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Relative Transverse Momentum Distributions Of Bottom Hadrons Produced In 196 Tev Proton Antiproton Collisions
Download Relative Transverse Momentum Distributions Of Bottom Hadrons Produced In 196 Tev Proton Antiproton Collisions full books in PDF, epub, and Kindle. Read online Relative Transverse Momentum Distributions Of Bottom Hadrons Produced In 196 Tev Proton Antiproton Collisions ebook anywhere anytime directly on your device. Fast Download speed and no annoying ads. We cannot guarantee that every ebooks is available!
Book Synopsis Relative Transverse Momentum Distributions of Bottom Hadrons Produced in 1.96 TeV Proton-antiproton Collisions by : Philippe Roy
Download or read book Relative Transverse Momentum Distributions of Bottom Hadrons Produced in 1.96 TeV Proton-antiproton Collisions written by Philippe Roy and published by . This book was released on 2008 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Relative Transverse Momentum Distributions of Bottom Hadrons Produced in 1.96 TeV Proton-antiproton Collisions by :
Download or read book Relative Transverse Momentum Distributions of Bottom Hadrons Produced in 1.96 TeV Proton-antiproton Collisions written by and published by . This book was released on 2008 with total page 109 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fragmentation is the process by which bare quarks dress themselves up as hadrons. Since we cannot get reliable calculations of this process using perturbative quantum chromodynamics, the fragmentation properties of quarks must be obtained empirically. We report on the signal extraction and relative transverse momentum p{sub T} spectrum determination that will lead to a high precision measurement of relative fragmentation fractions of b quarks into B hadrons, in 1.96 TeV p{bar p} collisions. Using 1.9 fb−1 of data taken with the CDF-II detector, we fully reconstruct 473 ± 42 B{sub s}° → D{sub s}−?, 15206 ± 203 B° → D−?+, 1483 ± 45 B° → D*−?+ and 4444 ± 297?{sub b}° →?{sub c}+?− candidate decays. In order to reduce systematic uncertainties, ratios of p{sub T} spectra are reported. We find that B{sub s} and B° mesons are produced with similar p{sub T} and?{sub b} baryons are produced with lower p{sub T} than B° mesons. Our results are consistent with previous CDF measurements suggesting a difference between fragmentation processes observed at lepton and hadron colliders.
Book Synopsis Transverse Momentum Distributions of Hadrons Produced in Au+Au Collisions at 130 GeV Measured by the PHENIX Experiment at RHIC BNL by : Jane Muriel Burward-Hoy
Download or read book Transverse Momentum Distributions of Hadrons Produced in Au+Au Collisions at 130 GeV Measured by the PHENIX Experiment at RHIC BNL written by Jane Muriel Burward-Hoy and published by . This book was released on 2001 with total page 470 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Study of High Transverse Momentum Electrons Produced in High Energy Proton-antiproton Collisions by : David Robinson
Download or read book A Study of High Transverse Momentum Electrons Produced in High Energy Proton-antiproton Collisions written by David Robinson and published by . This book was released on 1988 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The W Boson Transverse Momentum Spectrum in Proton-antiproton Collisions at Radical S by :
Download or read book The W Boson Transverse Momentum Spectrum in Proton-antiproton Collisions at Radical S written by and published by . This book was released on 1991 with total page 141 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Collider Detector at Fermilab (CDF) was used to measure the transverse momentum distribution of W boson produced in proton-antiproton collisions at the Tevatron collider. The W bosons were identified by the decay W 2!e[nu]. The results are in good agreement with a next-to-leading order calculation. The cross section for W production with P{sub T}> 50 GeV/c is 423 {plus minus} 58 (stat.) {plus minus} 108 (sys.) pb. 58 refs., 53 figs., 16 tabs.
Book Synopsis Transverse Momentum Distributions of Hadrons by :
Download or read book Transverse Momentum Distributions of Hadrons written by and published by . This book was released on 1990 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: The study of hadron production in heavy ion collisions is essential to the search for effects beyond independent nucleon-nucleon collisions, for example the predicted phase transition to quark matter. Hadron distributions are known over a large range of transverse momenta for p-p collisions, so a careful study of the differences can be made. The transverse momentum distributions of hadrons may provide global information about p-nucleus and nucleus-nucleus collisions, such as the degree of thermalization achieved, and perhaps provide evidence for collective expansion of the highly excited central region. Comparison of the p{sub t} and transverse mass, m{sub t}, distributions of different hadronic species are crucial to extract this kind of information. Hadronic p{sub t} spectra show effects of the collision dynamics, such as hard scattering processes, and possibly rescattering of partons as well as of the formed hadrons. Such modifications have been observed in p-nucleus collisions, and can be expected to be important in nucleus-nucleus reactions. The spectral shape changes arising in this manner cause a background in efforts to extract global information from hadronic p{sub t} spectra. Lastly, there is an excess of pions observed at low p{sub t} in p-A and A-A collisions. the origin of these soft pions is not yet well understood. The phenomenon represents a major difference between p-p and nuclear collisions. 31 refs., 8 figs.
