scholarly journals PION AND KAON PRODUCTION IN NUCLEON–NUCLEON COLLISIONS

2007 ◽  
Vol 22 (02n03) ◽  
pp. 582-586
Author(s):  
MARTA TICHORUK ◽  
ANTONI SZCZUREK
Keyword(s):  
Degrees Of Freedom ◽  
Inclusive Cross Section ◽  
Nucleon Nucleon ◽  
Distribution Functions ◽  
Parton Distribution Functions ◽  
Kaon Production ◽  
Factorization Approach ◽  
Proton Proton ◽  
Proton Collisions ◽  
Proton Proton Collisions

Inclusive cross section for pion production in proton - proton collisions are calculated based on unintegrated parton distribution functions (uPDFs). In addition to purely gluonic terms the present approach includes also quark degrees of freedom. Phenomenological fragmentation functions from the literature are used. The new mechanisms are responsible for π+ - π- asymmetry. In contrast to standard collinear approach, application of 2 → 1 kt - factorization approach can be extended towards much lower transverse momenta, both at mid and forward rapidity region. The results of the calculation are compared with SPS and RHIC data.

scholarly journals STRUCTURE FUNCTIONS

2009 ◽  
Vol 24 (06) ◽  
pp. 1069-1086 ◽  
Author(s):  
CRISTINEL DIACONU
Keyword(s):  
Cross Sections ◽  
Structure Functions ◽  
Distribution Functions ◽  
Final States ◽  
Parton Distribution Functions ◽  
Proton Antiproton ◽  
Proton Proton ◽  
Proton Collisions ◽  
Bjorken X ◽  
Proton Proton Collisions

Recent progress in the understanding of the nucleon is presented. The unpolarized structure functions are obtained with unprecedented precision from the combined H1 and ZEUS data and are used to extract proton parton distribution functions via NLO QCD fits. The obtained parametrization displays an improved precision, in particular at low Bjorken x, and leads to precise predictions of cross-sections for LHC phenomena. Recent data from proton–antiproton collisions at Tevatron indicate further precise constraints at large Bjorken x. The flavor content of the proton is further studied using final states with charm and beauty in DIS ep and [Formula: see text] collisions. Data from polarized DIS or proton–proton collisions are used to test the spin structure of the proton and to constrain the polarized parton distributions.

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 SQUARK AND GLUINO HADROPRODUCTION

2011 ◽  
Vol 26 (16) ◽  
pp. 2637-2664 ◽  
Author(s):  
WIM BEENAKKER ◽  
SILJA BRENSING ◽  
MICHAEL KRÄMER ◽  
ANNA KULESZA ◽  
ERIC LAENEN ◽  
...  
Keyword(s):  
Cross Sections ◽  
Distribution Functions ◽  
Parton Distribution Functions ◽  
Proton Proton ◽  
Proton Collisions ◽  
Numerical Predictions ◽  
Theoretical Status ◽  
Higher Order Corrections ◽  
The Impact ◽  
Proton Proton Collisions

We review the theoretical status of squark and gluino hadroproduction and provide numerical predictions for all squark and gluino pair-production processes at the Tevatron and at the LHC, with a particular emphasis on proton–proton collisions at 7 TeV. Our predictions include next-to-leading order supersymmetric QCD corrections and the resummation of soft gluon emission at next-to-leading-logarithmic accuracy. We discuss the impact of the higher-order corrections on total cross-sections, and provide an estimate of the theoretical uncertainty due to scale variation and the parton distribution functions.

scholarly journals Production of massless charm jets in pp collisions at next-to-leading order of QCD

2015 ◽  
Vol 30 (18n19) ◽  
pp. 1550111 ◽  
Author(s):  
Isabella Bierenbaum ◽  
Gustav Kramer
Keyword(s):  
Transverse Momentum ◽  
Parton Distribution ◽  
Distribution Functions ◽  
Inclusive Production ◽  
Leading Order ◽  
Parton Distribution Functions ◽  
Proton Proton ◽  
Proton Collisions ◽  
Intrinsic Charm ◽  
Proton Proton Collisions

We present predictions for the inclusive production of charm jets in proton–proton collisions at 7 TeV. Several CTEQ parton distribution functions (PDFs) of the CTEQ6.6M type are employed, where two of the CTEQ6.6 PDFs have intrinsic charm. At large enough jet transverse momentum and large jet rapidity, the intrinsic charm content can be tested.

