Considerations on the cross section for pion production in proton-proton collisions

1959 ◽  
Vol 13 (6) ◽  
pp. 1285-1289 ◽  
Author(s):  
E. Ferrari
Keyword(s):  
Cross Section ◽  
Pion Production ◽  
Proton Proton ◽  
Proton Collisions ◽  
The Cross ◽  
Proton Proton Collisions

scholarly journals Measurement of the cross-section and charge asymmetry of W bosons produced in proton–proton collisions at $$\sqrt{s}=8~\text {TeV}$$ with the ATLAS detector

2019 ◽  
Vol 79 (9) ◽  
Author(s):  
G. Aad ◽  
◽  
B. Abbott ◽  
D. C. Abbott ◽  
O. Abdinov ◽  
...  
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Charge Asymmetry ◽  
Distribution Functions ◽  
Parton Distribution Functions ◽  
Proton Proton ◽  
Proton Collisions ◽  
The Cross ◽  
Proton Proton Collisions ◽  
Integrated Luminosity

Abstract This paper presents measurements of the $$W^+ \rightarrow \mu ^+\nu $$W+→μ+ν and $$W^- \rightarrow \mu ^-\nu $$W-→μ-ν cross-sections and the associated charge asymmetry as a function of the absolute pseudorapidity of the decay muon. The data were collected in proton–proton collisions at a centre-of-mass energy of 8 $$\text {TeV}$$TeV with the ATLAS experiment at the LHC and correspond to a total integrated luminosity of $$20.2~\text{ fb }^{-1}$$20.2fb-1. The precision of the cross-section measurements varies between 0.8 and 1.5% as a function of the pseudorapidity, excluding the 1.9% uncertainty on the integrated luminosity. The charge asymmetry is measured with an uncertainty between 0.002 and 0.003. The results are compared with predictions based on next-to-next-to-leading-order calculations with various parton distribution functions and have the sensitivity to discriminate between them.

scholarly journals First measurement of the cross section for top-quark pair production in proton–proton collisions at s=7 TeV

2011 ◽  
Vol 695 (5) ◽  
pp. 424-443 ◽  
Author(s):  
V. Khachatryan ◽  
A.M. Sirunyan ◽  
A. Tumasyan ◽  
W. Adam ◽  
T. Bergauer ◽  
...  
Keyword(s):  
Pair Production ◽  
Cross Section ◽  
Top Quark ◽  
Proton Proton ◽  
Proton Collisions ◽  
The Cross ◽  
Proton Proton Collisions

scholarly journals EXCITED HYPERONS PRODUCED IN PROTON-PROTON COLLISIONS WITH ANKE AT COSY

2009 ◽  
Vol 18 (02) ◽  
pp. 241-247 ◽  
Author(s):  
IZABELLA ZYCHOR
Keyword(s):  
Cross Section ◽  
Beam Momentum ◽  
Exotic State ◽  
Simultaneous Observation ◽  
Proton Proton ◽  
Proton Collisions ◽  
Decay Modes ◽  
The Cross ◽  
Hyperon Resonance ◽  
Proton Proton Collisions

Excited neutral hyperons Y0* produced in the pp → pK+Y0* reaction with a COSY beam momentum of 3.65 MeV/c have masses below 1540 MeV/c2. The ANKE spectrometer allows the simultaneous observation of different decay modes: Y0* → π0Σ0, π∓Σ±, π0Λ, K-p by measuring kaons and pions of either charge in coincidence with protons. We have found indications for a neutral excited hyperon resonance Y0* with a mass of M(Y0*) = (1480 ± 15) MeV / c 2 and a width of Γ(Y0*) = (60±15) MeV / c 2. The cross section for Y0* is of the order of few hundred nanobarns. It can be either a Σ0 or a Λ hyperon and on the basis of existing data no conclusion could be made whether it is a three–quark baryon or an exotic state. Missing- and invariant–mass techniques have been used to identify the Λ(1405) resonance decaying via Σ0π0. The cross section for Λ(1405) production is equal to (4.5 ± 0.9 stat ± 1.8 syst ) µb. The shape and position of the Λ(1405) distribution are similar to those found from other decay modes, so no support is given to the two-pole model.

scholarly journals MESON PRODUCTION IN PROTON–PROTON COLLISIONS IN THE NAIVE NONABELIANIZATION APPROXIMATION AND THE ROLE OF INFRARED RENORMALONS

2012 ◽  
Vol 21 (02) ◽  
pp. 1250014 ◽  
Author(s):  
A. I. AHMADOV ◽  
SH. M. NAGIYEV ◽  
E. A. DADASHOV
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Pion Production ◽  
Production Cross ◽  
Meson Production ◽  
Proton Proton ◽  
Proton Collisions ◽  
Running Coupling ◽  
Coupling Approach ◽  
Proton Proton Collisions

We calculate the "naive nonabelianization" (NNA) contributions of the higher-twist Feynman diagrams to the large-pT inclusive pion production cross-section in proton–proton collisions in the case of the running coupling and frozen coupling approaches. We compare the resummed "naive nonabelianization" higher-twist cross-sections with the ones obtained in the framework of the frozen coupling approach and leading-twist cross-section. The structure of infrared renormalon singularities of the higher-twist subprocess cross-section and it's resummed expression are found. We discuss the phenomenological consequences of possible higher-twist contributions to the pion production in proton–proton collisions in within NNA.

scholarly journals The cross-section for J/ψ production in proton-proton collisions at centre-of-mass energies between 23 and 63 GeV

1977 ◽  
Vol 68 (1) ◽  
pp. 101-104 ◽  
Author(s):  
J.H. Cobb ◽  
S. Iwata ◽  
R.B. Palmer ◽  
D.C. Rahm ◽  
I. Stumer ◽  
...  
Keyword(s):  
Cross Section ◽  
Centre Of Mass ◽  
Proton Proton ◽  
Proton Collisions ◽  
The Cross ◽  
Proton Proton Collisions
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