Measurement of the Polarization ofWBosons with Large Transverse Momenta inW+jetsEvents at the LHC

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Zaganidis,N Eggert,A Sill,A Beretvas,A Mohammadi,P G Verdini,S Salur,A Godshalk,J Efron,K Rose,V Patras,P R Dudero,M Tadel,A T Laasanen,Y Mikami,J Richman,D Fasanella,F J M Geurts,H Kalakhety,P Martinez Ruiz Del Arbol,G Majumder,L Foà,D Silvers,U Gasparini,P Juillot,F Palmonari,H S Chen,P Azzurri,A Mott,L Guiducci,F L Navarria,S Goy Lopez,M Marienfeld,A Khan,M Gallinaro,M Jindal,H Stadie,F Torres Da Silva De Araujo,K Gill,S Albergo,N Manthos,V Kumar,L Dudko,W Funk,S Sala,M Bontenackels,T Kelly,M Ignatenko,N Manna,S Rogerson,C Sander,P Raics,R Rougny,W Van Doninck,V Savrin,J L Faure,M Swartz,D Puigh,A Solano,O Hindrichs,E Di Marco,F J Ronga,A Heikkinen,D Bourilkov,L Masetti,M Pimiä,G Wrochna,M Chertok,G Walzel,U Langenegger,T Kamon,X Wang,G Barbagli,Y Kubota,P Avery,E Vlasov,B Betchart,G Landsberg,G Codispoti,V Timciuc,S Somalwar,J Mans,P Moisenz,R A Ofierzynski,M Vazquez Acosta,D Leslie,T Lindén,M Sasseville,J Zhang,L K Gibbons,D Carlsmith,D Majumder,F Nowak,A Maurisset,R Gonzalez 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P Fernández Ramos,M Azarkin,A Triossi,I Azhgirey,C De Oliveira Martins,M Simon,C Botta,L Lyons,M Grothe,E Meschi,M I Josa,R Redjimi,W Andrews,R Khatiwada,M Biasini,S Lee,L Gutay,J A Bakken,Z Hu,D Orbaker,H J Simonis,B Diamond,I Segoni,C Hill,T Rohe,P De Barbaro,A Santocchia,A Dominguez,N Mccoll,H D Yoo,M Rovere,B Hegner,K Theofilatos,G Abbiendi,A Pompili,C H Shepherd-Themistocleous,I Papadopoulos,Y Zheng,V Smirnov,R D Field,M Schmanau,J Seixas,C Ferro,L M Villasenor-Cendejas,A Khukhunaishvili,C Loizides,A Deisher,M Gataullin,W J Womersley,R Montalvo,J Hanlon,W Zou,E A Albayrak,P Baillon,R Gomez-Reino Garrido,M Giffels,S Bitioukov,G M Chen,S G Heo,T Aziz,P Jarry,K Maeshima,W Ferguson,P Zotto,M S Jeong,J.-M Brom,S Costa,C Rovelli,J Mousa,F Borcherding,A Elliott-Peisert,M Grimes,D Lanske,C Fernandez Bedoya,M Kossov,H Mermerkaya,T Dahms,J Yoo,C Jeong,E Yildirim,H Teng,P Busson,F Santanastasio,R D’Alessandro,D Contardo,P Paolucci,H Gerwig,A Ghezzi,C Maguire,C Brew,E Boos,F A Triantis,S V Rusakov,R Carroll,E Laird,E Appelt,F Chlebana,J Goldstein,J Puerta Pelayo,E Seo,M Merola,P Capiluppi,C Fantasia,A Hunt,F J Munoz Sanchez,A Sparrow,P Schieferdecker,D M Newbold,J Alexander,C Nicolaou,D Acosta,W Waltenberger,S Carrillo Moreno,J Haas,A Penzo,D Bodin,J Bernardini,A Poll,K Burkett,J.-P Merlo,V Gavrilov,O Bondu,A Perrotta,I Chakaberia,Л Дімітров ,J Andreä ,L Felď ,Α Μάρκου ,V Reković ,J A Gómez ,Alberto Orso Maria Iorio ,H Flächer ,M Besançon ,D G Cassel ,M Souza ,Anuj Chandra ,А Спиридонов ,E Alagöz ,L Dobrzyński ,S Czellár ,M Ćwiok ,J Königsberg ,D Ferenček ,M C Sawley ,G Mäggi ,H Méndez ,N Godinović ,V Lemaı̂tre ,S A Tupputi ,S Başeğmez ,G Kaußen ,G Önengüt ,A Özpineci ,M Pioppí ,F Özok ,M Calderón De La Barca Sánchez ,James Russ ,Raymond Patrick Kenny ,Phil Harris ,J Pálinkás ,C Y Lin ,Giuseppe Antonio Pierro ,C Hajdú ,B Wysłouch ,M Sobron Sañudo ,J Sánchez ,A Rýd ,A Çakır ,J Molnár ,D De Jesus Damião ,T Maënpaä ,J M Hernández ,Eric Wayne Vaandering ,A K Honma ,Karl-Heinz Hoffmann ,D Kotliński ,M Ataç ,J Królikowski ,D J Summers ,Pedro Ribeiro ,M Grünewald ,Kristan Allan Hahn ,N Béni ,A F Osório Oliveros ,P Garcı́a-Abia ,O Buchmüller ,C Tuvé ,L Cremaldi ,S Bilmiş ,Sh Jain ,E Eşkut ,D Jang ,A García-Bellido ,I Hoş ,H Castilla‐Valdez ,J S Keller ,W Białas ,G Gómez ,Thomas Schwarz ,S Đurić ,B K Heltsley ,G Gökbulut ,C Laganá ,Humberto Antonio Salazar Ibarguen ,N Beaupère ,P Adžić ,В Сулимов ,M J Costa ,A Rossi ,K Krajczár ,R Démina ,J Fernández Menéndez ,L Muñiz ,J Bellinger ,J Milošević ,T Cheng ,P Milenović ,Н Голубев ,G P Siroli ,V Brigljević ,S Argirò ,D Mekterović ,A S Sharma ,Ž Antunović ,K M Smith ,P Maksimović ,W E Cooper ,Min Xu ,D R Wardrope ,В Качанов ,M Nikolić ,K T Flood ,А Виноградов ,C Martínez Rivero ,G Martı́nez ,S Singh ,Sergey Petrushanko ,I González Caballero ,L Boldizsár ,M Zieliński ,B X Zhu ,B Ujvári ,Martin Weber ,T Kurča ,K Buńkowski ,E Clément ,C Oʼbrien ,J Wood ,Р Тенчини ,N Sönmez ,S Çerçi ,F Pauß ,A Adıgüzel ,A Kopecký ,S Perriès ,F P Schilling ,Hans Hoffmann ,A López ,A Rácz ,Mauro Emanuele Dinardo ,D Blöch ,B Millán Mejías ,S Eno ,M Bóna ,Z Yang ,Y J Lee ,S Özkorucuklu ,J Malclès ,B Akgün ,M Fernández ,F A Teischinger ,M S Rudolph ,S Schmitz ,R López-Fernández ,M Dželalija ,F Siklér ,B Işıldak ,D Ćutts ,Hannsjoerg Artur Weber ,Alberto Andres Ocampo Rios ,I Dumanoğlu ,F Nessi‐Tedaldi ,A Calderón ,В Жуков ,M Aguilar-Benı́tez ,M Déjardin ,J Y C Tam ,K Höepfner ,R Pleština ,K Öcalan ,Andreas Oehler ,V Veszprémi ,Benjamin Charles Radburn-Smith ,Arun Kumar ,T Schöerner-Sadenius ,Song Guo ,A Polatöz ,D Horváth ,M E Mattson ,Hans-Christian Kaestli ,Z Szillási ,O González López ,Lloyd Stanley Durkin ,Yu‐Wei Chang

