https://doi.org/10.1140/epjc/s10052-018-5691-6
Regular Article - Experimental Physics
Study of dijet events with a large rapidity gap between the two leading jets in pp collisions at 
1
Yerevan Physics Institute, Yerevan, Armenia
2
Institut für Hochenergiephysik, Vienna, Austria
3
Institute for Nuclear Problems, Minsk, Belarus
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National Centre for Particle and High Energy Physics, Minsk, Belarus
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Universiteit Antwerpen, Antwerp, Belgium
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Vrije Universiteit Brussel, Brussels, Belgium
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Université Libre de Bruxelles, Brussels, Belgium
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Ghent University, Ghent, Belgium
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Université Catholique de Louvain, Louvain-la-Neuve, Belgium
10
Université de Mons, Mons, Belgium
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Centro Brasileiro de Pesquisas Fisicas, Rio de Janeiro, Brazil
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Universidade do Estado do Rio de Janeiro, Rio de Janeiro, Brazil
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Universidade Estadual Paulista, Universidade Federal do ABC, São Paulo, Brazil
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Institute for Nuclear Research and Nuclear Energy of Bulgaria Academy of Sciences, Sofia, Bulgaria
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University of Sofia, Sofia, Bulgaria
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Beihang University, Beijing, China
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Institute of High Energy Physics, Beijing, China
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State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing, China
19
Universidad de Los Andes, Bogotá, Colombia
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Faculty of Electrical Engineering, Mechanical Engineering and Naval Architecture, University of Split, Split, Croatia
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University of Split, Faculty of Science, Split, Croatia
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Institute Rudjer Boskovic, Zagreb, Croatia
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University of Cyprus, Nicosia, Cyprus
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Charles University, Prague, Czech Republic
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Universidad San Francisco de Quito, Quito, Ecuador
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Academy of Scientific Research and Technology of the Arab Republic of Egypt, Egyptian Network of High Energy Physics, Cairo, Egypt
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National Institute of Chemical Physics and Biophysics, Tallinn, Estonia
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Department of Physics, University of Helsinki, Helsinki, Finland
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Helsinki Institute of Physics, Helsinki, Finland
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Lappeenranta University of Technology, Lappeenranta, Finland
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IRFU, CEA, Université Paris-Saclay, Gif-sur-Yvette, France
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Laboratoire Leprince-Ringuet, Ecole polytechnique, CNRS/IN2P3, Université Paris-Saclay, Palaiseau, France
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Université de Strasbourg, CNRS IPHC UMR 7178, 67000, Strasbourg, France
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Centre de Calcul de l’Institut National de Physique Nucleaire et de Physique des Particules, CNRS/IN2P3, Villeurbanne, France
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Université de Lyon, Université Claude Bernard Lyon 1, CNRS-IN2P3, Institut de Physique Nucléaire de Lyon, Villeurbanne, France
36
Georgian Technical University, Tbilisi, Georgia
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Tbilisi State University, Tbilisi, Georgia
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RWTH Aachen University, I. Physikalisches Institut, Aachen, Germany
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RWTH Aachen University, III. Physikalisches Institut A, Aachen, Germany
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RWTH Aachen University, III. Physikalisches Institut B, Aachen, Germany
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Deutsches Elektronen-Synchrotron, Hamburg, Germany
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University of Hamburg, Hamburg, Germany
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Institut für Experimentelle Kernphysik, Karlsruhe, Germany
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Institute of Nuclear and Particle Physics (INPP), NCSR Demokritos, Aghia Paraskevi, Greece
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National and Kapodistrian University of Athens, Athens, Greece
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University of Ioánnina, Ioánnina, Greece
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MTA-ELTE Lendület CMS Particle and Nuclear Physics Group, Eötvös Loránd University, Budapest, Hungary
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Wigner Research Centre for Physics, Budapest, Hungary
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Institute of Nuclear Research ATOMKI, Debrecen, Hungary
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Institute of Physics, University of Debrecen, Debrecen, Hungary
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Indian Institute of Science (IISc), Bangalore, India
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National Institute of Science Education and Research, Bhubaneswar, India
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Panjab University, Chandigarh, India
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University of Delhi, Delhi, India
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Saha Institute of Nuclear Physics, HBNI, Kolkata, India
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Indian Institute of Technology Madras, Madras, India
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Bhabha Atomic Research Centre, Mumbai, India
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Tata Institute of Fundamental Research-A, Mumbai, India
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Tata Institute of Fundamental Research-B, Mumbai, India
