Spin correlations and polarization in the top quark–antiquark system are measured using dilepton final states produced in pp collisions at the LHC at sqrt(s)= 7 TeV. The data correspond to an integrated luminosity of 5.0 fb−1 collected with the CMS detector. The measurements are performed using events with two oppositely charged leptons (electrons or muons), a significant imbalance in transverse momentum, and two or more jets, where at least one of the jets is identified as originating from a b quark. The spin correlations and polarization are measured through asymmetries in angular distributions of the two selected leptons, unfolded to the parton level. All measurements are found to be in agreement with predictions of the standard model.
Measurements of tt(bar) Spin Correlations and Top-Quark Polarization Using Dilepton Final States in pp Collisions at $\sqrt{s}$ = 7 TeV / S. Chatrchyan;V. Khachatryan;A. M. Sirunyan;A. Tumasyan;W. Adam;T. Bergauer;M. Dragicevic;J. Erö;C. Fabjan;M. Friedl;R. Frühwirth;V. M. Ghete;C. Hartl;N. Hörmann;J. Hrubec;M. Jeitler;W. Kiesenhofer;V. Knünz;M. Krammer;I. Krätschmer;D. Liko;I. Mikulec;D. Rabady;B. Rahbaran;H. Rohringer;R. Schöfbeck;J. Strauss;A. Taurok;W. Treberer-Treberspurg;W. Waltenberger;C.-E. Wulz;V. Mossolov;N. Shumeiko;J. Suarez Gonzalez;S. Alderweireldt;M. Bansal;S. Bansal;T. Cornelis;E. A. De Wolf;X. Janssen;A. Knutsson;S. Luyckx;L. Mucibello;S. Ochesanu;B. Roland;R. Rougny;H. Van Haevermaet;P. Van Mechelen;N. Van Remortel;A. Van Spilbeeck;F. Blekman;S. Blyweert;J. D’Hondt;N. Heracleous;A. Kalogeropoulos;J. Keaveney;T. J. Kim;S. Lowette;M. Maes;A. Olbrechts;D. Strom;S. Tavernier;W. Van Doninck;P. Van Mulders;G. P. Van Onsem;I. Villella;C. Caillol;B. Clerbaux;G. De Lentdecker;L. Favart;A. P. R. Gay;T. Hreus;A. Léonard;P. E. Marage;A. Mohammadi;L. Perniè;T. Reis;T. Seva;L. Thomas;C. Vander Velde;P. Vanlaer;J. Wang;V. Adler;K. Beernaert;L. Benucci;A. Cimmino;S. Costantini;S. Dildick;G. Garcia;B. Klein;J. Lellouch;J. Mccartin;A. A. Ocampo Rios;D. Ryckbosch;M. Sigamani;N. Strobbe;F. Thyssen;M. Tytgat;S. Walsh;E. Yazgan;N. Zaganidis;S. Basegmez;C. Beluffi;G. Bruno;R. Castello;A. Caudron;L. Ceard;G. G. Da Silveira;C. Delaere;T. du Pree;D. Favart;L. Forthomme;A. Giammanco;J. Hollar;P. Jez;M. Komm;V. Lemaitre;J. Liao;O. Militaru;C. Nuttens;D. Pagano;A. Pin;K. Piotrzkowski;A. Popov;L. Quertenmont;M. Selvaggi;M. Vidal Marono;J. M. Vizan Garcia;N. Beliy;T. Caebergs;E. Daubie;G. H. Hammad;G. A. Alves;M. Correa Martins Junior;T. Martins;M. E. Pol;M. H. G. Souza;W. L. Aldá Júnior;W. Carvalho;J. Chinellato;A. Custódio;E. M. Da Costa;D. De Jesus Damiao;C. De Oliveira Martins;S. Fonseca De Souza;H. Malbouisson;M. Malek;D. Matos Figueiredo;L. Mundim;H. Nogima;W. L. Prado Da Silva;J. Santaolalla;A. Santoro;A. Sznajder;E. J. Tonelli Manganote;A. Vilela Pereira;C. A. Bernardes;F. A. Dias;T. R. Fernandez Perez Tomei;E. M. Gregores;C. Lagana;P. G. Mercadante;S. F. Novaes;Sandra