scholarly journals Event generator to construct cross sections for the multiphonon excitation of a set of collective vibrational modes

2010 ◽  
Vol 81 (3) ◽  
Author(s):  
C. H. Dasso ◽  
E. G. Lanza ◽  
H. M. Sofia
Keyword(s):  
Cross Sections ◽  
Event Generator ◽  
Vibrational Modes ◽  
Collective Vibrational Modes

scholarly journals Dielectron Production in Proton–Proton Collisions at √s=7 TeV with ALICE

Proceedings ◽  
2019 ◽  
Vol 10 (1) ◽  
pp. 24
Author(s):  
Sebastian Scheid
Keyword(s):  
Cross Sections ◽  
Mass Range ◽  
Heavy Ion ◽  
Event Generator ◽  
Leading Order ◽  
Proton Proton ◽  
Total Cross Sections ◽  
Proton Collisions ◽  
Ion Collisions ◽  
Proton Proton Collisions

The ALICE Collaboration measured dielectron production as a function of the invariant mass ( m ee ), the pair transverse momentum ( p T , ee ) and the pair distance of closest approach ( DCA ee ) in pp collisions at s = 7 TeV. Prompt and non-prompt dielectron sources can be separated with the DCA ee , which will give the opportunity in heavy-ion collisions to identify thermal radiation from the medium in the intermediate-mass range dominated by contributions from open-charm and beauty hadron decays. The charm and beauty total cross sections are extracted from the data by fitting the spectra with two different MC generators, i.e., PYTHIA a leading order event generator and POWHEG a next-to-leading order event generator. Significant model dependences are observed, reflecting the sensitivity of this measurement to the heavy-flavour production mechanisms.

Individual and collective vibrational modes of nanostructures studied by picosecond ultrasonics

Ultrasonics ◽  
2006 ◽  
Vol 44 ◽  
pp. e1289-e1294 ◽  
Author(s):  
T. Bienville ◽  
J.F. Robillard ◽  
L. Belliard ◽  
I. Roch-Jeune ◽  
A. Devos ◽  
...  
Keyword(s):  
Vibrational Modes ◽  
Collective Vibrational Modes ◽  
Picosecond Ultrasonics

scholarly journals Running axial mass of the nucleon as a phenomenological tool for calculating quasielastic neutrino–nucleus cross sections

2021 ◽  
Vol 81 (12) ◽  
Author(s):  
Igor D. Kakorin ◽  
Konstantin S. Kuzmin ◽  
Vadim A. Naumov
Keyword(s):  
Cross Sections ◽  
Axial Vector ◽  
Neutrino Energy ◽  
Neutrino Interaction ◽  
Charged Current ◽  
Event Generator ◽  
Wide Energy Range ◽  
Final State ◽  
Axial Mass ◽  
Wide Energy

AbstractWe suggest an empirical rule-of-thumb for calculating the cross sections of charged-current quasielastic (CCQE) and CCQE-like interactions of neutrinos and antineutrinos with nuclei. The approach is based on the standard relativistic Fermi-gas model and on the notion of neutrino energy dependent axial-vector mass of the nucleon, governed by a couple of adjustable parameters, one of which is the conventional charged-current axial-vector mass. The inelastic background contributions and final-state interactions are therewith simulated using GENIE 3 neutrino event generator. An extensive comparison of our calculations with earlier and current accelerator CCQE and CCQE-like data for different nuclear targets shows good or at least qualitative overall agreement over a wide energy range. We also discuss some problematical issues common to several competing contemporary models of the CCQE (anti)neutrino–nucleus scattering and to the current neutrino interaction generators.

scholarly journals Event Generators for Multi Hadronic Production in e+e− Collisions

2019 ◽  
Vol 218 ◽  
pp. 07005
Author(s):  
Rong-Gang Ping ◽  
Zhen Gao
Keyword(s):  
Cross Sections ◽  
Radiation Effects ◽  
Event Generator ◽  
Initial State ◽  
Order Accuracy ◽  
State Radiation ◽  
Hadronic Production ◽  
Event Generation ◽  
Exclusive Processes ◽  
Area Law

An event generator for multi hadron production is presented for measuring the R value in the τ-charm energy region with e+e− collisions. The initial state radiation effects are considered up to second order accuracy, and the radiative correction factor is calculated with hadronic Born cross sections. The established exclusive processes are generated according to their measured cross sections, while the missing processes are generated using the LUND Area Law model, and its parameters are tuned with data collected at $ \sqrt s $ = 3.08 GeV. The optimized values are validated with data in the range $ \sqrt s $= 2.2324 ∼ 3.671 GeV. These optimized parameters are universally valid for event generation below the DD¯threshold.

Prospects for Vibrational-Mode EELS with High Spatial Resolution

2014 ◽  
Vol 20 (3) ◽  
pp. 658-663 ◽  
Author(s):  
R.F. Egerton
Keyword(s):  
Energy Loss ◽  
Spatial Resolution ◽  
Cross Sections ◽  
High Spatial Resolution ◽  
Vibrational Mode ◽  
Oscillator Strengths ◽  
Vibrational Modes ◽  
Loss Peak ◽  
Scattering Process ◽  
Transmission Electron

AbstractTaking advantage of previous measurements by Geiger and co-workers, we discuss the possibilities and problems of measuring vibrational modes of energy loss in a transmission electron microscope fitted with a monochromator and a high-resolution energy-loss spectrometer. The tail of the zero-loss peak is seen to be a major limitation, rather than its full-width at half-maximum. Because of the low oscillator strengths and small cross-sections involved, radiation damage will limit the spatial resolution if this technique is applied to organic specimens. Delocalization of the inelastic scattering may also be a limitation, if a dipole description of the scattering process is valid.

Sign in / Sign up

Export Citation Format

Share Document