Preprint/Internal Report

DESY-2013-00586

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Measurement of the production cross section of prompt $\it{J}/\psi$ mesons in association with a $\it{W}^{±}$ boson in $\it{pp}$ collisions at $\sqrt{s} =7$ TeV

ATLAS Collaboration (Collaboration author)

2013

Report No.: ATLAS-CONF-2013-042

Abstract: The process pp !WJ=y provides a powerful probe of the production mechanism ofcharmonium in hadronic collisions, and is also sensitive to multiple parton interactions inthe colliding protons. Using the 2011 ATLAS dataset of 4.6 fb􀀀1 of pp collisions atps = 7TeV, the first observation is made of the production ofW + prompt J=y events in hadroniccollisions where theW boson and the J=y both decay to muons. A total of 29:2+7:5􀀀6:5 W+prompt J=y events are observed, with a statistical significance of 5:3s. The productionrate as a ratio to the inclusiveW boson production rate is measured, and the double partonscattering contribution to the cross section is estimated.

Note: The 9th International Workshop on Heavy Quarkonium 2013, Beijing, China, 22 - 26 Apr 2013Copyright 2013 CERN for the benefit of the ATLAS Collaboration.Reproduction of this article or parts of it is allowed as specified in the CC-BY-3.0 license.

---

Contributing Institute(s):

1. LHC/ATLAS Experiment (ATLAS)

Research Program(s):

1. Experiments at LHC (ATLAS) (POF2-512) (POF2-512)

Experiment(s):

1. LHC: ATLAS

Appears in the scientific report 2013

---

Database coverage:
;

---