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A search for new physics in dijet mass and angular distributions in pp collisions at TeV measured with the ATLAS detector
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Shupe10, P Sicho151, A Sidoti158,159, A Siebel213, F Siegert65, J Siegrist19, Dj Sijacki16, O Silbert210, J Silva149,218, Y Silver189, D Silverstein176, S B Silverstein181, V Simak153, O Simard169, Lj Simic16, S Simion138, B Simmons98, M Simonyan51, P Sinervo194, N B Sinev137, V Sipica174, G Siragusa102, A N Sisakyan85, S Yu Sivoklokov119, J Sjölin181,182, T B Sjursen18, L A Skinnari19, K Skovpen130, P Skubic134, N Skvorodnev31, M Slater22, T Slavicek153, K Sliwa198, T J Sloan91, J Sloper41, V Smakhtin210, S Yu Smirnov118, L N Smirnova119, O Smirnova100, B C Smith75, D Smith176, K M Smith71, M Smizanska91, K Smolek153, A A Snesarev116, S W Snow103, J Snow134, J Snuverink128, S Snyder34, M Soares149, R Sobie208,225, J Sodomka153, A Soffer189, C A Solans206, M Solar153, J Solc153, E Soldatov118, U Soldevila206, E Solfaroli Camillocci158,159, A A Solodkov154, O V Solovyanov154, J Sondericker34, N Soni2, V Sopko153, B Sopko153, M Sorbi110,111, M Sosebee11, A Soukharev130, S Spagnolo92,93, F Spanò50, R Spighi27, G Spigo41, F Spila158,159, E Spiriti162, R Spiwoks41, M Spousta152, T Spreitzer194, B Spurlock11, R D St Denis71, T Stahl174, J Stahlman144, R Stamen76, E Stanecka41, R W Stanek9, C Stanescu162, S Stapnes140, E A Starchenko154, J Stark73, P Staroba151, P Starovoitov113, A Staude120, P Stavina177, G Stavropoulos19, G Steele71, P Steinbach60, P Steinberg34, I Stekl153, B Stelzer175, H J Stelzer58, O Stelzer-Chilton195, H Stenzel70, K Stevenson96, G A Stewart71, J A Stillings29, T Stockmanns29, M C Stockton41, K Stoerig65, G Stoicea35, S Stonjek121, P Strachota152, A R Stradling11, A Straessner60, J Strandberg108, S Strandberg181,182, A Strandlie140, M Strang132, E Strauss176, M Strauss134, P Strizenec178, R Ströhmer212, D M Strom137, J A Strong97,245, R Stroynowski56, J Strube155, B Stugu18, I Stumer34,245, J Stupak184, P Sturm213, D A Soh187,231, D Su176, HS Subramania2, Y Sugaya139, T Sugimoto123, C Suhr129, K Suita87, M Suk152, V V Sulin116, S Sultansoy6, T Sumida41, X Sun73, J E Sundermann65, K Suruliz201,202, S Sushkov15, G Susinno52,53, M R Sutton172, Y Suzuki86, Yu M Sviridov154, S Swedish207, I Sykora177, T Sykora152, B Szeless41, J Sánchez206, D Ta128, K Tackmann41, A Taffard200, R Tafirout195, A Taga140, N Taiblum189, Y Takahashi123, H Takai34, R Takashima89, H Takeda87, T Takeshita173, M Talby104, A Talyshev130, M C Tamsett34, J Tanaka191, R Tanaka138, S Tanaka157, S Tanaka86, Y Tanaka122, K Tani87, N Tannoury104, G P Tappern41, S Tapprogge102, D Tardif194, S Tarem188, F Tarrade34, G F Tartarelli110, P Tas152, M Tasevsky151, E Tassi52,53, M Tatarkhanov19, C Taylor98, F E Taylor114, G N Taylor107, W Taylor196, M Teixeira Dias Castanheira96, P Teixeira-Dias97, K K Temming65, H Ten Kate41, P K Teng187, S Terada86, K Terashi191, J Terron101, M Terwort58,229, M Testa64, R J Teuscher194,225, C M Tevlin103, J Thadome213, J Therhaag29, T Theveneaux-Pelzer99, M Thioye214, S Thoma65, J P Thomas22, E N Thompson105, P D Thompson22, P D Thompson194, A S Thompson71, E Thomson144, M Thomson39, R P Thun108, T Tic151, V O Tikhomirov116, Y A Tikhonov130, C J W P Timmermans127, P Tipton214, F J Tique Aires Viegas41, S Tisserant104, J Tobias65, B Toczek54, T Todorov8, S Todorova-Nova198, B Toggerson200, J Tojo86, S Tokár177, K