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The inclusive top quark pair (tt¯tt¯) production cross-section σtt¯σtt¯ has been measured in proton–proton collisions at s√=7 TeVs=7 TeV and s√=8 TeVs=8 TeV with the ATLAS experiment at the LHC, using tt¯tt¯ events with an opposite-charge eμeμ pair in the final state. The measurement was performed with the 2011 7 TeV dataset corresponding to an integrated luminosity of 4.6 fb−1fb−1 and the 2012 8 TeV dataset of 20.3 fb−1fb−1. The numbers of events with exactly one and exactly two bb-tagged jets were counted and used to simultaneously determine σtt¯σtt¯ and the efficiency to reconstruct and bb-tag a jet from a top quark decay, thereby minimising the associated systematic uncertainties. The cross-section was measured to be: σtt¯σtt¯=182.9±3.1±4.2±3.6±3.3 pb (s√=7 TeV)and=242.4±1.7±5.5±7.5±4.2 pb (s√=8 TeV), σtt¯=182.9±3.1±4.2±3.6±3.3 pb (s=7 TeV)andσtt¯=242.4±1.7±5.5±7.5±4.2 pb (s=8 TeV), where the four uncertainties arise from data statistics, experimental and theoretical systematic effects, knowledge of the integrated luminosity and of the LHC beam energy. The results are consistent with recent theoretical QCD calculations at next-to-next-to-leading order. Fiducial measurements corresponding to the experimental acceptance of the leptons are also reported, together with the ratio of cross-sections measured at the two centre-of-mass energies. The inclusive cross-section results were used to determine the top quark pole mass via the dependence of the theoretically predicted cross-section on mpoletmtpole giving a result of mpoletmtpole=172.9+2.5−2.6=172.9−2.6+2.5 GeV. By looking for an excess of tt¯tt¯ production with respect to the QCD prediction, the results were also used to place limits on the pair-production of supersymmetric top squarks t~1t~1 with masses close to the top quark mass, decaying via t~1→tχ~01t~1→tχ~10 to predominantly right-handed top quarks and a light neutralino χ~01χ~10, the lightest supersymmetric particle. Top squarks with masses between the top quark mass and 177 GeV are excluded at the 95 % confidence level.
Aad, G., Abbott, B., Abdallah, J., Abdel Khalek, S., Abdinov, O., Aben, R., et al. (2014). Measurement of the t(t)over-bar production cross-section using e mu events with b-tagged jets in pp collisions at root s=7 and 8 TeV with the ATLAS detector. THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS, 74(10), 1-32 [10.1140/epjc/s10052-014-3109-7].
Measurement of the t(t)over-bar production cross-section using e mu events with b-tagged jets in pp collisions at root s=7 and 8 TeV with the ATLAS detector
