scholarly journals LONG-RANGE RAPIDITY CORRELATIONS IN HEAVY-LIGHT ION COLLISIONS

2014 ◽  
Vol 25 ◽  
pp. 1460023 ◽  
Author(s):  
YURI V. KOVCHEGOV ◽  
DOUGLAS E. WERTEPNY
Keyword(s):  
Long Range ◽  
Cross Section ◽  
Production Cross Section ◽  
Production Cross ◽  
Azimuthal Angle ◽  
Heavy Ion ◽  
The Other ◽  
Color Glass ◽  
Ion Collisions ◽  
Gluon Production

We study two-particle long-range rapidity correlations arising in the early stages of heavy ion collisions in the saturation/Color Glass Condensate framework, assuming for simplicity that one colliding nucleus is much larger than the other. We calculate the two-gluon production cross section while including all-order saturation effects in the heavy nucleus with the lowest-order rescattering in the lighter nucleus. We find four types of correlations in the two-gluon production cross section: (i) geometric correlations, (ii) HBT correlations accompanied by a back-to-back maximum, (iii) away-side correlations, and (iv) near-side azimuthal correlations which are long-range in rapidity. The geometric correlations (i) are due to the fact that nucleons are correlated by simply being confined within the same nucleus and may lead to long-range rapidity correlations for the produced particles without strong azimuthal angle dependence. Somewhat surprisingly, long-range rapidity correlations (iii) and (iv) have exactly the same amplitudes along with azimuthal and rapidity shapes: one centered around Δϕ = π with the other one centered around Δϕ = 0 (here Δϕ is the azimuthal angle between the two produced gluons). We thus observe that the early-time CGC dynamics in nucleus-nucleus collisions generates azimuthal non-flow correlations which are qualitatively different from jet correlations by being long-range in rapidity. If strong enough, they have the potential of mimicking the elliptic (and higher-order even-harmonic) flow in the di-hadron correlators: one may need to take them into account in the experimental determination of the flow observables.

scholarly journals Measurement of Open Heavy-Flavour Production in pp and p–Pb Collisions with ALICE at the LHC

2018 ◽  
Vol 46 ◽  
pp. 1860019
Author(s):  
Renu Bala
Keyword(s):  
Cross Section ◽  
Production Cross Section ◽  
Heavy Ion Collisions ◽  
D Mesons ◽  
Production Cross ◽  
Hadron Collider ◽  
Heavy Ion ◽  
Nuclear Modification Factor ◽  
Ion Collisions ◽  
Modification Factor

The Large Hadron Collider at CERN allows us to study heavy-ion collisions at an un- precedented energy. ALICE, A Large Ion Collider Experiment, is the experiment ded- icated to the investigation of heavy-ion collisions. In this contribution, recent open heavy-flavour results from pp collisions at [Formula: see text]= 5.02, 7, 8 and 13 TeV and p–Pb collisions at [Formula: see text] = 5.02 TeV, collected with the ALICE detector during the LHC Run-1 and Run-2 are presented. The results include the production cross section, nuclear modification factor and multiplicity dependence studies of production of D mesons and electrons from heavy-flavour hadron decays at mid-rapidity and of muons from heavy-flavour hadron decays at forward rapidity. Charm production was measured down to [Formula: see text] = 0 GeV/[Formula: see text] in pp and p–Pb collisions. Recent measurements of the production cross section of heavy charmed baryons such as [Formula: see text] (in pp and p–Pb) and [Formula: see text] (in pp) are discussed. The results are compared with theoretical model predictions.

scholarly journals Production cross section of neutron-rich calcium isotopes in heavy ion collisions

2015 ◽  
Vol 39 (4) ◽  
pp. 044103 ◽  
Author(s):  
Dong-Hong Zhang ◽  
Wen-Jie Xie ◽  
Jun Su ◽  
Feng-Shou Zhang
Keyword(s):  
Cross Section ◽  
Production Cross Section ◽  
Heavy Ion Collisions ◽  
Production Cross ◽  
Heavy Ion ◽  
Calcium Isotopes ◽  
Ion Collisions

