Charm production in neutral current neutrino-nucleus scattering within the color dipole approach

Machado, M. M.; Machado, M. V. T.

doi:10.1590/s0103-97332008000400020

Cited by 3 publications

(4 citation statements)

References 11 publications

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“…The parameters (σ 0 , x 0 ) were obtained from a fit to the HERA data [21][22]. We take λ c = 0.558±0.038, which is an optimal value of the parameter λ in charm production for m c = 1.3 GeV (as accompanied with statistical error ) [13].…”

Section: Results and Conclusionmentioning

confidence: 99%

Geometrical scaling in charm structure function ratios

Boroun

Rezaei

2014

Nuclear Physics A

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By using a Laplace-transform technique, we solve the next-to-leading-order master equation for charm production and derive a compact formula for the ratio $R^{c}=\frac{F^{^{c\overline{c}}}_L}{F^{^{c\overline{c}}}_2}$, which is useful for extracting the charm structure function from the reduced charm cross section, in particular, at DESY HERA, at small x. Our results show that this ratio is independent of xat small x. In this method of determining the ratios, we apply geometrical scaling in charm production in deep inelastic scattering (DIS). Our analysis shows that the renormalization scales have a sizable impact on the ratio Rcat high $Q^{2}$. Our results for the ratio of the charm structure functions are in a goodagreement with some phenomenological models.Comment: 10 pages, 3 figures. arXiv admin note: text overlap with arXiv:hep-ph/9807263 by other author

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Section: Results and Conclusionmentioning

confidence: 99%

Geometrical scaling in charm structure function ratios

Boroun

Rezaei

2014

Nuclear Physics A

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“…For the pion there are four independent pion DAs defined in (21)(22)(23), 0 ψ (y) γ µ γ 5 ψ (x) π(q) = if π ˆ1 0 du e i(up•y+ūp•x)…”

Section: Pion Dasmentioning

confidence: 99%

“…After the dipole is formed, it scatters in the field of the target and then fluctuates back to the final hadron [7]. Recently the color dipole approach has been successfully applied to the description of different reactions with vector currents (see [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27] and references therein).…”

Section: Introductionmentioning

confidence: 99%

Neutrino production of single pions: Dipole description

2011

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The light-cone distribution amplitudes for the axial current are derived within the instanton vacuum model (IVM), which incorporates nonperturbative effects including spontaneous chiral symmetry breaking. This allows to extend applicability of the dipole approach, usually used in the perturbative domain, down to Q 2 → 0, where partially conserved axial current (PCAC) imposes a relation between the neutrino-production cross section and the one induced by pions. A dramatic breakdown of the Adler relation (AR) for diffractive neutrino-production of pions, caused by absorptive corrections, was revealed recently in [1]. Indeed, comparing with the cross section predicted by the dipole phenomenology at Q 2 → 0 on a proton target we confirmed the sizable deviation from the value given by the AR, as was estimated in [1] within a simplified two-channel model. The dipole approach also confirms that in the black-disc limit, where the absorptive corrections maximize, the diffractive cross section ceases, on the contrary to the expectation based on PCAC.

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“…[25][26][27][28][29][30][31]) giving a reasonable description of the total and differential cross sections. Also, the color-dipole model has been applied to the description of the neutrino physics in [32][33][34][35][36][37][38][39]. Single-pion production by neutrinos on a proton target has been studied recently within the colordipole approach in [40].…”

Section: Introductionmentioning

confidence: 99%

Diffractive neutrino production of pions on nuclei: Adler relation within the color-dipole description

2012

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Effects of coherence in neutrino production of pions off nuclei are studied employing the color-dipole representation and path integral technique. If the nucleus remains intact, the process is controlled by the interplay of two length scales. One is related to the pion mass and is quite long (at low Q 2 ), while the other, associated with heavy axial-vector states, is much shorter. The Adler relation is found to be broken at all energies, but especially strongly at * 10 GeV, where the cross section is suppressed by a factor $A À1=3 . On the contrary, in a process where the recoil nucleus breaks up into fragments, the Adler relation turns out to be strongly broken at low energies, where the cross section is enhanced by a factor $A 1=3 , but has a reasonable accuracy at higher energies, where all the coherence length scales become long.

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Charm production in neutral current neutrino-nucleus scattering within the color dipole approach

Cited by 3 publications

References 11 publications

Geometrical scaling in charm structure function ratios

Geometrical scaling in charm structure function ratios

Neutrino production of single pions: Dipole description

Diffractive neutrino production of pions on nuclei: Adler relation within the color-dipole description

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