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Henrichs;A. M. Henriques Correia;S. Henrot-Versille;C. Hensel;G. H. Herbert;Y. Hernández Jiménez;R. Herrberg-Schubert;G. Herten;R. Hertenberger;L. Hervas;G. G. Hesketh;N. P. Hessey;R. Hickling;E. Higón-Rodriguez;E. Hill;J. C. Hill;K. H. Hiller;S. Hillert;S. J. Hillier;I. Hinchliffe;E. Hines;M. Hirose;D. Hirschbuehl;J. Hobbs;N. Hod;M. C. Hodgkinson;P. Hodgson;A. Hoecker;M. R. Hoeferkamp;F. Hoenig;J. Hoffman;D. Hoffmann;J. I. Hofmann;M. Hohlfeld;T. R. Holmes;T. M. Hong;L. Hooft van Huysduynen;Y. Horii;J-Y. Hostachy;S. Hou;A. Hoummada;J. Howard;J. Howarth;M. Hrabovsky;I. Hristova;J. Hrivnac;T. Hryn’ova;C. Hsu;P. J. Hsu;S. -C. Hsu;D. Hu;X. Hu;Y. Huang;Z. Hubacek;F. Hubaut;F. Huegging;T. B. Huffman;E. W. Hughes;G. Hughes;M. Huhtinen;T. A. Hülsing;M. Hurwitz;N. Huseynov;J. Huston;J. Huth;G. Iacobucci;G. Iakovidis;I. Ibragimov;L. Iconomidou-Fayard;E. Ideal;P. Iengo;O. Igonkina;T. Iizawa;Y. Ikegami;K. Ikematsu;M. Ikeno;Y. Ilchenko;D. Iliadis;N. Ilic;Y. Inamaru;T. Ince;P. Ioannou;M. Iodice;K. Iordanidou;V. Ippolito;A. Irles Quiles;C. Isaksson;M. Ishino;M. Ishitsuka;R. Ishmukhametov;C. Issever;S. Istin;J. M. Iturbe Ponce;R. Iuppa;J. Ivarsson;W. Iwanski;H. Iwasaki;J. M. Izen;V. Izzo;B. Jackson;M. Jackson;P. Jackson;M. R. Jaekel;V. Jain;K. Jakobs;S. Jakobsen;T. Jakoubek;J. Jakubek;D. O. Jamin;D. K. Jana;E. Jansen;H. Jansen;J. Janssen;M. Janus;G. Jarlskog;N. Javadov;T. Javůrek;L. Jeanty;J. Jejelava;G. -Y. Jeng;D. Jennens;P. Jenni;J. Jentzsch;C. Jeske;S. Jézéquel;H. Ji;J. Jia;Y. Jiang;M. Jimenez Belenguer;S. Jin;A. Jinaru;O. Jinnouchi;M. D. Joergensen;K. E. Johansson;P. Johansson;K. A. Johns;K. Jon-And;G. Jones;R. W. L. Jones;T. J. Jones;J. Jongmanns;P. M. Jorge;K. D. Joshi;J. Jovicevic;X. Ju;C. A. Jung;R. M. Jungst;P. Jussel;A. Juste Rozas;M. Kaci;A. Kaczmarska;M. Kado;H. Kagan;M. Kagan;E. Kajomovitz;C. W. Kalderon;S. Kama;A. Kamenshchikov;N. Kanaya;M. Kaneda;S. Kaneti;V. A. Kantserov;J. Kanzaki;B. Kaplan;A. Kapliy;D. Kar;K. Karakostas;N. Karastathis;M. Karnevskiy;S. N. Karpov;Z. M. Karpova;K. Karthik;V. Kartvelishvili;A. N. Karyukhin;L. Kashif;G. Kasieczka;R. D. Kass;A. Kastanas;Y. Kataoka;A. Katre;J. Katzy;V. Kaushik;K. Kawagoe;T. Kawamoto;G. Kawamura;S. Kazama;V. F. Kazanin;M. Y. Kazarinov;R. Keeler;R. Kehoe;M. Keil;J. S. Keller;J. J. Kempster;H. Keoshkerian;O. Kepka;B. P. Kerševan;S. Kersten;K. Kessoku;J. Keung;F. Khalil-zada;H. Khandanyan;A. Khanov;A. Khodinov;A. Khomich;T. J. Khoo;G. Khoriauli;A. Khoroshilov;V. Khovanskiy;E. Khramov;J. Khubua;H. Y. Kim;H. Kim;S. H. Kim;N. Kimura;O. Kind;B. T. King;M. King;R. S. B. King;S. B. King;J. Kirk;A. E. Kiryunin;T. Kishimoto;D. Kisielewska;F. Kiss;T. Kittelmann;K. Kiuchi;E. Kladiva;M. Klein;U. Klein;K. Kleinknecht;P. Klimek;A. Klimentov;R. Klingenberg;J. A. Klinger;T. Klioutchnikova;P. F. Klok;E. -E. Kluge;P. Kluit;S. Kluth