Observation of the two photon cascade 3.7 → 3.1 + γγ via an intermediate state Pc

DASP-Collaboration,; Braunschweig, W.; Martyn, H. U.; Sander, H. G.; Schmitz, D.; Sturm, Walter; Wallraff, W.; Berkelman, K.; Cords, D.; Felst, R.; Gadermann, E.; Grindhammer, G.; Hultschig, H.; Joos, P.; Koch, W.; ̈tz, U. Ko; Krehbiel, H.; Kreinick, D. L.; Ludwig, J.; Mess, K. H.; Moffeit, K. C.; Petersen, A.; Poelz, G.; Ringel, Jeanne S.; Sauerberg, K.; ̈ser, P. Schmu; Vogel, G.; Wiik, B.H.; Wolf, G.; Buschhorn, G.; Kotthaus, R.; Kruse, U.; Lierl, H.; Oberlack, H.; Pretzl, K.; Schliwa, Manfred; Orito, S.; Suda, T.; Totsuka, Y.; Yamada, Shigeru

doi:10.1016/0370-2693(75)90482-7

Cited by 131 publications

(10 citation statements)

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“…29. These contributions are related to a 4-point qqQg vertex, Γ (4) µν (c 1 , c 2 , q, P ), whose form is, in general, unknown, although it must obey some general constraints 125,81,132 :…”

Section: Gauge Invariancementioning

confidence: 99%

J/Ψ, Ψ′ and ϒ Production at Hadron Colliders: A Review

Lansberg

2006

Int. J. Mod. Phys. A

229

279

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We give an overview of the present status of knowledge of the production of J/ψ, ψ ′ and Υ in high-energy hadron collisions. We first present two early models, namely the Colour-Singlet Model (CSM) and the Colour-Evaporation Model (CEM). The first is the natural application of pQCD to quarkonium production and has been shown to fail dramatically to describe experimental data, the second is its phenomenological counterpart and was introduced in the spirit of the quark-hadron duality in the late seventies. Then, we expose the most recent experimental measurements of J/ψ, ψ ′ and Υ prompt and direct production at nonzero p T from two high-energy hadron colliders, the Tevatron and RHIC. In a third part, we review six contemporary models describing J/ψ, ψ ′ and Υ production at nonzero p T .(where the sum stands for S, L, J and the colour. The long-distance matrix element (LDME) O Q [ 2S+1 L (1,8) J ] takes account of the transition between the QQ pair and the final physical state Q. Its power scaling rule comes both from the suppression in v of the Fock-state component [ 2S+1 L (1,8) J ] in the wave function of Q and from the scaling of the NRQCD interaction responsible for the transition. Usually, one defines O Q [ 2S+1 L (1,8) J (1,8) J ] to the dominant quarkonium Q Fock state. e The second line of Eq. (26) is nothing but a short way of expressing this operator. J/ψ, ψ ′ and Υ Production at Hadron Colliders: a review 33The idea of combining fragmentation as the main source of production with allowed transitions between a χ c to a 3 S 1 in a colour-octet state, was applied by Braaten and Yuan 45 . Indeed, similar formulae to the one written for fragmentation within the CSM can be written for fragmentation functions in NRQCD 78 :

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Section: Gauge Invariancementioning

confidence: 99%

J/Ψ, Ψ′ and ϒ Production at Hadron Colliders: A Review

Lansberg

2006

Int. J. Mod. Phys. A

229

279

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“…In the summer of '75 -after a year of upper limits incompatible with the theoretical expectations-evidence finally arose for the P -wave charmonia. [111][112][113] The DESY experimentalists did not refer to the theorists who suggested their search; they are hereby punished: they do not get a reference, and they will remain eternally ignorant of my juicy version of the story of their competition with SLAC.…”

Section: Back To the Past Againmentioning

confidence: 99%

QCD, from its inception to its stubbornly unsolved problems

Rújula

2019

Int. J. Mod. Phys. A

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“…The 1P levels of charmonium were identified nearly 20 years ago in electric dipole transitions from the ψ ′ (2S) [14]. Recently they have been studied with great precision in proton-antiproton formation experiments [15].…”

Section: A Charmonium 2p Statesmentioning

confidence: 99%

Spacings of quarkonium levels with the same principal quantum number

Grant¹,

Rosner²,

Martin³

et al. 1996

Phys. Rev. D

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The spacings between bound-state levels of the Schrödinger equation with the same principal quantum number N but orbital angular momenta \ell differing by unity are found to be nearly equal for a wide range of power potentials V = \lambda r^\nu, with E_{N \ell} \approx F(\nu, N) - G(\nu,N) \ell. Semiclassical approximations are in accord with this behavior. The result is applied to estimates of masses for quarkonium levels which have not yet been observed, including the 2P c \bar c states and the 1D b \bar b states

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Observation of the two photon cascade 3.7 → 3.1 + γγ via an intermediate state Pc

Cited by 131 publications

References 0 publications

J/Ψ, Ψ′ and ϒ Production at Hadron Colliders: A Review

J/Ψ, Ψ′ and ϒ Production at Hadron Colliders: A Review

QCD, from its inception to its stubbornly unsolved problems

Spacings of quarkonium levels with the same principal quantum number

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