Tokunaga87, K Tokushuku86, K Tollefson109, M Tomoto123, L Tompkins19, K Toms126, A Tonazzo162,163, G Tong45, A Tonoyan18, C Topfel21, N D Topilin85, I Torchiani41, E Torrence137, E Torró Pastor206, J Toth104,239, F Touchard104, D R Tovey172, D Traynor96, T Trefzger212, J Treis29, L Tremblet41, A Tricoli41, I M Trigger195, S Trincaz-Duvoid99, T N Trinh99, M F Tripiana90, N Triplett84, W Trischuk194, A Trivedi34,238, B Trocmé73, C Troncon110, M Trottier-McDonald175, A Trzupek55, C Tsarouchas41, J C-L Tseng141, M Tsiakiris128, P V Tsiareshka112, D Tsionou8, G Tsipolitis13, V Tsiskaridze65, E G Tskhadadze69, I I Tsukerman117, V Tsulaia148, J-W Tsung29, S Tsuno86, D Tsybychev184, A Tua172, J M Tuggle42, M Turala55, D Turecek153, I Turk Cakir7, E Turlay128, R Turra110,111, P M Tuts50, A Tykhonov95, M Tylmad181,182, M Tyndel155, D Typaldos22, H Tyrvainen41, G Tzanakos12, K Uchida29, I Ueda191, R Ueno40, M Ugland18, M Uhlenbrock29, M Uhrmacher72, F Ukegawa197, G Unal41, D G Underwood9, A Undrus34, G Unel200, Y Unno86, D Urbaniec50, E Urkovsky189, P Urquijo66, P Urrejola43, G Usai11, M Uslenghi142,143, L Vacavant104, V Vacek153, B Vachon106, S Vahsen19, C Valderanis121, J Valenta151, P Valente158, S Valentinetti27,28, S Valkar152, E Valladolid Gallego206, S Vallecorsa188, J A Valls Ferrer206, H van der Graaf128, E van der Kraaij128, R Van Der Leeuw128, E van der Poel128, D van der Ster41, B Van Eijk128, N van Eldik105, P van Gemmeren9, Z van Kesteren128, I van Vulpen128, W Vandelli41, G Vandoni41, A Vaniachine9, P Vankov58, F Vannucci99, F Varela Rodriguez41, R Vari158, E W Varnes10, D Varouchas19, A Vartapetian11, K E Varvell186, V I Vassilakopoulos74, F Vazeille49, G Vegni110,111, J J Veillet138, C Vellidis12, F Veloso149, R Veness41, S Veneziano158, A Ventura92,93, D Ventura171, M Venturi65, N Venturi21, V Vercesi142, M Verducci171, W Verkerke128, J C Vermeulen128, A Vest60, M C Vetterli175,220, I Vichou204, T Vickey180,241, G H A Viehhauser141, S Viel207, M Villa27,28, M Villaplana Perez206, E Vilucchi64, M G Vincter40, E Vinek41, V B Vinogradov85, M Virchaux169,245, S Viret49, J Virzi19, A Vitale27,28, O Vitells210, M Viti58, I Vivarelli65, F Vives Vaque15, S Vlachos13, M Vlasak153, N Vlasov29, A Vogel29, P Vokac153, G Volpi64, M Volpi15, G Volpini110, H von der Schmitt121, J von Loeben121, H von Radziewski65, E von Toerne29, V Vorobel152, A P Vorobiev154, V Vorwerk15, M Vos206, R Voss41, T T Voss213, J H Vossebeld94, A S Vovenko154, N Vranjes16, M Vranjes Milosavljevic16, V Vrba151, M Vreeswijk128, T Vu Anh102, R Vuillermet41, I Vukotic138, W Wagner213, P Wagner144, H Wahlen213, J Wakabayashi123, J Walbersloh59, S Walch108, J Walder91, R Walker120, W Walkowiak174, R Wall214, P Waller94, C Wang61, H Wang211, J Wang187, J Wang48, J C Wang171, R Wang126, S M Wang187, A Warburton106, C P Ward39, M Warsinsky65, P M Watkins22, A T Watson22, M F Watson22, G Watts171, S Watts103, A T Waugh186, B M Waugh98, J Weber59, M Weber155, M S Weber21, P Weber72, A R Weidberg141, P Weigell121, J Weingarten72, C Weiser65, H Wellenstein31, P S Wells41, M Wen64, T Wenaus34, S Wendler148, Z Weng187,231, T Wengler41, S Wenig41, N Wermes29, M Werner65, P Werner41, M Werth200, M Wessels76, K Whalen40, S J Wheeler-Ellis200, S P Whitaker30, A White11, M J White107, S White34, S R Whitehead141, D Whiteson200, D Whittington81, F Wicek138, D Wicke213, F J Wickens155, W Wiedenmann211, M Wielers155, P Wienemann29, C Wiglesworth94, L A M Wiik65, P A Wijeratne98, A Wildauer206, M A Wildt58,229, I Wilhelm152, H G Wilkens41, J Z Will120, E Williams50, H H Williams144, W Willis50, S Willocq105, J A Wilson22, M G Wilson176, A Wilson108, I Wingerter-Seez8, S 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Published 24 May 2011 •
