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Regularities in electromagnetic *decay* *widths*

, 2006

"... We revisit Sakurai’s remark on the regularities of lepton-pair widths for mesons, extending the panorama to radiative X → γγ decays. The regularities persist, and somehow surprisingly some of them seem to relate with Fermi’s constant-or Z 0-. Back in 1978, Sakurai took the opportunity of a festscrif ..."

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We revisit Sakurai’s remark on the regularities of lepton-pair

*widths*for mesons, extending the panorama to radiative X → γγ*decays*. The regularities persist, and somehow surprisingly some of them seem to relate with Fermi’s constant-or Z 0-. Back in 1978, Sakurai took the opportunity of a###
Measurement of the Partial *Decay* *Width*

"... The partial decay width of the Z to bb quark pairs has been measured by the DELPHI detector at LEP using data taken with the upgraded microvertex detector installed in spring 1994. B-hadrons, containing b-quarks, were tagged by several methods using either tracks with large impact parameters to the ..."

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The partial

*decay**width*of the Z to bb quark pairs has been measured by the DELPHI detector at LEP using data taken with the upgraded microvertex detector installed in spring 1994. B-hadrons, containing b-quarks, were tagged by several methods using either tracks with large impact parameters###
Instanton contributions to the τ *decay* *widths*

, 1993

"... Contrary to some previous claims, we find a sizable instanton contribution to the finite energy sum rule used to extract the value of the strong coupling from the measured τ decay widths. It is of the same order of magnitude as standard nonperturbative corrections induced by vacuum quark and gluon c ..."

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Contrary to some previous claims, we find a sizable instanton contribution to the finite energy sum rule used to extract the value of the strong coupling from the measured τ

*decay**widths*. It is of the same order of magnitude as standard nonperturbative corrections induced by vacuum quark and gluon###
/ Hybrid Exotic Meson *Decay* *Width*

"... We present results of a decay width calculation for a hybrid exotic meson(h J PC 1) in the decay channel h πa 1. This calculation uses quenched lattice QCD and Lüscher’s finite box method. Operators for the h and πa 1 states are used in a correlation matrix which was expanded by varying the smearing ..."

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We present results of a

*decay**width*calculation for a hybrid exotic meson(h J PC 1) in the*decay*channel h πa 1. This calculation uses quenched lattice QCD and Lüscher’s finite box method. Operators for the h and πa 1 states are used in a correlation matrix which was expanded by varying###
Electroweak corrections to the toponium *decay* *width*

, 1994

"... We discuss one-loop electroweak corrections to the decay width of toponium. We calculate the energy-level shifts by expanding around the solution of the Bethe-Salpeter equation in the instantaneous approximation, in analogy with the positronium case. We show that first-order electroweak effects are ..."

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We discuss one-loop electroweak corrections to the

*decay**width*of toponium. We calculate the energy-level shifts by expanding around the solution of the Bethe-Salpeter equation in the instantaneous approximation, in analogy with the positronium case. We show that first-order electroweak effects###
*Decay* *widths* in the massive Schwinger model

, 1996

"... By a closer inspection of the massive Schwinger model within mass perturbation theory we find that, in addition to the n-boson bound states, a further type of hybrid bound states has to be included into the model. Further we explicitly compute the decay widths of the three-boson bound state and of t ..."

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By a closer inspection of the massive Schwinger model within mass perturbation theory we find that, in addition to the n-boson bound states, a further type of hybrid bound states has to be included into the model. Further we explicitly compute the

*decay**widths*of the three-boson bound state###
Pion *Decay* *Widths* of D mesons

, 2000

"... The pionic decay rates of the excited L = 0,1 D mesons are calculated with a Hamiltonian model within the framework of the covariant Blankenbecler-Sugar equation. The interaction between the light quark and charm antiquark is described by a linear scalar confining and a screened one-gluon exchange i ..."

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interaction. The

*decay**widths*of the D ∗ mesons obtain a contribution from the exchange current that is associated with the linear scalar confining interaction. If this contribution is taken into account along with the single quark approximation, the calculated*decay*rates of the charged D ∗ mesons###
at the LHC and Higgs Boson *Decay* *Widths*

, 1996

"... The total cross section for Higgs boson production via the dominant gluon fusion mechanism including NLO [two-loop] QCD corrections can be calculated numerically with the program HIGLU. The QCD corrections are included for arbitrary Higgs and quark masses and increase the cross section at the LHC by ..."

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by up to a factor of 2. The source code HIGLU provides the evaluation of the production of the Standard Model [SM] Higgs boson as well as the neutral Higgs bosons of the minimal supersymmetric extension [MSSM]. The program HDECAY determines the

*decay**widths*and branching ratios of the Higgs bosons###
Resonance trapping and saturation of *decay* *widths*

, 1998

"... Resonance trapping appears in open many-particle quantum systems at high level density when the coupling to the continuum of decay channels reaches a critical strength. Here a reorganization of the system takes place and a separation of different time scales appears. We investigate it under the infl ..."

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the influence of additional weakly coupled channels as well as by taking into account the real part of the coupling term between system and continuum. We observe a saturation of the mean

*width*of the trapped states. Also the*decay*rates saturate as a function of the coupling strength. The mechanism