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Observation and properties of the X(3872) decaying to J/ψπ+π- in pp̄ collisions at √s = 1.96 TeV

V. M. Abazov, +604 more
- 15 Oct 2004 - 
- Vol. 93, Iss: 16, pp 162002-162002
TLDR
In this article, the authors reported the observation of the X(3872) in the J/psipi(+)pi(-) channel with decaying to mu(+)mu(-), in p (p) over bar collisions at roots=1.96 TeV.
Abstract: 
We report the observation of the X(3872) in the J/psipi(+)pi(-) channel, with J/psi decaying to mu(+)mu(-), in p (p) over bar collisions at roots=1.96 TeV. Using approximately 230 pb(-1) of data collected with the Run II D0 detector, we observe 522+/-100 X(3872) candidates. The mass difference between the X(3872) state and the J/psi is measured to be 774.9+/-3.1(stat)+/-3.0(syst) MeV/c(2). We have investigated the production and decay characteristics of the X(3872) and find them to be similar to those of the psi(2S) state.

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Heavy quarkonium: progress, puzzles, and opportunities

Nora Brambilla, +69 more
- 08 Feb 2011 - 
TL;DR: The early years of this period were chronicled in the Quarkonium Working Group (QWG) CERN Yellow Report (YR) in 2004, which presented a comprehensive review of the status of the field at that time and provided specific recommendations for further progress as mentioned in this paper.
Journal ArticleDOI

The hidden-charm pentaquark and tetraquark states

H. S. Chen, +4 more
- 09 Jan 2016 - 
TL;DR: Recently, the LHCb Collaboration discovered two hidden-charm pentaquark states, which are also beyond the quark model as discussed by the authors, and investigated various theoretical interpretations of these candidates of the multiquark states.
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Hadronic molecules

Feng-Kun Guo, +5 more
- 29 Apr 2017 - 
TL;DR: In this article, the authors review experimental evidences of various candidates of hadronic molecules, and methods of identifying such structures Nonrelativistic effective field theories are the suitable framework for studying hadronic molecule, and are discussed in both the continuum and finite volumes.
Journal ArticleDOI

Glueballs, Hybrids, Multiquarks. Experimental facts versus QCD inspired concepts

Eberhard Klempt, +1 more
- 01 Dec 2007 - 
TL;DR: In this article, it was shown that the meson σ and κ mesons exhibit a spectrum of (squared) masses which are proportional to the sum of orbital angular momentum and radial quantum numbers.
Journal ArticleDOI

Nonstandard heavy mesons and baryons: Experimental evidence

Stephen Lars Olsen, +2 more
- 08 Feb 2018 - 
TL;DR: Recently, a variety of QCD inspired phenomenological models have been proposed, such as meson-gluon hybrids and pentaquark baryons that contain heavy (charm or bottom) quarks as mentioned in this paper.
References
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Journal ArticleDOI

Isospin breaking of the narrow charmonium state of Belle at 3872 MeV as a deuson

Nils A. Tornqvist
- 24 Jun 2004 - 
TL;DR: The narrow charmonium state near 3872 MeV reported by the Belle Collaboration and confirmed by CDF lies almost exactly at the D 0 D ∗0 threshold as mentioned in this paper.
Journal ArticleDOI

The CDF and DØ Upgrades for Run II

T. LeCompte, +1 more
- 01 Dec 2000 - 
TL;DR: In this paper, the authors discuss the physics goals that motivate these detector enhancements and describe in detail the improvements being made to the charged particle tracking, calorimetry, muon identification, and trigger subsystems of both detectors.

Quarkonium: New Developments

Chris Quigg
TL;DR: In this paper, the influence of open-charm channels on charmonium properties leads to a new spectroscopy of charmed and anticharmed mesons, which can be discovered as narrow resonances of the mesons.
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