Published under licence by IOP Publishing Ltd
New Journal of Physics,
Volume 13,
May 2011
Citation G Aad et al 2011 New J. Phys.13 053044DOI 10.1088/1367-2630/13/5/053044
2 Department of Physics, University of Alberta, Edmonton AB, Canada
3 Department of Physics, Ankara University, Ankara, Turkey
4 Department of Physics, Dumlupinar University, Kutahya, Turkey
5 Department of Physics, Gazi University, Ankara, Turkey
6 Division of Physics, TOBB University of Economics and Technology, Ankara, Turkey
7 Turkish Atomic Energy Authority, Ankara, Turkey
8 LAPP, CNRS/IN2P3 and Université de Savoie, Annecy-le-Vieux, France
9 High Energy Physics Division, Argonne National Laboratory, Argonne IL, USA
10 Department of Physics, University of Arizona, Tucson AZ, USA
11 Department of Physics, The University of Texas at Arlington, Arlington TX, USA
12 Physics Department, University of Athens, Athens, Greece
13 Physics Department, National Technical University of Athens, Zografou, Greece
14 Institute of Physics, Azerbaijan Academy of Sciences, Baku, Azerbaijan
15 Institut de Física d'Altes Energies and Universitat Autònoma de Barcelona and ICREA, Barcelona, Spain
16 Institute of Physics, University of Belgrade, Belgrade, Serbia
17 Vinca Institute of Nuclear Sciences, Belgrade, Serbia
18 Department for Physics and Technology, University of Bergen, Bergen, Norway
19 Physics Division, Lawrence Berkeley National Laboratory and University of California, Berkeley CA, USA
20 Department of Physics, Humboldt University, Berlin, Germany
21 Albert Einstein Center for Fundamental Physics and Laboratory for High Energy Physics, University of Bern, Bern, Switzerland
22 School of Physics and Astronomy, University of Birmingham, Birmingham, United Kingdom
23 Department of Physics, Bogazici University, Istanbul, Turkey
24 Division of Physics, Dogus University, Istanbul, Turkey
25 Department of Physics Engineering, Gaziantep University, Gaziantep, Turkey
26 Department of Physics, Istanbul Technical University, Istanbul, Turkey
27 INFN Sezione di Bologna, Bologna, Italy
28 Dipartimento di Fisica, Università di Bologna, Bologna, Italy
29 Physikalisches Institut, University of Bonn, Bonn, Germany
30 Department of Physics, Boston University, Boston MA, USA
31 Department of Physics, Brandeis University, Waltham MA, USA
32 Universidade Federal do Rio De Janeiro COPPE/EE/IF, Rio de Janeiro, Brazil
33 Instituto de Fisica, Universidade de Sao Paulo, Sao Paulo, Brazil
34 Physics Department, Brookhaven National Laboratory, Upton NY, USA
35 National Institute of Physics and Nuclear Engineering, Bucharest, Romania
36 University Politehnica Bucharest, Bucharest, Romania
37 West University in Timisoara, Timisoara, Romania
38 Departamento de Física, Universidad de Buenos Aires, Buenos Aires, Argentina
39 Cavendish Laboratory, University of Cambridge, Cambridge, United Kingdom
40 Department of Physics, Carleton University, Ottawa ON, Canada
41 CERN, Geneva, Switzerland
42 Enrico Fermi Institute, University of Chicago, Chicago IL, USA
43 Departamento de Fisica, Pontificia Universidad Católica de Chile, Santiago, Chile
44 Departamento de Física, Universidad Técnica Federico Santa María, Valparaíso, Chile
