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Book Production of neutral pions in PB Au collisions at 158 AGeV c

Download or read book Production of neutral pions in PB Au collisions at 158 AGeV c written by Rachik Soualah and published by . This book was released on 2009 with total page 141 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Electron pair Production in 158 AGeV c Pb Au Collisions from CERES

Download or read book Electron pair Production in 158 AGeV c Pb Au Collisions from CERES written by Sergey Yurevich and published by . This book was released on 2006 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Charged Kaon Production in P p and D Au Collisions the Baseline Comparison Systems for Understanding Au Au Collisions at RHIC

Download or read book Charged Kaon Production in P p and D Au Collisions the Baseline Comparison Systems for Understanding Au Au Collisions at RHIC written by Camelia M. Mironov and published by . This book was released on 2005 with total page 90 pages. Available in PDF, EPUB and Kindle. Book excerpt: One of the primary challenges in modern nuclear physics is to understand the properties of hot nuclear matter. The expectation is that at sufficiently high energy densities, nuclear matter undergoes a phase transition where individual nucleons 'dissolve' and a plasma of freely moving quarks and gluons is formed. To accomplish this in the laboratory, normal nuclear matter is heated and compressed through collisions of heavy nuclei at relativistic energies. The Relativistic Heavy Ion Collider (RHIC) at Brookhaven National Laboratory is a dedicated particle accelerator, capable of colliding nuclear beams to energies up to 100 GeV per nucleon per beam. Particle species ranging from protons (A =1) to gold (A =197) are accelerated in this state-of-the-art facility and collide at selected intersection points. In this dissertation, a detailed transverse momentum (p T) analysis is made at central rapidities, using the STAR Time Projection Chamber (TPC). The data set is comprised of about 10 million d+Au and about 6 million p+p events at 200 GeV. Previously analyzed data from a 2002 Au+Au run are also used. This work concentrates on the study of identified charged kaons (K +, K - ), which are the lightest strange mesons and hence the particles that dominate strangeness production. Charged kaons are identified using a topological reconstruction method which has relatively large p T coverage. In this dissertation, we present p T and yield systematics. We find that the particle to anti-particle ratio is p T independent in all colliding systems studied, an indication that in the p T range studied, the pQCD regime is not reached yet. The ratios, close to unity, signal a rather net-baryon-free mid-rapidity region. The in central d+Au collisions is larger than in peripheral Au+Au collisions, which might hint at the presence of 'Cronin effect' in the dAu system as explained. We also obtain results on nuclear modification factors (R dA CP - central to peripheral ratio, R dA, R AA - geometrically scaled Au+Au(d+Au) to p+p ratios) which are presented for various mesons and baryons. In d+Au collisions, an enhancement compared to binary scaling of both R dA CP and R dA is observed, an experimental observation called 'Cronin effect'. This result is thought to be an initial-state effect. In contrast, the same ratio in central Au+Au collisions exhibits a suppression instead of an enhancement. This was understood in terms of a dense partonic medium which induces energy loss via gluon radiation by a high-energy parton traversing the medium, and leads, after fragmentation, to hadrons with lower . The meson-baryon differences, first observed in Au+Au R AA CP, also exist in d+Au collisions.

Book Systematic Study of Charged pion and Kaon Femtoscopy in Au Au Collisions at SNN

Download or read book Systematic Study of Charged pion and Kaon Femtoscopy in Au Au Collisions at SNN written by and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In this paper, we present a systematic study of charged pion and kaon interferometry in Au+Au collisions at √sNN=200 GeV. The kaon mean source radii are found to be larger than pion radii in the outward and longitudinal directions for the same transverse mass; this difference increases for more central collisions. The azimuthal-angle dependence of the radii was measured with respect to the second-order event plane and similar oscillations of the source radii were found for pions and kaons. Finally, hydrodynamic models qualitatively describe the similar oscillations of the mean source radii for pions and kaons, but they do not fully describe the transverse-mass dependence of the oscillations.

Book Systematic Study of Charged pion and Kaon Femtoscopy in Au Au Collisions at math mrow msqrt msub mi mi mi Mathvariant

Download or read book Systematic Study of Charged pion and Kaon Femtoscopy in Au Au Collisions at math mrow msqrt msub mi mi mi Mathvariant written by and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In this paper, we present a systematic study of charged pion and kaon interferometry in Au+Au collisions at √sNN=200 GeV. The kaon mean source radii are found to be larger than pion radii in the outward and longitudinal directions for the same transverse mass; this difference increases for more central collisions. The azimuthal-angle dependence of the radii was measured with respect to the second-order event plane and similar oscillations of the source radii were found for pions and kaons. Finally, hydrodynamic models qualitatively describe the similar oscillations of the mean source radii for pions and kaons, but they do not fully describe the transverse-mass dependence of the oscillations.

