Eur. Phys. J. C (2010) 68: 109-118
https://doi.org/10.1140/epjc/s10052-010-1336-0

Regular Article - Experimental Physics

Study of multi-muon events produced in interactions at  TeV

¹ Institute of Physics, Academia Sinica, Taipei, Taiwan, 11529, Republic of China
² Argonne National Laboratory, Argonne, IL, 60439, USA
³ University of Athens, 157 71, Athens, Greece
⁴ Baylor University, Waco, TX, 76798, USA
⁵ Istituto Nazionale di Fisica Nucleare Bologna, 40127, Bologna, Italy
⁶ Istituto Nazionale di Fisica Nucleare Bologna, University of Bologna, 40127, Bologna, Italy
⁷ Brandeis University, Waltham, MA, 02254, USA
⁸ University of California, Davis, CA, 95616, USA
⁹ University of California, Santa Barbara, CA, 93106, USA
¹⁰ Instituto de Fisica de Cantabria, CSIC-University of Cantabria, 39005, Santander, Spain
¹¹ Carnegie Mellon University, Pittsburgh, PA, 15213, USA
¹² Enrico Fermi Institute, University of Chicago, Chicago, IL, 60637, USA
¹³ Comenius University, 842 48, Bratislava, Slovakia
¹⁴ Institute of Experimental Physics, 040 01, Kosice, Slovakia
¹⁵ Joint Institute for Nuclear Research, 141980, Dubna, Russia
¹⁶ Duke University, Durham, NC, 27708, USA
¹⁷ Fermi National Accelerator Laboratory, Batavia, IL, 60510, USA
¹⁸ University of Florida, Gainesville, FL, 32611, USA
¹⁹ Laboratori Nazionali di Frascati, Istituto Nazionale di Fisica Nucleare, 00044, Frascati, Italy
²⁰ University of Geneva, 1211, Geneva 4, Switzerland
²¹ Glasgow University, Glasgow, G12 8QQ, UK
²² Harvard University, Cambridge, MA, 02138, USA
²³ Division of High Energy Physics, Department of Physics, University of Helsinki and Helsinki Institute of Physics, 00014, Helsinki, Finland
²⁴ University of Illinois, Urbana, IL, 61801, USA
²⁵ The Johns Hopkins University, Baltimore, MD, 21218, USA
²⁶ Center for High Energy Physics, Kyungpook National University, Daegu, 702-701, Korea
²⁷ Seoul National University, Seoul, 151-742, Korea
²⁸ Sungkyunkwan University, Suwon, 440-746, Korea
²⁹ Korea Institute of Science and Technology Information, Daejeon, 305-806, Korea
³⁰ Chonnam National University, Gwangju, 500-757, Korea
³¹ University College London, London, WC1E 6BT, UK
³² Centro de Investigaciones Energeticas Medioambientales y Tecnologicas, 28040, Madrid, Spain
³³ Massachusetts Institute of Technology, Cambridge, MA, 02139, USA
³⁴ University of Michigan, Ann Arbor, MI, 48109, USA
³⁵ Michigan State University, East Lansing, MI, 48824, USA
³⁶ University of New Mexico, Albuquerque, NM, 87131, USA
³⁷ Northwestern University, Evanston, IL, 60208, USA
³⁸ The Ohio State University, Columbus, OH, 43210, USA
³⁹ Okayama University, Okayama, 700-8530, Japan
⁴⁰ Osaka City University, Osaka, 588, Japan
⁴¹ Istituto Nazionale di Fisica Nucleare, Sezione di Padova-Trento, 35131, Padova, Italy
⁴² Istituto Nazionale di Fisica Nucleare, University of Padova, 35131, Padova, Italy
⁴³ LPNHE, Universite Pierre et Marie Curie/IN2P3-CNRS, UMR7585, Paris, 75252, France
⁴⁴ Istituto Nazionale di Fisica Nucleare Pisa, 56127, Pisa, Italy
⁴⁵ Istituto Nazionale di Fisica Nucleare Pisa, University of Pisa, 56127, Pisa, Italy
⁴⁶ Istituto Nazionale di Fisica Nucleare Pisa, University of Siena, 56127, Pisa, Italy
⁴⁷ Istituto Nazionale di Fisica Nucleare Pisa, Scuola Normale Superiore, 56127, Pisa, Italy
⁴⁸ University of Pittsburgh, Pittsburgh, PA, 15260, USA
⁴⁹ Purdue University, West Lafayette, IN, 47907, USA
⁵⁰ University of Rochester, Rochester, NY, 14627, USA
⁵¹ The Rockefeller University, New York, NY, 10021, USA
⁵² Istituto Nazionale di Fisica Nucleare Trieste/Udine, 34100, Trieste, Italy
⁵³ University of Trieste/Udine, 33100, Udine, Italy
⁵⁴ Tufts University, Medford, MA, 02155, USA
⁵⁵ Waseda University, Tokyo, 169, Japan
⁵⁶ Wayne State University, Detroit, MA, 48201, USA

^* e-mail: ptohos@fnal.gov

Received: 17 August 2009
Revised: 27 January 2010
Published online: 12 June 2010

Abstract

We report the results of a study of multi-muon events produced at the Fermilab Tevatron collider and acquired with the CDF II detector using a dedicated dimuon trigger. The production cross section and kinematics of events in which both muon candidates are produced inside the beam pipe of radius 1.5 cm are successfully modeled by known processes which include heavy flavor production. In contrast, we are presently unable to fully account for the number and properties of the remaining events, in which at least one muon candidate is produced outside of the beam pipe, in terms of the same understanding of the CDF II detector, trigger, and event reconstruction.