doi:10.1103/physrevlett.107.021802

Abstract

A first measurement of the polarization of W bosons with large transverse momenta in pp collisions is presented. The measurement is based on 36 pb⁻¹ of data recorded at √s = 7 TeV by the CMS detector at the LHC. The left-handed, right-handed, and longitudinal polarization fractions (f(L), f(R), and f₀, respectively) of W bosons with transverse momenta larger than 50 GeV are determined by using decays to both electrons and muons. The muon final state yields the most precise measurement: (f(L) - f(R))⁻ = 0.240 ± 0.036(stat) ± 0.031(syst) and f₀⁻ = 0.183 ± 0.087(stat) ± 0.123(syst) for negatively charged W bosons and (f(L) - f(R))⁺ = 0.310 ± 0.036(stat) ± 0.017(syst) and f₀⁺ = 0.171 ± 0.085(stat) ± 0.099(syst) for positively charged W bosons. This establishes, for the first time, that W bosons produced in pp collisions with large transverse momenta are predominantly left-handed, as expected in the standard model.

Highlights

A first measurement of the polarization of W bosons with large presented
The measurement is based on 36 pbÀ1 of data recorded tartapnsffisffiv1⁄4ers7e momenta in pp collisions TeV by the Compact Muon Solenoid (CMS) detector is at the Large Hadron Collider (LHC)
The left-handed, right-handed, and longitudinal polarization fractions of W bosons with transverse momenta larger than 50 GeV are determined by using decays to both electrons and muons

Summary

Introduction

A first measurement of the polarization of W bosons with large presented. The measurement is based on 36 pbÀ1 of data recorded tartapnsffisffiv1⁄4ers7e momenta in pp collisions TeV by the CMS detector is at the LHC. The left-handed, right-handed, and longitudinal polarization fractions (fL, fR, and f0, respectively) of W bosons with transverse momenta larger than 50 GeV are determined by using decays to both electrons and muons.

Results

Conclusion