ω MESON PRODUCTION IN PROTON-PROTON COLLISIONS

2007 ◽  
Vol 22 (02n03) ◽  
pp. 621-624
Author(s):  
◽  
W. Ullrich ◽  
M. Abdel-Bary ◽  
K.-Th. Brinkmann ◽  
H. Clement ◽  
...  
Keyword(s):  
Meson Production ◽  
Excess Energy ◽  
Reaction Channel ◽  
Proton Proton ◽  
Proton Collisions ◽  
Polarized Beam ◽  
Polarization Observables ◽  
First Time ◽  
Proton Proton Collisions ◽  
Analyzing Power

One of the experimental programs at the TOF spectrometer located at the COSY-accelerator (Forschungszentrum Jülich, Germany) is the study of ω-meson production in proton proton collisions (pp → ppω). Recently, a measurement was performed with a polarized beam at an excess energy of ∊ = 129 MeV , which offers the possibility to analyze polarization observables of this reaction channel for the first time. The analyzing power (Ay) of the pp → ppω-reaction was determined to be compatible with zero.

scholarly journals Analyzing power Ay for ω meson production in proton–proton collisions

2008 ◽  
Vol 662 (1) ◽  
pp. 14-18 ◽  
Author(s):  
M. Abdel-Bary ◽  
K.-Th. Brinkmann ◽  
H. Clement ◽  
J. Dietrich ◽  
E. Doroshkevich ◽  
...  
Keyword(s):  
Meson Production ◽  
Proton Proton ◽  
Proton Collisions ◽  
Proton Proton Collisions ◽  
Analyzing Power

scholarly journals PRODUCTION OF η MESONS IN PROTON-PROTON COLLISIONS CLOSE TO THRESHOLD

2005 ◽  
Vol 20 (02n03) ◽  
pp. 708-711
Author(s):  
R. CZYŻYKIEWICZ ◽  
H.-H. ADAM ◽  
A. BUDZANOWSKI ◽  
D. GRZONKA ◽  
M. JANUSZ ◽  
...  
Keyword(s):  
Meson Production ◽  
Proton Proton ◽  
Proton Collisions ◽  
Polarized Beam ◽  
Proton Proton Collisions

A brief experimental overview on the close-to-threshold η meson production in proton-proton interactions is presented and the available observables in measurements with unpolarized and polarized beam and target are discussed.

η MESON PRODUCTION IN PROTON-PROTON COLLISIONS AT 40 AND 72 MeV EXCESS ENERGY

2011 ◽  
Vol 26 (03n04) ◽  
pp. 681-682
Author(s):  
◽  
HENRIK PETRÉN
Keyword(s):  
Angular Momentum ◽  
Simple Model ◽  
Cross Sections ◽  
Meson Production ◽  
Excess Energy ◽  
Proton Proton ◽  
Proton Collisions ◽  
Mass Distributions ◽  
Partial Waves ◽  
Proton Proton Collisions

Differential cross sections for η production in proton-proton collisions at 40 and 72 MeV above threshold show that higher partial waves are necessary to describe the reaction. A simple model assuming constant production amplitudes and including most partial waves up to two units of angular momentum reproduces the data rather well, and also describes the invariant mass distributions found at 15.5 MeV excess energy.

scholarly journals Near-threshold η meson production in proton–proton collisions

2000 ◽  
Vol 474 (1-2) ◽  
pp. 182-187 ◽  
Author(s):  
J. Smyrski ◽  
P. Wüstner ◽  
J.T. Balewski ◽  
A. Budzanowski ◽  
H. Dombrowski ◽  
...  
Keyword(s):  
Meson Production ◽  
Proton Proton ◽  
Proton Collisions ◽  
Proton Proton Collisions ◽  
Near Threshold

η-meson production in proton-proton collisions at excess energies of40and72MeV

2010 ◽  
Vol 82 (5) ◽  
Author(s):  
H. Petrén ◽  
Chr. Bargholtz ◽  
M. Bashkanov ◽  
D. Bogoslavsky ◽  
H. Calén ◽  
...  
Keyword(s):  
Meson Production ◽  
Proton Proton ◽  
Proton Collisions ◽  
Proton Proton Collisions

η PRODUCTION IN PROTON-PROTON COLLISIONS AT 72 MeV EXCESS ENERGY

2009 ◽  
Vol 24 (02n03) ◽  
pp. 446-449
Author(s):  
◽  
H. PETTERSSON ◽  
M. BASHKANOV ◽  
D. BOGOSLOWSKY ◽  
H. CALÉN ◽  
...  
Keyword(s):  
Simple Model ◽  
Strong Influence ◽  
Excess Energy ◽  
Exchange Model ◽  
Final States ◽  
Proton Proton ◽  
Proton Collisions ◽  
Boson Exchange ◽  
Proton Proton Collisions ◽  
Better Than

The production of η mesons at an excess energy of 72 MeV has been studied in the reaction pp → pp(η)γγ. It is shown that a simple model with Pp final states included reproduces observed differential distributions better than the same model restricted to Ss , Sd and Ds final states. The strong influence of the Pp states could be taken as an indication of ρ dominance within an one boson exchange model for the excitation of N *(1535).

scholarly journals THE MESON PRODUCTION IN PROTON–PROTON COLLISIONS IN NEXT-TO-LEADING ORDER AND INFRARED RENORMALONS

2011 ◽  
Vol 20 (05) ◽  
pp. 1243-1270 ◽  
Author(s):  
A. I. AHMADOV ◽  
R. M. BURJALIYEV
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Production Cross ◽  
Meson Production ◽  
Leading Order ◽  
Proton Proton ◽  
Proton Collisions ◽  
Running Coupling ◽  
Coupling Approach ◽  
Proton Proton Collisions

In this paper, we investigate the next-to-leading order contribution of the higher-twist Feynman diagrams to the large-pT inclusive pion production cross-section in proton–proton collisions and present the general formulae for the higher-twist differential cross-sections in the case of the running coupling and frozen coupling approaches. We compared the resummed next-to-leading order 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 its resummed expression (the Borel sum) are found. It is shown that the resummed result depends on the choice of the meson wave functions used in the calculations. We discuss the phenomenological consequences of possible higher-twist contributions to the meson production in proton–proton collisions in next-to-leading order at RHIC.

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