Quarkonium Spectroscopy and New States from BaBar

Quarkonium Spectroscopy and New States from BaBar
Author:
Publisher:
Total Pages: 4
Release: 2007
Genre:
ISBN:

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We review results on charmonium and bottomonium spectroscopy by the BaBar experiment at the PEP-II ee− collider at SLAC. More space is reserved to the new results like the observation of hadronic non-B{bar B} [Upsilon](4S) decays and the investigation on the production and decay properties of the recently discovered charmonium-like states X(3872) and Y (4260). These results are preliminary, unless otherwise specified.

Quarkonium Spectroscopy And Search for New States at BaBar

Quarkonium Spectroscopy And Search for New States at BaBar
Author:
Publisher:
Total Pages: 3
Release: 2011
Genre:
ISBN:

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The BaBar experiment at the PEP-II B-factory gives excellent opportunities for the quarkonium spectroscopy. Investigation of the properties of new states like the X(3872), Y(3940) and Y(4260) are performed aiming to understand their nature. Recent BaBar results will be presented in this paper. At the B-factories charmonium and charmonium-like states are copiously produced via several mechanisms: in B decay (color suppressed b 2!c transition), double charmonium production (ee− 2!c{bar c} + c{bar c}), two photons production ([gamma]*[gamma]* 2!c{bar c}, where the c{bar c} state has positive C-parity) and in initial state radiation (ISR) when the e{sup {+-}} in its initial state emits a photon lowering the effective center of mass energy of the ee− interaction (e+e− 2![gamma]{sub ISR} + c{bar c}, where the charmonium state has the quantum numbers J{sup PC} = 1−2). Many new states have been recently discovered at the B-factories, BaBar and Belle, above the D{bar D} threshold in the charmonium energy region. While some of them appear to be consistent with conventional c{sub c} states others do not fit with any expectation. Several interpretations for these states have been proposed: for some of them the mass values suggest that they could be conventional charmonia, but also other interpretations like D°{bar D}*° molecule or diquark-antidiquark states among many other models have been advanced. Reviews can be found in Refs. [1][2]. In all cases the picture is not completely clear. This situation could be remedied by a coherent search of the decay pattern to D{bar D}, search for production in two-photon fusion and ISR, and of course improving the statistical precision upon the current measurements. The BaBar experiment at the PEP-II asymmetric collider, designed to perform precision measurement of CP violation in the B meson system, has an extensive quarkonium spectroscopy program. Recent BaBar outcomes on the X(3872) and Y(4260) and a new result on the Y(3940) are reported here.

Quarkonium Spectroscopy at BaBar

Quarkonium Spectroscopy at BaBar
Author: M. Negrini
Publisher:
Total Pages: 5
Release: 2006
Genre:
ISBN:

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The Babar experiment at the high luminosity storage ring PEP-II offers excellent opportunities in quarkonium spectroscopy. Recent Babar results obtained in this field are reported.

Quarkonium and Charm Hadrons

Quarkonium and Charm Hadrons
Author: S. J. Gowdy
Publisher:
Total Pages: 5
Release: 2006
Genre:
ISBN:

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We report on recent results in spectroscopy from BABAR. This includes the discovery of a new {Lambda}{sub c} baryon, detailed studies of the D*{sub sJ}(2317){sup +}, D{sub sJ}(2460){sup +}, X(3872) and Y(4260) particles and the first measurement of hadronic non-B{bar B} decays of the {Upsilon}(4S) meson.

Deep Inelastic Scattering

Deep Inelastic Scattering
Author: Masahiro Kuze
Publisher: World Scientific
Total Pages: 996
Release: 2007
Genre: Science
ISBN: 9812706704

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These proceedings present the most up-to-date status of deep inelastic scattering (DIS) physics. Topics such as structure function measurements and phenomenology, quantum chromodynamics (QCD) studies in DIS and photoproduction, spin physics and diffractive interactions are reviewed in detail, with emphasis on those studies that push the test of QCD and the Standard Model to the limits of their present range of validity, towards both the very high and the very low four-momentum transfers in leptonproton scattering.