;E. Kneringer;E. B. F. G. Knoops;A. Knue;D. Kobayashi;T. Kobayashi;M. Kobel;M. Kocian;P. Kodys;P. Koevesarki;T. Koffas;E. Koffeman;L. A. Kogan;S. Kohlmann;Z. Kohout;T. Kohriki;T. Koi;H. Kolanoski;I. Koletsou;J. Koll;A. A. Komar;Y. Komori;T. Kondo;N. Kondrashova;K. Köneke;A. C. König;S. König;T. Kono;R. Konoplich;N. Konstantinidis;R. Kopeliansky;S. Koperny;L. Köpke;A. K. Kopp;K. Korcyl;K. Kordas;A. Korn;A. A. Korol;I. Korolkov;E. V. Korolkova;V. A. Korotkov;O. Kortner;S. Kortner;V. V. Kostyukhin;V. M. Kotov;A. Kotwal;C. Kourkoumelis;V. Kouskoura;A. Koutsman;R. Kowalewski;T. Z. Kowalski;W. Kozanecki;A. S. Kozhin;V. Kral;V. A. Kramarenko;G. Kramberger;D. Krasnopevtsev;M. W. Krasny;A. Krasznahorkay;J. K. Kraus;A. Kravchenko;S. Kreiss;M. Kretz;J. Kretzschmar;K. Kreutzfeldt;P. Krieger;K. Kroeninger;H. Kroha;J. Kroll;J. Kroseberg;J. Krstic;U. Kruchonak;H. Krüger;T. Kruker;N. Krumnack;Z. V. Krumshteyn;A. Kruse;M. C. Kruse;M. Kruskal;T. Kubota;S. Kuday;S. Kuehn;A. Kugel;A. Kuhl;T. Kuhl;V. Kukhtin;Y. Kulchitsky;S. Kuleshov;M. Kuna;J. Kunkle;A. Kupco;H. Kurashige;Y. A. Kurochkin;R. Kurumida;V. Kus;E. S. Kuwertz;M. Kuze;J. Kvita;A. La Rosa;L. La Rotonda;C. Lacasta;F. Lacava;J. Lacey;H. Lacker;D. Lacour;V. R. Lacuesta;E. Ladygin;R. Lafaye;B. Laforge;T. Lagouri;S. Lai;H. Laier;L. Lambourne;S. Lammers;C. L. Lampen;W. Lampl;E. Lançon;U. Landgraf;M. P. J. Landon;V. S. Lang;A. J. Lankford;F. Lanni;K. Lantzsch;S. Laplace;C. Lapoire;J. F. Laporte;T. Lari;M. Lassnig;P. Laurelli;W. Lavrijsen;A. T. Law;P. Laycock;O. Le Dortz;E. Le Guirriec;E. Le Menedeu;T. LeCompte;F. Ledroit-Guillon;C. A. Lee;H. Lee;J. S. H. Lee;S. C. Lee;L. Lee;G. Lefebvre;M. Lefebvre;F. Legger;C. Leggett;A. Lehan;M. Lehmacher;G. Lehmann Miotto;X. Lei;W. A. Leight;A. Leisos;A. G. Leister;M. A. L. Leite;R. Leitner;D. Lellouch;B. Lemmer;K. J. C. Leney;T. Lenz;G. Lenzen;B. Lenzi;R. Leone;S. Leone;K. Leonhardt;C. Leonidopoulos;S. Leontsinis;C. Leroy;C. G. Lester;C. M. Lester;M. Levchenko;J. Levêque;D. Levin;L. J. Levinson;M. Levy;A. Lewis;G. H. Lewis;A. M. Leyko;M. Leyton;B. Li;B. Li;H. Li;H. L. Li;L. Li;L. Li;S. Li;Y. Li;Z. Liang;H. Liao;B. Liberti;P. Lichard;K. Lie;J. Liebal;W. Liebig;C. Limbach;A. Limosani;S. C. Lin;T. H. Lin;F. Linde;B. E. Lindquist;J. T. Linnemann;E. Lipeles;A. Lipniacka;M. Lisovyi;T. M. Liss;D. Lissauer;A. Lister;A. M. Litke;B. Liu;D. Liu;J. B. Liu;K. Liu;L. Liu;M. Liu;M. Liu;Y. Liu;M. Livan;S. S. A. Livermore;A. Lleres;J. Llorente Merino;S. L. Lloyd;F. Lo Sterzo;E. Lobodzinska;P. Loch;W. S. Lockman;T. Loddenkoetter;F. K. Loebinger;A. E. Loevschall-Jensen;A. Loginov;T. Lohse;K. Lohwasser;M. Lokajicek;V. P. Lombardo;B. A. Long;J. D. Long;R. E. Long;L. Lopes;D. Lopez Mateos;B. Lopez Paredes;I. Lopez Paz;J. Lorenz;N. Lorenzo