Heavy quark currents in ultra-high energy neutrino interactions - INSPIRE

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Heavy quark currents in ultra-high energy neutrino interactions

R. Fiore
(
- Calabria U. and
- INFN, Cosenza
)
,
V.R. Zoller
(
- Moscow, ITEP
)

Jul, 2011

12 pages

Published in:

JETP Lett. 95 (2012) 55-60

e-Print:

1107.4456 [hep-ph]

DOI:

10.1134/S002136401202004X

View in:

ADS Abstract Service

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Abstract: (arXiv)

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.

Note:

13 pages, 2 figures, to be published in JETP Letters

neutrino nucleon: interaction
neutrino: UHE
neutrino: interaction
asymmetry: left-right
gluon: density
color: dipole
structure function
BFKL equation
neutrino: right-handed
neutrino: left-handed

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