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The Collider Detector at Fermilab collected a unique sample of jets originating from bottom-quark fragmentation (b-jets) by selecting online proton-antiproton (pp̄) collisions with a vertex displaced from the pp̄ interaction point, consistent with the decay of a bottom-quark hadron. This data set, collected at a center-of-mass energy of 1.96 TeV, and corresponding to an integrated luminosity of 5.4 fb-1, is used to measure the Z-boson production cross section times branching ratio into bb̄. The number of Z→bb̄ events is determined by fitting the dijet-mass distribution, while constraining the dominant b-jet background, originating from QCD multijet events, with data. The result, σ(pp̄→Z)×B(Z→bb̄)=1.11±0.08(stat)±0.14(syst) nb, is the most precise measurement of this process, and is consistent with the standard-model prediction. The data set is also used to search for Higgs-boson production. No significant signal is expected in our data and the first upper limit on the cross section for the inclusive pp̄→H→bb̄ process at s=1.96 TeV is set, corresponding to 33 times the expected standard-model cross section, or σ=40.6 pb, at the 95% confidence level.
Search for standard-model Z and Higgs bosons decaying into a bottom-antibottom quark pair in proton-antiproton collisions at 1.96 TeV
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J. and Mukherjee;A. and Muller;Th and Murat;P. and Mussini;M. and Nachtman;J. and Nagai;Y. and Naganoma;J. and Nakano;I and Napier;A. and Nett;J. and Nigmanov;T. and Nodulman;L. and Noh;S. Y. and Norniella;O. and Oakes;L. and Oh;S. H. and Oh;Y. D. and Okusawa;T. and Orava;R. and Ortolan;L. and Pagliarone;C. and Palencia;E. and Palni;P. and Papadimitriou;V and Parker;W. and Pauletta;G. and Paulini;M. and Paus;C. and Phillips;T. J. and Piacentino;G. and Pianori;E. and Pilot;J. and Pitts;K. and Plager;C. and Pondrom;L. and Poprocki;S. and Potamianos;K. and Pranko;A. and Prokoshin;F. and Ptohos;F. and Punzi;G. and Redondo Fernandez;I and Renton;P. and Rescigno;M. and Rimondi;F. and Ristori;L. and Robson;A. and Rodriguez;T. and Rolli;S. and Ronzani;M. and Roser;R. and Rosner;J. L. and Ruffini;F. and Ruiz;A. and Russ;J. and Rusu;V and Sakumoto;W. K. and Sakurai;Y. and Santi;L. and Sato;K. and Saveliev;V and Savoy-Navarro;A. and Schlabach;P. and Schmidt;E. 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L. and Wittich;P. and Wolbers;S. and Wolfmeister;H. and Wright;T. and Wu;X. and Wu;Z. and Yamamoto;K. and Yamato;D. and Yang;T. and Yang;U. K. and Yang;Y. C. and Yao;W-M and Yeh;G. P. and Yi;K. and Yoh;J. and Yorita;K. and Yoshida;T. and Yu;G. B. and Yu;I and Zanetti;A. M. and Zeng;Y. and Zhou;C. and Zucchelli;S. and CDF Collaboration
2018-01-01
Abstract
The Collider Detector at Fermilab collected a unique sample of jets originating from bottom-quark fragmentation (b-jets) by selecting online proton-antiproton (pp̄) collisions with a vertex displaced from the pp̄ interaction point, consistent with the decay of a bottom-quark hadron. This data set, collected at a center-of-mass energy of 1.96 TeV, and corresponding to an integrated luminosity of 5.4 fb-1, is used to measure the Z-boson production cross section times branching ratio into bb̄. The number of Z→bb̄ events is determined by fitting the dijet-mass distribution, while constraining the dominant b-jet background, originating from QCD multijet events, with data. The result, σ(pp̄→Z)×B(Z→bb̄)=1.11±0.08(stat)±0.14(syst) nb, is the most precise measurement of this process, and is consistent with the standard-model prediction. The data set is also used to search for Higgs-boson production. No significant signal is expected in our data and the first upper limit on the cross section for the inclusive pp̄→H→bb̄ process at s=1.96 TeV is set, corresponding to 33 times the expected standard-model cross section, or σ=40.6 pb, at the 95% confidence level.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11584/256527
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Il report seguente simula gli indicatori relativi alla propria produzione scientifica in relazione alle soglie ASN 2023-2025 del proprio SC/SSD. Si ricorda che il superamento dei valori soglia (almeno 2 su 3) è requisito necessario ma non sufficiente al conseguimento dell'abilitazione. La simulazione si basa sui dati IRIS e sugli indicatori bibliometrici alla data indicata e non tiene conto di eventuali periodi di congedo obbligatorio, che in sede di domanda ASN danno diritto a incrementi percentuali dei valori. La simulazione può differire dall'esito di un’eventuale domanda ASN sia per errori di catalogazione e/o dati mancanti in IRIS, sia per la variabilità dei dati bibliometrici nel tempo. Si consideri che Anvur calcola i valori degli indicatori all'ultima data utile per la presentazione delle domande.
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