45 Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China
46 Department of Modern Physics, University of Science and Technology of China, Anhui, China
47 Department of Physics, Nanjing University, Jiangsu, China
48 High Energy Physics Group, Shandong University, Shandong, China
49 Laboratoire de Physique Corpusculaire, Clermont Université and Université Blaise Pascal and CNRS/IN2P3, Aubiere Cedex, France
50 Nevis Laboratory, Columbia University, Irvington NY, USA
51 Niels Bohr Institute, University of Copenhagen, Kobenhavn, Denmark
52 INFN Gruppo Collegato di Cosenza, Italy
53 Dipartimento di Fisica, Università della Calabria, Arcavata di Rende, Italy
54 Faculty of Physics and Applied Computer Science, AGH-University of Science and Technology, Krakow, Poland
55 The Henryk Niewodniczanski Institute of Nuclear Physics, Polish Academy of Sciences, Krakow, Poland
56 Physics Department, Southern Methodist University, Dallas TX, USA
57 Physics Department, University of Texas at Dallas, Richardson TX, USA
58 DESY, Hamburg and Zeuthen, Germany
59 Institut für Experimentelle Physik IV, Technische Universität Dortmund, Dortmund, Germany
60 Institut für Kern- und Teilchenphysik, Technical University Dresden, Dresden, Germany
61 Department of Physics, Duke University, Durham NC, USA
62 SUPA—School of Physics and Astronomy, University of Edinburgh, Edinburgh, United Kingdom
63 Fachhochschule Wiener Neustadt, Wiener Neustadt, Austria
64 INFN Laboratori Nazionali di Frascati, Frascati, Italy
65 Fakultät für Mathematik und Physik, Albert-Ludwigs-Universität, Freiburg i.Br., Germany
66 Section de Physique, Université de Genève, Geneva, Switzerland
67 INFN Sezione di Genova, Genova, Italy
68 Dipartimento di Fisica, Università di Genova, Genova, Italy
69 Institute of Physics and HEP Institute, Georgian Academy of Sciences and Tbilisi State University, Tbilisi, Georgia
70 II Physikalisches Institut, Justus-Liebig-Universität Giessen, Giessen, Germany
71 SUPA—School of Physics and Astronomy, University of Glasgow, Glasgow, United Kingdom
72 II Physikalisches Institut, Georg-August-Universität, Göttingen, Germany
73 Laboratoire de Physique Subatomique et de Cosmologie, Université Joseph Fourier and CNRS/IN2P3 and Institut National Polytechnique de Grenoble, Grenoble, France
74 Department of Physics, Hampton University, Hampton VA, USA
75 Laboratory for Particle Physics and Cosmology, Harvard University, Cambridge MA, USA
76 Kirchhoff-Institut für Physik, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany
137 Center for High Energy Physics, University of Oregon, Eugene OR, USA
138 LAL, Univ. Paris-Sud and CNRS/IN2P3, Orsay, France
139 Graduate School of Science, Osaka University, Osaka, Japan
140 Department of Physics, University of Oslo, Oslo, Norway
141 Department of Physics, Oxford University, Oxford, United Kingdom
142 INFN Sezione di Pavia, Pavia, Italy
143 Dipartimento di Fisica Nucleare e Teorica, Università di Pavia, Pavia, Italy
144 Department of Physics, University of Pennsylvania, Philadelphia PA, USA
145 Petersburg Nuclear Physics Institute, Gatchina, Russia
146 INFN Sezione di Pisa, Pisa, Italy
147 Dipartimento di Fisica E. Fermi, Università di Pisa, Pisa, Italy
148 Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh PA, USA
149 Laboratorio de Instrumentacao e Fisica Experimental de Particulas—LIP, Lisboa, Portugal
150 Departamento de Fisica Teorica y del Cosmos and CAFPE, Universidad de Granada, Granada, Spain
151 Institute of Physics, Academy of Sciences of the Czech Republic, Praha, Czech Republic
