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Search for $\Theta^+(1540)$ pentaquark in high statistics measurement of $\gamma p \to \bar K^0 K^+ n$ at CLAS
High Energy Physics - Experiment · Submitted 22 Oct 2005
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim No evidence for the $\Theta^+$ pentaquark was found.
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The paper's own sentences, arranged. Each label is drawn from a closed vocabulary; the number beside it is the probability the classifier gave that label. Numbers in the tables are the authors', checked by code. No sentence in this record was written by a model.
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The abstract, sentence by sentence
The exclusive reaction $\gamma p \to \bar K^0 K^+ n$ was studied in the photon energy range between 1.6-3.8 GeV searching for evidence of the exotic baryon $\Theta^+(1540)\to nK^+$. The decay to $nK^+$ requires the assignment of strangeness $S=+1$ to any observed resonance. Data were collected with the CLAS detector at the Thomas Jefferson National Accelerator Facility corresponding to an integrated luminosity of 70 $pb^{-1}$. No evidence for the $\Theta^+$ pentaquark was found. Upper limits were set on the production cross section as function of center-of-mass angle and $nK^+$ mass. The 95% CL upper limit on the total cross section for a narrow resonance at 1540 MeV was found to be 0.8 nb.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | The exclusive reaction $\gamma p \to \bar K^0 K^+ n$ was studied in the photon energy range between 1.6-3.8 GeV searching for evidence of the exotic baryon $\Theta^+(1540)\to nK^+$. | contribution 0.95 | 0.94 | 0.04 | asserted 0.92 |
| s1 | The decay to $nK^+$ requires the assignment of strangeness $S=+1$ to any observed resonance. | background 0.68 | 0.18 | 0.02 | asserted 1.00 |
| s2 | Data were collected with the CLAS detector at the Thomas Jefferson National Accelerator Facility corresponding to an integrated luminosity of 70 $pb^{-1}$. | method 1.00 | 0.95 | 0.02 | asserted 1.00 |
| s3 | No evidence for the $\Theta^+$ pentaquark was found. | result 1.00 | 0.96 | 0.96 | asserted 1.00 |
| s4 | Upper limits were set on the production cross section as function of center-of-mass angle and $nK^+$ mass. | result 0.92 | 0.95 | 0.07 | asserted 1.00 |
| s5 | The 95% CL upper limit on the total cross section for a narrow resonance at 1540 MeV was found to be 0.8 nb. | result 1.00 | 0.96 | 0.22 | asserted 1.00 |
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The paper
Original abstract
The exclusive reaction $\gamma p \to \bar K^0 K^+ n$ was studied in the photon energy range between 1.6-3.8 GeV searching for evidence of the exotic baryon $\Theta^+(1540)\to nK^+$. The decay to $nK^+$ requires the assignment of strangeness $S=+1$ to any observed resonance. Data were collected with the CLAS detector at the Thomas Jefferson National Accelerator Facility corresponding to an integrated luminosity of 70 $pb^{-1}$. No evidence for the $\Theta^+$ pentaquark was found. Upper limits were set on the production cross section as function of center-of-mass angle and $nK^+$ mass. The 95% CL upper limit on the total cross section for a narrow resonance at 1540 MeV was found to be 0.8 nb.
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References
How the literature uses it
5 arXiv papers cite this in 12 sentences
Papers whose main result relates to this one's
States the same result 10 papers
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No evidence for this resonance was found in our data sample which contains 13 millions $K^0_s \to \pi^+\pi^- $ decays above background.
Search for the pentaquark candidate $\Theta^+$(1540) in the hyperon beam experiment WA89 · 0.99
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No peak structure corresponding to the $\Theta^+$ mass was observed.
Search for the $\Theta^{+}$ pentaquark via the $\pi^-p\to K^-X$ reaction at 1.92 GeV/$c$ · 0.98
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We see no evidence for a narrow peak in the K0,p mass distribution near 1.54 GeV/c among 106,000 K0,p candidates, and obtain an upper limit for the fraction of Theta+(1.54) to K0,p candidates of <0.3% at 90% confidence.
High Statistics Search for the Theta+(1.54) Pentaquark State · 0.93
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No significant structure was observed in the missing mass spectra.
Search for Pentaquark Theta+ in Hadronic Reaction at J-PARC · 0.93
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No $\Theta(1540)$ signal, the pentaquark candidate, is observed, and the upper limits are set.
Pentaquark Search and Other Multiquark Candidates at BES · 0.90
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Negative results of the search for the pentaquark $\Theta(1540)^+$ are also presented
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No evidence for the $\Theta^+$ pentaquark was found in the $nK^+$ or $pK_S$ invariant mass spectra.
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No evidence for the pentaquark states is found and upper limits on the rate of $\Theta^+(1540)$ and $\Xi_5^{--}(1860)$ production in $e^+e^-$ annihilation are obtained.
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It has been found that the pi+ Lambda missing-mass spectrum displays no significant signal expected from the Theta+(1540) excitation.
Investigation of the reaction pp->p K0 pi+ Lambda in search of the pentaquark · 0.81
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No statistically significant structures were observed in the nK+ invariant mass distribution.
Search for the Theta+ pentaquark in the gamma d -> Lambda n K+ reaction measured with CLAS · 0.80
Papers citing it · 11 sentences without a confident label
Uses its data or values 1 paper
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In fact, Ref. [ref] found the total cross section for the $Θ^+$ in the $γp→K̅^0 K^+ n$ reaction to be 0.8 nb in the $95 %$ CL upper limit.
Vector transition form factors of the $N K^*\to\Theta^+ $ and $N \bar{K}^*\to \Sigma_{\bar{10}}^{*-}$ in the SU(3) chiral quark-soliton model · Introduction · 0.90
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