Martinez;M. Losada;P. Loscutoff;X. Lou;A. Lounis;J. Love;P. A. Love;A. J. Lowe;F. Lu;N. Lu;H. J. Lubatti;C. Luci;A. Lucotte;F. Luehring;W. Lukas;L. Luminari;O. Lundberg;B. Lund-Jensen;M. Lungwitz;D. Lynn;R. Lysak;E. Lytken;H. Ma;L. L. Ma;G. Maccarrone;A. Macchiolo;J. Machado Miguens;D. Macina;D. Madaffari;R. Madar;H. J. Maddocks;W. F. Mader;A. Madsen;M. Maeno;T. Maeno;E. Magradze;K. Mahboubi;J. Mahlstedt;S. Mahmoud;C. Maiani;C. Maidantchik;A. A. Maier;A. Maio;S. Majewski;Y. Makida;N. Makovec;P. Mal;B. Malaescu;Pa. Malecki;V. P. Maleev;F. Malek;U. Mallik;D. Malon;C. Malone;S. Maltezos;V. M. Malyshev;S. Malyukov;J. Mamuzic;B. Mandelli;L. Mandelli;I. Mandić;R. Mandrysch;J. Maneira;A. Manfredini;L. Manhaes de Andrade Filho;J. A. Manjarres Ramos;A. Mann;P. M. Manning;A. Manousakis-Katsikakis;B. Mansoulie;R. Mantifel;L. Mapelli;L. March;J. F. Marchand;G. Marchiori;M. Marcisovsky;C. P. Marino;M. Marjanovic;C. N. Marques;F. Marroquim;S. P. Marsden;Z. Marshall;L. F. Marti;S. Marti-Garcia;B. Martin;B. Martin;T. A. Martin;V. J. Martin;B. Martin dit Latour;H. Martinez;M. Martinez;S. Martin-Haugh;A. C. Martyniuk;M. Marx;F. Marzano;A. Marzin;L. Masetti;T. Mashimo;R. Mashinistov;J. Masik;A. L. Maslennikov;I. Massa;L. Massa;N. Massol;P. Mastrandrea;A. Mastroberardino;T. Masubuchi;P. Mättig;J. Mattmann;J. Maurer;S. J. Maxfield;D. A. Maximov;R. Mazini;L. Mazzaferro;G. Mc Goldrick;S. P. Mc Kee;A. McCarn;R. L. McCarthy;T. G. McCarthy;N. A. McCubbin;K. W. McFarlane;J. A. Mcfayden;G. Mchedlidze;S. J. McMahon;R. A. McPherson;A. Meade;J. Mechnich;M. Medinnis;S. Meehan;S. Mehlhase;A. Mehta;K. Meier;C. Meineck;B. Meirose;C. Melachrinos;B. R. Mellado Garcia;F. Meloni;A. Mengarelli;S. Menke;E. Meoni;K. M. Mercurio;S. Mergelmeyer;N. Meric;P. Mermod;L. Merola;C. Meroni;F. S. Merritt;H. Merritt;A. Messina;J. Metcalfe;A. S. Mete;C. Meyer;C. Meyer;J-P. Meyer;J. Meyer;R. P. Middleton;S. Migas;L. Mijović;G. Mikenberg;M. Mikestikova;M. Mikuž;A. Milic;D. W. Miller;C. Mills;A. Milov;D. A. Milstead;D. Milstein;A. A. Minaenko;I. A. Minashvili;A. I. Mincer;B. Mindur;M. Mineev;Y. Ming;L. M. Mir;G. Mirabelli;T. Mitani;J. Mitrevski;V. A. Mitsou;S. Mitsui;A. Miucci;P. S. Miyagawa;J. U. Mjörnmark;T. Moa;K. Mochizuki;S. Mohapatra;W. Mohr;S. Molander;R. Moles-Valls;K. Mönig;C. Monini;J. Monk;E. Monnier;J. Montejo Berlingen;F. Monticelli;S. Monzani;R. W. Moore;A. Moraes;N. Morange;D. Moreno;M. Moreno Llácer;P. Morettini;M. Morgenstern;M. Morii;S. Moritz;A. K. Morley;G. Mornacchi;J. D. Morris;L. Morvaj;H. G. Moser;M. Mosidze;J. Moss;K. Motohashi;R. Mount;E. Mountricha;S. V. Mouraviev;E. J. W. Moyse;S. Muanza;R. D. Mudd;F. Mueller;J. Mueller;K. Mueller;T. Mueller;T. Mueller;D. Muenstermann;Y. Munwes;J. A. Murillo