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A measurement of the W boson helicity is presented, where the W boson originates from the decay of a top quark produced in pp collisions. The event selection, optimized for reconstructing a single top quark in the final state, requires exactly one isolated lepton (muon or electron) and exactly two jets, one of which is likely to originate from the hadronization of a bottom quark. The analysis is performed using data recorded at a center-of-mass energy of 8 TeV with the CMS detector at the CERN LHC in 2012. The data sample corresponds to an integrated luminosity of 19.7 fb(-1). The measured helicity fractions are F-L = 0.298 +/- 0.028 (stat) +/- 0.032(syst), F-0 = 0.720 +/- 0.039 (stat) +/- 0.037(syst), and F-R = -0.018 +/- 0.019 (stat) +/- 0.011(syst). These results are used to set limits on the real part of the tWb anomalous couplings, g(L) and g(R).
Measurement of the W boson helicity in events with a single reconstructed top quark in p p collisions at root s=8 TeV
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Coughlan;K. Harder;S. Harper;E. Olaiya;D. Petyt;C. H. Shepherd Themistocleous;A. Thea;I. R. Tomalin;W. J. Womersley;S. D. Worm;M. Baber;R. Bainbridge;O. Buchmuller;D. Burton;D. Colling;N. Cripps;M. Cutajar;P. Dauncey;G. Davies;M. D. Negra;P. Dunne;W. Ferguson;J. Fulcher;D. Futyan;G. Hall;G. Iles;M. Jarvis;G. Karapostoli;M. Kenzie;R. Lane;R. Lucas;L. Lyons;A. . . M.;S. Malik;B. Mathias;J. Nash;A. Nikitenko;J. Pela;M. Pesaresi;K. Petridis;D. M. Raymond;S. Rogerson;A. Rose;C. Seez;P. Sharp;A. Tapper;M. V. Acosta;T. Virdee;S. C. Zenz;J. E. Cole;P. R. Hobson;A. Khan;P. Kyberd;D. Leggat;D. Leslie;I. D. Reid;P. Symonds;L. Teodorescu;M. Turner;J. Dittmann;K. Hatakeyama;A. Kasmi;H. Liu;T. Scarborough;O. Charaf;S. I. Cooper;C. Henderson;P. Rumerio;A. Avetisyan;T. Bose;C. Fantasia;P. Lawson;C. Richardson;J. Rohlf;J. S. John;L. Sulak;J. Alimena;E. Berry;S. Bhattacharya;G. Christopher;D. Cutts;Z. Demiragli;N. Dhingra;A. Ferapontov;A. Garabedian;U. Heintz;G. Kukartsev;E. Laird;G. Landsberg;M. Luk;M. Narain;M. Segala;T. Sinthuprasith;T. Speer;J. Swanson;R. Breedon;G. Breto;M. C. De;S. Chauhan;M. Chertok;J. Conway;R. Conway;P. T. Cox;R. Erbacher;M. Gardner;W. Ko;R. Lander;T. Miceli;M. Mulhearn;D. Pellett;J. Pilot;F. Ricci