152 Faculty of Mathematics and Physics, Charles University in Prague, Praha, Czech Republic
153 Czech Technical University in Prague, Praha, Czech Republic
154 State Research Center Institute for High Energy Physics, Protvino, Russia
155 Particle Physics Department, Rutherford Appleton Laboratory, Didcot, United Kingdom
156 Physics Department, University of Regina, Regina SK, Canada
157 Ritsumeikan University, Kusatsu, Shiga, Japan
158 INFN Sezione di Roma I, Roma, Italy
159 Dipartimento di Fisica, Università La Sapienza, Roma, Italy
160 INFN Sezione di Roma Tor Vergata, Roma, Italy
161 Dipartimento di Fisica, Università di Roma Tor Vergata, Roma, Italy
162 INFN Sezione di Roma Tre, Roma, Italy
163 Dipartimento di Fisica, Università Roma Tre, Roma, Italy
164 Faculté des Sciences Ain Chock, Réseau Universitaire de Physique des Hautes Energies—Université Hassan II, Casablanca, Morocco
165 Centre National de l'Energie des Sciences Techniques Nucleaires, Rabat, Morocco
166 Université Cadi Ayyad, Faculté des sciences Semlalia Département de Physique, B.P. 2390 Marrakech 40000, Morocco
167 Faculté des Sciences, Université Mohamed Premier and LPTPM, Oujda, Morocco
168 Faculté des Sciences, Université Mohammed V, Rabat, Morocco
169 DSM/IRFU (Institut de Recherches sur les Lois Fondamentales de l'Univers), CEA Saclay (Commissariat a l'Energie Atomique), Gif-sur-Yvette, France
170 Santa Cruz Institute for Particle Physics, University of California Santa Cruz, Santa Cruz CA, USA
171 Department of Physics, University of Washington, Seattle WA, USA
172 Department of Physics and Astronomy, University of Sheffield, Sheffield, United Kingdom
173 Department of Physics, Shinshu University, Nagano, Japan
174 Fachbereich Physik, Universität Siegen, Siegen, Germany
175 Department of Physics, Simon Fraser University, Burnaby BC, Canada
176 SLAC National Accelerator Laboratory, Stanford CA, USA
177 Faculty of Mathematics, Physics & Informatics, Comenius University, Bratislava, Slovak Republic
178 Department of Subnuclear Physics, Institute of Experimental Physics of the Slovak Academy of Sciences, Kosice, Slovak Republic
179 Department of Physics, University of Johannesburg, Johannesburg, South Africa
180 School of Physics, University of the Witwatersrand, Johannesburg, South Africa
181 Department of Physics, Stockholm University, Stockholm, Sweden
182 The Oskar Klein Centre, Stockholm, Sweden
183 Physics Department, Royal Institute of Technology, Stockholm, Sweden
184 Department of Physics and Astronomy, Stony Brook University, Stony Brook NY, USA
185 Department of Physics and Astronomy, University of Sussex, Brighton, United Kingdom
186 School of Physics, University of Sydney, Sydney, Australia
187 Institute of Physics, Academia Sinica, Taipei, Taiwan
188 Department of Physics, Technion: Israel Inst. of Technology, Haifa, Israel
189 Raymond and Beverly Sackler School of Physics and Astronomy, Tel Aviv University, Tel Aviv, Israel
190 Department of Physics, Aristotle University of Thessaloniki, Thessaloniki, Greece
191 International Center for Elementary Particle Physics and Department of Physics, The University of Tokyo, Tokyo, Japan
192 Graduate School of Science and Technology, Tokyo Metropolitan University, Tokyo, Japan
193 Department of Physics, Tokyo Institute of Technology, Tokyo, Japan
194 Department of Physics, University of Toronto, Toronto ON, Canada
195 TRIUMF, Vancouver BC, Toronto ON, Canada
