Quasi two bodye + e ? annihilation

Krämer, G.; Walsh, Thomas

doi:10.1007/bf01391986

Cited by 35 publications

(13 citation statements)

References 18 publications

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“…The helicity formalism is the most convenient theoretical tool for performing this analysis. Denoting the basic helicity amplitude [11] for arbitrary H spin-J by…”

Section: Heavy Higgs Bosonsmentioning

confidence: 99%

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Identifying the Higgs spin and parity in decays to Z pairs

et al. 2003

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Higgs decays to Z boson pairs may be exploited to determine spin and parity of the Higgs boson, a method complementary to spin-parity measurements in Higgsstrahlung. For a Higgs mass above the on-shell ZZ decay threshold, a modelindependent analysis can be performed, but only by making use of additional angular correlation effects in gluon-gluon fusion at the LHC and γγ fusion at linear colliders. In the intermediate mass range, in which the Higgs boson decays into pairs of real and virtual Z bosons, threshold effects and angular correlations, parallel to Higgs-strahlung, may be adopted to determine spin and parity, though high event rates will be required for the analysis in practice.

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“…The helicity formalism is the most convenient theoretical tool for performing this analysis. Denoting the basic helicity amplitude [11] for arbitrary H spin-J by…”

Section: Heavy Higgs Bosonsmentioning

confidence: 99%

“…Spin ≥ 3: Above spin-2 the number of independent helicity amplitudes does not increase any more [11] and the most general spin-J tensor T µνβ 1 ...β J is a direct product of a tensor …”

Section: Spinmentioning

confidence: 99%

Identifying the Higgs spin and parity in decays to Z pairs

et al. 2003

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“…~'hs--~~,:Js v~s 3b/3s (7) with (8) We have normalized the LS-amplitudes such that the total cross section is given by the sums of squares of the LS-amplitudes.…”

Section: F 11mentioning

confidence: 99%

Comments on charmed baryon pair production in e+e−-annihilation

Körner

Kuroda

1977

Physics Letters B

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Abstract:We show that the symmetric quark model calculation of charmed baryon pair creation in e+e--annihilation has an incorrect threshold structure. The cC-pair creation model posessPs the correct s-wave threshold behaviour, if the cc-pair and diquark pair are created in orbital s-waves. We show that the two models become identical for a specific orbital configuration and discuss implications for the relative production rates of 1\:.~: ~c~: ~cf.; +EtZ-c: 2:.;"~ +

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“…On the other hand, we can also go to the same static limit in the most general expressions for the above transitions which can be obtained from (1) and (2) (16) . …”

Section: Is a Charmed Axial-vector 2'vfeson Already Found?mentioning

confidence: 99%

Is a Charmed Axial-Vector Meson Already Found?

Matsuda

1977

Progress of Theoretical Physics

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We calculate the production rate via e+e-annihilation for a charmed p-wave meson of J P = 1 +, on the basis of a non-relativistic quark model of charmed hadrons. Our results strongly suggest that the charmed axial-vector meson should be found copiously in association with a ground-state charmed meson.There is by now strong evidenceD~sl that the charmed s-wave mesons of JP = oand 1-have in fact been found in e+ e-annihilation. Evidence for charmed baryons has also been reported. 4 l, 5 l The observed masses are consistent with the scheme of charm spectroscopy.a), 7 ) The charmed pseudoscalar meson states n+ (o-) = (cd) and D 0 (0-) = (cu) are produced primarily in association with one or two systems of larger mass. The recoil-mass spectrum against n+ shows a pronounced peak at mass 2.012 Ge VI c 2 ,"l,sl whereas against D 0 it exhibits two sharp peaks at masses 2.005 Ge VI c 2 and 2.147 Ge VI c 2 • D. sl The single peak in the former and the lower (both in height and in mass) peak in the latter are respectively interpreted as due to the associated production of the charmed vector mesons n-* (1 -) and D 0 * (1-) _sl,g) De Rujula, Georgi and Glashow 8 l,!Ol have attributed the higher recoilmass peak against D 0 to the kinematical reflection of the D 0 * D 0 * production.With more accurate values 3 l for the masses involved and with the actual beam energy (ys=4.028±0.005GeV) it has subsequently been claimed 1 D that the effect of the kinematical reflection alone is not sufficient to explain the quite pronounced higher narrow peak. Hence, in a recent Letterw by Suzuki an alternative interpretation has been put forward that the higher recoil-mass peak may be due to the production of a charmed P-wave meson state D 0 ** (D 0 **)(JP = 1 +) in association with D 0 (D 0 ) . The mass of the charmed axial-vector meson D 0 ** (D 0 **) is estimated from the momentum spectrum of D 0 or D 0 to be 2.147 Ge VI c 2 • A crude estimate has been given for the relative abundance of the D 0 D 0 ** and D 0 D 0 * production cross sections from the A 1p7! and wprr couplings via SU( 4) symmetry.De Rujula et al. 10 l also estimated the expected magnitude of the D 0 D 0 ** cross section near its threshold. The mass of D 0 ** (D 0 **) was chosen on the basis of the atomic modeFl of charm spectroscopy. This gives a higher threshold well tl Permanent address. at

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Quasi two bodye + e ? annihilation

Cited by 35 publications

References 18 publications

Identifying the Higgs spin and parity in decays to Z pairs

Identifying the Higgs spin and parity in decays to Z pairs

Comments on charmed baryon pair production in e+e−-annihilation

Is a Charmed Axial-Vector Meson Already Found?

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