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Comment on the Updated CDF "Ghost" Events
High Energy Physics - Phenomenology · Submitted 18 Jun 2012
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim We conclude that the CDF measurement cannot be described via the annihilation of strongly interacting partons, and thus seems to be in conflict with basic tenets of QCD.
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The abstract, sentence by sentence
In 2008 the CDF Collaboration announced the discovery of an excess of events with two or more muons, dubbed "ghost" events for their unusual properties. In a recent update, CDF finds that the azimuthal angle distribution between the primary (trigger) muons is significantly more back-to-back than that of all known sources of di-muon backgrounds. Here we show that this angular distribution cannot be reproduced in models where the muons are produced in the decays of relatively light X-particles: all models of this kind also predict a much broader distribution than that found by CDF. We conclude that the CDF measurement cannot be described via the annihilation of strongly interacting partons, and thus seems to be in conflict with basic tenets of QCD.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | In 2008 the CDF Collaboration announced the discovery of an excess of events with two or more muons, dubbed "ghost" events for their unusual properties. | background 1.00 | 0.05 | 0.02 | asserted 0.99 |
| s1 | In a recent update, CDF finds that the azimuthal angle distribution between the primary (trigger) muons is significantly more back-to-back than that of all known sources of di-muon backgrounds. | background 0.80 | 0.08 | 0.04 | asserted 1.00 |
| s2 | Here we show that this angular distribution cannot be reproduced in models where the muons are produced in the decays of relatively light X-particles: all models of this kind also predict a much broader distribution than that found by CDF. | result 0.93 | 0.86 | 0.19 | asserted 1.00 |
| s3 | We conclude that the CDF measurement cannot be described via the annihilation of strongly interacting partons, and thus seems to be in conflict with basic tenets of QCD. | interpretation 0.99 | 0.55 | 0.94 | asserted 0.69 |
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The paper
Original abstract
In 2008 the CDF Collaboration announced the discovery of an excess of events with two or more muons, dubbed "ghost" events for their unusual properties. In a recent update, CDF finds that the azimuthal angle distribution between the primary (trigger) muons is significantly more back-to-back than that of all known sources of di-muon backgrounds. Here we show that this angular distribution cannot be reproduced in models where the muons are produced in the decays of relatively light X-particles: all models of this kind also predict a much broader distribution than that found by CDF. We conclude that the CDF measurement cannot be described via the annihilation of strongly interacting partons, and thus seems to be in conflict with basic tenets of QCD.
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What this paper does with the arXiv papers it cites
What it cites · 8 sentences without a confident label
Builds on 1 paper
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The corresponding cross section is [ref]
Hunting for CDF Multi-Muon "Ghost" Events at Collider and Fixed-Target Experiments · Introduction · 0.86
Uses the method or tool of 1 paper
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In order to simulate “ghost” events in Herwig++ [ref] we introduced a rather long–lived bosonic $X$ particle, whose pair production and subsequent decay (with $c τ_X [15]mm$) should be responsible for the primary muon pair. $X$ should be a Majorana particle to account for the equal number of same–sign and opposite–sign primary muon pairs.
Herwig++ Physics and Manual · Introduction · 1.00
Uses data or values from 3 papers
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[ref] for further details.
Hunting for CDF Multi-Muon "Ghost" Events at Collider and Fixed-Target Experiments · Introduction · 0.89
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After reviewing their estimate of the QCD production and investigating a bigger data sample CDF reduced the estimate for the total number of ghost events to $54437 ±14171$ for an integrated luminosity of $[1426]pb^-1$ [ref] .
An additional study of multi-muon events produced in {\boldmath $p\bar{p}$} collisions at {\boldmath $\sqrt{s}=1.96$} TeV · Introduction · 0.96
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[ref] ; the shape of the $δϕ_μμ$ distribution does not depend on the value of this constant.
Study of multi-muon events produced in p-pbar collisions at sqrt(s)=1.96 TeV · Introduction · 0.94
Cites as background 1 paper
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In 2008 the CDF Collaboration announced the discovery of a very large sample of events with two or more muons that could not be explained by known production mechanisms (chiefly heavy flavor and Drell–Yan production) [ref] .
Study of multi-muon events produced in p-pbar collisions at sqrt(s)=1.96 TeV · Introduction · 0.82
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