Measurement of prompt J/ψ pair production in pp collisions at √s = 7 Tev

Vardan Khachatryan; Felix Bachmair; Lukas Bäni; Lorenzo Bianchini; Pierluigi Bortignon; Marco A Buchmann; Bruno Casal; Nicolas Chanon; Amanda Deisher; Günther Dissertori; Michael Dittmar; Mauro Donegà; Marc Dünser; Philipp Eller; Christoph Grab; Dmitry Hits; Werner Lustermann; Boris Mangano; Andrea C Marini; Pablo Martinez Ruiz Del Arbol; Daniel Meister; Niklas Mohr; Christoph Nägeli; Francesca Nessi-Tedaldi; Francesco Pandolfi; Felicitas Pauss; Marco Peruzzi; Milena Quittnat; Liis Rebane; Marco Rossini; Andrey Starodumov; Maiko Takahashi; Konstantinos Theofilatos; Rainer Wallny; H. A Weber; CMS Collaboration

doi:10.1007/JHEP09(2014)094

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Measurement of prompt J/ψ pair production in pp collisions at √s = 7 Tev

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Measurement of prompt J/ψ pair production in pp collisions at √s = 7 Tev

Vardan Khachatryan, Felix Bachmair, Lukas Bäni, Lorenzo Bianchini, Pierluigi Bortignon, Marco A Buchmann, Bruno Casal, Nicolas Chanon, Amanda Deisher, Günther Dissertori, …

The journal of high energy physics, Vol.2014(9), 94

09/01/2014

DOI: 10.1007/JHEP09(2014)094

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Abstract

Production of prompt J/ψ meson pairs in proton-proton collisions at s√ = 7 TeV is measured with the CMS experiment at the LHC in a data sample corresponding to an integrated luminosity of about 4.7 fb−1. The two J/ψ mesons are fully reconstructed via their decays into μ + μ − pairs. This observation provides for the first time access to the high-transverse-momentum region of J/ψ pair production where model predictions are not yet established. The total and differential cross sections are measured in a phase space defined by the individual J/ψ transverse momentum (p T J/ψ ) and rapidity (|y J/ψ |): |y J/ψ | < 1.2 for p T J/ψ > 6.5 GeV/c; 1.2 < |y J/ψ | < 1.43 for a p T threshold that scales linearly with |y J/ψ | from 6.5 to 4.5 GeV/c; and 1.43 < |y J/ψ | < 2.2 for p T J/ψ > 4.5 GeV/c. The total cross section, assuming unpolarized prompt J/ψ pair production is 1.49 ± 0.07 (stat) ±0.13 (syst) nb. Different assumptions about the J/ψ polarization imply modifications to the cross section ranging from −31% to +27%.

High Energy Physics

B physics

Experiment

Hadron

Hadron scattering

Nuclear Experiment

Details

Title: Subtitle: Measurement of prompt J/ψ pair production in pp collisions at √s = 7 Tev
Creators: Vardan Khachatryan
Felix Bachmair
Lukas Bäni
Lorenzo Bianchini
Pierluigi Bortignon
Marco A Buchmann
Bruno Casal
Nicolas Chanon
Amanda Deisher
Günther Dissertori
Michael Dittmar
Mauro Donegà
Marc Dünser
Philipp Eller
Christoph Grab
Dmitry Hits
Werner Lustermann
Boris Mangano
Andrea C Marini
Pablo Martinez Ruiz Del Arbol
Daniel Meister
Niklas Mohr
Christoph Nägeli
Francesca Nessi-Tedaldi
Francesco Pandolfi
Felicitas Pauss
Marco Peruzzi
Milena Quittnat
Liis Rebane
Marco Rossini
Andrey Starodumov
Maiko Takahashi
Konstantinos Theofilatos
Rainer Wallny
H. A Weber - RWTH Aachen University
CMS Collaboration
Contributors: Y Onel (Contributor) - University of Iowa, Physics and Astronomy
Resource Type: Journal article
Publication Details: The journal of high energy physics, Vol.2014(9), 94
DOI: 10.1007/JHEP09(2014)094
ISSN: 1126-6708
eISSN: 1029-8479
Publisher: Springer
Language: English
Date published: 09/01/2014
Academic Unit: Physics and Astronomy
Record Identifier: 9984199956502771

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