Measurement of the ratio of the inclusive 3-jet cross section to the inclusive 2-jet cross section in pp collisions at \sqrt{s} = 7\ \mathrm{TeV} and first determination of the strong coupling constant in the TeV range

S Chatrchyan,Vardan Khachatryan, A M Sirunyan,Armen Tumasyan, W Adam, T Bergauer,M Dragicevic, Janos Ero, C Fabjan,Markus Friedl, R Fruhwirth, V M Ghete, Natascha Hormann, J Hrubec, M Jeitler, W Kiesenhofer,Valentin Knunz,M Krammer,Ilse Kratschmer, D Liko, I Mikulec, Dinyar Rabady,Babak Rahbaran, C Rohringer, H Rohringer,Robert Schofbeck, J Strauss, A Taurok, Wolfgang Treberertreberspurg,Wolfgang Waltenberger, C E Wulz, Vladimir Mossolov, N Shumeiko,J Suarez Gonzalez,Sara Alderweireldt, M P Bansal,Sunil Bansal,Tom Cornelis,E A De Wolf, X Janssen, A Knutsson,Sten Luyckx,L Mucibello, S Ochesanu, Benoit Roland, R Rougny,H Van Haevermaet,P Van Mechelen,N Van Remortel,A Van Spilbeeck, F Blekman, S Blyweert, J D Hondt, A Kalogeropoulos,J Keaveney,Michael Maes, Annik Olbrechts, S Tavernier,W Van Doninck,P Van Mulders,G P Van Onsem, I Villella,Barbara Clerbaux,G De Lentdecker,Laurent Favart,Arnaud Gay,Tomas Hreus,A Leonard,Pierre Marage,A Mohammadi, T Reis,Laurent Thomas, C Vander Velde,Pascal Vanlaer,Jun Wang,Volker Adler, Kelly Beernaert,Leonardo Benucci,Anna Cimmino, S Costantini,Sven Dildick,G Garcia,Barbara P Klein,J Lellouch, Andrey Marinov,Joseph Mccartin,A A Ocampo Rios, D Ryckbosch, M Sigamani,Nadja Strobbe,Filip Thyssen, M Tytgat,Scott T R Walsh,Efe Yazgan, N Zaganidis, Suzan Basegmez,Camille Beluffi, G Bruno,Rinaldo Castello,Adrien Caudron, Ludivine Ceard, Christophe Delaere,T Du Pree, Denis Favart, Laurent Forthomme,Andrea Giammanco, Jonathan Hollar,Vincent Lemaitre,J Liao,Otilia Militaru, Claude Nuttens, Davide Pagano,Arnaud Pin, Krzysztof Piotrzkowski,A Popov,Michele Selvaggi,J M Vizan Garcia,Nikita Beliy,Thierry Caebergs, E Daubie, Gregory Habib Hammad, G A Alves,M Correa Martins Junior,T Martins, M E Pol, M H G Souza,W L Alda Junior,Werther Brunow De Carvalho, Jose Chinellato, Analu Custodio, E M Da Costa,D De Jesus Damiao,C De Oliveira Martins,S Fonseca De Souza, Helena Malbouisson,Moh H Malek,D Matos Figueiredo, L Mundim, H Nogima,W L Prado Da Silva, A Santoro,L Soares Jorge, A Sznajder,E J Tonelli Manganote,A Vilela Pereira,T S Anjos, Cesar Augusto Bernardes,F A Dias,T R Fernandez Perez Tomei,E M Gregores, Caio Lagana, Franciole Da Cunha Marinho, P G Mercadante, S F Novaes,Sandra S Padula, Vladimir Genchev, P Iaydjiev,Stefan Piperov,M Rodozov, Stefka Stoykova, G Sultanov, Vanio Tcholakov,R Trayanov, Mariana Vutova, Anton Dimitrov, Roumyana Hadjiiska, V Kozhuharov,Leander Litov,B Pavlov,Petko M Petkov,J G Bian,G M Chen, H S Chen, C H Jiang,Dong Liang,Sheng Liang,X Meng,J Tao,X Wang,Zhikui Wang,H Xiao, Mingkai Xu,Chayanit Asawatangtrakuldee, Y Ban, Y Guo,Qizhai Li,Wenjun Li,Shirong Liu, Y Mao, S J Qian, Dacheng Wang, L Zhang,Wei Zou, C Avila,C A Carrillo Montoya,B Gomez Moreno, J C Sanabria, N Godinovic, D Lelas, Roko Plestina, Dunja Polic, I Puljak,Zeljko Antunovic,M Kovac, V Brigljevic,Senka Duric, K Kadija, Jelena Luetic, D Mekterovic,Srecko Morovic,L Tikvica,Alexandros Attikis, Georgios Mavromanolakis, J