Quijada;W. J. Murray;H. Musheghyan;E. Musto;A. G. Myagkov;M. Myska;O. Nackenhorst;J. Nadal;K. Nagai;R. Nagai;Y. Nagai;K. Nagano;A. Nagarkar;Y. Nagasaka;M. Nagel;A. M. Nairz;Y. Nakahama;K. Nakamura;T. Nakamura;I. Nakano;H. Namasivayam;G. Nanava;R. Narayan;T. Nattermann;T. Naumann;G. Navarro;R. Nayyar;H. A. Neal;P. Yu. Nechaeva;T. J. Neep;P. D. Nef;A. Negri;G. Negri;M. Negrini;S. Nektarijevic;A. Nelson;T. K. Nelson;S. Nemecek;P. Nemethy;A. A. Nepomuceno;M. Nessi;M. S. Neubauer;M. Neumann;R. M. Neves;P. Nevski;P. R. Newman;D. H. Nguyen;R. B. Nickerson;R. Nicolaidou;B. Nicquevert;J. Nielsen;N. Nikiforou;A. Nikiforov;V. Nikolaenko;I. Nikolic-Audit;K. Nikolics;K. Nikolopoulos;P. Nilsson;Y. Ninomiya;A. Nisati;R. Nisius;T. Nobe;L. Nodulman;M. Nomachi;I. Nomidis;S. Norberg;M. Nordberg;O. Novgorodova;S. Nowak;M. Nozaki;L. Nozka;K. Ntekas;G. Nunes Hanninger;T. Nunnemann;E. Nurse;F. Nuti;B. J. O’Brien;F. O’Grady;D. C. O’Neil;V. O’Shea;F. G. Oakham;H. Oberlack;T. Obermann;J. Ocariz;A. Ochi;M. I. Ochoa;S. Oda;S. Odaka;H. Ogren;A. Oh;S. H. Oh;C. C. Ohm;H. Ohman;W. Okamura;H. Okawa;Y. Okumura;T. Okuyama;A. Olariu;A. G. Olchevski;S. A. Olivares Pino;D. Oliveira Damazio;E. Oliver Garcia;A. Olszewski;J. Olszowska;A. Onofre;P. U. E. Onyisi;C. J. Oram;M. J. Oreglia;Y. Oren;D. Orestano;N. Orlando;C. Oropeza Barrera;R. S. Orr;B. Osculati;R. Ospanov;G. Otero y Garzon;H. Otono;M. Ouchrif;E. A. Ouellette;F. Ould-Saada;A. Ouraou;K. P. Oussoren;Q. Ouyang;A. Ovcharova;M. Owen;V. E. Ozcan;N. Ozturk;K. Pachal;A. Pacheco Pages;C. Padilla Aranda;M. Pagáčová;S. Pagan Griso;E. Paganis;C. Pahl;F. Paige;P. Pais;K. Pajchel;G. Palacino;S. Palestini;M. Palka;D. Pallin;A. Palma;J. D. Palmer;Y. B. Pan;E. Panagiotopoulou;J. G. Panduro Vazquez;P. Pani;N. Panikashvili;S. Panitkin;D. Pantea;L. Paolozzi;Th. D. Papadopoulou;K. Papageorgiou;A. Paramonov;D. Paredes Hernandez;M. A. Parker;F. Parodi;J. A. Parsons;U. Parzefall;E. Pasqualucci;S. Passaggio;A. Passeri;F. Pastore;Fr. Pastore;G. Pásztor;S. Pataraia;N. D. Patel;J. R. Pater;S. Patricelli;T. Pauly;J. Pearce;M. Pedersen;S. Pedraza Lopez;R. Pedro;S. V. Peleganchuk;D. Pelikan;H. Peng;B. Penning;J. Penwell;D. V. Perepelitsa;E. Perez Codina;M. T. Pérez García-Estañ;V. Perez Reale;L. Perini;H. Pernegger;R. Perrino;R. Peschke;V. D. Peshekhonov;K. Peters;R. F. Y. Peters;B. A. Petersen;T. C. Petersen;E. Petit;A. Petridis;C. Petridou;E. Petrolo;F. Petrucci;N. E. Pettersson;R. Pezoa;P. W. Phillips;G. Piacquadio;E. Pianori;A. Picazio;E. Piccaro;M. Piccinini;R. Piegaia;D. T. Pignotti;J. E. Pilcher;A. D. Pilkington;J. Pina;M. Pinamonti;A. Pinder;J. L. Pinfold;A. Pingel;B. Pinto;S. Pires;M. Pitt;C. Pizio;L. Plazak;M. -A. Pleier;V. Pleskot;E. Plotnikova;P. Plucinski;S. Poddar;F. Podlyski;R. Poettgen;L. Poggioli;D. Pohl;M. Pohl;G. Polesello;A. Policicchio;R. Polifka;A. Polini;C. S. Pollard;V. Polychronakos;K. Pommès;L. Pontecorvo;B. G. Pope;G. A. Popeneciu;D. S. Popovic;A. Poppleton;X. Portell