196 Department of Physics and Astronomy, York University, Toronto ON, Canada
197 Institute of Pure and Applied Sciences, University of Tsukuba, Ibaraki, Japan
198 Science and Technology Center, Tufts University, Medford MA, USA
199 Centro de Investigaciones, Universidad Antonio Narino, Bogota, Colombia
200 Department of Physics and Astronomy, University of California Irvine, Irvine CA, USA
201 INFN Gruppo Collegato di Udine, Udine, Italy
202 ICTP, Trieste, Udine, Italy
203 Dipartimento di Fisica, Università di Udine, Udine, Italy
204 Department of Physics, University of Illinois, Urbana IL, USA
205 Department of Physics and Astronomy, University of Uppsala, Uppsala, Sweden
206 Instituto de Física Corpuscular (IFIC) and Departamento de Física Atómica, Molecular y Nuclear and Departamento de Ingenierá Electrónica and Instituto de Microelectrónica de Barcelona (IMB-CNM), University of Valencia and CSIC, Valencia, Spain
207 Department of Physics, University of British Columbia, Vancouver BC, Canada
208 Department of Physics and Astronomy, University of Victoria, Victoria BC, Canada
209 Waseda University, Tokyo, Japan
210 Department of Particle Physics, The Weizmann Institute of Science, Rehovot, Israel
211 Department of Physics, University of Wisconsin, Madison WI, USA
212 Fakultät für Physik und Astronomie, Julius-Maximilians-Universität, Würzburg, Germany
213 Fachbereich C Physik, Bergische Universität Wuppertal, Wuppertal, Germany
214 Department of Physics, Yale University, New Haven CT, USA
215 Yerevan Physics Institute, Yerevan, Armenia
216 Domaine scientifique de la Doua, Centre de Calcul CNRS/IN2P3, Villeurbanne Cedex, France
217 Also at Laboratorio de Instrumentacao e Fisica Experimental de Particulas—LIP, Lisboa, Portugal
218 Also at Faculdade de Ciencias and CFNUL, Universidade de Lisboa, Lisboa, Portugal
219 Also at CPPM, Aix-Marseille Université and CNRS/IN2P3, Marseille, France
220 Also at TRIUMF, Vancouver BC, Canada
221 Also at Department of Physics, California State University, Fresno CA, USA
222 Also at Faculty of Physics and Applied Computer Science, AGH-University of Science and Technology, Krakow, Poland
223 Also at Department of Physics, University of Coimbra, Coimbra, Portugal
224 Also at Università di Napoli Parthenope, Napoli, Italy
225 Also at Institute of Particle Physics (IPP), Canada
226 Also at Louisiana Tech University, Ruston LA, USA
227 Also at Group of Particle Physics, University of Montreal, Montreal QC, Canada
228 Also at Institute of Physics, Azerbaijan Academy of Sciences, Baku, Azerbaijan
229 Also at Institut für Experimentalphysik, Universität Hamburg, Hamburg, Germany
230 Also at Manhattan College, New York NY, USA
231 Also at School of Physics and Engineering, Sun Yat-sen University, Guanzhou, China
232 Also at Academia Sinica Grid Computing, Institute of Physics, Academia Sinica, Taipei, Taiwan
233 Also at High Energy Physics Group, Shandong University, Shandong, China
234 Also at California Institute of Technology, Pasadena CA, USA
235 Also at Particle Physics Department, Rutherford Appleton Laboratory, Didcot, United Kingdom
236 Also at Section de Physique, Université de Genève, Geneva, Switzerland
237 Also at Departamento de Fisica, Universidade de Minho, Braga, Portugal
238 Also at Department of Physics and Astronomy, University of South Carolina, Columbia SC, USA
239 Also at KFKI Research Institute for Particle and Nuclear Physics, Budapest, Hungary
240 Also at Institute of Physics, Jagiellonian University, Krakow, Poland
