Measurement of the decay φ→μ+μ−.

Ачасов, М. Н.; Baru, S.E.; Bozhenok, A. V.; Bukin, D.A.; Burdin, S.; Dimova, T.; Dubrovin, M.; Gaponenko, I.; Голубев, В. Б.; Ivanchenko, V.N.; Иванов, П. Ю.; Korol, A. A.; Koshuba, S. V.; Perevedentsev, E. A.; Pyata, E.E.; Salnikov, A.; Serednyakov, S. I.; Shary, V.; Shatunov, Yu. M.; Sidorov, V.; Силагадзе, З. К.; Usov, Y.

doi:10.1016/s0370-2693(99)00502-x

Cited by 9 publications

(7 citation statements)

References 11 publications

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“…Both detectors studied the rare decay φ → µ + µ − . The result of SND is [24] Br(φ → µ + µ − ) = (33.0 ± 4.5 ± 3.2) · 10 −5 (26) The result of CMD-2 is [23] Br…”

Section: Other Rare φ Decaysmentioning

confidence: 99%

Rare Φ Decays and Exotic Hadrons

Serednyakov

2000

Int. J. Mod. Phys. A

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“…Both detectors studied the rare decay φ → µ + µ − . The result of SND is [24] Br(φ → µ + µ − ) = (33.0 ± 4.5 ± 3.2) · 10 −5 (26) The result of CMD-2 is [23] Br…”

Section: Other Rare φ Decaysmentioning

confidence: 99%

Rare Φ Decays and Exotic Hadrons

Serednyakov

2000

Int. J. Mod. Phys. A

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“…There are two leptonic decays: φ → e + e − and φ → µ + µ − . The µ-e universality implies for these decays that [17]). There are two PDG values for this decay branching ratio [5].…”

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confidence: 99%

“…One of them B(φ → µ + µ − ) = (2.5±0.4)·10 −4 is based on the experiments on photoproduction of φ meson [11,12]. Another value of the branching ratio [13,14,17]. In addition the CMD-2 experiment [15,16] has some preliminary results on this decay.…”

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confidence: 99%

“…Our previous study of the e + e − → µ + µ − cross section was done using the 1996 data sample with the total integrated luminosity of 2.6 pb −1 [17]. In 1998 two experimental runs were carried out in the center of mass energy range E = 984 − 1060 MeV in 16 energy points.…”

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confidence: 99%

“…For example, the contribution from the process e + e − → π + π − is about 0.2% in the φ-meson peak. The cosmic ray background was suppressed by restriction of the time τ measured by outer scintillation counters with respect to the beam collision moment [17]: | τ |< 10 ns. About 30% of events selected by the cuts described above are still cosmic ray background.…”

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confidence: 99%

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Direct Measurement of theφ(1020)Leptonic Branching Ratio

et al. 2001

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The process e(+)e(-)-->mu(+)mu(-) has been studied by the SND detector at the VEPP-2M e(+)e(-) collider in the phi(1020)-resonance energy region. The measured effective phi meson leptonic branching ratio B(phi-->l(+)l(-)) identical with square root of B(phi-->e(+)e(-))B(phi-->mu(+)mu(-))] = (2.89 +/- 0.10 +/- 0.06) x 10(-4) agrees well with the Particle Data Group value B(phi-->e(+)e(-)) = (2.91 +/- 0.07) x 10(-4), confirming mu-e universality. Without additional assumption of mu-e universality the branching ratio B(phi-->mu(+)mu(-)) = (2.87 +/- 0.20 +/- 0.14) x 10(-4) was obtained.

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Glueballs, hybrids, multiquarks

2007

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Glueballs, hybrids and multiquark states are predicted as bound states in models guided by quantum chromo dynamics (QCD), by QCD sum rules or QCD on a lattice. Estimates for the (scalar) glueball ground state are in the mass range from 1000 to 1800 MeV, followed by a tensor and a pseudoscalar glueball at higher mass. Experiments have reported evidence for an abundance of meson resonances with 0 −+ , 0 ++ and 2 ++ quantum numbers. In particular, the sector of scalar mesons is full of surprises starting from the elusive and mesons. The a 0 (980) and f 0 (980), discussed extensively in the literature, are reviewed with emphasis on their Janus-like appearance as KK molecules, tetraquark states or qq mesons. Most exciting is the possibility that the three mesons f 0 (1370), f 0 (1500), and f 0 (1710) might reflect the appearance of a scalar glueball in the world of quarkonia. However, the existence of f 0 (1370) is not beyond doubt and there is evidence that both f 0 (1500) and f 0 (1710) are flavour octet states, possibly in a tetraquark composition. We suggest a scheme in which the scalar glueball is dissolved into the wide background into which all scalar flavour-singlet mesons collapse.There is an abundance of meson resonances with the quantum numbers of the . Three states are reported below 1.5 GeV/c 2 whereas quark models expect only one, perhaps two. One of these states, (1440), was the prime glueball candidate for a long time. We show that (1440) is the first radial excitation of the meson.Hybrids may have exotic quantum numbers which are not accessible by qq mesons. There are several claims for J P C = 1 −+ exotics, some of them with properties as predicted from the flux tube model interpreting the quark-antiquark binding by a gluon string. The evidence for these states depends partly on the assumption that meson-meson interactions are dominated by s-channel resonances. Hybrids with non-exotic quantum numbers should appear as additional states. Light-quark mesons exhibit a spectrum of (squared) masses which are proportional to the sum of orbital angular momentum and radial quantum numbers. Two states do not fall under this classification. They are discussed as hybrid candidates.The concept of multiquark states has received revived interest due to new resonances in the spectrum of states with open and hidden charm. The new states are surprisingly narrow and their masses and their decay modes often do not agree with simple quark-model expectations.Lattice gauge theories have made strong claims that glueballs and hybrids should appear in the meson spectrum. However, the existence of a scalar glueball, at least with a reasonable width, is highly questionable. It is possible that hybrids will turn up in complex multibody final states even though so far, no convincing case has been made for them by experimental data. Lattice gauge theories fail to identify the nonet of scalar mesons. Thus, at the present status of approximations, lattice gauge theories seem not to provide a trustworthy guide into unknown territory ...

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Measurement of the decay φ→μ+μ−.

Cited by 9 publications

References 11 publications

Rare Φ Decays and Exotic Hadrons

Rare Φ Decays and Exotic Hadrons

Direct Measurement of theφ(1020)Leptonic Branching Ratio

Glueballs, hybrids, multiquarks

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