New Spectroscopy at BaBar

New Spectroscopy at BaBar
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Total Pages: 5
Release: 2007
Genre:
ISBN:

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The Babar experiment at the SLAC B factory has accumulated a high luminosity that offers the possibility of systematic studies of quarkonium spectroscopy and of investigating rare new phenomena. Recent results in this field are presented. In recent times spectroscopy has become exciting again, after the discovery of new states that are not easily explained by conventional models. States such as the X(3872) and the Y(4260) could be new excited charmonium states, but require precise measurements for positive identification. The BaBar experiment [1] is installed at the asymmetric storage ring PEP-II. 90% of the data accumulated by BaBar are taken at the Y(4S) (10.58 GeV) and 10% just below (10.54 GeV). The BaBar detector includes a 5-layer, double-sided silicon vertex tracker and a 40-layer drift chamber in a 1.5 T solenoidal magnetic field, which detect charged particles and measures their momenta and ionization energy losses. Photons, electrons, and neutral hadrons are detected with a CsI(Tl)-crystal electromagnetic calorimeter. An internally reflecting ring-imaging Cherenkov is also used for particle id. Penetrating muon and neutral hadrons are identified by an array of resistive-plate chambers embedded in the steel of the flux return. The detector allows good track and vertex resolution, good particle id and good photon detection so it is especially suited for spectroscopy studies.

Spectroscopy and New Particles in BaBar

Spectroscopy and New Particles in BaBar
Author: B.Aa Petersen
Publisher:
Total Pages: 4
Release: 2005
Genre:
ISBN:

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Results on charmonium states and searches for pentaquark states at the BABAR experiment are presented.

Fundamental Interactions - Proceedings Of The 21st Lake Louise Winter Institute

Fundamental Interactions - Proceedings Of The 21st Lake Louise Winter Institute
Author: Alan Astbury
Publisher: World Scientific
Total Pages: 397
Release: 2006-12-29
Genre: Science
ISBN: 9814476633

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This proceedings volume contains the latest developments in particle physics in collider experiments. The contributions cover new results such as the production of quark-gluon plasma in the heavy-ion collider, the new techniques for precision measurement at low energies, and the status of neutrino physics at various laboratories including the new facilities that are at the planning stage.

Quarkonium States at B-Factories

Quarkonium States at B-Factories
Author:
Publisher:
Total Pages: 8
Release: 2011
Genre:
ISBN:

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An overview is given on recent progress in the study of quarkonium spectroscopy at the B-factories. In particular, an updated status report is presented of the long list of 'charmonium-like' resonances newly discovered, whose assignment as true charmonium states is in most cases at least controversial. Also, new measurements on the decay properties of bottomonium states above open-B production thresholds are shown. Much of the progress attained in recent years in the study of the quarkonium spectra is owed to the measurements performed at B-factories. The impressive amount of data recorded by the BABAR and Belle experiments has made it possible to study rare decay chains and to look for as yet undiscovered resonances in the charmonium and bottomonium mass regions. Results presented here are based on different subsamples of the full datasets recorded up to now by the two experiments, corresponding to integrated luminosities of about 430 fb−1(BABAR - final) and about 850 fb−1(Belle). Significant contributions also come from the analysis of the various data samples recorded by the CLEO detector.

Fundamental Interactions

Fundamental Interactions
Author: A. Astbury
Publisher: World Scientific
Total Pages: 397
Release: 2006
Genre: Science
ISBN: 9812772545

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This proceedings volume contains the latest developments in particle physics in collider experiments. The contributions cover new results such as the production of quark-gluon plasma in the heavy-ion collider, the new techniques for precision measurement at low energies, and the status of neutrino physics at various laboratories including the new facilities that are at the planning stage. Sample Chapter(s). Chapter 1: Making Precision Measurements at Hadron Colliders: Two Lectures (1,408 KB). Contents: Making Precision Measurements at Hadron Colliders: Two Lectures (H J Frisch); Evidence for a QuarkOCoGluon Plasma at RHC (J Harris); Neutrino Physics: A Selective Overview (S Oser); Low-Energy Tests of the Standard Model (M Pospelov); Leptonic B Decays (M-C Chang); Cosmic Neutrinos Beyond the Standard Model (U Harbach); Proton Structure from HERA (K Nagano); New Phenomena Searches at CDF (A Soha); Electroweak Results at LEP2 (P Spagnolo); and other papers. Readership: Graduate students, academics and researchers in particle and nuclear physics."