Tam;M. Searle;S. Shalhout;J. Smith;M. Squires;D. Stolp;M. Tripathi;S. Wilbur;R. Yohay;R. Cousins;P. Everaerts;C. Farrell;J. Hauser;M. Ignatenko;G. Rakness;E. Takasugi;V. Valuev;M. Weber;K. Burt;R. Clare;J. Ellison;J. W. Gary;G. Hanson;J. Heilman;M. I. Rikova;P. Jandir;E. Kennedy;F. Lacroix;O. R. Long;A. Luthra;M. Malberti;M. O. Negrete;A. Shrinivas;S. Sumowidagdo;S. Wimpenny;J. G. Branson;G. B. Cerati;S. Cittolin;R. T. D'Agnolo;A. Holzner;R. Kelley;D. Klein;J. Letts;I. Macneill;D. Olivito;S. Padhi;C. Palmer;M. Pieri;M. Sani;V. Sharma;S. Simon;E. Sudano;M. Tadel;Y. Tu;A. Vartak;C. Welke;F. Wuerthwein;A. Yagil;D. Barge;J. Bradmiller Feld;C. Campagnari;T. Danielson;A. Dishaw;V. Dutta;K. Flowers;M. F. Sevilla;P. Geffert;C. George;F. Golf;L. Gouskos;J. Incandela;C. Justus;N. Mccoll;J. Richman;D. Stuart;W. To;C. West;J. Yoo;A. Apresyan;A. Bornheim;J. Bunn;Y. Chen;J. Duarte;A. Mott;H. B. Newman;C. Pena;C. Rogan;M. Spiropulu;V. Timciuc;J. R. Vlimant;R. Wilkinson;S. Xie;R. Y. Zhu;V. Azzolini;A. Calamba;B. Carlson;T. Ferguson;Y. Iiyama;M. Paulini;J. Russ;H. Vogel;I. Vorobiev;J. P. Cumalat;W. T. Ford;A. Gaz;M. Krohn;E. L. Lopez;U. Nauenberg;J. G. Smith;K. Stenson;K. A. Ulmer;S. R. Wagner;J. Alexander;A. Chatterjee;J. Chaves;J. Chu;S. Dittmer;N. Eggert;N. Mirman;G. N. Kaufman;J. R. Patterson;A. Ryd;E. Salvati;L. Skinnari;W. Sun;W. D. Teo;J. Thom;J. Thompson;J. Tucker;Y. Weng;L. Winstrom;P. Wittich;D. Winn;S. Abdullin;M. Albrow;J. Anderson;G. Apollinari;L. A. T.;A. Beretvas;J. Berryhill;P. C. Bhat;G. Bolla;K. Burkett;J. N. Butler;H. W. K.;F. Chlebana;S. Cihangir;V. D. Elvira;I. Fisk;J. Freeman;Y. Gao;E. Gottschalk;L. Gray;D. Green;S. Gruenendahl;O. Gutsche;J. Hanlon;D. Hare;R. M. Harris;J. Hirschauer;B. Hooberman;S. Jindariani;M. Johnson;U. Joshi;K. Kaadze;B. Klima;B. Kreis;S. Kwant;J. Linacre;D. Lincoln;R. Lipton;T. Liu;J. Lykken;K. Maeshima;J. M. Marraffino;V. I. Martinez;S. Maruyama;D. Mason;P. McBride;P. Merkel;K. Mishra;S. Mrenna;Y. Musienko;S. Nahn;C. Newman Holmes;V. O'Dell;O. Prokofyev;E. Sexton Kennedy;S. Sharma;A. Soha;W. J. Spalding;L. Spiegel;L. Taylor;S. Tkaczyk;N. V. Tran;L. Uplegger;E. W. Vaandering;R. Vidal;A. Whitbeck;J. Whitmore;F. Yang;D. Acosta;P. Avery;P. Bortignon;D. Bourilkov;M. Carver;D. Curry;S. Das;M. D. Gruttola;G. P. Di;R. D. Field;M. Fisher;I. K. Furic;J. Hugon;J. Konigsberg;A. Korytov;T. Kypreos;J. F. Low;K. Matchev;H. Mei;P. Milenovic;G. Mitselmakher;L. Muniz;A. Rinkevicius;L. Shchutska;M. Snowball;D. Sperka;J. Yelton;M. Zakaria;S. Hewamanage;S. Linn;P. Markowitz;G. Martinez;J. L. Rodriguez;T. Adams;A. Askew;J. Bochenek;B. Diamond;J. Haas;S. Hagopian;V. Hagopian;K. F. Johnson;H. Prosper;V. Veeraraghavan;M. Weinberg;M. M. Baarmand;M. Hohlmann;H. Kalakhety;F. Yumiceva;M. R. Adams;L. Apanasevich;D. Berry;R. R. Betts;I. Bucinskaite;R. Cavanaugh;O. Evdokimov;L. Gauthier;C. E. Gerber;D. J. Hofman;P. Kurt;D. H. Moon;C. O'Brien;I. D. Sandoval;C. Silkworth;P. Turner;N. Varelas;B. Bilki;W. Clarida;K. Dilsiz;F. Duru;M. Haytmyradov;J. . . P.;H. Mermerkaya;A. Mestvirishvili;A. Moeller;J. Nachtman;H. Ogul;Y. Onel;F. Ozok;A. Penzo;R. Rahmat;S. Sen;P. Tan;E. Tiras;J. Wetzel;K. Yi;B. A. Barnett;B. Blumenfeld;S. Bolognesi;D. Fehling;A. V. Gritsan;P. Maksimovic;C. Martin;M. Swartz;P. Baringer;A. Bean;G. Benelli;C. Bruner;I. K. R.;M. Malek;M. Murray;D. Noonan;S. Sanders;J. Sekaric;R. Stringer;Q. Wang;J. S. Wood;I. Chakaberia;A. Ivanov;S. Khalil;M. Makouski;Y. Maravin;L. K. Saini;S. Shrestha;N. Skhirtladze;I. Svintradze;J. Gronberg;D. Lange;F. Rebassoo;D. Wright;A. Baden;A. Belloni;B. Calvert;S. C. Eno;J. A. Gomez;N. J. Hadley;R. G. Kellogg;T. Kolberg;Y. Lu;M. Marionneau;A. C. Mignerey;K. Pedro;A. Skuja;M. B. Tonjes;S. C. Tonwar;A. Apyan;R. Barbieri;G. Bauer;W. Busza;I. A. Cali;M. Chan;L. D. Matteo;G. G. Ceballos;M. Goncharov;D. Gulhan;M. Klute;Y. S. Lai;Y. . . J.;A. Levin;P. D. Luckey;T. Ma;C. Paus;D. Ralph;C. Roland;G. Roland;G. S. F.;F. Stoeckli;K. Sumorok;D. Velicanu;J. Veverka;B. Wyslouch;M. Yang;M. Zanetti;V. Zhukova;B. Dahmes;A. Gude;S. C. Kao;K. Klapoetke;Y. Kubota;J. Mans;N. Pastika;R. Rusack;A. Singovsky;N. Tambe;J. Turkewitz;J. G. Acosta;S. Oliveros;E. Avdeeva;K. Bloom;S. Bose;D. R. Claes;A. Dominguez;R. G. Suarez;J. Keller;D. Knowlton;I. Kravchenko;J. Lazo Flores;S. Malik;F. Meier;F. Ratnikov;G. R. Snow;M. Zvada;J. Dolen;A. Godshalk;I. Iashvili;A. Kharchilava;A. Kumar;S. Rappoccio;G. Alverson;E. Barberis;D. Baumgartel;M. Chasco;J. Haley;A. Massironi;D. M. Morse;D. Nash;T. Orimoto;D. Trocino;R. . . J.;D. Wood;J. Zhang;K. A. Hahn;A. Kubik;N. Mucia;N. Odell;B. Pollack;A. Pozdnyakov;M. Schmitt;S. Stoynev;K. Sung;M. Velasco;S. Won;A. Brinkerhoff;K. M. Chan;A. Drozdetskiy;M. Hildreth;C. Jessop;D. J. Karmgard;N. Kellams;K. Lannon;W. Luo;S. Lynch;N. Marinelli;T. Pearson;M. Planer;R. Ruchti;N. Valls;M. Wayne;M. Wolf;A. Woodard;L. Antonelli;J. Brinson;B. Bylsma;L. S. Durkin;S. Flowers;A. Hart;C. Hill;R. Hughes;K. Kotov;T. Y. Ling;D. Puigh;M. Rodenburg;G. Smith;B. L. Winer;H. Wolfe;H. W. Wulsin;O. Driga;P. Elmer;J. Hardenbrook;P. Hebda;A. Hunt;S. A. Koay;P. Lujan;D. Marlow;T. Medvedeva;M. Mooney;J. Olsen;P. Piroue;X. Quan;H. Saka;D. Stickland;C. Tully;J. S. Werner;A. Zuranski;E. Brownson;H. Mendez;J. E. Ramirez;V. E. Barnes;D. Benedetti;D. Bortoletto;M. D. Mattia;L. Gutay;Z. Hu;M. K. Jha;M. Jones;K. Jung;M. Kress;N. Leonardo;D. L. Pegna;V. Maroussov;D. H. Miller;N. Neumeister;B. C. Radburn