Search for the Higgs boson produced in association with<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>Z</mml:mi><mml:mo>→</mml:mo><mml:msup><mml:mi>ℓ</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:msup><mml:mi>ℓ</mml:mi><mml:mo>−</mml:mo></mml:msup></mml:math>using the matrix element method at CDF II

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doi:10.1103/physrevd.80.071101

Cited by 13 publications

(6 citation statements)

References 23 publications

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“…Due to time constraints, matrix element outputs [109] were not included as inputs to the final discriminants. The power of the matrix element outputs, however, might be diluted since the BDT outputs could be extracting similar event information.…”

Section: Notes On Future Workmentioning

confidence: 99%

A Search for the Standard Model Higgs Boson in CDF II Data

Lockwitz

2012

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2012This dissertation presents a search for the standard model Higgs boson in the associated production process pp → ZH → e + e − bb. Data amounting to an integrated luminosity of 7.5 fb −1 at √ s = 1.96 TeV collected at the Collider Detector at Fermilab (CDF) at the Tevatron are analyzed. Two objectives are pursued in the methods applied: maximize acceptance, and distinguish the signal from background. The first aim is met by applying a neural-network-based electron identification and considering multiple electron triggers in an effort to improve Z acceptance. In an attempt to maximize the Higgs acceptance, three b quark identification schemes are used allowing for varying event conditions. The latter goal is met by employing more multivariate techniques. First, the dijet mass resolution is improved by a neural network. Then, both single variables and boosted decision tree outputs are fed into a segmented final discriminant simultaneously isolating the signal-like events from the Z with additional jets background and the kinematically different tt background.Good agreement is seen with the null hypothesis and upper production cross section (σ ZH ) times branching ratio (BR(H → bb)) limits are set for 11 mass hypotheses between 100 and 150 GeV/c 2 at the 95% confidence level. For a Higgs boson mass of 115 GeV/c 2 , this channel sets an observed (expected) upper limit of 3.9 (5.8) times the standard model value of σ ZH × BR(H → bb). The inclusion of this channel within the combined CDF and Tevatron limits is discussed.

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Section: Notes On Future Workmentioning

confidence: 99%

A Search for the Standard Model Higgs Boson in CDF II Data

Lockwitz

2012

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“…Neural networks (CDF, 1.0 fb −1 [71]) and event probability distributions based on matrix elements (CDF, 2.7 fb −1 [72]) are implemented to discriminate the signal events from the main background, represented by Z+jets, top pairs and ZZ. DØ's measurement refers to the first 4.2 fb −1 of data [73].…”

Section: Low Mass Higgs Boson Searchesmentioning

confidence: 99%

Search for a Standard Model Higgs boson in the $\tau\tau$ decay channel produced in $p\bar{p}$ collisions at $\sqrt{s}$ = 1.96 TeV at Tevatron

