Annihilation into pions of the $$\bar p$$ n system from antiprotons at rest in deuterium

Bettini, A.; Cresti, M.; Limentani, S.; Peruzzo, L.; Santangelo, R.; Sartori, Sabrina; Bertanza, L.; Bigi, A.; Carrara, R.; Casali, R.; Lariccia, P.

doi:10.1007/bf02738758

Cited by 56 publications

(10 citation statements)

References 8 publications

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“…In particular, the error due to uncertainties in the π-nucleon cross section is 20.0%, as estimated from the π- 16 O scattering data shown in [13] and by comparing results from two independent nuclear interaction programs originally developed by IMB [13] and by Kamiokande [14] (6.1%). The uncertainty from the (n + nucleon) annihilation branching ratios is estimated to be 4.6% by comparing different MC results based on variations in the assumed branching ratios [28,29]. The 0.6% asymmetry in the detector gain and the 2.0% difference in the energy scale between the data and the MC would affect the momentum cut and contribute 1.7% and 0.4% uncertainties, respectively.…”

Section: Systematic Errorsmentioning

confidence: 99%

Search forn−n¯oscillation in Super-Kamiokande

Abe¹,

Hayato²,

Iida³

et al. 2015

Phys. Rev. D

136

177

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2A search for neutron-antineutron (n −n) oscillation was undertaken in Super-Kamiokande using the 1,489 day livetime or 2.45 × 10 34 neutron-year exposure data. This process violates both baryon and (baryon−lepton) numbers by two units and is predicted by a large class of hypothetical models where the seesaw mechanism is incorporated to explain the observed tiny neutrino masses and the matter-antimatter asymmetry in the universe. No evidence for n −n oscillation was found, the lower limit of the lifetime for neutrons bound in 16 O, in an analysis that included all of the significant sources of experimental uncertainties, was determined to be 1.9 × 10 32 years at the 90% confidence level. The corresponding lower limit for the oscillation time of free neutrons was calculated to be 2.7 × 10 8 s using a theoretical value of the nuclear suppression factor of 0.517 × 10 23 s −1 and its uncertainty.

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Section: Systematic Errorsmentioning

confidence: 99%

Search forn−n¯oscillation in Super-Kamiokande

Abe¹,

Hayato²,

Iida³

et al. 2015

Phys. Rev. D

136

177

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“…The fact that the ratio of φ and ω yields in various individual channels exceeds the prediction of the naïve OZI rule has been known for some time. In particular, the bubble chamber data of [26]- [29] onpn annihilation could be combined to estimate…”

Section: Data On φ Production Inpp Annihilation At Restmentioning

confidence: 99%

Abundant φ-meson production in annihilation at rest and strangeness in the nucleon

et al. 1995

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A large apparent violation of the OZI rule has recently been found in many channels inpp annihilation at LEAR. An interpretation of these data in terms of the "shakeout" and "rearrangement" of an intrinsicss component of the nucleon wave function is proposed. This gives a channel-dependent, non-universal modification of the naïve OZI prediction. Within this approach, we interpret the strong excess of φ production in S-wavepp annihilations in terms of the polarization of the nucleon'sss component indicated by deep inelastic lepton-nucleon scattering experiments. This interpretation could be tested by measurements of the f ′ 2 (1525)/f 2 (1270) production ratio in P-wave annihilations and by experiments with polarized beams and polarized targets. We also propose a test of the intrinsic strangeness hypothesis in φ production in high-momentum transfer processes, via a difference in constituent counting rules from gluon-mediated production.

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“…Tt= ~d(P) TA (1) where qd(P) is the deuteron wavefunction, p is the spectator proton momentum, and T~ is the annihilation Td P d p Fig. 1.…”

Section: (I) Tree Approximation and Pion Rescatteringmentioning

confidence: 99%

“…The data for these experiments may be found in [1][2][3][4][5][6][7][8][9][10][11]. The data for these experiments may be found in [1][2][3][4][5][6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Rescattering mechanisms for $$\bar pd \to pX$$ reactions

Fasano

Locher

Nozawa

1991

Z. Physik A - Hadrons and Nuclei

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Inclusive proton spectra for the reactions #d~3rcp, #d ~ 5rcp, and #d ~ KKmrcp are calculated. In addition to nucleon exchange, the rescattering of pions and kaons, and the production and absorption of heavy mesons is evaluated. In the proton spectator momentum regime of 200 to 600 MeV/c, the role of heavy mesons is found to be negligible. The proper counting of the topological variants of pion and kaon rescattering can explain the cross sections with the exception of the #d ~ 3rcp channel.

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Annihilation into pions of the $$\bar p$$ n system from antiprotons at rest in deuterium

Cited by 56 publications

References 8 publications

Search forn−n¯oscillation in Super-Kamiokande

Search forn−n¯oscillation in Super-Kamiokande

Abundant φ-meson production in annihilation at rest and strangeness in the nucleon

Rescattering mechanisms for $$\bar pd \to pX$$ reactions

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