New Charm-Current Effects in Neutrino Scattering

Barger, V.; Weiler, Thomas J.; Phillips, R. J.

doi:10.1103/physrevlett.35.692

Cited by 23 publications

(4 citation statements)

References 11 publications

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“…The results described here correspond to a slow rescaling and are drastically different from previous work which assumed a fast rescaling. 11,12 Only with this slow rescaling is good agreement obtained with all available data.In the quark-parton model, it is assumed that the structure functions F(z) are functions only of d 2 o dxdy =F{"'-iK <>-$)]}'.<»"-* the scaling variable z. z is defined as the fraction of the target nucleon's momentum which is carried by the struck quark 0 It is further assumed that the quarks are quasifree so that the produced quark is on mass-shell. If the exchanged W boson has momentum k, the struck quark has momentum zp, and the produced mass is neglected, then one finds…”

supporting

confidence: 69%

See 1 more Smart Citation

Evidence for New Quarks and New Currents

Barnett

1976

Phys. Rev. Lett.

186

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The quark-parton model is used to study neutrino scattering in the case where the mass of a heavy, produced quark is not neglected. Evidence for right-handed currents is found in the charged-current neutrino scattering data. The masses of produced heavy quarks are estimated.There have been hints in the data of the Harvard University-University of Pennsylvania-University of Wisconsin-Fermilab (HPWF) and the California Institute of Technology-Fermilab (CT-F) collaborations 1 " 9 of new phenomena in charged-current neutrino scattering. By not neglecting the mass 10 of a heavy produced quark in the quark-parton model, it is possible to show that the V data contain substantial evidence of a quark d' of mass 4-5 GeV/c 2 with a right-handed coupling to u quarks. If there is a quark u' with a right-handed coupling to d quarks, its mass is greater than or equal to 3 GeV/c 2 . The d' and u' quarks have charges -\ and +- §, respectively.Crucial to understanding the energy dependence of the V cross sections and of their anomalous y dependence is the manner in which scaling is reassumed after passing quark mass thresholds. The results described here correspond to a slow rescaling and are drastically different from previous work which assumed a fast rescaling. 11,12 Only with this slow rescaling is good agreement obtained with all available data.In the quark-parton model, it is assumed that the structure functions F(z) are functions only of d 2 o dxdy =F{"'-iK <>-$)]}'.<»"-* the scaling variable z. z is defined as the fraction of the target nucleon's momentum which is carried by the struck quark 0 It is further assumed that the quarks are quasifree so that the produced quark is on mass-shell. If the exchanged W boson has momentum k, the struck quark has momentum zp, and the produced mass is neglected, then one findsThe quantity x can be measured experimentally, so that in this case z is known. However, for heavy, produced quarks (m a »0.3 GeV/c 2 ), it is not reasonable to neglect their mass and then z cannot be directly measured. Rather, when m Q is kept, it follows from Eq. (1) that <=^)-where y = (E -E f )/E, E (£') is the incoming (outgoing) lepton energy, and M is the nucleon mass. Then calculating the cross section and observing that the Callan-Gross relation 13 must be written in terms of z not x, one obtains (3) 1163

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supporting

confidence: 69%

supporting

confidence: 69%

Evidence for New Quarks and New Currents

Barnett

1976

Phys. Rev. Lett.

186

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“…This agrees well with the trajectory obtained either from the Chebv-Frautschi plot or from the high energy data. Similarly the residue function, calculated from the lowest moment sum rule, has been shown (Dolen et a1 1968, Barger and Phillips 1969a, Harari and Zarmi 1969 to agree very well with the high energy estimates in the negative t region and with the on-shell coupling constant at t = mp2. I n particular the zeros of the baryon resonance terms (associated with the first zeros of the corresponding Legendre functions), as displayed in figure 11 (Berger and Fox 1970), all lie in the t range of -0.4 to -0.6 GeV2.…”

Section: Regge Parameterssupporting

confidence: 61%

Duality

Phillips¹,

Roy²

1974

Rep. Prog. Phys.

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I n elementary particle physics, low energy interactions are characterized by resonance formation and high energy interactions by Regge pole exchanges : two quite different and apparently unrelated mechanisms. Duality is the hypothesis that they are in fact simply and quantitatively related. T h e present review describes the background and motivation for this hypothesis, and the different degrees of severity with which it can be formulated, together with some of its most notable predictions. Applications to the scattering amplitude are discussed in 0 3 ; the most significant results being exchange degeneracy for high energy scattering and the Regge interpolation of resonances at low energy. Section 4 describes applications to particle classification. Duality constraints tie together several SU(3) multiplets, like a higher symmetry scheme ; the exoticity prediction for the baryon-antibaryon channel is discussed in detail. Section 5 describes duality diagrams that provide a simple prescription for deriving most of the duality results. Section 6 is about the Veneziano model, a simple form of amplitude that satisfies duality explicitly; extensions to multiparticle scattering are also sketched. T h e final section discusses applications of duality to the inclusive reaction, which is a field of immense activity at present. The most significant results are again exchange degeneracy and the Regge interpolation of resonances-this time for the regions of high and low missing mass.

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“…We note that a slightly larger value has been obtained in Ref. [37]. The phi-nucleon scattering does not change the phi meson yield, but affects its momentum distribution.…”

Section: Phi Meson Scattering By Nucleonsmentioning

confidence: 45%

Phi meson production in heavy-ion collisions at SIS energies

Chung

1997

Nuclear Physics A

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Phi meson production in heavy-ion collisions at SIS/GSI energies (∼ 2 GeV/nucleon) is studied in the relativistic transport model. We include contributions from baryon-baryon, pion-baryon, and kaon-antikaon collisions.The cross sections for the first two processes are obtained in an one-bosonexchange model, while that for the last process is taken to be of Breit-Wigner form through the phi meson resonance. The dominant contribution to phi meson production in heavy ion collisions at these energies is found to come from secondary pion-nucleon collisions. Effects due to medium modifications of kaon masses are also studied and are found to reduce the phi meson yield by about a factor of two, mainly because of increased phi decay width as a result of dropping kaon-antikaon masses. In this case, the φ/K − ratio is about 4%, which is a factor of 2-3 below preliminary experimental data from the FOPI collaboration at GSI. Including also the reduction of phi meson mass in medium increases this ratio to about 8%, which is then in reasonable agreement with the data.

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New Charm-Current Effects in Neutrino Scattering

Cited by 23 publications

References 11 publications

Evidence for New Quarks and New Currents

Evidence for New Quarks and New Currents

Duality

Phi meson production in heavy-ion collisions at SIS energies

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