Search for a standard model Higgs boson produced in association with a top-quark pair and decaying to bottom quarks using a matrix element method

Please use this identifier to cite or link to this item: https://ir.lib.ncu.edu.tw/handle/987654321/105745

Title:	Search for a standard model Higgs boson produced in association with a top-quark pair and decaying to bottom quarks using a matrix element method
Authors:	林宗泰;Levine, Aaron;Poehlsen, Jennifer;Apresyan, Artur;Bagliesi, Giuseppe;Velkovska, Julia;Varelas, Nikos;Wöhrmann, Clemens;Seva, Tomislav;Innocente, Vincenzo;Swain, Sanjay Kumar;Hadjiiska, Roumyana;Gascon, Susan;Geiser, Achim;Spalding, William J;Shukla, Prashant;Colaleo, Anna;Piotrzkowski, Krzysztof;Steinbrück, Georg;Avetisyan, Aram;Rose, Anthony;Elliott-Peisert, Anna;Farrell, Chris;Mittal, Monika;Junkes, Alexandra;Pant, Lalit Mohan;Tricomi, Alessia;Martinez, German;Cockerill, David JA;Ferencek, Dinko;Marchesini, Ivan;Haas, Jeff;Christopher, Grant;Tosi, Nicolò;Ekmedzic, Marko;Lu, Ying;Brooke, James John;Mott, Alexander;Ahmad, Ashfaq;Mohanty, Ajit Kumar;Spiropulu, Maria;De Moraes Gregores, Eduardo;Malcles, Julie;Dewanjee, Ram Krishna;Tamponi, Umberto;Jain, Shilpi;Luyckx, Sten;Danielson, Thomas;Fabbri, Fabrizio;Berry, Edmund;Chwalek, Thorsten;Dupont-Sagorin, Niels;Paktinat Mehdiabadi, Saeid;Nowatschin, Dominik;Korol, Ievgen;Szillasi, Zoltan;Woods, Nathaniel;Hatakeyama, Kenichi;Kazana, Malgorzata;Dumanoglu, Isa;Frueboes, Tomasz;Brandt, Stephanie;Bachtis, Michail;Costa, Salvatore;Gerosa, Raffaele;Letts, James;Kim, Tae Jeong;Saka, Halil;Piparo, Danilo;Van Mechelen, Pierre;Castaneda Hernandez, Alfredo;Fulcher, Jonathan;West, Christopher;Gomez, Gervasio;Gninenko, Sergei;Dinardo, Mauro Emanuele;Ptochos, Fotios;Wilken, Rachel;Ford, William T;Damgov, Jordan;Chao, Yuan;Beri, Suman Bala;Cankocak, Kerem;Van Remortel, Nick;Rodozov, Mircho;Halkiadakis, Eva;Navarria, Francesco;Girgis, Semiray;Bellan, Riccardo;Kim, Gui Nyun;Sanders, Stephen;Chang, Sunghyun;Brochet, Sébastien;De La Cruz, Begona;Goldstein, Joel;Naumann-Emme, Sebastian;George, Christopher;Vavilov, Sergey;Dugad, Shashikant;Snow, Gregory R;Gilbert, Andrew
Contributors:	理學院物理學系
Keywords:	Analysis;Astronomy;Astrophysics and Cosmology;Collisions (Nuclear physics);Confidence intervals;Decay;Elementary Particles;Experiment;Hadrons;Heavy Ions;Higgs bosons;High Energy Physics - Experiment;Jets;Mathematical models;Measurement Science and Instrumentation;Methods;Nuclear Energy;Nuclear Physics;Particle Physics;Physics;Physics and Astronomy;Quantum Field Theories;Quantum Field Theory;Quarks;Regular - Experimental Physics;Regular Article - Experimental Physics;Searching;Specific gravity;String Theory;Texts
Date:	2015-06-10
Issue Date:	2026-04-23 12:51:52 (UTC+8)
Publisher:	Springer New York;Berlin/Heidelberg: Springer Berlin Heidelberg
Abstract:	摘要： A search for a standard model Higgs boson produced in association with a top-quark pair and decaying to bottom quarks is presented. Events with hadronic jets and one or two oppositely charged leptons are selected from a data sample corresponding to an integrated luminosity of 19.5 fb$^{-1}$ collected by the CMS experiment at the LHC in pp collisions at a centre-of-mass energy of 8 TeV. In order to separate the signal from the larger $\mathrm{t \bar{t}}$+jets background, this analysis uses