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Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
The production of charged particles in pp collisions at .sqrt.s = 63 GeV with an identified high p/sub T/ trigger particle emitted in the central region is studied. The measurements were performed at the CERN ISR using the Axial Field Spectrometer. The dependence of the ratio between positively and negatively charged particles on the identity, the transverse momentum and the rapidity of the trigger particle is investigated both in the system recoiling from the trigger particle and at small angles with respect to the trigger particle. The recoil system opposite to a positively charged trigger particle is nearly neutral, but shows a positive excess for negatively charged trigger particles. On the trigger side a charge compensating effect is seen, strongest for negatively charged trigger particles.
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
The production of charged particles in pp collisions at .sqrt.s = 63 GeV with an identified high p/sub T/ trigger particle emitted in the central region is studied. The measurements were performed at the CERN ISR using the Axial Field Spectrometer. The dependence of the ratio between positively and negatively charged particles on the identity, the transverse momentum and the rapidity of the trigger particle is investigated both in the system recoiling from the trigger particle and at small angles with respect to the trigger particle. The recoil system opposite to a positively charged trigger particle is nearly neutral, but shows a positive excess for negatively charged trigger particles. On the trigger side a charge compensating effect is seen, strongest for negatively charged trigger particles.
Author: G. Altarelli Publisher: World Scientific ISBN: 9789971505622 Category : Science Languages : en Pages : 420
Book Description
This volume reviews the physics studied at the CERN proton-antiproton collider during its first phase of operation, from the first physics run in 1981 to the last one at the end of 1985.The volume consists of a series of review articles written by physicists who are actively involved with the collider research program. The first article describes the proton-antiproton collider facility itself, including the antiproton source and its principle of operation based on stochastic cooling.The subsequent six articles deal with the various physics subjects studied at the collider. Each article describes in detail the experimental results on a particular subject, and also provides the theoretical framework necessary for their interpretation. Finally the last two articles discuss the physics expectations from the improved collider (the so-called ACOL program, which has just started operation), and also from the next generation of ?supercolliders? which are being considered both in Europe and in the United States America.
Author: A. Ali Publisher: Springer Science & Business Media ISBN: 1461595401 Category : Science Languages : en Pages : 437
Book Description
Articles focus on the planned European proton-proton collider, and concentrate on physics issues, rather than the more technical concerns addressed in the three previous workshops. The use of energies much higher than those of the American Superconducting Super Collider is featured. Topics include reviews of current projects, hadron collisions, lep
Author: Publisher: ISBN: Category : Languages : en Pages : 15
Book Description
Results on two-particle [Delta][eta][Delta][Phi] correlations in inelastic p + p interactions at 20, 31, 40, 80, and 158 GeV/c are presented. The measurements were performed using the large acceptance NA61/SHINE hadron spectrometer at the CERN Super Proton Synchrotron. The data show structures which can be attributed mainly to effects of resonance decays, momentum conservation, and quantum statistics. Furthermore, the results are compared with the Epos and UrQMD models.
Author: Steven D Bass Publisher: World Scientific ISBN: 981447455X Category : Science Languages : en Pages : 212
Book Description
One of the main challenges in nuclear and particle physics in the last 20 years has been to understand how the proton's spin is built up from its quark and gluon constituents. Quark models generally predict that about 60% of the proton's spin should be carried by the spin of the quarks inside, whereas high energy scattering experiments have shown that the quark spin contribution is small — only about 30%. This result has been the underlying motivation for about 1000 theoretical papers and a global program of dedicated spin experiments at BNL, CERN, DESY and Jefferson Laboratory to map the individual quark and gluon angular momentum contributions to the proton's spin, which are now yielding exciting results. This book gives an overview of the present status of the field: what is new in the data and what can be expected in the next few years. The emphasis is on the main physical ideas and the interpretation of spin data. The interface between QCD spin physics and the famous axial U(1) problem of QCD (eta and etaprime meson physics) is also highlighted.
Author: Ulrich F. Katz Publisher: Springer ISBN: 354045019X Category : Science Languages : en Pages : 243
Book Description
About three decades after the first experiments on deep inelastic lepton hadron scattering began to investigate the structure of hadrons, the history of this fruitful field of particle physics continues in the broad spectrum of research performed at the electron and positron proton collider HERA at DESY, where the multipurpose detectors ZEUS and H1 access ep scattering at a center of mass energy of 300 GeV and explore as yet uncharted kinematic realms of deep inelastic scattering. After the first years of data taking at HERA, each of the experiments has collected a total of roughly 40 pb 1 of e+p data, yielding sensitivity to deep inelastic e+p interactions at high four momentum transfers, Q2, where typi cal cross sections drop into the subpicobarn regime. This kinematic domain is characterized by electroweak unification, manifesting itself most markedly in the neutral and charged current cross sections, which approach an equal order of magnitude as Q2 rises above the square of the W and Z masses. Consequently, HERA allows, for the first time, studies of both types of pro cesses simultaneously with the same initial state conditions and in the same detector, and thus we can investigate the interplay of electroweak and strong forces governing the respective cross sections.
Author: R. G. Roberts Publisher: Cambridge University Press ISBN: 9780521351591 Category : Science Languages : en Pages : 191
Book Description
This book describes our present knowledge of protons and neutrons. Experiments using high-energy electrons, muons, and neutrinos reveal that the proton is made up of point-like constituents, i.e. quarks. The strong forces that bind quarks together, gluons, are described in terms of the modern theory of quantum chromodynamics (QCD). Larger and newer particle accelerators provide an opportunity to see deeper into the proton and probe the interactions between quarks and gluons at shorter distances. An understanding of this detailed substructure and of the fundamental forces responsible is one of the keys to unraveling the physics of the structure of matter.
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Author: W. D. Shephard
Author: G. Altarelli
Author: A. Ali
Author: Matthew James Antonelli
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Author: Steven D Bass
Author: Ulrich F. Katz
Author: R. G. Roberts