Nuclear Effects on R = sigma_L / sigma_T in Deep-Inelastic Scattering

Abstract

Cross section ratios for deep-inelastic scattering from 14N and 3He with respect to 2H have been measured by the HERMES experiment at DESY using a 27.5 GeV positron beam. The data cover a range in the Bjorken scaling variable x between 0.013 and 0.65, while the negative squared four-momentum transfer Q^2 varies from 0.5 to 15 GeV^2. The data are compared to measurements performed by NMC, E665, and SLAC on 4He and 12C, and are found to be different for x < 0.06 and Q^2 < 1.5 GeV^2. The observed difference is attributed to an A-dependence of the ratio R = sigma_L / sigma_T of longitudinal to transverse deep-inelastic scattering cross sections at low x and low Q^2.

9 pages of latex, 5 figures

References in corpus (10)

• The HERMES Spectrometer
• Measurement of the proton and the deuteron structure functions F2p and F2d
• A Re-Evaluation of the nuclear Structure Function Ratios for D, He, Li, C and Ca
• The Structure Function Ratios F2(Li)/F2(D) and F2(C)/F2(D) at small x
• Shadowing in Inelastic Scattering of Muons on Carbon, Calcium and Lead at Low XBj
• Measurements of R=sigma_L/sigma_T for 0.03<x<0.1 and Fit to World Data
• Accurate Measurement of F2d/F2p and Rd-Rp
• The Ratio of Gluon Distributions in Sn and C
• Extracting the Strange Density from $x{F}_3$
• On the $A$ dependence of $R={\sigma }_L/{\sigma }_T$ and the $Q^2$ dependence of Shadowing

Cited by in corpus (44)

• Determination of nuclear parton distribution functions and their uncertainties at next-to-leading order
• Nuclear shadowing
• New measurements of the EMC effect in very light nuclei
• Leading twist nuclear shadowing phenomena in hard processes with nuclei
• Propagation of Muons and Taus at High Energies
• The Challenge of the EMC Effect: existing data and future directions
• Global analysis of nuclear parton distribution functions and their uncertainties at next-to-next-to-leading order
• Nuclear Shadowing and Coherence Length for Longitudinal and Transverse Photons
• Deep inelastic scattering from A=3 nuclei and the neutron structure function
• Structure functions for light nuclei
• Neutron Structure Function and A=3 Mirror Nuclei
• Nuclear Shadowing in Electro-Weak Interactions
• Nuclear Effects in the Deuteron and Constraints on the d/u Ratio
• Neutron structure function $F_2^n(x)$ from deep inelastic electron scattering off few-nucleon systems
• Tensor-polarized structure function $b_1$ in the standard convolution description of the deuteron
• Nuclear parton distribution functions with uncertainties in a general mass variable flavor number scheme
• Inclusive Measurements of Inelastic Electron and Positron Scattering from Unpolarized Hydrogen and Deuterium Targets
• Measurements of $d_2^n$ and $A_1^n$: Probing the neutron spin structure
• Measurement of the EMC effect in light and heavy nuclei
• Extraction of R = sigma_L/sigma_T from CCFR nu_mu-Fe and nubar_mu-Fe differential cross sections
• Measurements of the Separated Longitudinal Structure Function F_L from Hydrogen and Deuterium Targets at Low Q^2
• Study of W and Z Boson Production in Proton-Lead Collisions at the LHC with KP Nuclear Parton Distributions
• Pion-induced Drell-Yan processes and the flavor-dependent EMC effect
• Measurement of the Deuteron Structure Function F2 in the Resonance Region and Evaluation of Its Moments
• The pionic Drell-Yan process: a brief survey
• Application of the rescaling model at small Bjorken $x$ values
• Nuclear medium effects in structure functions of nucleon at moderate $Q^2$
• Impact of nuclear dependence of R=σ_L/σ_T on antishadowing in nuclear structure functions
• Nuclear enhanced power corrections to DIS structure functions
• Nuclear effects on the longitudinal structure function at small x
• Nuclear Parton Distributions
• Revealing Nuclear Pions Using Electron Scattering
• Nuclear modification of transverse-longitudinal structure function ratio
• New Measurements of the EMC Effect in Few-Body Nuclei
• Applications of a nonlinear evolution equation II: the EMC effect
• Effects of Longitudinal Photons
• The $g_{V\sigma \gamma }$-coupling constants in hadron electrodynamic
• EMC effect, few-nucleon systems and Poincaré covariance
• Deep Inelastic Scattering on an Extremal RN-AdS Black Hole II: Holographic Fermi Surface
• Nucleon correlations and Higher Twist effects in nuclear structure functions
• Ratio of Electron Scattering from Nuclei to Deuterium at low x and low Momentum Transfer
• Nuclear medium effects in lepton-nucleus DIS in the region of $x\gtrsim 1$
• Existence of nuclear modifications on longitudinal-transverse structure-function ratio
• Scalar meson production in nucleon-nucleon collisions near threshold