Mousa, Charalambos Nicolaou, Fotios Ptochos, P A Razis, M Finger, Y Assran,A Ellithi Kamel, M A Mahmoud, Ayman Mahrous, Amr Radi,Mario Kadastik, Mait Muntel, Marion Murumaa,Martti Raidal,Liis Rebane, Andres Tiko, P Eerola,Giacomo Fedi, M Voutilainen, J Harkonen, V Karimaki,Ritva Kinnunen,Matti J Kortelainen,T Lampen, K Lassilaperini, S Lehti, Tomas Linden,Panjariina Luukka, T Maenpaa, Timo Peltola, E Tuominen, J Tuominiemi,Esa Tuovinen, Lauri Wendland, A Korpela, T Tuuva, M Besancon,S Choudhury, 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, L Millischer, A K Nayak, J Rander, A Rosowsky, M Titov, S Baffioni, F Beaudette,Lamia Benhabib,Lorenzo Bianchini, M Bluj, P Busson, C Charlot, Nadir Daci, T Dahms, Mykhailo Dalchenko, L Dobrzynski,Alice Florent,R Granier De Cassagnac, M Haguenauer, P Mine, C Mironov, Ivo Nicolas Naranjo, M Nguyen, C Ochando, P Paganini, D Sabes,Roberto Salerno, Y Sirois, C Veelken, A Zabi, J L Agram, J Andrea,D Bloch, D Bodin, J M Brom, E C Chabert, Caroline Collard, E Conte, F Drouhin, J C Fontaine, D Gele, U Goerlach, Christophe Goetzmann, P Juillot,A C Le Bihan,P Van Hove, S Beauceron, N Beaupere, G Boudoul,Sebastien Brochet, J Chasserat, R Chierici, D Contardo, P Depasse,H El Mamouni, J Fay, S Gascon, M Gouzevitch, B Ille, T Kurca,M Lethuillier, L Mirabito,S Perries, Louis Sgandurra,V Sordini, Y Tschudi,M Vander Donckt,P Verdier,Sebastien Viret,Zviad Tsamalaidze, C Autermann,Sarah Beranek,B Calpas,Matthias Edelhoff, L Feld,Natalie Heracleous, Otto Hindrichs,K K Klein, Jennifer Merz, Andrey Ostapchuk,Adrian Perieanu, F Raupach,J Sammet, S Schael, D Sprenger, B Wittmer, Valery Zhukov,Metin Ata,Julien Caudron,Erik Dietzlaursonn, Deborah Duchardt, Mark V Erdmann,Richard A Fischer,Andreas Guth, T Hebbeker, Carsten Heidemann, K Hoepfner,Dennis Klingebiel,Peter Kreuzer, M Merschmeyer,Mark Olschewski, Klaas Padeken,Paul Papacz, H Pieta, H Reithler,Stefan Antonius Schmitz, L Sonnenschein,Jan Steggemann, D Teyssier,Sebastian Thuer, M Weber, Vladimir Cherepanov, Yusuf Erdogan, G Flugge,Heiko Geenen,M Geisler,W Haj Ahmad, Felix Hoehle,Bastian Kargoll, T Kress, Yvonne Kuessel, Joschka Lingemann, A Nowack, I M Nugent, L Perchalla, O Pooth,Achim Stahl,M Aldaya Martin, Ivan Asin,Nazar Bartosik, J Behr, W Behrenhoff, U Behrens, M Bergholz, Agni Bethani, K Borras,Armin Burgmeier, Altan Cakir, Luigi Calligaris, Alasdair J Campbell, Francesco Costanza,C Diez Pardos, T Dorland, G Eckerlin, D Eckstein, G Flucke, A Geiser, I Glushkov, Paolo Gunnellini,S Habib,Johannes Hauk,G Hellwig, H Jung, M Kasemann, P Katsas, C Kleinwort, H Kluge,M Kramer, D Krucker,Ekaterina Kuznetsova,W Lange, J A Leonard,K Lipka, W Lohmann,B Lutz, R Mankel,I Marfin, I A Melzerpellmann, A Meyer, J Mnich, Andreas Mussgiller,Sebastian Naumannemme, Olga Novgorodova, F Nowak, J Olzem,Hanno Perrey, A Petrukhin, D Pitzl,Alexei Raspereza,P M Ribeiro Cipriano, Christopher C Riedl,E Ron, Jakob Salfeldnebgen,R Schmidt, Thomas Schoernersadenius,N Sen,Matthias Stein, R M Walsh,Christoph Wissing, V Blobel, H Enderle, Joachim Erfle, U Gebbert,Martin Gorner, M Gosselink,Julia A Haller,K Heine, Rebekka Sophie Hoing, G Kaussen,Henning Kirschenmann, R