S. Padula;V. Genchev;P. Iaydjiev;A. Marinov;S. Piperov;M. Rodozov;G. Sultanov;M. Vutova;A. Dimitrov;I. Glushkov;R. Hadjiiska;V. Kozhuharov;L. Litov;B. Pavlov;P. Petkov;J. G. Bian;G. M. Chen;H. S. Chen;M. Chen;R. Du;C. H. Jiang;D. Liang;S. Liang;X. Meng;R. Plestina;J. Tao;X. Wang;Z. Wang;C. Asawatangtrakuldee;Y. Ban;Y. Guo;Q. Li;W. Li;S. Liu;Y. Mao;S. J. Qian;D. Wang;L. Zhang;W. Zou;C. Avila;C. A. Carrillo Montoya;L. F. Chaparro Sierra;C. Florez;J. P. Gomez;B. Gomez Moreno;J. C. Sanabria;N. Godinovic;D. Lelas;D. Polic;I. Puljak;Z. Antunovic;M. Kovac;V. Brigljevic;K. Kadija;J. Luetic;D. Mekterovic;S. Morovic;L. Tikvica;A. Attikis;G. Mavromanolakis;J. Mousa;C. Nicolaou;F. Ptochos;P. A. Razis;M. Finger;M. Finger;A. A. Abdelalim;Y. Assran;S. Elgammal;A. Ellithi Kamel;M. A. Mahmoud;A. Radi;M. Kadastik;M. Müntel;M. Murumaa;M. Raidal;L. Rebane;A. Tiko;P. Eerola;G. Fedi;M. Voutilainen;J. Härkönen;V. Karimäki;R. Kinnunen;M. J. Kortelainen;T. Lampén;K. Lassila-Perini;S. Lehti;T. Lindén;P. Luukka;T. Mäenpää;T. Peltola;E. Tuominen;J. Tuominiemi;E. Tuovinen;L. Wendland;T. Tuuva;M. Besancon;F. Couderc;M. Dejardin;D. Denegri;B. Fabbro;J. L. Faure;F. Ferri;S. Ganjour;A. Givernaud;P. Gras;G. Hamel de Monchenault;P. Jarry;E. Locci;J. Malcles;A. Nayak;J. Rander;A. Rosowsky;M. Titov;S. Baffioni;F. Beaudette;P. Busson;C. Charlot;N. Daci;T. Dahms;M. Dalchenko;L. Dobrzynski;A. Florent;R. Granier de Cassagnac;M. Haguenauer;P. Miné;C. Mironov;I. N. Naranjo;M. Nguyen;C. Ochando;P. Paganini;D. Sabes;R. Salerno;Y. Sirois;C. Veelken;Y. Yilmaz;A. Zabi;J.-L. Agram;J. Andrea;D. Bloch;J.-M. Brom;E. C. Chabert;C. Collard;E. Conte;F. Drouhin;J.-C. Fontaine;D. Gelé;U. Goerlach;C. Goetzmann;P. Juillot;A.-C. Le Bihan;P. Van Hove;S. Gadrat;S. Beauceron;N. Beaupere;G. Boudoul;S. Brochet;J. Chasserat;R. Chierici;D. Contardo;P. Depasse;H. El Mamouni;J. Fan;J. Fay;S. Gascon;M. Gouzevitch;B. Ille;T. Kurca;M. Lethuillier;L. Mirabito;S. Perries;J. D. Ruiz Alvarez;L. Sgandurra;V. Sordini;M. Vander Donckt;P. Verdier;S. Viret;H. Xiao;Z. Tsamalaidze;C. Autermann;S. Beranek;M. Bontenackels;B. Calpas;M. Edelhoff;L. Feld;O. Hindrichs;K. Klein;A. Ostapchuk;A. Perieanu;F. Raupach;J. Sammet;S. Schael;D. Sprenger;H. Weber;B. Wittmer;V. Zhukov;M. Ata;J. Caudron;E. Dietz-Laursonn;D. Duchardt;M. Erdmann;R. Fischer;A. Güth;T. Hebbeker;C. Heidemann;K. Hoepfner;D. Klingebiel;S. Knutzen;P. Kreuzer;M. Merschmeyer;A. Meyer;M. Olschewski;K. Padeken;P. Papacz;H. Reithler;S. A. Schmitz;L. Sonnenschein;D. Teyssier;S. Thüer;M. Weber;V. Cherepanov;Y. Erdogan;G. Flügge;H. Geenen;M. Geisler;W. Haj Ahmad;F. Hoehle;B. Kargoll;T. Kress;Y. Kuessel;J. Lingemann;A. Nowack;I. M. Nugent;L. Perchalla;O. Pooth;A. Stahl;I. Asin;N. Bartosik;J. Behr;W. Behrenhoff;U. Behrens;A. J. Bell;M. 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Schmidt;M. Seidel;J. Sibille;V. Sola;H. Stadie;G. Steinbrück;D. Troendle;E. Usai;L. Vanelderen;C. Barth;C. Baus;J. Berger;C. Böser;E. Butz;T. Chwalek;W. De Boer;A. Descroix;A. Dierlamm;M. Feindt;M. Guthoff;F. Hartmann;T. Hauth;H. Held;K. H. Hoffmann;U. Husemann;I. Katkov;A. Kornmayer;E. Kuznetsova;P. Lobelle Pardo;D. Martschei;M. U. Mozer;Th. Müller;M. Niegel;A. Nürnberg;O. Oberst;G. Quast;K. Rabbertz;F. Ratnikov;S. Röcker;F.