Smith;X. Shi;I. Shipsey;D. Silvers;A. Svyatkovskiy;F. Wang;W. Xie;L. Xu;H. D. Yoo;J. Zablocki;Y. Zheng;N. Parashar;J. Stupak;A. Adair;B. Akgun;K. M. Ecklund;F. J. M.;W. Li;B. Michlin;B. P. Padley;R. Redjimi;J. Roberts;J. Zabel;B. Betchart;A. Bodek;R. Covarelli;P. d. Barbaro;R. Demina;Y. Eshaq;T. Ferbel;A. Garcia Bellido;P. Goldenzweig;J. Han;A. Harel;A. Khukhunaishvili;S. Korjenevski;G. Petrillo;D. Vishnevskiy;R. Ciesielski;L. Demortier;K. Goulianos;G. Lungu;C. Mesropian;S. Arora;A. Barker;J. P. Chou;C. Contreras Campana;E. Contreras Campana;D. Duggan;D. Ferencek;Y. Gershtein;R. Gray;E. Halkiadakis;D. Hidas;S. Kaplan;A. Lath;S. Panwalkar;M. Park;R. Patel;S. Salur;S. Schnetzer;S. Somalwar;R. Stone;S. Thomas;P. Thomassen;M. Walker;K. Rose;S. Spanier;A. York;O. Bouhali;A. C. Hernandez;R. Eusebi;W. Flanagan;J. Gilmore;T. Kamon;V. Khotilovich;V. Krutelyov;R. Montalvo;I. Osipenkov;Y. Pakhotin;A. Perloff;J. Roe;A. Rose;A. Safonov;I. Suarez;A. Tatarinov;N. Akchurin;C. Cowden;J. Damgov;C. Dragoiu;P. R. Dudero;J. Faulkner;K. Kovitanggoon;S. Kunori;S. W. Lee;T. Libeiro;I. Volobouev;E. Appelt;A. G. Delannoy;S. Greene;A. Gurrola;W. Johns;C. Maguire;Y. Mao;A. Melo;M. Sharma;P. Sheldon;B. Snook;S. Tuo;J. Velkovska;M. W. Arenton;S. Boutle;B. Cox;B. Francis;J. Goodell;R. Hirosky;A. Ledovskoy;H. Li;C. Lin;C. Neu;J. Wood;C. Clarke;R. Harr;P. E. Karchin;C. K. Kankanamge;P. Lamichhane;J. Sturdy;D. A. Belknap;D. Carlsmith;M. Cepeda;S. Dasu;L. Dodd;S. Duric;E. Friis;R. Hall Wilton;M. Herndon;A. Herve;P. Klabbers;A. Lanaro;C. Lazaridis;A. Levine;R. Loveless;A. Mohapatra;I. Ojalvo;T. Perry;G. A. Pierro;G. Polese;I. Ross;T. Sarangi;A. Savin;W. H. Smith;D. Taylor;P. Verwilligen;C. Vuosalo;N. Woods
2015
Abstract
A measurement of the W boson helicity is presented, where the W boson originates from the decay of a top quark produced in pp collisions. The event selection, optimized for reconstructing a single top quark in the final state, requires exactly one isolated lepton (muon or electron) and exactly two jets, one of which is likely to originate from the hadronization of a bottom quark. The analysis is performed using data recorded at a center-of-mass energy of 8 TeV with the CMS detector at the CERN LHC in 2012. The data sample corresponds to an integrated luminosity of 19.7 fb(-1). The measured helicity fractions are F-L = 0.298 +/- 0.028 (stat) +/- 0.032(syst), F-0 = 0.720 +/- 0.039 (stat) +/- 0.037(syst), and F-R = -0.018 +/- 0.019 (stat) +/- 0.011(syst). These results are used to set limits on the real part of the tWb anomalous couplings, g(L) and g(R).