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Title: New Spectroscopy at BaBar

Abstract

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 idmore » and good photon detection so it is especially suited for spectroscopy studies.« less

Authors:
;
Publication Date:
Research Org.:
Stanford Linear Accelerator Center (SLAC)
Sponsoring Org.:
USDOE
OSTI Identifier:
902498
Report Number(s):
SLAC-PUB-12476
TRN: US200718%%70
DOE Contract Number:
AC02-76SF00515
Resource Type:
Conference
Resource Relation:
Journal Name: Nucl.Phys.Proc.Suppl.164:126-130,2007; Conference: Prepared for QCD 05: 12th International QCD Conference: 20 Years of the QCD-Montpellier Conference, Montpellier, France, 4-8 Jul 2005
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; CHARGED PARTICLES; CHARMONIUM; DETECTION; DRIFT CHAMBERS; ELECTRONS; ENERGY LOSSES; HADRONS; IONIZATION; LUMINOSITY; MAGNETIC FIELDS; MUONS; PHOTONS; QUANTUM CHROMODYNAMICS; QUARKONIUM; SILICON; SPECTROSCOPY; STANFORD LINEAR ACCELERATOR CENTER; STEELS; STORAGE RINGS; Experiment-HEP,HEPEX

Citation Formats

Mazzoni, M.A., and /INFN, Rome. New Spectroscopy at BaBar. United States: N. p., 2007. Web.
Mazzoni, M.A., & /INFN, Rome. New Spectroscopy at BaBar. United States.
Mazzoni, M.A., and /INFN, Rome. Wed . "New Spectroscopy at BaBar". United States. doi:. https://www.osti.gov/servlets/purl/902498.
@article{osti_902498,
title = {New Spectroscopy at BaBar},
author = {Mazzoni, M.A. and /INFN, Rome},
abstractNote = {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.},
doi = {},
journal = {Nucl.Phys.Proc.Suppl.164:126-130,2007},
number = ,
volume = ,
place = {United States},
year = {Wed Apr 18 00:00:00 EDT 2007},
month = {Wed Apr 18 00:00:00 EDT 2007}
}

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  • We review hadron spectroscopy at BABAR with emphasis on recent results from the studies of the X(3872) state, inclusive charmonia on recoil, double charmonium production, and the broad structure observed at around 4.26 GeV/c{sup 2}. These results are preliminary, unless otherwise specified.
  • Results on charmonium states and searches for pentaquark states at the BABAR experiment are presented.
  • Recent results on the search for pentaquarks and on charmonium spectroscopy at BABAR are reviewed. The latter includes the observation of the puzzling new state X(3872) {yields} J/{psi} {pi}{sup +} {pi}{sup -} in B decays, and the searches for X(3872) in two-body B decays and initial state radiation events.
  • 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.
  • This document presents the recent studies of Charmed hadrons at BABAR BELLE and CLEO. Here the author focuses on the recent developments on the study of D*{sub sJ}, observation of D{sup +} {yields} K{sup +} {pi}{sup 0}, D{sup 0} - {bar D}{sup 0} mixing in the doubly cabibbo-suppressed decays using D{sup 0} {yields} K{sup +}{pi}{sup +}{pi}{sup 0} and the measurement of the decay constants using the leptonic D decays.