Bueso;S. Pospisil;K. Potamianos;I. N. Potrap;C. J. Potter;C. T. Potter;G. Poulard;J. Poveda;V. Pozdnyakov;P. Pralavorio;A. Pranko;S. Prasad;R. Pravahan;S. Prell;D. Price;J. Price;L. E. Price;D. Prieur;M. Primavera;M. Proissl;K. Prokofiev;F. Prokoshin;E. Protopapadaki;S. Protopopescu;J. Proudfoot;M. Przybycien;H. Przysiezniak;E. Ptacek;D. Puddu;E. Pueschel;D. Puldon;M. Purohit;P. Puzo;J. Qian;G. Qin;Y. Qin;A. Quadt;D. R. Quarrie;W. B. Quayle;M. Queitsch-Maitland;D. Quilty;A. Qureshi;V. Radeka;V. Radescu;S. K. Radhakrishnan;P. Radloff;P. Rados;F. Ragusa;G. Rahal;S. Rajagopalan;M. Rammensee;A. S. Randle-Conde;C. Rangel-Smith;K. Rao;F. Rauscher;T. C. Rave;T. Ravenscroft;M. Raymond;A. L. Read;N. P. Readioff;D. M. Rebuzzi;A. Redelbach;G. Redlinger;R. Reece;K. Reeves;L. Rehnisch;H. Reisin;M. Relich;C. Rembser;H. Ren;Z. L. Ren;A. Renaud;M. Rescigno;S. Resconi;O. L. Rezanova;P. Reznicek;R. Rezvani;R. Richter;M. Ridel;P. Rieck;J. Rieger;M. Rijssenbeek;A. Rimoldi;L. Rinaldi;E. Ritsch;I. Riu;F. Rizatdinova;E. Rizvi;S. H. Robertson;A. Robichaud-Veronneau;D. Robinson;J. E. M. Robinson;A. Robson;C. Roda;L. Rodrigues;S. Roe;O. Røhne;S. Rolli;A. Romaniouk;M. Romano;E. Romero Adam;N. Rompotis;M. Ronzani;L. Roos;E. Ros;S. Rosati;K. Rosbach;M. Rose;P. Rose;P. L. Rosendahl;O. Rosenthal;V. Rossetti;E. Rossi;L. P. Rossi;R. Rosten;M. Rotaru;I. Roth;J. Rothberg;D. Rousseau;C. R. Royon;A. Rozanov;Y. Rozen;X. Ruan;F. Rubbo;I. Rubinskiy;V. I. Rud;C. Rudolph;M. S. Rudolph;F. Rühr;A. Ruiz-Martinez;Z. Rurikova;N. A. Rusakovich;A. Ruschke;J. P. Rutherfoord;N. Ruthmann;Y. F. Ryabov;M. Rybar;G. Rybkin;N. C. Ryder;A. F. Saavedra;S. Sacerdoti;A. Saddique;I. Sadeh;H. F-W. Sadrozinski;R. Sadykov;F. Safai Tehrani;H. Sakamoto;Y. Sakurai;G. Salamanna;A. Salamon;M. Saleem;D. Salek;P. H. Sales De Bruin;D. Salihagic;A. Salnikov;J. Salt;D. Salvatore;F. Salvatore;A. Salvucci;A. Salzburger;D. Sampsonidis;A. Sanchez;J. Sánchez;V. Sanchez Martinez;H. Sandaker;R. L. Sandbach;H. G. Sander;M. P. Sanders;M. Sandhoff;T. Sandoval;C. Sandoval;R. Sandstroem;D. P. C. Sankey;A. Sansoni;C. Santoni;R. Santonico;H. Santos;I. Santoyo Castillo;K. Sapp;A. Sapronov;J. G. Saraiva;B. Sarrazin;G. Sartisohn;O. Sasaki;Y. Sasaki;G. Sauvage;E. Sauvan;P. Savard;D. O. Savu;C. Sawyer;L. Sawyer;D. H. Saxon;J. Saxon;C. Sbarra;A. Sbrizzi;T. Scanlon;D. A. Scannicchio;M. Scarcella;V. Scarfone;J. Schaarschmidt;P. Schacht;D. Schaefer;R. Schaefer;S. Schaepe;S. Schaetzel;U. Schäfer;A. C. Schaffer;D. Schaile;R. D. Schamberger;V. Scharf;V. A. Schegelsky;D. Scheirich;M. Schernau;M. I. Scherzer;C. Schiavi;J. Schieck;C. Schillo;M. Schioppa;S. Schlenker;E. Schmidt;K. Schmieden;C. Schmitt;C. Schmitt;S. Schmitt;B. Schneider;Y. J. Schnellbach;U. Schnoor;L. Schoeffel;A. 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2014-01-01
