgrounds apart from small contributions from Higgs bosons produced through other production modes than ttH. However, this decay mode is even rarer than that of diphotons, with less than one event expected from ttH production in the 80 fb -1 of the full dataset. A dedicated search for this decay was performed, but no candidate events were found in the ATLAS data.

The measurements described above have been combined with the previously reported searches for ttH that used and data. Decays of the Higgs boson to a b-quark pair and to a pair of W bosons or tau leptons had observed expected significances of 1. After the combination, the observed expected significance of the signal over the background is 5. The ratio of the combined ttH cross section measurement and the cross section measurements separated by Higgs boson decay modes are presented in Figure 2.

Further searches for the ttH process were performed using 7 and 8 TeV data collected during Run 1. When combined with the results, the observed expected significance is 6.

ATLAS has observed the production of the Higgs boson in association with a top-quark pair with a significance of 6. The measured ttH production cross section is consistent with the Standard Model prediction.

search for higgs bosons produced in association with b quarks

This measurement provides direct evidence for the coupling of the Higgs boson to the top quark and supports the Standard Model mechanism whereby the top quark obtains its mass through interaction with the Higgs field.

Physics Briefing. This rare process is one of the most sensitive tests of the Higgs mechanism. Evidence for ttH production in the diphoton channel in the dataset The probability of a Higgs boson decaying to a diphoton pair is only about 0. Figure 2: Combined ttH production cross section, as well as cross sections measured in the individual analyses, divided by the SM cross section prediction. ML indicates the analysis of the two and three lepton final states multilepton.

The black lines show the total uncertainties, while the bands indicate the statistical and systematic uncertainties. The red line indicates the SM cross section prediction, and the grey band represents the theoretical uncertainties on the prediction.HEP Experiments.

Learn more. Morad Aaboud Oujda U. Published in: Phys. D 97 7 DOI: Citations per year 3 56 48 Abstract: APS. Note: 68 pages in total, author list starting page 52, 16 figures, 8 tables, published in Phys.

SSTH p p: colliding beams top: pair production Higgs particle: associated production p p: scattering Higgs particle: mass Higgs particle: hadronic decay bottom: pair production bottom: particle identification top: decay.

References Figures Englert Brussels U. Brout Brussels U. Higgs Edinburgh U. Guralnik Imperial Coll. Hagen Imperial Coll. Kibble Imperial Coll. Georges Aad Freiburg U. B Serguei Chatrchyan Yerevan Phys. Partial Symmetries of Weak Interactions S. Glashow Copenhagen U.

Englert Glasgow U. Freitas Pittsburgh U. Plehn Heidelberg U. G 41 JHEP 08 D 29 Associated production of heavy Higgs boson with top quarks. B 29 Dawson Brookhaven. Orr Rochester U.

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Reina Florida State U. D 67 Beenakker Nijmegen U. Dittmaier DESY.

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Kramer Edinburgh U. Plumper DESY. Spira PSI, Villigen.Thank you for registering If you'd like to change your details at any time, please visit My account. The discovery of additional Higgs bosons could therefore be a gateway to new symmetries in nature. The new analysis provides a considerable increase in sensitivity to MSSM scenarios compared to previous results.

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The heavy neutral Higgs bosons A CP odd and H CP even are produced mainly via gluon—gluon interactions or in association with bottom quarks.

One of the challenges of the analysis is the misidentification of backgrounds with hadronic jets as tau candidates.

These backgrounds are estimated from data by measuring the misidentification probabilities and applying them to events in control regions representative of the event selection.

The measurement places limits on the production cross section that can be translated into constraints on MSSM parameters. ATLAS continues to refine this and conduct further searches for heavy Higgs bosons in various final states. IOP Publishing Jobs. Sign in Register.

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Higgs and electroweak News Tau pairs speed search for heavy Higgs bosons 11 May New-issue alert: sign up today. Read previous Strong interactions News First sight of the running of the top-quark mass.

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