@article{10902/1851, year = {2011}, month = {4}, url = {http://hdl.handle.net/10902/1851}, abstract = {We report a study of the invariant mass distribution of jet pairs produced in association with a W boson using data collected with the CDF detector which correspond to an integrated luminosity of 4.3  fb-1. The observed distribution has an excess in the 120–160  GeV/c2 mass range which is not described by current theoretical predictions within the statistical and systematic uncertainties. In this Letter, we report studies of the properties of this excess.}, organization = {We thank the Fermilab theory group for helpful suggestions, particularly J. M. Campbell, E. J. Eichten, R. K. Ellis, C. T. Hill, and A. O. Martin. We are grateful to K. D. Lane and M. L. Mangano. We thank the Fermilab staff and the technical staffs of the participating institutions for their vital contributions. This work was supported by the U.S. Department of Energy and National Science Foundation; the Italian Istituto Nazionale di Fisica Nucleare; the Ministry of Education, Culture, Sports, Science and Technology of Japan; the Natural Sciences and Engineering Research Council of Canada; the National Science Council of the Republic of China; the Swiss National Science Foundation; the A. P. Sloan Foundation; the Bundesministerium für Bildung und Forschung, Germany; the Korean World Class University Program, the National Research Foundation of Korea; the Science and Technology Facilities Council and the Royal Society, United Kingdom; the Institut National de Physique Nucleaire et Physique des Particules/CNRS; the Russian Foundation for Basic Research; the Ministerio de Ciencia e Innovación, and Programa Consolider-Ingenio 2010, Spain; the Slovak R&D Agency; and the Academy of Finland.}, publisher = {American Physical Society}, publisher = {Physical Review Letters, 2011, 106(17), 171801}, title = {Invariant mass distribution of jet pairs produced in association with a W boson in pp̅ collisions at √s=1.96  TeV}, author = {Aaltonen, Timo Antero and Álvarez González, Bárbara and Casal Laraña, Bruno and Cuevas Maestro, Francisco Javier and Gómez Gramuglio, Gervasio and Palencia Cortezón, José Enrique and Rodrigo Anoro, Teresa and Ruiz Jimeno, Alberto and Scodellaro, Luca and Vila Álvarez, Iván and Vilar Cortabitarte, Rocío and Vizán García, Jesús Manuel}, }