241 Also at Department of Physics, Oxford University, Oxford, United Kingdom
242 Also at DSM/IRFU (Institut de Recherches sur les Lois Fondamentales de l'Univers), CEA Saclay (Commissariat a l'Energie Atomique), Gif-sur-Yvette, France
243 Also at Laboratoire de Physique Nucléaire et de Hautes Energies, UPMC and Université Paris-Diderot and CNRS/IN2P3, Paris, France
244 Also at Department of Physics, Nanjing University, Jiangsu, China
A search for new interactions and resonances produced in LHC proton–proton (pp) collisions at a centre-of-mass energy was performed with the ATLAS detector. Using a dataset with an integrated luminosity of 36 pb− 1, dijet mass and angular distributions were measured up to dijet masses of ∼3.5 TeV and were found to be in good agreement with Standard Model predictions. This analysis sets limits at 95% CL on various models for new physics: an excited quark is excluded for mass between 0.60 and 2.64 TeV, an axigluon hypothesis is excluded for axigluon masses between 0.60 and 2.10 TeV and quantum black holes are excluded in models with six extra space–time dimensions for quantum gravity scales between 0.75 and 3.67 TeV. Production cross section limits as a function of dijet mass are set using a simplified Gaussian signal model to facilitate comparisons with other hypotheses. Analysis of the dijet angular distribution using a novel technique simultaneously employing the dijet mass excludes quark contact interactions with a compositeness scale Λ below 9.5 TeV.
GENERAL SCIENTIFIC SUMMARY Introduction and background. In the first full year of collisions at the Large Hadron Collider (LHC) at the unprecedented centre-of-mass energy of 7 TeV, the ATLAS experiment has taken data that significantly advance the energy frontier and allow searches for new physics beyond the Standard Model. The analysis presented in this paper focuses on dijet final states. As a quark or gluon from one proton interacts with a quark or gluon from the other, two collimated clusters of particles called 'jets' are produced. These pairs of jets are called 'dijets'. If some new heavy particle is being created that decays to these dijets of particles, it will be seen as an increased rate of events with a given value in the dijet mass distribution. And if a new interaction appears, it is predicted to yield more events where the dijet system is produced at a large angle to the beam line—as in Rutherford scattering.
Main results. Various theories that extend the Standard Model predict new particles that would decay to two jets. We have searched for excited quarks, axigluons, microscopic short-lived black holes, and for yet-more fundamental particles that could constitute quarks. No evidence for new physics has been seen, which implies that any new physics must occur at higher mass scales than this early LHC running can test.
Wider implications. In 2010, its first year of operation, the LHC operated at 1/40th of its eventual design luminosity. During 2011–2012 the luminosity will be increased by a factor of up to 10, which will greatly extend the reach of these dijet studies, and lead to similar gains for many other ATLAS searches.
Figure. The observed dijet mass (D) distribution (filled points) fitted using the Standard Model background (B) expectation. For demonstration purposes, excited-quark signals with masses of 1000, 1700, and 2500 are overlaid. The bin-by-bin significance of the data-background difference is shown in the lower panel.