Book Synopsis The W Boson Transverse Momentum Spectrum in Proton-antiproton Collisions at (square Root)s by : Brian L. Winer
Download or read book The W Boson Transverse Momentum Spectrum in Proton-antiproton Collisions at (square Root)s written by Brian L. Winer and published by . This book was released on 1991 with total page 290 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Study of High Transverse Momentum Electrons Produced in High Energy Proton-antiproton Collisions by : David Robinson
Download or read book A Study of High Transverse Momentum Electrons Produced in High Energy Proton-antiproton Collisions written by David Robinson and published by . This book was released on 1988 with total page 306 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Transverse-momentum and Pseudorapidity Distributions of Charged Hadrons in Pp Collisions at Sqrt(s) by :
Download or read book Transverse-momentum and Pseudorapidity Distributions of Charged Hadrons in Pp Collisions at Sqrt(s) written by and published by . This book was released on 2010 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: Charged-hadron transverse-momentum and pseudorapidity distributions in proton-proton collisions at √s = 7 TeV are measured with the inner tracking system of the CMS detector at the LHC. The charged-hadron yield is obtained by counting the number of reconstructed hits, hit-pairs, and fully reconstructed charged-particle tracks. The combination of the three methods gives a charged-particle multiplicity per unit of pseudorapidity dN{sub ch}/d[eta].
Book Synopsis Measurements of Bottom Anti-bottom Azimuthal Production Correlations in Proton - Anti-proton Collisions at S**1/2 by :
Download or read book Measurements of Bottom Anti-bottom Azimuthal Production Correlations in Proton - Anti-proton Collisions at S**1/2 written by and published by . This book was released on 2004 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors have measured the azimuthal angular correlation of b{bar b} production, using 86.5 pb−1 of data collected by Collider Detector at Fermilab (CDF) in p{bar p} collisions at √s = 1.8 TeV during 1994-1995. In high-energy p{bar p} collisions, such as at the Tevatron, b{bar b} production can be schematically categorized into three mechanisms. The leading-order (LO) process is ''flavor creation'', where both b and {bar b} quarks substantially participate in the hard scattering and result in a distinct back-to-back signal in final state. The ''flavor excitation'' and the ''gluon splitting'' processes, which appear at next-leading-order (NLO), are known to make a comparable contribution to total b{bar b} cross section, while providing very different opening angle distributions from the LO process. An azimuthal opening angle between bottom and anti-bottom, [Delta][phi], has been used for the correlation measurement to probe the interaction creating b{bar b} pairs. The [Delta][phi] distribution has been obtained from two different methods. one method measures the [Delta][phi] between bottom hadrons using events with two reconstructed secondary vertex tags. The other method uses b{bar b} → (J/[psi]X)(lX') events, where the charged lepton (l) is an electron (e) or a muon ([mu]), to measure [Delta][phi] between bottom quarks. The b{bar b} purity is determined as a function of [Delta][phi] by fitting the decay length of the J/[psi] and the impact parameter of the l. Both methods quantify the contribution from higher-order production mechanisms by the fraction of the b{bar b} pairs produced in the same azimuthal hemisphere, f{sub toward}. The measured f{sub toward} values are consistent with both parton shower Monte Carlo and NLO QCD predictions.
Book Synopsis Measurements of Bottom Anti-bottom Azimuthal Production Correlations in Proton - Anti-proton Collisions at S**ư by :
Download or read book Measurements of Bottom Anti-bottom Azimuthal Production Correlations in Proton - Anti-proton Collisions at S**ư written by and published by . This book was released on 2004 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors have measured the azimuthal angular correlation of b{bar b} production, using 86.5 pb−1 of data collected by Collider Detector at Fermilab (CDF) in p{bar p} collisions at √s = 1.8 TeV during 1994-1995. In high-energy p{bar p} collisions, such as at the Tevatron, b{bar b} production can be schematically categorized into three mechanisms. The leading-order (LO) process is ''flavor creation'', where both b and {bar b} quarks substantially participate in the hard scattering and result in a distinct back-to-back signal in final state. The ''flavor excitation'' and the ''gluon splitting'' processes, which appear at next-leading-order (NLO), are known to make a comparable contribution to total b{bar b} cross section, while providing very different opening angle distributions from the LO process. An azimuthal opening angle between bottom and anti-bottom,??, has been used for the correlation measurement to probe the interaction creating b{bar b} pairs. The?? distribution has been obtained from two different methods. one method measures the?? between bottom hadrons using events with two reconstructed secondary vertex tags. The other method uses b{bar b} → (J/?X)(lX') events, where the charged lepton (l) is an electron (e) or a muon , to measure?? between bottom quarks. The b{bar b} purity is determined as a function of?? by fitting the decay length of the J/? and the impact parameter of the l. Both methods quantify the contribution from higher-order production mechanisms by the fraction of the b{bar b} pairs produced in the same azimuthal hemisphere, f{sub toward}. The measured f{sub toward} values are consistent with both parton shower Monte Carlo and NLO QCD predictions.