Totaro

2011

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This thesis describes the search for the Standard Model Higgs boson decaying to tau lepton pairs, in the Tevatron proton-antiproton collisions at a center of mass energy √ s = 1.96 TeV. The search is based on approximately 2.3 fb −1 of CDF Run II data and is performed by considering the following signal processes: WH(→ τ τ ), ZH(→ τ τ ), qHq'→qτ τ q' and gg→H→ τ τ . Events are selected by requiring an hadronic tau and one isolated electron or muon, coming from the leptonic decay of one of the two taus. In addition, at least one calorimeter jet must be present in the final state.We expect 921.8±48.9 background events in the 1 jet channel and 159.4±11.6 in the ≥ 2 jets channel, while in data we observe 965 and 166 events, respectively.In order to improve the search sensitivity we employ a multivariate technique, based on a set of Boosted Decision Trees trained to get the best separation between signal and the dominant sources of background. We observe no evidence for a Higgs boson signal and therefore we set a 95% confidence level (C.L.) upper limit on the cross section relative to the SM predictions (σ/σ SM ).Results are presented for the Higgs boson mass varying from M H = 100 GeV/c 2 to M H = 150 GeV/c 2 . For the mass hypothesis of 120 GeV/c 2 the observed limit is 27.2, while the corresponding expected value is 23.4 +9.8 −6.4 . SommarioIn questa tesi viene descritta la ricerca del bosone di Higgs del Modello Standard nel canale di decadimento in coppie di leptoni τ , condotta al Tevatron in collisioni protonantiprotone ad un'energia nel centro di massa √ s = 1.96 TeV. L'analisi si basa su circa 2.3 fb −1 di dati raccolti dall'esperimento Collider Detector at Fermilab (CDF) ed è stata effettuata considerando i seguenti processi di produzione di segnale: WH(→ τ τ ), ZH(→ τ τ ), qHq'→qτ τ q' and gg→H→ τ τ .Gli eventi sono selezionati richiedendo un τ adronico ed un elettrone (o muone) isolato, quest'ultimo proveniente dal decadimento leptonico di uno dei due τ originari. In aggiunta, almeno un getto calorimetrico deve essere presente nello stato finale.Il numero di eventi di fondo attesi è 921.8±48.9 nel canale con un unico getto e 159.4±11.6 nel canale con due o più getti calorimetrici, mentre gli eventi osservati sono rispettivamente 965 e 166.Per aumentare la sensitività dell'analisi si è impiegato di un metodo multivariato, basato su un set di Boosted Decision Trees allenati per separare il segnale dalle principali sorgenti di fondo. I dati non mostrano alcuna evidenza di produzione di bosoni di Higgs, pertanto sono stati calcolati i limiti al 95% di Livello di Confidenza sulla sezione d'urto di produzione, relativamente ai valori previsti dal Modello Standard.I risultati sono presentati per diversi possibili della massa del bosone di Higgs, nell'intervallo comopreso tra 100 GeV/c 2 e 150 GeV/c 2 . Nell'ipotesi M H = 120 GeV/c 2 il limite osservato è 27.2 volte superiore alla sezione d'urto predetta, mentre il corrispondente valore atteso è 23.4 +9.8 −6.4 . v D.6 M H = 130 GeV/c 2 .

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“…We include uncertainties on the background and signal estimates as Gaussian The SM Higgs search presented in this dissertation achieves significant improvement in sensitivity over previous CDF II searches in the mode ZH → + − bb [35,36], producing the world's strongest upper limits on the σ SM ZH × BR(H → bb). Table 11.1 shows the degree of improvement achieved by this search compared to previous CDF II efforts.…”

Section: Observed and Expected Limitsmentioning

confidence: 99%

“…Matrix element calculations have previously been applied in top mass measurements [95,96] and Higgs boson searches [97,36]. Here we present a brief overview of the method.…”

Section: Matrix Elementsmentioning

confidence: 99%

“…• expanded use of muon triggers To increase the sensitivity to a ZH signal over previous CDF searches [35,36], we implement new electron and expanded b-jet identification algorithms. We utilize neural network classifiers enhanced with matrix element probabilities, a b-jet identifying neural network [102], and multivariate jet energy corrections to maximize the separation of signal from SM backgrounds.…”

Section: Future Prospectsmentioning

confidence: 99%

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A search for the Standard Model Higgs boson in the process ZH → ℓ+ℓ-b$\bar{b}$ in 4.1 fb-1 of CDF II data

Shalhout¹

2010

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Search for the Higgs boson produced in association withZ→ℓ+ℓ−using the matrix element method at CDF II

Cited by 13 publications

References 23 publications

A Search for the Standard Model Higgs Boson in CDF II Data

A Search for the Standard Model Higgs Boson in CDF II Data

Search for a Standard Model Higgs boson in the $\tau\tau$ decay channel produced in $p\bar{p}$ collisions at $\sqrt{s}$ = 1.96 TeV at Tevatron

A search for the Standard Model Higgs boson in the process ZH → ℓ<sup>+</sup>ℓ<sup>-</sup>b$\bar{b}$ in 4.1 fb<sup>-1</sup> of CDF II data

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