scholarly journals Study of the Polarized Gluon Structure of a Proton via Prompt-Photon Production in the SPD Experiment at the NICA Collider

2019 ◽  
Vol 64 (7) ◽  
pp. 631 ◽  
Author(s):  
A. Rymbekova
Keyword(s):  
Parton Distribution ◽  
Distribution Functions ◽  
Prompt Photon ◽  
Hard Scattering ◽  
Parton Distribution Functions ◽  
Proton Proton ◽  
Proton Collisions ◽  
Polarized Proton ◽  
Proton Proton Collisions ◽  
Nica Collider

Photons produced in the hard scattering of partons, named prompt photons, provide information about the internal structure of hadrons. The NICA collider has the possibility to provide new data to study the production of prompt photons in non-polarized and polarized proton-proton collisions, which gives an access to spin-dependent parton distribution functions for gluons. Unpolarized and polarized physics with prompt photons and capabilities of the SPD detector in such measurements is discussed.

scholarly journals ANALYZING POWERS IN INCLUSIVE PION PRODUCTION AT HIGH ENERGY AND THE NUCLEON SPIN STRUCTURE

1999 ◽  
Vol 14 (21) ◽  
pp. 1403-1412 ◽  
Author(s):  
K. SUZUKI ◽  
N. NAKAJIMA ◽  
H. TOKI ◽  
K.-I. KUBO
Keyword(s):  
Pion Production ◽  
Spin Asymmetry ◽  
High Energy ◽  
Distribution Functions ◽  
Proton Proton ◽  
Model Calculations ◽  
Proton Collisions ◽  
Analyzing Powers ◽  
Polarized Proton ◽  
Proton Proton Collisions

Analyzing powers in inclusive pion production in high energy transversely polarized proton–proton collisions are studied theoretically in the framework of the quark recombination model. Calculations by assuming the SU(6) spin-flavor symmetry for the nucleon structure disagree with the experiments. We solve this difficulty by taking into account the realistic spin distribution functions of the nucleon, which differs from the SU(6) expectation at large x, with a perturbative QCD constraint on the ratio of the unpolarized valence distributions, u/d→5 as x→ 1. We also discuss the kaon spin asymmetry and find AN(K+)=-AN(K0) in the polarized proton–proton collisions at large x F .

scholarly journals PRODUCTION OF D AND B MESONS AND THEIR SEMILEPTONIC DECAYS

2011 ◽  
Vol 26 (03n04) ◽  
pp. 549-551
Author(s):  
RAFAŁ MACIUŁA ◽  
ANTONI SZCZUREK ◽  
GABRIELA ŚLIPEK
Keyword(s):  
B Mesons ◽  
Semileptonic Decay ◽  
Good Description ◽  
Semileptonic Decays ◽  
Open Charm ◽  
Factorization Approach ◽  
Proton Proton ◽  
Proton Collisions ◽  
Charged Leptons ◽  
Proton Proton Collisions

We have calculated the kinematical correlations between charged leptons from semileptonic decays of open charm/bottom as well as leptons produced in the Drell-Yan mechanism in proton-proton collisions at BNL RHIC. Presented production rates for open charm and bottom were estimated by a detailed analysis of so-called nonphotonic electrons. The distributions for charm and bottom quarks pairs are calculated in the kt-factorization approach with the help of the Kwieciński unintegrated parton distributions. The hadronization of heavy quarks is done by means of Peterson et al. fragmentation function. The semileptonic decay functions are found by fitting recent semileptonic data obtained by the CLEO and BABAR. We get good description of recent PHENIX data.

Comparison of Proton Momentum Spectra in Proton-Proton Collisions Involving Pion and Kaon Production

1970 ◽  
Vol 25 (2) ◽  
pp. 126-129 ◽  
Author(s):  
M. A. Abolins ◽  
G. A. Smith ◽  
Z. Ming Ma ◽  
Eugene Gellert ◽  
A. B. Wicklund
Keyword(s):  
Proton Momentum ◽  
Kaon Production ◽  
Proton Proton ◽  
Proton Collisions ◽  
Momentum Spectra ◽  
Proton Proton Collisions
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