High energy approximations for the total Born cross section for pair production in a screened Coulomb field

1994 ◽  
Vol 49 (1) ◽  
pp. 428-441 ◽  
Author(s):  
Leonard C. Maximon
Keyword(s):  
Pair Production ◽  
Cross Section ◽  
Coulomb Field ◽  
High Energy ◽  
Born Cross Section

QCD JETS AT HERA I.: O(αs) RADIATIVE CORRECTIONS TO ELECTROWEAK CROSS SECTIONS AND JET RATES

1989 ◽  
Vol 04 (07) ◽  
pp. 1781-1825 ◽  
Author(s):  
JÜRGEN G. KÖRNER ◽  
ERWIN MIRKES ◽  
GERHARD A. SCHULER
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Neutral Current ◽  
High Energy ◽  
Coupling Constant ◽  
Bjorken Scaling ◽  
Born Cross Section ◽  
Wide Range ◽  
Lepton Polarization ◽  
Jet Cross Sections

We present the complete O(αs) corrections to the electroweak cross sections of both neutral current and charged current deep inelastic e±p scattering including lepton polarization effects. Changes in the cross section due to the inclusion of next-to-leading-log (NLL) effects are parametrized by K factors, which are defined as the ratio of the NLL O(αs) cross sections and the Born cross section. Using the standard redefinition scheme of the parton densities, we find that the K factors deviate substantially from unity for small values of the Bjorken-Scaling variable x. We also elaborate on problems that arise when defining jet cross sections in ep scattering and present numerical results for the O(αs) 3-jet and 2-jet rates. We observe that the Q2-dependence of the 3-jet rate is dominated by the running strong coupling constant αs(Q2) allowing for its determination over a wide range in Q2 at high energy ep colliders.

The absorption of high-energy photons in matter

1958 ◽  
Vol 244 (1237) ◽  
pp. 245-258 ◽  
Keyword(s):  
Pair Production ◽  
Cross Section ◽  
Cross Sections ◽  
Born Approximation ◽  
Liquid Scintillation ◽  
Scintillation Counter ◽  
High Energy ◽  
A Value ◽  
Peak Energy ◽  
Better Than

Total absorption cross-sections of hydrogen, carbon, copper, silver, lead and uranium have been measured for photons of mean energy 94 MeV. The method was to measure the transmission through an absorber of photons from the Oxford synchrotron, using a biased liquid scintillation counter to select photons of energy near the peak energy of the machine. The experimental data for hydrogen have been used to deduce a value for the cross-section for pair production in the field of the electron of 4.7 ± 0.4 millibarn. The relative cross-sections for the heavier elements have been determined to better than ± 0.2 %, and confirm the most recent calculations of the correction to the Born approximation in the theory of pair production.

scholarly journals From LO to NLO in the parton Reggeization approach

2018 ◽  
Vol 191 ◽  
pp. 04007 ◽  
Author(s):  
Maxim Nefedov ◽  
Vladimir Saleev
Keyword(s):  
Pair Production ◽  
Cross Section ◽  
Parton Model ◽  
High Energy ◽  
Effective Theory ◽  
Leading Order ◽  
Multi Scale ◽  
Recent Developments

We present recent developments of the parton Reggeization approach (PRA), which is based on high-energy factorization of hard processes in the multi-Regge kinematics and Lipatov’s effective theory of Reggeized gluons and Reggeized quarks. The scheme of calculations in the leading order (LO) of the PRA is discussed. We present important examples of LO PRA applications for cross section calculations of multi-scale hard processes, such as pair production of BB¯-mesons, pair production of photons, and pair production of jets. Also the problem of matching of NLO calculations in PRA with NLO results in the Collinear Parton Model is discussed.

ON PRODUCTION OF MAGNETIC MONOPOLES VIA γγ FUSION AT HIGH ENERGY pp COLLISIONS

2006 ◽  
Vol 21 (38) ◽  
pp. 2873-2880 ◽  
Author(s):  
YU. KUROCHKIN ◽  
I. SATSUNKEVICH ◽  
DZ. SHOUKAVY ◽  
N. RUSAKOVICH ◽  
YU. KULCHITSKY
Keyword(s):  
Pair Production ◽  
Cross Section ◽  
Production Cross Section ◽  
Production Cross ◽  
High Energy ◽  
Magnetic Monopoles ◽  
Pp Collisions ◽  
Pair Production Cross Section

We consider the production of magnetic monopoles via γγ fusion at high energy pp collisions. In the assumption that the monopole spin is equal 0, 1/2, 1, the monopole–antimonopole pair production cross-section by this mechanism at LHC energies is estimated and analyzed.

scholarly journals For a light stop, less is more when gluinos mediate

2016 ◽  
Vol 31 (09) ◽  
pp. 1650052 ◽  
Author(s):  
Benjamin Nachman
Keyword(s):  
Pair Production ◽  
Cross Section ◽  
Production Cross ◽  
Effective Cross Section ◽  
High Energy ◽  
New Physics ◽  
Text Search ◽  
Less Is More ◽  
Pair Production Cross Section ◽  
8 Tev

Compressed mass spectra are generally more difficult to identify than spectra with large splittings. In particular, gluino pair production with four high energy top or bottom quarks leaves a striking signature in a detector. However, if any of the mass splittings are compressed, the power of traditional techniques may deteriorate. Searches for direct stop/sbottom pair production can be recast as searches for gluinos in order to extend the sensitivitity. As a demonstration, we show that for [Formula: see text] and [Formula: see text], limits on the stop mass at 8 TeV can be extended by least 300 GeV for a 1.1 TeV gluino using a [Formula: see text] search. At 13 TeV, the effective cross-section for the gluino mediated process is twice the direct stop pair production cross-section, suggesting that direct stop searches could be sensitive to discover new physics earlier than expected.

COHERENT PAIR PRODUCTION IN CRYSTALS IN PRESENCE OF ACOUSTIC WAVES

2010 ◽  
Vol 25 (supp01) ◽  
pp. 47-54
Author(s):  
A. R. MKRTCHYAN ◽  
A. A. SAHARIAN ◽  
V. V. PARAZIAN
Keyword(s):  
Single Crystal ◽  
Pair Production ◽  
Cross Section ◽  
Acoustic Waves ◽  
High Energy ◽  
Deformation Field ◽  
Crystallographic Axis ◽  
Electron Positron ◽  
Coherent Pair ◽  
Electron Positron Pair

Coherent electron-positron pair production by high-energy photons is investigated in a periodically deformed single crystal with a complex base. The formula for the corresponding differential cross-section is derived for an arbitrary deformation field. The conditions are specified under which the influence of the deformation is considerable. The case is considered in detail when the photon enters into the crystal at small angles with respect to a crystallographic axis. The results of the numerical calculations are presented for SiO 2 single crystal in the case of the deformation field generated by the acoustic wave of the S type. It is shown that, in dependence of the parameters, the presence of deformation can either enhance or reduce the pair creation cross-section.

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