-P. Schilling;G. Schott;H. J. Simonis;F. M. Stober;R. Ulrich;J. Wagner-Kuhr;S. Wayand;T. Weiler;R. Wolf;M. Zeise;G. Anagnostou;G. Daskalakis;T. Geralis;S. Kesisoglou;A. Kyriakis;D. Loukas;A. Markou;C. Markou;E. Ntomari;I. Topsis-giotis;L. Gouskos;A. Panagiotou;N. Saoulidou;E. Stiliaris;X. Aslanoglou;I. Evangelou;G. Flouris;C. Foudas;P. Kokkas;N. Manthos;I. Papadopoulos;E. Paradas;G. Bencze;C. Hajdu;P. Hidas;D. Horvath;F. Sikler;V. Veszpremi;G. Vesztergombi;A. J. Zsigmond;N. Beni;S. Czellar;J. Molnar;J. Palinkas;Z. Szillasi;J. Karancsi;P. Raics;Z. L. Trocsanyi;B. Ujvari;S. K. Swain;S. B. Beri;V. Bhatnagar;N. Dhingra;R. Gupta;M. Kaur;M. Z. Mehta;M. Mittal;N. Nishu;A. Sharma;J. B. Singh;Ashok Kumar;Arun Kumar;S. Ahuja;A. Bhardwaj;B. C. Choudhary;A. Kumar;S. Malhotra;M. Naimuddin;K. Ranjan;P. Saxena;V. Sharma;R. K. Shivpuri;S. Banerjee;S. Bhattacharya;K. Chatterjee;S. Dutta;B. Gomber;Sa. Jain;Sh. Jain;R. Khurana;A. Modak;S. Mukherjee;D. Roy;S. Sarkar;M. Sharan;A. P. Singh;A. Abdulsalam;D. Dutta;S. Kailas;V. Kumar;A. K. Mohanty;L. M. Pant;P. Shukla;A. Topkar;T. Aziz;R. M. Chatterjee;S. Ganguly;S. Ghosh;M. Guchait;A. Gurtu;G. Kole;S. Kumar;M. Maity;G. Majumder;K. Mazumdar;G. B. Mohanty;B. Parida;K. Sudhakar;N. Wickramage;S. Banerjee;S. Dugad;H. Arfaei;H. Bakhshiansohi;H. Behnamian;S. M. Etesami;A. Fahim;A. Jafari;M. Khakzad;M. Mohammadi Najafabadi;M. Naseri;S. Paktinat Mehdiabadi;B. Safarzadeh;M. Zeinali;M. Grunewald;M. Abbrescia;L. Barbone;C. Calabria;S. S. Chhibra;A. Colaleo;D. Creanza;N. De Filippis;M. De Palma;L. Fiore;G. Iaselli;G. Maggi;M. Maggi;B. Marangelli;S. My;S. Nuzzo;N. Pacifico;A. Pompili;G. Pugliese;R. Radogna;G. Selvaggi;L. Silvestris;G. Singh;R. Venditti;P. Verwilligen;G. Zito;G. Abbiendi;A. C. Benvenuti;D. Bonacorsi;S. Braibant-Giacomelli;L. Brigliadori;R. Campanini;P. Capiluppi;A. Castro;F. R. Cavallo;G. Codispoti;M. Cuffiani;G. M. Dallavalle;F. Fabbri;A. Fanfani;D. Fasanella;P. Giacomelli;C. Grandi;L. Guiducci;S. Marcellini;G. Masetti;M. Meneghelli;A. Montanari;F. L. Navarria;F. Odorici;A. Perrotta;F. Primavera;A. M. Rossi;T. Rovelli;G. P. Siroli;N. Tosi;R. Travaglini;S. Albergo;G. Cappello;M. Chiorboli;S. Costa;F. Giordano;R. Potenza;A. Tricomi;C. Tuve;G. Barbagli;V. Ciulli;C. Civinini;R. D’Alessandro;E. Focardi;E. Gallo;S. Gonzi;V. Gori;P. Lenzi;M. Meschini;S. Paoletti;G. Sguazzoni;A. Tropiano;L. Benussi;S. Bianco;F. Fabbri;D. Piccolo;P. Fabbricatore;R. Ferretti;F. Ferro;M. Lo Vetere;R. Musenich;E. Robutti;S. Tosi;A. Benaglia;M. E. Dinardo;S. Fiorendi;S. Gennai;A. Ghezzi;P. Govoni;M. T. Lucchini;S. Malvezzi;R. A. Manzoni;A. Martelli;D. Menasce;L. Moroni;M. Paganoni;D. Pedrini;S. Ragazzi;N. Redaelli;T. Tabarelli de