2005
DOI: 10.1103/physrevlett.95.152001
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Search for Exotic Baryons in 800 GeVpppΞ±π±XReactions

Abstract: We report the results of a high-statistics, sensitive search for narrow baryon resonances decaying to Xi-pi-, Xi-pi+, Xi+pi-, and Xi+pi+. The only resonances observed are the well known Xi0(1530) and Xi0(1530). No evidence is found for the states near 1862 MeV, previously reported by NA49 [Phys. Rev. Lett. 92, 042003 (2003)]. At the 95% confidence level, we find the upper limit for the production of a Gaussian enhancement with sigma=7.6 MeV in the Xi-pi- effective mass spectrum to be 0.3% of the number of obse… Show more

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Cited by 16 publications
(21 citation statements)
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References 28 publications
(7 reference statements)
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“…In the classical case [20] the neutrino is produced and detected in distinct flavor states (at the astrophysical source and the earth detector) and exists as a quantum mechanical superposition of mass states due the mass states being indistinguishable to the detection process. If the neutrino passes near a massive object, then it might undergo what we described as classical decoherence [23][25] [26]. The different mass states continue to exist and make up the neutrino even if they cease to overlap due to what we describe as propagation decoherence [20].…”
Section: Discussionmentioning
confidence: 99%
See 1 more Smart Citation
“…In the classical case [20] the neutrino is produced and detected in distinct flavor states (at the astrophysical source and the earth detector) and exists as a quantum mechanical superposition of mass states due the mass states being indistinguishable to the detection process. If the neutrino passes near a massive object, then it might undergo what we described as classical decoherence [23][25] [26]. The different mass states continue to exist and make up the neutrino even if they cease to overlap due to what we describe as propagation decoherence [20].…”
Section: Discussionmentioning
confidence: 99%
“…As was claimed in Ref. [23], the gravity-induced quantum state reduction can be tested by observing the neutrino flavor oscillations at cosmological distances, while in Ref. [24] it was regarded as practically undetectable.…”
Section: B Classical Diósi-penrose Decoherencementioning
confidence: 99%
“…However, a deluge of contrary experimental results followed this one positive claim for a cascade pentaquark. At least ten results have been released which repudiate the existence of the states seen by NA-49: from WA-89 [40], CDF [38], HERA-B [36], ALEPH [39], HERMES [41], FOCUS [42], BaBar [43], ZEUS [44], COMPASS [45], and E690/Fermilab [46]. In general, the negative reports have much higher statistics than the original positive report, and came from pp, ep, pA, and γA experiments.…”
Section: Experimental Evidencementioning
confidence: 99%
“…A previous analysis of this kind was proposed in [27], based on the Penrose model of gravity induced collapse [28,29]. This model however lacks a fully consistent dynamical equation, and previous attempts to fill this gap [30] have been criticized [31].…”
Section: Introductionmentioning
confidence: 99%
“…Aim of this work is to understand if, as claimed in [27], neutrino oscillations can be used to test collapse models, and in particular to improve the upper bounds on the collapse strength γ.…”
Section: Introductionmentioning
confidence: 99%