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Title: Hadron spectroscopy at babar

Authors:
;
Publication Date:
Research Org.:
COLLABORATION - SLAC
Sponsoring Org.:
USDOE
OSTI Identifier:
927337
Report Number(s):
LBNL-63139; SLAC-PUB-12514
DOE Contract Number:
DE-AC02-05CH11231
Resource Type:
Journal Article
Resource Relation:
Journal Name: European Physics Journal A; Journal Volume: 31; Related Information: Journal Publication Date: 2007
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Tosi, S., and BaBar Collaboration. Hadron spectroscopy at babar. United States: N. p., 2007. Web. doi:10.1140/epja/i2006-10174-9.
Tosi, S., & BaBar Collaboration. Hadron spectroscopy at babar. United States. doi:10.1140/epja/i2006-10174-9.
Tosi, S., and BaBar Collaboration. Thu . "Hadron spectroscopy at babar". United States. doi:10.1140/epja/i2006-10174-9.
@article{osti_927337,
title = {Hadron spectroscopy at babar},
author = {Tosi, S. and BaBar Collaboration},
abstractNote = {},
doi = {10.1140/epja/i2006-10174-9},
journal = {European Physics Journal A},
number = ,
volume = 31,
place = {United States},
year = {Thu Mar 01 00:00:00 EST 2007},
month = {Thu Mar 01 00:00:00 EST 2007}
}
  • The BABAR experiment at SLAC is designed to measure CP violation in the B meson system, however the very high statistics combined with the different e+ and e- beam energies, the detector design and the open trigger allow a wide variety of spectroscopic measurements. We are beginning to tap this potential via several production mechanisms. Here we present recent results from initial state radiation, hadronic jets, few body B and D hadron decays, and interactions in the detector material. We also summarize measurements relevant to Ds meson spectroscopy, pentaquarks and charmonium spectroscopy from multiple production mechanisms.
  • A comparative analysis of the experimental data on the total cross sections for hadron reactions as functions of the square of the total c.m. energy reveals a simple relationship between the energy positions of the peaks in the total elastic cross sections and the positions of the structure (peaks) in the total cross sections or the reactions 2..-->..n, n> or =3. Some consequences of this relationship are discussed. Generalizations for hadron spectroscopy and for a systematic classification of the masses of the nuclear ground states are discussed.
  • Tmore » he QCD light-front Hamiltonian equation H L F Ψ = M 2 Ψ derived from quantization at fixed LF time τ = t + z / c provides a causal, frame-independent method for computing hadron spectroscopy as well as dynamical observables such as structure functions, transverse momentum distributions, and distribution amplitudes. he QCD Lagrangian with zero quark mass has no explicit mass scale. de Alfaro, Fubini, and Furlan (dAFF) have made an important observation that a mass scale can appear in the equations of motion without affecting the conformal invariance of the action if one adds a term to the Hamiltonian proportional to the dilatation operator or the special conformal operator. If one applies the dAFF procedure to the QCD light-front Hamiltonian, it leads to a color-confining potential κ 4 ζ 2 for mesons, where ζ 2 is the LF radial variable conjugate to the q q ¯ invariant mass squared. he same result, including spin terms, is obtained using light-front holography, the duality between light-front dynamics and A d S 5 , if one modifies the A d S 5 action by the dilaton e κ 2 z 2 in the fifth dimension z . When one generalizes this procedure using superconformal algebra, the resulting light-front eigensolutions provide a unified Regge spectroscopy of meson, baryon, and tetraquarks, including remarkable supersymmetric relations between the masses of mesons and baryons and a universal Regge slope. he pion q q ¯ eigenstate has zero mass at m q = 0 . he superconformal relations also can be extended to heavy-light quark mesons and baryons. his approach also leads to insights into the physics underlying hadronization at the amplitude level. I will also discuss the remarkable features of the Poincaré invariant, causal vacuum defined by light-front quantization and its impact on the interpretation of the cosmological constant. AdS/QCD also predicts the analytic form of the nonperturbative running coupling α s ( Q 2 ) e - Q 2 / 4 κ 2 . he mass scale κ underlying hadron masses can be connected to the parameter Λ M S ¯ in the QCD running coupling by matching the nonperturbative dynamics to the perturbative QCD regime. he result is an effective coupling α s ( Q 2 ) defined at all momenta. One obtains empirically viable predictions for spacelike and timelike hadronic form factors, structure functions, distribution amplitudes, and transverse momentum distributions. Finally, I address the interesting question of whether the momentum sum rule is valid for nuclear structure functions.« less
  • New and recent results are presented on charm spectroscopy from BABAR experiment at SLAC. In particular, new estimates of [illegible] meson properties and the discovery of a new D{sub s}{sup +} meson at 2.856 GeV/c{sup 2} decaying to DK are addressed. These analyses have been performed using e{sup +}e{sup -} {yields} c{bar c} continuum events on a data sample corresponding to an integrated luminosity of about 240 fb{sup -1}.