Evidence for a singly charged boson of mass 962 MeV and narrow width

Kienzle, W.; Maglić, B.; Levrat, B.; Lefebvres, F.; Freytag, D.; Blieden, H.R.

doi:10.1016/0031-9163(65)90932-7

Cited by 55 publications

(5 citation statements)

References 5 publications

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“…Neither the m"(940) nor the 6° 963 The original CERN missing mass experiment reported a mass and width of 962 ± 5 MeV and T < 5 MeV for an enhancement referred to as the 6 (48). We suggest that the 6° (963) observed in the present experiment is the neutral member of an isotopic multiplet of which the 6 is the singlycharged negative member.…”

Section: ±2contrasting

confidence: 60%

The non-strange neutral meson spectrum from [pi]⁻p-->M°n at 2.4 GeV/c

Jacobel

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Section: ±2contrasting

confidence: 60%

The non-strange neutral meson spectrum from [pi]⁻p-->M°n at 2.4 GeV/c

Jacobel

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“…21 (ii) 1=1 assignments 19 for the M(953) other than J PC = 1 + " look less likely: J PC = 1"~ suggests a dominant (unobserved) 7777 mode, while J PC = 0~" implies considerable structure in the 777777 Dalitz plot (unobserved 16 ) and suppression of the ratio 77777/^TTTT. (The two pions in 0"" -77777 must have a relative L of at least 2 and must be produced by at least an Ml transition, involving more centrifugal-barrier factors than the 777777 mode.)…”

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confidence: 99%

Ninth Meson withJPC=1++

Rosner

Colglazier

1971

Phys. Rev. Lett.

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Expected properties of the D' (the ninth meson with J pc =i ++ ) include (a) assignment to a weakly mixed SU(3) singlet, predicted by duality; (b) a mass of ~950 MeV, predicted by super convergence; (c) decay modes r}im and 7r + 7r"y; and (d) the possibility of a suppressed p signal in the ir + 7r~ spectrum of the 7r + 7r~y final state, despite the expectation that the pions are in a state with I=J~l. These features suggest that a recently reported meson near the mass with decay modes rjinr and 7r + 7r"y may be a candidate for this state.The quark model 1 has been remarkably successful in classifying the lowest mesons. All of the qq, L = 0 states and most of the qq, L = 1 states have been discovered. 2 Notable exceptions are the /= Y=0 states of J p = 1 + . While two with C= -1 (qq, ^J and two with C = + 1 (qq, S P X ) are predicted, only one state has been confirmed: the £(1285) with J PC =1 + + . 3 In this Letter we stress some aspects of the second J= F=0, J PC = 1 + + meson, which we will call the D f . Together with the D(1285), the isotriplet ^(1070), and the lower axial-vector kaon isodoublets K A (\2A0), such a meson would complete the set of nine 3 P X states expected from the quark model. The properties we expect on theoretical grounds are the following: (a) assignment to a weakly mixed SU(3) singlet, (b) a mass of ~950 MeV, (c) decay modes 777777 and -n^y'y, and (d) possible suppression of the p signal in the 7r + 7r~ effective-mass spectrum of the n + ir~y final state.These predictions are of special relevance at present because of the recent claim for a new meson with properties (b)-(d). 4 This meson, called M(953), 4 is distinguished from the rf (958) only by the absence of any appreciable p in its 7i + u"y final state. The?]', in contrast, appears to decay to TT + IT'Y predominantly via py. 3,4 While one feels uneasy about two states so close in mass sharing common decay modes except for the difference just mentioned, our theoretical expectation of a D f (1 + + , /= r=0) near the rf (0" + , I=Y = 0) suggests that this degeneracy may not be accidental. 5 It should be noted, however, that a JPC = ^ + -^ /= i assignment instead of 1 + + , 1= Y = 0 for the M(953) is not ruled out by the data of Ref. 4 and will be discussed as well.(a) Unitary singlet nature. -A hierarchy of constraints based on duality-in which the most reliable follow from PP^PP, the next most reliable from PV-+PV, and the least reliable from VV^VV (P-0~, V=l" mesons)-has been used to predict exchange degeneracies. 6 * 7 In such a system the omission of the "worst" VV constraints predicts nonet structure for mesons of J PC = 2 ++ , 1"", 2"", andl + ", but only octet structure for 0" + and 1 ++ . The unitary singlets of 0" + and 1 + + do not couple to PP or PV, and hence are not involved in the "good" constraints, which are assumed to determine the observed exchange degeneracies. The remaining eight 0" + and 1 + + mesons are then expected to form weakly mixed octets. This is certainly the case for the 77, K, and 77; it seems to hold...

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“…Note that it is not possible to observe this type of SU (3) violation by t>ludying 1r ·1r iule:rd.ctious, which c1.re cuuslraineu by isotopic spin invariance. To study violations of the quark model classification scheme that do not break SU (3) symmetry, one must examine p Tr and Cc) Tr channels, where…”

Section: • Section I-introductionmentioning

confidence: 99%

“…Thus, if the 11Tr enhancement were 1-+ (C must be even from G parity conservation), the Tr n(980) wave function would be antisymmetric (P wave) even though the SU (3) wave function must be symmetric to give positive C parity.…”

Section: • Section I-introductionmentioning

confidence: 99%

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The meson spectrum in the reaction PP → dMM

Wicklund¹

1970

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Evidence for a singly charged boson of mass 962 MeV and narrow width

Cited by 55 publications

References 5 publications

The non-strange neutral meson spectrum from [pi]⁻p-->M°n at 2.4 GeV/c

The non-strange neutral meson spectrum from [pi]⁻p-->M°n at 2.4 GeV/c

Ninth Meson withJPC=1++

The meson spectrum in the reaction PP → dMM

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