Evidence for Narrow Baryon Resonances in Inelastic<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="italic">pp</mml:mi></mml:math>Scattering

Tatischeff, B.; Yonnet, Jean‐Paul; Willis, N.; Boivin, M.; Comets, M. P.; Courtat, P.; Gacougnolle, R.; Bornec, Y. Le; Loireleux, E.; Reide, F.

doi:10.1103/physrevlett.79.601

Cited by 24 publications

(64 citation statements)

References 32 publications

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“…In this work, the authors brought out three such states with masses 1004, 1044, and 1094 MeV. Taking into account the found connection between the SNDs and the resonance-like states X 1 , it is possible to assume that the peaks, observed in [7] are not the excited nucleons, but they are resonance-like states X 1 caused by possible existence and decay of SNDs with the masses 1942, 1982, and 2033 MeV, respectively.…”

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confidence: 99%

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Fishing for narrow dibaryons in pd→pX reaction

Filʼkov¹,

Kashevarov²,

Konobeevski³

et al. 2000

AIP Conference Proceedings

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Abstract. An analysis of new experimental data, obtained at Linear Accelerator of INR, is carried out with the aim of searching for supernarrow dibaryons in the reactions pd → p + X and pd → p + pX 1 . Dibaryons with masses 1904±2, 1926±2, and 1942±2 MeV have been observed in missing mass M X spectra. In missing mass M X1 spectra, the resonancelike states X 1 = γ + n at M X1 = 966 ± 2, 986±2, and 1003±2 MeV have been found. The analysis of the data obtained leads to the conclusion that the observed dibaryons are supernarrow dibaryons, the decay of which into two nucleons is forbidden by the Pauli exclusion principle.In Ref. [1][2][3] the study of the reaction pd → pX was performed with the aim of searching for supernarrow dibaryons (SND), the decay of which into two nucleons is forbidden by the Pauli exclusion principle [4][5][6]. Such dibaryons with the mass M < 2m N + m π can decay into two nucleons, mainly emitting a photon. The experiment was carried out at 305 MeV using the two-arm spectrometer TAMS. As was shown in Ref. [2,3], the nucleons and the deuteron from the decay of SND into γNN and γd have to be emitted in a narrow angle cone with respect to the direction of motion of the dibaryon. On the other hand, if a dibaryon decays mainly into two nucleons, then the expected angular cone of emitted nucleons must be more than 50 • . Therefore, a detection of the scattered proton in coincidence with the proton (or the deuteron) from the decay of particle X at correlated angles allowed to suppress essentially the contribution of the background processes and to increase the relative contribution of a possible SND production. As a result, two narrow peaks in missing mass spectra have been observed at M =1905 and 1924 MeV. The analysis of the angular distributions of the protons from the decay of particle X showed that the peak found at 1905 MeV most likely corresponds to a SND with isotopic spin equal to 1. In Ref.[3] arguments were presented for the resonance at M =1924 MeV is a SND, too.In the present paper we give the results of an analysis of new experimental data

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confidence: 99%

“…It should be noted that a resonance-like behavior of X 1 at M X 1 = 1003 ± 2 MeV corresponds to the resonance found in [7] and attributed to an excited nucleon state N * . In this work, the authors brought out three such states with masses 1004, 1044, and 1094 MeV.…”

mentioning

confidence: 99%

Fishing for narrow dibaryons in pd→pX reaction

Filʼkov¹,

Kashevarov²,

Konobeevski³

et al. 2000

AIP Conference Proceedings

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show abstract

“…In this light the recent claim by Tatischeff et al [7,8] of evidence for low-lying exotic baryons between the nucleon and the ∆ resonance is quite intriguing. Tatischeff et al investigated the pp → pπ + X reaction using the SPES3 spectrometer at the Saturne Synchrotron by detecting the forward-going π + /p pairs from p-p collisions at energies of 1520-2100 MeV.…”

Section: Introductionmentioning

confidence: 90%

Search for exotic baryons in double radiative capture on pionic hydrogen

et al. 2004

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We report a search for low-lying exotic baryons via double radiative capture on pionic hydrogen. The data were collected at the TRIUMF cyclotron using the RMC spectrometer by detecting gamma-ray pairs from pion stops in liquid hydrogen. No evidence was found to support an earlier claim for exotic baryons of masses 1004 and 1044 MeV/c 2 . We obtain upper limits on the branching ratios for double radiative capture via these exotic states of < 3 × 10 −6 and < 4 × 10 −6 respectively.

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“…Initially, in the reaction pp → nX ++ at TRIUMF [4] no baryon was detected with I = 3/2, m N ≤ m X ≤ m N + m π and a production cross-section > 10 −7 of the backward elastic np cross-section (an additional assumption of a long lifetime was used). However, in the reaction pp → pπ + X 0 measured at Saclay [5] several low-mass structures were reported and interpreted as narrow peaks corresponding to new baryons.…”

Section: Introductionmentioning

confidence: 99%

“…Simultaneously, narrow structures with B = 1 were also observed. These could be kinematically related to the dibaryons or correspond to new narrow baryonic states with masses 966, 986, and 1003 MeV [7,8] (the latter state perhaps related to the 1004 MeV structure of [5]). However, an attempt to study one of these reported dibaryons at RCNP, Osaka, in the same reaction, but with stated better mass resolution and better background conditions, showed no statistically significant effect [9], thus possibly casting doubt on both the narrow dibaryons and baryons of [7].…”

Section: Introductionmentioning

confidence: 99%