Suppression of $\Upsilon(1S)$, $\Upsilon(2S)$ and $\Upsilon(3S)$ Production in PbPb Collisions at $\sqrt{s_{NN}}$

Suppression of $\Upsilon(1S)$, $\Upsilon(2S)$ and $\Upsilon(3S)$ Production in PbPb Collisions at $\sqrt{s_{NN}}$
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Total Pages:
Release: 2016
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ISBN:

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The production yields of Upsilon(1S), Upsilon(2S), and Upsilon(3S) quarkonium states are measured through their decays into muon pairs in the CMS detector, in PbPb and pp collisions at the centre-of-mass energy per nucleon pair of 2.76 TeV. The data correspond to integrated luminosities of 166 inverse microbarns and 5.4 inverse picobarns for PbPb and pp collisions, respectively. Differential production cross sections are reported as functions of Upsilon rapidity $y$ up to 2.4, and transverse momentum pt up to 20 GeV/c. A strong centrality-dependent suppression is observed in PbPb relative to pp collisions, by factors of up to ~2 and 8, for the Upsilon(1S) and Upsilon(2S) states, respectively. No significant dependence of this suppression is observed as a function of y or pt. The Upsilon(3S) state is not observed in PbPb collisions, which corresponds to a suppression for the centrality-integrated data by at least a factor of ~7 at a 95% confidence level. The observed suppression is in agreement with theoretical scenarios modeling the sequential melting of quarkonium states in a quark gluon plasma.

Indications of Suppression of Excited $\Upsilon$ States in PbPb Collisions at $\sqrt{S_{NN}}$

Indications of Suppression of Excited $\Upsilon$ States in PbPb Collisions at $\sqrt{S_{NN}}$
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Total Pages: 25
Release: 2011
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A comparison of the relative yields of Upsilon resonances in the mu(+) mu( - ) decay channel in PbPb and pp collisions at a centre-of-mass energy per nucleon pair of 2.76 TeV, is performed with data collected with the CMS detector at the LHC. Using muons of transverse momentum above 4 GeV/c and pseudorapidity below 2.4, the double ratio of the Upsilon(2S) and Upsilon(3S) excited states to the Upsilon(1S) ground state in PbPb and pp collisions, (Upsilon(2S+3S)/Upsilon(1S)[PbPb])/(Upsilon(2S+3S)/Upsilon(1S)[pp]), is found to be 0.31 - 0.15 + 0.19 (stat.) +/- 0.03 (syst.). The probability to obtain the measured value, or lower, if the true double ratio is unity, has been calculated to be less than 1%.

Elementary Particles - Accelerators and Colliders

Elementary Particles - Accelerators and Colliders
Author: Ugo Amaldi
Publisher: Springer
Total Pages: 0
Release: 2013-03-27
Genre: Science
ISBN: 9783642230523

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After a historical consideration of the types and evolution of accelerators the physics of particle beams is provided in detail. Topics dealt with comprise linear and nonlinear beam dynamics, collective phenomena in beams, and interactions of beams with the surroundings. The design and principles of synchrotrons, circular and linear colliders, and of linear accelerators are discussed next. Also technological aspects of accelerators (magnets, RF cavities, cryogenics, power supply, vacuum, beam instrumentation, injection and extraction) are reviewed, as well as accelerator operation (parameter control, beam feedback system, orbit correction, luminosity optimization). After introducing the largest accelerators and colliders of their times the application of accelerators and storage rings in industry, medicine, basic science, and energy research is discussed, including also synchrotron radiation sources and spallation sources. Finally, cosmic accelerators and an outlook for the future are given.

Smart Environments

Smart Environments
Author: Diane Cook
Publisher: John Wiley & Sons
Total Pages: 424
Release: 2004-10-28
Genre: Computers
ISBN: 0471686581

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Smart Environments contains contributions from leading researchers, describing techniques and issues related to developing and living in intelligent environments. Reflecting the multidisciplinary nature of the design of smart environments, the topics covered include the latest research in smart environment philosophical and computational architecture considerations, network protocols for smart environments, intelligent sensor networks and powerline control of devices, and action prediction and identification.

Physics and Probability

Physics and Probability
Author: W. T. Grandy, Jr
Publisher: Cambridge University Press
Total Pages: 296
Release: 2004-12-16
Genre: Science
ISBN: 9780521617109

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The pioneering work of Edwin T. Jaynes in the field of statistical physics, quantum optics, and probability theory has had a significant and lasting effect on the study of many physical problems, ranging from fundamental theoretical questions through to practical applications such as optical image restoration. Physics and Probability is a collection of papers in these areas by some of his many colleagues and former students, based largely on lectures given at a symposium celebrating Jaynes' contributions, on the occasion of his seventieth birthday and retirement as Wayman Crow Professor of Physics at Washington University. The collection contains several authoritative overviews of current research on maximum entropy and quantum optics, where Jaynes' work has been particularly influential, as well as reports on a number of related topics. In the concluding paper, Jaynes looks back over his career, and gives encouragement and sound advice to young scientists. All those engaged in research on any of the topics discussed in these papers will find this a useful and fascinating collection, and a fitting tribute to an outstanding and innovative scientist.

