χc2 formation in two-photon collisions at LEP

Acciarri, M.; Achard, P.; Adriani, O.; Aguilar-Benı́tez, M.; Alcaraz, J.; Alemanni, G.; Allaby, J.; Aloisio, A.; Alviggi, M. G.; Ambrosi, G.; Anderhub, H.; Andreev, V.; Angelescu, T.; Anselmo, F.; Arefiev, A.; Azemoon, T.; Aziz, T.; Bagnaia, P.; Baksay, L.; Balandras, A.; Ball, R. C.; Banerjee, S.; Banerjee, S.; Banicz, K.; Barczyk, A.; Barillère, R.; Barone, L.; Bartalini, P.; Basile, M.; Battiston, R.; Bay, A.; Becattini, F.; Becker, U.; Behner, F.; Berdugo, J.; Berges, P.; Bertucci, B.; Betev, B.L.; Bhattacharya, S.; Biasini, M.; Biland, A.; Blaising, J. J.; Blyth, S.; Bobbink, G. J.; Böck, R.; Böhm, A.; Boldizsár, L.; Borgia, B.; Bourilkov, D.; Bourquin, M.; Braccini, S.; Branson, J. G.; Brigljević, V.; Brochu, F. M.; Buffini, A.; Buijs, A.; Bürger, J.; Burger, W. J.; Busenitz, J.; Button, A.; Cai, X. D.; Campanelli, M.; Capell, M.; Romeo, G. Cara; Carlino, G.; Cartacci, A. M.; Casaus, J.; Castellini, G.; Cavallari, F.; Cavallo, N.; Cecchi, C.; Cerrada, M.; Cesaroni, F.; Chamizo, M.; Chang, Y. H.; Chaturvedi, U. K.; Chemarin, M.; Chen, A.; Chen, G.; Chen, G.M.; Chen, H.F.; Chen, H.S.; Chéreau, X.; Chiefari, G.; Cifarelli, L.; Cindolo, F.; Civinini, C.; Clare, I.; Clare, R.; Coignet, G.; Colijn, A. P.; Colino, N.; Costantini, S.; Cotorobai, F.; Cruz, B. De La; Csilling, Á.; Dai, T.; Dalen, J. A. van; D’Alessandro, R.; Asmundis, R. de; Déglon, P.; Degré, A.; Deiters, K.; Volpe, D. della; Denes, P.; DeNotaristefani, F.; Salvo, A. De; Diemoz, M.; Dierendonck, D. van; Lodovico, F. Di; Dionisi, C.; Dittmar, M.; Dominguez, A.; Doria, A.; Dova, M. T.; Duchesneau, D.; Dufournand, D.; Duinker, P.; Durán, I.; Mamouni, H. El; Engler, A.; Eppling, F. J.; Erné, F.C.; Extermann, P.; Fabre, Michel; Faccini, R.; Falagán, M. A.; Falciano, S.; Favara, A.; Fay, J.; Fedin, O. L.; Felcini, M.; Ferguson, T.; Ferroni, F.; Fesefeldt, H.; Fiandrini, E.; Field, J. 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D.; Organtini, G.; Ostonen, R.; Palomares, C.; Pandoulas, D.; Paoletti, S.; Paolucci, P.; Park, H.K.; Park, I.H.; Pascale, Gennaro De; Passaleva, G.; Patricelli, S.; Paul, T.; Pauluzzi, M.; Paus, C.; Pauß, F.; Peach, D.; Pedace, M.; Pei, Y. J.; Pensotti, S.; Perret-Gallix, D.; Petersen, B. A.; Petrak, S.; Piccolo, D.; Pieri, M.; Piroué, P.; Pistolesi, E.; Plyaskin, V.; Pohl, M.; Pojidaev, V.; Postema, H.; Pothier, J.; Produit, N.; Prokofiev, D.; Quartieri, J.; Rahal-Callot, G.; Raja, N.; Rancoita, P.G.; Raven, G.; Razis, P. A.; Ren, D.; Rescigno, M.; Reucroft, S.; Rhee, T. van; Riemann, S.; Riles, K.; Robohm, A.; Rodin, J.; Roe, B.P.; Romero, L.; Rosier‐Lees, S.; Roth, Stefan; Rubio, J. A.; Ruschmeier, D.; Rykaczewski, H.; Sakar, S.; Salicio, J.; Sánchez, E.; Sanders, M.P.; Sarakinos, M. E.; Schäfer, Christian; Schegelsky, V. A.; Schmidt-Kaerst, S.; Schmitz, D.; Scholz, N.; Schopper, H.; Schotanus, D. 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doi:10.1016/s0370-2693(99)00279-8