Abstract
The inclusive top quark pair (tt¯tt¯) production cross-section σtt¯σtt¯ has been measured in proton–proton collisions at s√=7 TeVs=7 TeV and s√=8 TeVs=8 TeV with the ATLAS experiment at the LHC, using tt¯tt¯ events with an opposite-charge eμeμ pair in the final state. The measurement was performed with the 2011 7 TeV dataset corresponding to an integrated luminosity of 4.6 fb−1fb−1 and the 2012 8 TeV dataset of 20.3 fb−1fb−1. The numbers of events with exactly one and exactly two bb-tagged jets were counted and used to simultaneously determine σtt¯σtt¯ and the efficiency to reconstruct and bb-tag a jet from a top quark decay, thereby minimising the associated systematic uncertainties. The cross-section was measured to be: σtt¯σtt¯=182.9±3.1±4.2±3.6±3.3 pb (s√=7 TeV)and=242.4±1.7±5.5±7.5±4.2 pb (s√=8 TeV), σtt¯=182.9±3.1±4.2±3.6±3.3 pb (s=7 TeV)andσtt¯=242.4±1.7±5.5±7.5±4.2 pb (s=8 TeV), where the four uncertainties arise from data statistics, experimental and theoretical systematic effects, knowledge of the integrated luminosity and of the LHC beam energy. The results are consistent with recent theoretical QCD calculations at next-to-next-to-leading order. Fiducial measurements corresponding to the experimental acceptance of the leptons are also reported, together with the ratio of cross-sections measured at the two centre-of-mass energies. The inclusive cross-section results were used to determine the top quark pole mass via the dependence of the theoretically predicted cross-section on mpoletmtpole giving a result of mpoletmtpole=172.9+2.5−2.6=172.9−2.6+2.5 GeV. By looking for an excess of tt¯tt¯ production with respect to the QCD prediction, the results were also used to place limits on the pair-production of supersymmetric top squarks t~1t~1 with masses close to the top quark mass, decaying via t~1→tχ~01t~1→tχ~10 to predominantly right-handed top quarks and a light neutralino χ~01χ~10, the lightest supersymmetric particle. Top squarks with masses between the top quark mass and 177 GeV are excluded at the 95 % confidence level.
Aad, G., Abbott, B., Abdallah, J., Abdel Khalek, S., Abdinov, O., Aben, R., et al. (2014). Measurement of the t(t)over-bar production cross-section using e mu events with b-tagged jets in pp collisions at root s=7 and 8 TeV with the ATLAS detector. THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS, 74(10), 1-32 [10.1140/epjc/s10052-014-3109-7].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11590/120496
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