THE INTERACTION OF ρ AND K+ MESONS WITH MATTER

2010 ◽  
Vol 19 (08n10) ◽  
pp. 1609-1618
Author(s):  
J. AICHELIN ◽  
C. HARTNACK ◽  
Y. LEIFELS ◽  
H. OESCHLER ◽  
S. VOGEL
Keyword(s):  
Cross Section ◽  
Charge Exchange ◽  
Production Cross Section ◽  
Production Cross ◽  
Heavy Ion ◽  
Potential Interaction ◽  
Heavy Ion Experiments ◽  
Vector Mesons ◽  
Kaon Production ◽  
K Mesons

We review in this contribution the information we can obtain from heavy-ion experiments about the interaction of mesons with matter. We demonstrate that the vector mesons seen in experiments come predominantly from low densities. Kaons offer a better opportunity but most of the presently available experimental observables do not allow to analyze separately the three essential unknown quantities: the kaon production cross-section in the medium, the K+N potential interaction at finite densities and temperatures and the kaon (elastic or charge exchange) rescattering cross-section in the medium. We propose a measurement which almost exclusively tests the K+N potential.

scholarly journals Production of exotic charmonium in heavy ion collisions

2020 ◽  
Vol 235 ◽  
pp. 02005
Author(s):  
F. S. Navarra
Keyword(s):  
Gas Phase ◽  
Cross Section ◽  
Heavy Ion Collisions ◽  
Production Cross ◽  
Short Review ◽  
Heavy Ion ◽  
Charmonium Production ◽  
Ion Collisions ◽  
Hadron Gas ◽  
Multiquark States

We present a short review of exotic charmonium production in heavy ion collisions. We discuss predictions for the production cross section of several of these states in ultra-peripheral Pb-Pb collisions at the LHC. The experimental study of these processes is feasible and can be used to yield valuable information about the structure of multiquark states. We also address X(3872) production in central Pb-Pb collisions. In particular, we discuss the suppression of X(3872) during the hadron gas phase. Finally, we comment on the very recent CMS data on the X(3872) yield in Pb-Pb collisions. the very recent CMS data on the X(3872) yield in Pb-Pb collisions.

scholarly journals Higher-twist mechanism and inclusive gluon production in pion–proton collisions

2015 ◽  
Vol 30 (36) ◽  
pp. 1550217
Author(s):  
A. I. Ahmadov ◽  
C. Aydin ◽  
R. Myrzakulov ◽  
O. Uzun
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Production Cross Section ◽  
Production Cross ◽  
Feynman Diagrams ◽  
Proton Collisions ◽  
Running Coupling ◽  
Gluon Production ◽  
Coupling Approach ◽  
Holographic Qcd

We calculate the contribution of the higher-twist Feynman diagrams to the large-[Formula: see text] inclusive gluon production cross-section in [Formula: see text] collisions in case of the running coupling and frozen coupling approaches within perturbative and holographic QCD. The structure of infrared renormalon singularities of the higher-twist subprocess cross-section is obtained and the resummed higher-twist cross-sections (Borel sum) with the ones obtained in the framework of the frozen coupling approach and leading-twist cross-section are compared and analyzed.

Search for MSSM Higgs Decaying to Tau Pairs

2005 ◽  
Vol 20 (15) ◽  
pp. 3314-3316
Author(s):  
◽  
DONGWOOK JANG
Keyword(s):  
Higgs Boson ◽  
Cross Section ◽  
Production Cross Section ◽  
Production Cross ◽  
Branching Fraction ◽  
Higgs Production ◽  
The Other ◽  
Tau Leptons ◽  
Higgs Boson Decaying ◽  
Tau Pairs

We present the results of a search for a neutral MSSM Higgs boson decaying to a pair of tau leptons. The analyzed data sample corresponds to integrated luminosity of approximately 200 pb-1 of [Formula: see text] collisions at [Formula: see text]. It was collected by the CDF detector during Run 2 of the Fermilab Tevatron. We select tau pairs in which one of the taus decays hadronically and the other to e or μ and neutrinos. We see no evidence of signal and perform a fit to the (partially) reconstructed di-tau mass to set limits on the product of Higgs production cross-section and its branching fraction to taus.

Scaling of the L-vacancy-production cross section at kiloelectronvolt-ion collisions

2013 ◽  
Vol 39 (9) ◽  
pp. 791-794 ◽  
Author(s):  
P. Yu. Babenko ◽  
A. N. Zinoviev ◽  
A. P. Shergin
Keyword(s):  
Cross Section ◽  
Production Cross Section ◽  
Production Cross ◽  
Ion Collisions
Sign in / Sign up

Export Citation Format

Share Document