Klanner, J S Lange, T Peiffer,Niklas Pietsch,Denis Rathjens,C Sander, Hannes Schettler, P Schleper,Eike Schlieckau,Ann Marie Schmidt,M Schroder, T Schum,Markus Seidel, J Sibille,Valentina Sola, H Stadie, Georg Steinbruck,Jan Thomsen,Lukas Vanelderen,C Barth, Colin Baus, J P Berger, Christian Boser, T Chwalek,W De Boer, Alexis Descroix, A Dierlamm, M Feindt,Moritz Guthoff, C Hackstein,F Hartmann,Thomas Hauth,M Heinrich,H Held, K H Hoffmann,U Husemann, I Katkov,Jyothsna Rani Komaragiri, Andreas Kornmayer,P Lobelle Pardo, D Martschei,Susette C Mueller,Th Muller, M Niegel, Andreas Nurnberg, O Oberst, Jochen Ott, G Quast, K Rabbertz, F Ratnikov, N Ratnikova, Steffen Rocker, F P Schilling,G Schott, H J Simonis, F M Stober,Daniel Troendle,R 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Abdulsalam, D Dutta, S Kailas,V Kumar,A K Mohanty, L M Pant, P N Shukla,Anita Topkar, T Aziz,Rajdeep Mohan Chatterjee,Samrat Ganguly,Monoranjan Guchait, A Gurtu, M Maity, G Majumder, K Mazumdar, G B Mohanty,Bibhuti Parida, K Sudhakar, Nadeesha Wickramage, S R Dugad, H Arfaei,Hamed Bakhshiansohi,Seyed Mohsen Etesami,Ali Fahim, H Hesari,A Jafari, M Khakzad,M Mohammadi Najafabadi,S Paktinat Mehdiabadi,Batool Safarzadeh,Maryam Zeinali, M W Grunewald, M Abbrescia, L Barbone,Cesare Calabria,Simranjit Singh 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, G Selvaggi, L Silvestris,G Singh,Rosamaria Venditti,Piet Verwilligen, G Zito, G Abbiendi, A C Benvenuti, D Bonacorsi,Sylvie Braibantgiacomelli, L Brigliadori,Renato Campanini, P Capiluppi, A Castro, F R Cavallo, M Cuffiani, G M Dallavalle, F Fabbri, A Fanfani,Daniele Fasanella,P Giacomelli, C Grandi,Luigi Guiducci, S Marcellini, G 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Grothe, R Hallwilton, M Herndon,A Herve, Pamela Klabbers, J Klukas, A Lanaro, C Lazaridis, Richard Loveless, A Mohapatra, M U Mozer,I Ojalvo, Giuseppe Antonio Pierro, I Ross, A Savin, W H Smith,J Swanson

European Physical Journal C(2013)

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摘要
A measurement is presented of the ratio of the inclusive 3-jet cross section to the inclusive 2-jet cross section as a function of the average transverse momentum, \(\langle p_{\mathrm{T1,2}}\rangle\), of the two leading jets in the event. The data sample was collected during 2011 at a proton–proton centre-of-mass energy of 7 TeV with the CMS detector at the LHC, corresponding to an integrated luminosity of 5.0 fb−1. The strong coupling constant at the scale of the Z boson mass is determined to be α S (M Z)=0.1148±0.0014 (exp.)±0.0018 (PDF)±0.0050(theory), by comparing the ratio in the range \(0.42 < \langle p_{\mathrm{T1,2}}\rangle< 1.39~\mathrm{TeV}\) to the predictions of perturbative QCD at next-to-leading order. This is the first determination of α S (M Z) from measurements at momentum scales beyond 0.6 TeV. The predicted ratio depends only indirectly on the evolution of the parton distribution functions of the proton such that this measurement also serves as a test of the evolution of the strong coupling constant. No deviation from the expected behaviour is observed.
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