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Indian Institute of Science Education and Research (IISER), Pune, India
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Institute for Research in Fundamental Sciences (IPM), Tehran, Iran
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University College Dublin, Dublin, Ireland
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INFN Sezione di Bari, Università di Bari, Politecnico di Bari, Bari, Italy
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INFN Sezione di Bologna, Università di Bologna, Bologna, Italy
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INFN Sezione di Catania, Università di Catania, Catania, Italy
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INFN Sezione di Firenze, Università di Firenze, Firenze, Italy
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INFN Laboratori Nazionali di Frascati, Frascati, Italy
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INFN Sezione di Genova, Università di Genova, Genoa, Italy
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INFN Sezione di Milano-Bicocca, Università di Milano-Bicocca, Milan, Italy
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INFN Sezione di Napoli, Università di Napoli ’Federico II’ , Napoli, Italy, Università della Basilicata, Potenza, Italy, Università G. Marconi, Rome, Italy
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INFN Sezione di Padova, Università di Padova, Padova, Italy, Università di Trento, Trento, Italy
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INFN Sezione di Pavia, Università di Pavia, Pavia, Italy
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INFN Sezione di Perugia, Università di Perugia, Perugia, Italy
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INFN Sezione di Pisa, Università di Pisa, Scuola Normale Superiore di Pisa, Pisa, Italy
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INFN Sezione di Roma, Sapienza Università di Roma, Rome, Italy
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INFN Sezione di Torino, Università di Torino, Turin, Italy, Università del Piemonte Orientale, Novara, Italy
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INFN Sezione di Trieste, Università di Trieste, Trieste, Italy
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Kyungpook National University, Taegu, Korea
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Chonbuk National University, Chonju, Korea
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Chonnam National University, Institute for Universe and Elementary Particles, Kwangju, Korea
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Hanyang University, Seoul, Korea
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Korea University, Seoul, Korea
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Seoul National University, Seoul, Korea
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University of Seoul, Seoul, Korea
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Sungkyunkwan University, Suwon, Korea
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Vilnius University, Vilnius, Lithuania
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National Centre for Particle Physics, Universiti Malaya, Kuala Lumpur, Malaysia
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Centro de Investigacion y de Estudios Avanzados del IPN, Mexico City, Mexico
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Universidad Iberoamericana, Mexico City, Mexico
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Benemerita Universidad Autonoma de Puebla, Puebla, Mexico
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Universidad Autónoma de San Luis Potosí, San Luis Potosí, Mexico
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University of Auckland, Auckland, New Zealand
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University of Canterbury, Christchurch, New Zealand
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National Centre for Physics, Quaid-I-Azam University, Islamabad, Pakistan
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National Centre for Nuclear Research, Swierk, Poland
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Institute of Experimental Physics, Faculty of Physics, University of Warsaw, Warsaw, Poland
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Laboratório de Instrumentação e Física Experimental de Partículas, Lisbon, Portugal
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Joint Institute for Nuclear Research, Dubna, Russia
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Petersburg Nuclear Physics Institute, Gatchina, St. Petersburg, Russia
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Institute for Nuclear Research, Moscow, Russia
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Institute for Theoretical and Experimental Physics, Moscow, Russia
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Moscow Institute of Physics and Technology, Moscow, Russia
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National Research Nuclear University ‘Moscow Engineering Physics Institute’ (MEPhI), Moscow, Russia
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P.N. Lebedev Physical Institute, Moscow, Russia
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Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, Moscow, Russia
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Novosibirsk State University (NSU), Novosibirsk, Russia
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State Research Center of Russian Federation, Institute for High Energy Physics, Protvino, Russia
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University of Belgrade, Faculty of Physics and Vinca Institute of Nuclear Sciences, Belgrade, Serbia
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Centro de Investigaciones Energéticas Medioambientales y Tecnológicas (CIEMAT), Madrid, Spain
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Universidad Autónoma de Madrid, Madrid, Spain
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Universidad de Oviedo, Oviedo, Spain
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Instituto de Física de Cantabria (IFCA), CSIC-Universidad de Cantabria, Santander, Spain
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CERN, European Organization for Nuclear Research, Geneva, Switzerland
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Paul Scherrer Institut, Villigen, Switzerland
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ETH Zurich-Institute for Particle Physics, and Astrophysics (IPA), Zurich, Switzerland
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Universität Zürich, Zurich, Switzerland