Cited by 20 publications

(6 citation statements)

References 21 publications

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“…The compilation [25] provides us with the value close to that of [35]. The value found in our fit agrees with data reported by [32,33,34] and contradicts the magnitude from [35].…”

Section: Radiative Transitionssupporting

confidence: 83%

“…Experimental values of partial widths [25,32,33,34,35] together with the widths obtained With the determined vertices for G γ→cc (s), we can obtain the widths of the two-photon decays (see [1] for more detail). The comparison of experimentally measured widths with those obtain in our calculations is given below: (15) Let us emphasize that the data do not tell us definitely about the width χ c2 (3556) → γγ.…”

Section: Radiative Transitionsmentioning

confidence: 99%

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Quark-antiquark states and their radiative transitions in terms of the spectral integral equation: Charmonia

et al. 2007

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In the precedent paper of the authors (hep-ph/0510410), the bb states were treated in the framework of the spectral integral equation, together with simultaneous calculations of radiative decays of the considered bottomonia. In the present paper, such a study is carried out for the charmonium (cc) states. We reconstruct the interaction in the ccsector on the basis of data for the charmonium levels with J P C = 0 −+ , 1 −− , 0 ++ , 1 ++ , 2 ++ , 1 +− and radiative transitions ψ(2S) → γχ c0 (1P ), γχ c1 (1P ), γχ c2 (1P ), γη c (1S) and χ c0 (1P ), χ c1 (1P ), χ c2 (1P ) → γJ/ψ. The cc levels and their wave functions are calculated for the radial excitations with n ≤ 6. Also, we determine the cc component of the photon wave function using the e + e − annihilation data: e + e − → J/ψ(3097), ψ(3686), ψ(3770), ψ(4040), ψ(4160), ψ(4415) and perform the calculations of the partial widths of the twophoton decays for the n = 1 states: η c0 (1S), χ c0 (1P ), χ c2 (1P ) → γγ, and n = 2 states: η c0 (2S) → γγ, χ c0 (2P ), χ c2 (2P ) → γγ. We discuss the status of the recently observed cc states X(3872) and Y (3941): according to our results, the X(3872) can be either χ c1 (2P ) or η c2 (1D), while Y (3941) is χ c2 (2P ).

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“…The compilation [25] provides us with the value close to that of [35]. The value found in our fit agrees with data reported by [32,33,34] and contradicts the magnitude from [35].…”

Section: Radiative Transitionssupporting

confidence: 83%

Section: Radiative Transitionsmentioning

confidence: 99%

Quark-antiquark states and their radiative transitions in terms of the spectral integral equation: Charmonia

et al. 2007

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show abstract

“…[201] and on resonances in Refs. [202][203][204][205][206][207][208]. The selected topics discussed below are the total hadronic cross-section for photon-photon scattering, σ γγ , and more exclusively, hadron production, jet cross-sections and the production of heavy quarks.…”

Section: Photon-photon Scattering Atmentioning

confidence: 99%

The photon structure from deep inelastic electron–photon scattering

2000

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The present knowledge of the structure of the photon is presented with emphasis on measurements of the photon structure obtained from deep inelastic electron-photon scattering at e + e − colliders. This review covers the leptonic and hadronic structure of quasi-real and also of highly virtual photons, based on measurements of structure functions and differential cross-sections. Future prospects of the investigation of the photon structure in view of the ongoing LEP2 programme and of a possible linear collider are addressed. The most relevant results in the context of measurements of the photon structure from photon-photon scattering at LEP and from photonproton and electron-proton scattering at HERA are summarised.

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“…While there are only upper limits on γγ partial widths for the χ c0 resonance exist so far [14,15], there are a number of measurements for the χ c2 made by L3 [18,19], E835 [20], OPAL[21], CLEO [2,22], E760 [2], and TPC[2] since 1990. For χ c0 , the limits are Γ γγ < 6.2 keV reported by CLEO and < 5.5 keV reported recently by L3 (both 95% C.L.…”

Section: 3 S 1 : J/ψmentioning

confidence: 99%