The Large Hadron Collider

The Large Hadron Collider
Author: Don Lincoln
Publisher: JHU Press
Total Pages: 238
Release: 2014-10
Genre: Science
ISBN: 1421413515

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Lincoln, a senior scientist at Fermi National Accelerator Laboratory and adjunct professor of physics at Notre Dame, gives readers an insider's view of the Hadron Collider from its conception, through its early discoveries and difficulties, to its greatest triumph, the discovery of the Higgs boson.

Island Shores, Distant Pasts

Island Shores, Distant Pasts
Author: Scott M. Fitzpatrick
Publisher: University Press of Florida
Total Pages: 246
Release: 2017-05-09
Genre: Social Science
ISBN: 0813063140

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"An excellent compilation of new methods and theories in Caribbean archaeology. . . . Not only materialize[s] the methodological advance in Caribbean archaeology, but also signif[ies] the strong theoretical progression that this discipline is experiencing."--Journal of Caribbean Archaeology "Look[s] beyond the field of archaeology to include new techniques from genetics, computer simulation, and physical anthropology. . . . Unquestionably moves our understanding of the settling of the Caribbean forward and provides several new provocative avenues for further exploration."--New West Indian Guide "Demonstrate[s] various methods that introduce new insights into the investigation of Caribbean prehistory, revealing the complexity of pre-Columbian cultures, peoples, and their movements. . . . [and] contributes to a totalizing view of the colonization process in the Caribbean."--Caribbean Quarterly "Can be considered as a real starting point for a biological approach of the pre-Columbian settlement of the Caribbean."-- Benoit Berard, Universite des Antilles For more than a century, archaeologists and anthropologists have searched for evidence of when and how peoples first settled the Caribbean islands. Research on this area is pivotal for understanding the migration of peoples in the New World and how small and large populations develop biologically and culturally through time. This unique collection synthesizes our archaeological and biological knowledge about the pre-Columbian settlement of the Caribbean and highlights the various techniques we can use to analyze human migration and settlement patterns throughout history. Newer and well-established techniques, like computer simulations of seafaring, radiocarbon dating, three-dimensional and traditional craniometrics, stable isotopes, and ancient and modern DNA analysis, show great promise for helping us better understand pre-Columbian Caribbean population expansions, while demonstrating the utility of integrating and comparing biological markers with the archaeological record. Surprisingly little attention has been paid to migrations, population movements, and island colonization in the Caribbean islands. This volume fills that void. Scott M. Fitzpatrick is professor of archaeology at the University of Oregon and founding coeditor of the Journal of Island and Coastal Archaeology. Ann H. Ross is professor of biological sciences at North Carolina State University. She is a contributor to Digging Deeper: Current Trends and Future Directions in Forensic Anthropology and Archaeology. A volume in the series Bioarchaeological Interpretations of the Human Past, edited by Clark Spencer Larsen

Hot and Dense Nuclear Matter

Hot and Dense Nuclear Matter
Author: Walter Greiner
Publisher: Springer Science & Business Media
Total Pages: 874
Release: 2012-12-06
Genre: Science
ISBN: 1461525160

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Ladies and Gentlemen, dear colleagues, Welcome in Bodrum to the NASion Hot and Dense Nuclear Matter! Welcome also to Mrs. Governor Dr. Lale AYTAMAN. We are very honored, that you, Governor of the Mugla-State, came here to greet us. We are particularly grateful to you that you offered help and assured us to do everything that we can enjoy two safe weeks in Bodrum, in this wonderful area of your country. I have chosen Bodrum as the place for our NASI because I like this historic region where many cultures meet (e. g. , Oriental and European (Greek, Roman) culture) and where you find numerous places which played a role in ancient science and in early Christianity- I mention Milet (Thales) and Ephesus (Apostle Paulus), both of which are close by. Our NASI will exhibit the most recent developments in high energy heavy ion physics. The meeting is both a school and a conference: A school, because there are very many advanced students, who frequently are themselves already top researchers, attending the lectures of distinguished scientists and leading researchers. It is also a conference because new material, new results of this exciting and wonderful field - our field - high energy heavy ion physics will be presented. It is the topic of hot and dense nuclear matter, which we are focusing on.