Book Kaon Production and Kaon to Pion Ratio in Au Au Collisions at s sub NN

Download or read book Kaon Production and Kaon to Pion Ratio in Au Au Collisions at s sub NN written by and published by . This book was released on 2002 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mid-rapidity transverse mass spectra and multiplicity densities of charged and neutral kaons are reported for Au+Au collisions at √s{sub NN}=130 GeV at RHIC. The spectra are exponential in transverse mass, with an inverse slope of about 280 MeV in central collisions. The multiplicity densities for these particles scale with the negative hadron pseudo-rapidity density. The charged kaon to pion ratios are K/?− = 0.161 ± 0.002(stat) ± 0.024(syst) and K−/?− = 0.146 ± 0.002(stat) ± 0.022(syst) for the most central collisions. The K+/?− ratio is lower than the same ratio observed at the SPS while the K−/?− is higher than the SPS result. Both ratios are enhanced by about 50% relative to p+p and {bar p}+p collision data at similar energies.

Book Systematic Study of Charged pion and Kaon Femtoscopy in Au Au Collisions at u221A sNN

Download or read book Systematic Study of Charged pion and Kaon Femtoscopy in Au Au Collisions at u221A sNN written by and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We present a systematic study of charged pion and kaon interferometry in Au+Au collisions at √sNN=200 GeV. The kaon mean source radii are found to be larger than pion radii in the outward and longitudinal directions for the same transverse mass; this difference increases for more central collisions. The azimuthal-angle dependence of the radii was measured with respect to the second-order event plane and similar oscillations of the source radii were found for pions and kaons. Hydrodynamic models qualitatively describe the similar oscillations of the mean source radii for pions and kaons, but they do not fully describe the transverse-mass dependence of the oscillations.

Book Study of 3 prong Hadronic tau Decays with Charged Kaons

Download or read book Study of 3 prong Hadronic tau Decays with Charged Kaons written by Ilya Kravchenko and published by . This book was released on 1999 with total page 338 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Study of Charged Particle Species Produced in Association with B0 B and Bs Mesons in Proton Anti proton Collisions at S 1 2

Download or read book Study of Charged Particle Species Produced in Association with B0 B and Bs Mesons in Proton Anti proton Collisions at S 1 2 written by Denys Usynin and published by . This book was released on 2005 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors study the yields of charged kaons, charged pions, and protons produced in association with B mesons produced in proton-antiproton collisions at center of mass energy 1960 GeV using 355 pb{sup -1} of data collected with the CDF detector at the Fermilab Tevatron. This is the first reported measurements of these yields at a hadron collider. The B mesons are reconstructed using their semileptonic decays: B{sup 0} {yields} {ell}{sup +}D{sup -}X, D{sup -} {yields} K{sup +}{pi}{sup -}{pi}{sup -}; B{sup 0} {yields} {ell}{sup +}D*{sup -}X, D*{sup -} {yields} {pi}{sup -}{bar D}{sup 0}, {bar D}{sup 0} {yields} K{sup +}{pi}{sup -}; B{sup +} {yields} {ell}{sup +}{bar D}{sup 0}X, {bar D}{sup 0} {yields} K{sup +}{pi}{sup -}; B{sub s}{yields}{ell}{sup +}D{sub s}{sup -}X, D{sub s}{sup -} {yields} {pi}{sup -}{phi}, {phi} {yields} K{sup +}K{sup -}. The K, {pi}, and p are identified using the Time of Flight detector (TOF), the CDF spectrometer, and the specific ionization (dE/dx) measured in the central drift chamber (COT). The fraction of charged kaons produced in association with {bar B}{sub s}{sup 0} mesons is found to be larger than the fraction produced in association with the {bar B}{sup 0} and B{sup -} mesons, as expected from naive models of heavy quark hadronization to mesons. The particle species yields are found to be in qualitative agreement with simulation of B meson production in hadron collisions from the PYTHIA Monte Carlo, although the yield of kaons around {bar B}{sub s}{sup 0} mesons is found to be larger in the simulation when compared to the data. These studies are important for understanding methods of identifying the flavor of {bar B}{sub s}{sup 0} mesons in measurement of {bar B}{sub s}{sup 0} flavor oscillations and charge conjugation-parity (CP) violation in {bar B}{sub s}{sup 0} meson decays.

Book A High precision Study of the Rare Decay of a Charged Kaon Into a Charged Pion and an Electron positron Pair

Download or read book A High precision Study of the Rare Decay of a Charged Kaon Into a Charged Pion and an Electron positron Pair written by Scott Walter Eilerts and published by . This book was released on 1998 with total page 298 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Electrons and Kaons in Charmed Particle Decays Branching Ratio 3 9 to 7 4 GeV

Download or read book Electrons and Kaons in Charmed Particle Decays Branching Ratio 3 9 to 7 4 GeV written by and published by . This book was released on 1979 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Inclusive studies of the electron content, kaon content, and associated electron-kaon content of the decays of D mesons and other charmed particles produced in electron-positron annihilation are presented. At the psi(3772) resonance the following inclusive branching ratios for D meson decays to charged kaons were measured. Also at the psi(3772) resonance the average semileptonic branching ratio for D° and D decays to electrons has been measured to be .076 +- 028. The average semileptonic branching ratio of charmed particles produced in ee− annihilation at center-of-mass energies from 3.9 to 7.4 GeV is found to be equal within errors to that of the D's. At all energies the electron momentum spectra are consistent with a combination of the decays D .-->. Ke nu and D .-->. K*e nu. 84 references.