Book Synopsis Ratios of Single Hadrons Produced at High Transverse Momentum in 400 GEV/C Proton-nucleon Collisions by : Henry Donald Glass
Download or read book Ratios of Single Hadrons Produced at High Transverse Momentum in 400 GEV/C Proton-nucleon Collisions written by Henry Donald Glass and published by . This book was released on 1985 with total page 334 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Production of Large Transverse Momentum Mesons and Lepton Pairs in Proton-antiproton Collisions by : G. Jaroszkiewicz
Download or read book Production of Large Transverse Momentum Mesons and Lepton Pairs in Proton-antiproton Collisions written by G. Jaroszkiewicz and published by . This book was released on 1974 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Pseudorapidity and Transverse-momentum Distributions of Charged Particles in Proton-proton Collisions at √s by : Jaroslav Adam
Download or read book Pseudorapidity and Transverse-momentum Distributions of Charged Particles in Proton-proton Collisions at √s written by Jaroslav Adam and published by . This book was released on 2015 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Production of Hadrons with Large Transverse Momentum at 200, 300, and 400 GeV. by :
Download or read book Production of Hadrons with Large Transverse Momentum at 200, 300, and 400 GeV. written by and published by . This book was released on 1974 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Atomic Number Dependence of Hadron Production at Large Transverse Momentum in 300 GeV Proton--nucleus Collisions by :
Download or read book Atomic Number Dependence of Hadron Production at Large Transverse Momentum in 300 GeV Proton--nucleus Collisions written by and published by . This book was released on with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In an experiment at the Fermi National Accelerator Laboratory we have compared the production of large transverse momentum hadrons from targets of W, Ti, and Be bombarded by 300 GeV protons. The hadron yields were measured at 90{sup o} in the proton-nucleon c.m. system with a magnetic spectrometer equipped with 2 Cerenkov counters and a hadron calorimeter. The production cross-sections have a dependence on the atomic number A that grows with P{sub perpendicular}, eventually leveling off proportional to A{sup1.1}.
Book Synopsis Probing Hadron Structure in Proton-nucleus Collisions by : David Zaslavsky
Download or read book Probing Hadron Structure in Proton-nucleus Collisions written by David Zaslavsky and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Understanding the behavior of large atomic nuclei (heavy ions) in high-energy collisions has been the focus of a concerted research effort over the past 10-15 years. Much of the latest progress in the field has centered around transverse momentum-dependent (or "unintegrated") parton distributions: in particular the prediction of the high-energy behavior of these distributions, in the form of the Balitsky-JIMWLK equations, and the development of the hybrid factorization framework, which connects the unintegrated parton distributions to predictions for experimentally measured cross sections. With the advent of high-energy proton-nucleus collisions at RHIC and the LHC, we are able to experimentally test these predictions for the first time. In this dissertation, I show two case studies of these predictions, to illustrate the use of the hybrid factorization at leading and next-to-leading order.First, as a simple example, I analyze the azimuthal angular correlation for a Drell-Yan process, the production of a lepton pair with an associated hadron. The correlation for back-to-back emission turns out to be determined by the low-momentum region of the unintegrated gluon distribution, and the correlation for parallel emission is determined by the high-momentum region. Accordingly, a proper prediction of the correlation at all angles requires a gluon distribution with physically realistic behavior at both high and low momenta. Furthermore, the properties of the central double peak that emerges in Drell-Yan production can provide some insight into the form of the gluon distribution.I'll then describe a numerical calculation of the cross section for inclusive hadron production, which incorporates all corrections up to next-to-leading order in the strong coupling. This calculation illustrates several obstacles presented by subleading terms, including the removal of divergences by renormalizing the integrated and unintegrated parton distributions. The results of the calculation are negative at high transverse momentum, which is surprising but may be mathematically reasonable, since the perturbative approximation to the cross section may break down under those kinematic conditions. However, it may be possible to make meaningful predictions for the nuclear modification ratio R_pA despite the negative cross section.Moving beyond next-to-leading order, it may be possible to cure the negativity of the inclusive hadron cross section by altering the formulas used. I'll show two possible methods of doing so: first, a straightforward resummation of selected higher-order terms corresponding to gluon loop diagrams is able to mitigate the negativity, though it requires some alterations of unclear theoretical origin. A more promising alternative seems to be use of exact kinematic definitions, incorporating terms which disappear in the infinite-energy limit; this constrains the kinematics to eliminate the region of phase space which most strongly contributes to the negativity. In this way, the calculation can be adapted to produce reasonable results at high transverse momentum.
