A Measurement of the Top Quark Mass in the Dilepton Decay Channel at CDF II

Jayatilaka, B.

doi:10.2172/892485

Cited by 4 publications

(4 citation statements)

References 47 publications

(44 reference statements)

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“…Select events based on optimized neural networks for the mass measurement, in order to increase significantly the signal to background ratio [82].…”

Section: Resultsmentioning

confidence: 99%

A New Top Mass Measurement in The Dilepton Channel

Trovato¹,

Infn²,

Pisa³

2008

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“…Select events based on optimized neural networks for the mass measurement, in order to increase significantly the signal to background ratio [82].…”

Section: Resultsmentioning

confidence: 99%

A New Top Mass Measurement in The Dilepton Channel

Trovato¹,

Infn²,

Pisa³

2008

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“…For b quark jets (matched to partons within a ∆R = 0.4 cone), we find the parton energy E parton and the Level 5 corrected ( [32]) jet energy E jet . We then perform a fit of δ = E p − E j with our functional form, which we take to be a double Gaussian, defined as equation 5.5 [39].…”

Section: Jet Transfer Functionmentioning

confidence: 99%

“…A more in depth explanation of the matrix elements is presented in [39], including the variables of integration, changes of variables required and the corresponding Jacobians. In addition to the integration needed for all matrix elements, there is an additional integration over the unknown intermediate Z and H bosons (see Figure 2.17).…”

Section: Processesmentioning

confidence: 99%

A Search for the Higgs Boson in the $ZH$ Dilepton Decay Channel at CDF II

Shekhar¹,

Duke²

2009

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This dissertation describes a search for the Standard Model Higgs boson produced in association with the Z boson via Higgs-strahlung at the CDF II detector at the Tevatron. At a Higgs boson mass between 100 GeV /c 2 and 135 GeV /c 2 , the primary Higgs decay mode is to a pair of b quarks. The associated Z boson can decay to a pair of electrons or muons, allowing detection of a final event signature of two visible leptons and two b quarks. This final state allows reduction of large QCD backgrounds compared to a hadronic Z boson decay, leading to a more sensitive search. To increase sensitivity, standard model matrix element probabilities for Z H signal and the dominant backgrounds are used as components to a likelihood fit in signal fraction.In 2.7 fb −1 of CDF II data, we see no evidence of production of a Higgs boson with a mass between 100 GeV c 2 and 150 GeV /c 2 . Using the Feldman-Cousins technique to set a limit, at 95% coverage and a Higgs boson mass of 115 GeV /c 2 , the median expected limit was 12.1 × σ S M and a limit of 8.2 × σ S M was observed, where σ S M is the NNLO theoretical cross section of p p → Z H → l + l − b b at s=1.96 T eV . Cross section limits are computed at a range of Higgs boson mass values between 100 GeV /c 2 and 150 GeV /c 2 .

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“…The errors quoted by the CDF W Z search [45] are used for dibosons, and the top mass measurement [46] is used for the tt cross section.…”

Section: Systematic Uncertaintiesmentioning

confidence: 99%

Search for super symmetry at the Tevatron using the trilepton signature

Dubé

2008

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This dissertation describes a search for the associated production of the supersymmetric particles, the chargino and the neutralino, through their R-parity conserving decays to three leptons and missing energy. This search is carried out using the data collected at the CDF experiment at the Tevatron √ s = 1.96 TeV pp collider at Fermilab. The results are obtained by combining five independent channels with varying signal to background ratio. Overall, a total of 6.4 ± 1.1 background events from standard model processes and 11.4 ± 1.1 signal events for a particular choice of mSUGRA model parameters are expected. The observation of 7 events in data is consistent with the standard model background expectation, and the mSUGRA model is constrained. Limits are set on the cross section of Chargino-Neutralino pair production, and a limit on the mass of the chargino is extracted. A method of obtaining model-independent results is also discussed.ii Acknowledgements I feel the deepest respect for my advisor Sunil Somalwar. I want to thank him for being a friend, a philosopher, and a guide in the truest sense of those words. Without him, I would not love particle physics; it is as simple as that. and Bob Stone who made sure that the computers work, the CAF runs smoothly and helped me with the day-to-day questions to which I wouldn't know where to find answers. Thanks to Nancy DeHaan for shielding me from the administrative quicksands.The trilepton analysis would not be any fun without Anadi, Else, Giulia, John, and Vadim.Working with them ensured that even the most annoying tasks were enjoyable. I want to thank them for all their guidance, scripts, code, and conversations. The convenors at CDF also deserve a special mention; Ben, Chris, Dave and Monica. They taught me to think carefully, do a good analysis, give a good talk and much more.iii Tim Koeth and Rouven Essig helped to make Batavia and Piscataway as much of a home as Pune is; for that I'm grateful. Between them, I'm sure they will cover the best of experiment and theory and it is a privilege to know them.The last two years have been made special by Aditya and Sarika, Amit and Diptee, Mandar and Shreya, Pankaj and Prajakta, Shreedhar and Meenal, and Salil. The good times we have had together has made sure that the evenings I had for my own were well spent. They have been a sounding board for my wildest ideas, and they have been patient with me.

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A Measurement of the Top Quark Mass in the Dilepton Decay Channel at CDF II

Cited by 4 publications

References 47 publications

A New Top Mass Measurement in The Dilepton Channel

A New Top Mass Measurement in The Dilepton Channel

A Search for the Higgs Boson in the $ZH$ Dilepton Decay Channel at CDF II

Search for super symmetry at the Tevatron using the trilepton signature

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