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National Central University, Chung-Li, Taiwan
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National Taiwan University (NTU), Taipei, Taiwan
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Chulalongkorn University, Faculty of Science, Department of Physics, Bangkok, Thailand
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Çukurova University Physics Department, Science and Art Faculty, Adana, Turkey
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Middle East Technical University, Physics Department, Ankara, Turkey
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Bogazici University, Istanbul, Turkey
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Istanbul Technical University, Istanbul, Turkey
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Institute for Scintillation Materials of National Academy of Science of Ukraine, Kharkov, Ukraine
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National Scientific Center, Kharkov Institute of Physics and Technology, Kharkov, Ukraine
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University of Bristol, Bristol, UK
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Rutherford Appleton Laboratory, Didcot, UK
128
Imperial College, London, UK
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Brunel University, Uxbridge, UK
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Baylor University, Waco, USA
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Catholic University of America, Washington, DC, USA
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The University of Alabama, Tuscaloosa, USA
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Boston University, Boston, USA
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Brown University, Providence, USA
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University of California, Davis, Davis, USA
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University of California, Los Angeles, USA
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University of California, Riverside, Riverside, USA
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University of California, San Diego, La Jolla, USA
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University of California, Santa Barbara-Department of Physics, Santa Barbara, USA
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California Institute of Technology, Pasadena, USA
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Carnegie Mellon University, Pittsburgh, USA
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University of Colorado Boulder, Boulder, USA
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Cornell University, Ithaca, USA
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Fairfield University, Fairfield, USA
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Fermi National Accelerator Laboratory, Batavia, USA
146
University of Florida, Gainesville, USA
147
Florida International University, Miami, USA
148
Florida State University, Tallahassee, USA
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Florida Institute of Technology, Melbourne, USA
150
University of Illinois at Chicago (UIC), Chicago, USA
151
The University of Iowa, Iowa City, USA
152
Johns Hopkins University, Baltimore, USA
153
The University of Kansas, Lawrence, USA
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Kansas State University, Manhattan, USA
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Lawrence Livermore National Laboratory, Livermore, USA
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University of Maryland, College Park, USA
157
Massachusetts Institute of Technology, Cambridge, USA
158
University of Minnesota, Minneapolis, USA
159
University of Mississippi, Oxford, USA
160
University of Nebraska-Lincoln, Lincoln, USA
161
State University of New York at Buffalo, Buffalo, USA
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Northeastern University, Boston, USA
163
Northwestern University, Evanston, USA
164
University of Notre Dame, Notre Dame, USA
165
The Ohio State University, Columbus, USA
166
Princeton University, Princeton, USA
167
University of Puerto Rico, Mayaguez, USA
168
Purdue University, West Lafayette, USA
169
Purdue University Northwest, Hammond, USA
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Rice University, Houston, USA
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University of Rochester, Rochester, USA
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The Rockefeller University, New York, USA
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Rutgers, The State University of New Jersey, Piscataway, USA
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University of Tennessee, Knoxville, USA
175
Texas A&M University, College Station, USA
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Texas Tech University, Lubbock, USA
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Vanderbilt University, Nashville, USA
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University of Virginia, Charlottesville, USA
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Wayne State University, Detroit, USA
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University of Wisconsin-Madison, Madison, WI, USA
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CERN, 1211, Geneva 23, Switzerland
* e-mail: cms-publication-committee-chair@cern.ch
Received:
9
October
2017
Accepted:
5
March
2018
Published online:
21
March
2018
Events with no charged particles produced between the two leading jets are studied in proton-proton collisions at
. The jets were required to have transverse momentum 
and pseudorapidity 
, and to have values of 
with opposite signs. The data used for this study were collected with the CMS detector during low-luminosity running at the LHC, and correspond to an integrated luminosity of 8
. Events with no charged particles with 
in the interval 
between the jets are observed in excess of calculations that assume no color-singlet exchange. The fraction of events with such a rapidity gap, amounting to 0.5–1% of the selected dijet sample, is measured as a function of the 
of the second-leading jet and of the rapidity separation between the jets. The data are compared to previous measurements at the Tevatron, and to perturbative quantum chromodynamics calculations based on the Balitsky–Fadin–Kuraev–Lipatov evolution equations, including different models of the non-perturbative gap survival probability.
Key words: CMS / Physics / QCD / Diffraction
© CERN for the benefit of the CMS collaboration, 2018