a matrix element method that assigns a probability density value to each reconstructed event under signal or background hypotheses. The ratio between the two values is used in a maximum likelihood fit to extract the signal yield. The results are presented in terms of the measured signal strength modifier, $\mu$, relative to the standard model prediction for a Higgs boson mass of 125 GeV. The observed (expected) exclusion limit at a 95% confidence level is $\mu$ lower than 4.2 (3.3), corresponding to a best fit value $\hat{\mu}=1.2^{+1.6}_{-1.5}$. A search for a standard model Higgs boson produced in association with a top-quark pair and decaying to bottom quarks is presented. Events with hadronic jets and one or two oppositely charged leptons are selected from a data sample corresponding to an integrated luminosity of 19.5 $\,\text {fb}^\text {-1}$ collected by the CMS experiment at the LHC in $\mathrm {p}\mathrm {p}$ collisions at a centre-of-mass energy of 8 $\,\hbox {TeV}$ . In order to separate the signal from the larger $\hbox {t}\overline{\hbox {t}}$ + jets background, this analysis uses a matrix element method that assigns a probability density value to each reconstructed event under signal or background hypotheses. The ratio between the two values is used in a maximum likelihood fit to extract the signal yield. The results are presented in terms of the measured signal strength modifier, $\mu $ , relative to the standard model prediction for a Higgs boson mass of 125 $\,\hbox {GeV}$ . The observed (expected) exclusion limit at a 95 % confidence level is $\mu <4.2$ (3.3), corresponding to a best fit value $\hat{\mu }=1.2^{+1.6-1.5}$ . A search for a standard model Higgs boson produced in association with a top-quark pair and decaying to bottom quarks is presented. Events with hadronic jets and one or two oppositely charged leptons are selected from a data sample corresponding to an integrated luminosity of 19.5 inverse femtobarns collected by the CMS experiment at the LHC in pp collisions at a centre-of-mass energy of 8 TeV. In order to separate the signal from the larger t t-bar + jets background, this analysis uses a matrix element method that assigns a probability density value to each reconstructed event under signal or background hypotheses. The ratio between the two values is used in a maximum likelihood fit to extract the signal yield. The results are presented in terms of the measured signal strength modifier, mu, relative to the standard model prediction for a Higgs boson mass of 125 GeV. The observed (expected) exclusion limit at a 95% confidence level is mu < 4.2 (3.3), corresponding to a best fit value mu-hat = 1.2 +1.6 -1.5. 其他題名： Eur. Phys. J. C 其他題名： Eur Phys J C Part Fields 出版者： Berlin/Heidelberg: Springer Berlin Heidelberg 出版日期： 2015-06-09 出處： The European physical journal. C, Particles and fields, 2015-06, Vol.75 (6), p.251-28, Article 251 資源來源： Publicly Available Content Database 版權： CERN for the benefit of the CMS collaboration 2015 版權： COPYRIGHT 2015 Springer 版權： The Author(s) 2015 版權： CC0 1.0 - Universal 識別號： ISSN: 1434-6044 識別號： ISSN: 1434-6052 識別號： EISSN: 1434-6052 識別號： DOI: 10.1140/epjc/s10052-015-3454-1 識別號： PMID: 26097407
Appears in Collections:	[Department of Physics] journal & Dissertation

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