Charm of small-x neutrino deep-inelastic scattering

Fiore, R.; Zoller, V. R.

doi:10.1134/s0021364008100020

Cited by 13 publications

(19 citation statements)

References 27 publications

(26 reference statements)

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“…In the neutrino reactions induced by the charm strange current the term is suppressed at high Q 2 ӷ by the factor ~/Q 2 and the scalar/longitudinal structure function F S is dominated by its S wave com ponent, [17,18]. Specific features of the structure functions F λ are illustrated by Fig.…”

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confidence: 99%

Heavy quark currents in ultra-high energy neutrino interactions

Fiore

Zoller

2012

Jetp Lett.

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We discuss heavy quark contributions to the neutrino-nucleon total cross section at very high energies, well above the real top production threshold. The top-bottom weak current is found to generate strong left-right asymmetry of neutrino-nucleon interactions. We separate contributions of different helicity states and make use of the $\bkappa$-factorization to derive simple and practically useful formulas for the left-handed ($F_L$) and right-handed ($F_R$) components of the conventional structure function $2xF_3=F_L-F_R$ in terms of the integrated gluon density. We show that $F_L\gg F_R$ and, consequently, $xF_3\approx F_T$, where $F_T$ is the transverse structure function. The conventional structure function $F_2=F_S+F_T$ at $Q^2\ll m_t^2$ appears to be dominated by its scalar (also known as longitudinal) component $F_S$ and the hierarchy $F_S\gg F_L\gg F_R$ arises naturally. We evaluate the total neutrino-nucleon cross section at ultra-high energies within the color dipole BFKL formalism.Comment: 13 pages, 2 figures, to be published in JETP Letter

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confidence: 99%

Heavy quark currents in ultra-high energy neutrino interactions

Fiore

Zoller

2012

Jetp Lett.

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“…and corresponding z-distribution, dF cs L /dz, develops the parton model peaks at z → 0 and z → 1 [4]. Integrating over z near the endpoint z = 1 in (6) yields [5] dz|Ψ cs (z, r)…”

Section: Moderate Q 2 : Asymmetric Cs-states and P-wave Dominancementioning

confidence: 99%

“…As a result, the component of F L (x, Q 2 ) induced by the charmed-strange current grows rapidly to small-x and dominates F L at Q 2 ∼ m 2 c [4,5].…”

Section: Introductionmentioning

confidence: 99%

Current non-conservation effects in νDIS diffraction

Fiore¹,

Zoller²

2009

AIP Conference Proceedings

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In the neutrino DIS diffraction the charged current non-conservation gives rise to sizable corrections to the longitudinal structure function, F L . These corrections is a higher twist effect enhanced at small-x by the rapidly growing gluon density. The phenomenon manifests itself in abundant production of charm and strangeness by longitudinally polarized W bosons of moderate virtualities Q 2 ∼ < m 2 c Keywords: neutrino deep inelastic scattering, small-x, color dipoles PACS: 13.15.+g 13.60.Hb and η(x) = C A log(x 0 /x).As for our numerical estimates (Fig. 1), we calculate nuclear and nucleon structure functions to the leading order in α S log (1/x) within the color dipole BFKL approach [18]. The full scale BFKL evolution of F L (x, Q 2 ) is shown in Fig. 2 of Ref.[19]. SUMMARYSummarizing, it is shown that at small x and moderate virtualities of the probe, Q 2 ∼ m 2 c , the higher twist corrections brought about by the non-conservation of the charmedstrange current dramatically change the longitudinal structure function, F L . The effect survives the limit Q 2 → 0 and seems to be interesting from a point of view of feasible tests of Adler's theorem [2] and the PCAC hypothesis.

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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 of small-x neutrino deep-inelastic scattering

Cited by 13 publications

References 27 publications

Heavy quark currents in ultra-high energy neutrino interactions

Heavy quark currents in ultra-high energy neutrino interactions

Current non-conservation effects in νDIS diffraction

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

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