Fatis;S. Buontempo;N. Cavallo;F. Fabozzi;A. O. M. Iorio;L. Lista;S. Meola;M. Merola;P. Paolucci;P. Azzi;N. Bacchetta;M. Bellato;D. Bisello;A. Branca;R. Carlin;P. Checchia;T. Dorigo;U. Dosselli;M. Galanti;F. Gasparini;U. Gasparini;P. Giubilato;A. Gozzelino;K. Kanishchev;S. Lacaprara;I. Lazzizzera;M. Margoni;A. T. Meneguzzo;J. Pazzini;M. Pegoraro;N. Pozzobon;P. Ronchese;F. Simonetto;E. Torassa;M. Tosi;A. Triossi;P. Zotto;A. Zucchetta;G. Zumerle;M. Gabusi;S. P. Ratti;C. Riccardi;P. Vitulo;M. Biasini;G. M. Bilei;L. Fanò;P. Lariccia;G. Mantovani;M. Menichelli;A. Nappi;F. Romeo;A. Saha;A. Santocchia;A. Spiezia;K. Androsov;P. Azzurri;G. Bagliesi;J. Bernardini;T. Boccali;G. Broccolo;R. Castaldi;M. A. Ciocci;R. Dell’Orso;F. Fiori;L. Foà;A. Giassi;M. T. Grippo;A. Kraan;F. Ligabue;T. Lomtadze;L. Martini;A. Messineo;C. S. Moon;F. Palla;A. Rizzi;A. Savoy-Navarro;A. T. Serban;P. Spagnolo;P. Squillacioti;R. Tenchini;G. Tonelli;A. Venturi;P. G. Verdini;C. Vernieri;L. Barone;F. Cavallari;D. Del Re;M. Diemoz;M. Grassi;C. Jorda;E. Longo;F. Margaroli;P. Meridiani;F. Micheli;S. Nourbakhsh;G. Organtini;R. Paramatti;S. Rahatlou;C. Rovelli;L. Soffi;P. Traczyk;N. Amapane;R. Arcidiacono;S. Argiro;M. Arneodo;R. Bellan;C. Biino;N. Cartiglia;S. Casasso;M. Costa;A. Degano;N. Demaria;C. Mariotti;S. Maselli;E. Migliore;V. Monaco;M. Musich;M. M. Obertino;G. Ortona;L. Pacher;N. Pastrone;M. Pelliccioni;A. Potenza;A. Romero;M. Ruspa;R. Sacchi;A. Solano;A. Staiano;U. Tamponi;S. Belforte;V. Candelise;M. Casarsa;F. Cossutti;G. Della Ricca;B. Gobbo;C. La Licata;M. Marone;D. Montanino;A. Penzo;A. Schizzi;T. Umer;A. Zanetti;S. Chang;T. Y. Kim;S. K. Nam;D. H. Kim;G. N. Kim;J. E. Kim;D. J. Kong;S. Lee;Y. D. Oh;H. Park;D. C. Son;J. Y. Kim;Zero J. Kim;S. Song;S. Choi;D. Gyun;B. Hong;M. Jo;H. Kim;Y. Kim;K. S. Lee;S. K. Park;Y. Roh;M. Choi;J. H. Kim;C. Park;I. C. Park;S. Park;G. Ryu;Y. 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Measurements of tt(bar) Spin Correlations and Top-Quark Polarization Using Dilepton Final States in pp Collisions at $\sqrt{s}$ = 7 TeV
BONACORSI, DANIELE;BRAIBANT, SYLVIE;BRIGLIADORI, LUCA;CAMPANINI, RENATO;CAPILUPPI, PAOLO;CASTRO, ANDREA;CODISPOTI, GIUSEPPE;CUFFIANI, MARCO;FANFANI, ALESSANDRA;FASANELLA, DANIELE;GUIDUCCI, LUIGI;MENEGHELLI, MARCO;PRIMAVERA, FEDERICA;ROVELLI, TIZIANO;SIROLI, GIAN PIERO;TOSI, NICOLÒ;
2014
Abstract
Spin correlations and polarization in the top quark–antiquark system are measured using dilepton final states produced in pp collisions at the LHC at sqrt(s)= 7 TeV. The data correspond to an integrated luminosity of 5.0 fb−1 collected with the CMS detector. The measurements are performed using events with two oppositely charged leptons (electrons or muons), a significant imbalance in transverse momentum, and two or more jets, where at least one of the jets is identified as originating from a b quark. The spin correlations and polarization are measured through asymmetries in angular distributions of the two selected leptons, unfolded to the parton level. All measurements are found to be in agreement with predictions of the standard model.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.