f1(1285) formation in two-photon collisions at LEP

Achard, P.; Adriani, O.; Aguilar-Benı́tez, M.; Alcaraz, J.; Alemanni, G.; Allaby, J.; Aloisio, A.; Alviggi, M. G.; Anderhub, H.; Andreev, V.; Anselmo, F.; Arefiev, A.; Azemoon, T.; Aziz, T.; Bagnaia, P.; Bajo, A.; Baksay, G.; Baksay, L.; Baldew, S.V.; Banerjee, S.; Barczyk, A.; Barillère, R.; Bartalini, P.; Basile, M.; Batalova, N.; Battiston, R.; Bay, A.; Becattini, F.; Becker, U.; Behner, F.; Bellucci, L.; Berbeco, R.; Berdugo, J.; Berges, P.; Berrueco, B.; Betev, B. L.; Biasini, M.; Biglietti, M.; Biland, A.; Blaising, J. J.; Blyth, S.; Bobbink, G. J.; Böhm, A.; Boldizsár, L.; Borgia, B.; Bottai, S.; Bourilkov, D.; Bourquin, M.; Braccini, S.; Branson, J. G.; Brochu, F. M.; Buijs, A.; Burger, J. D.; Burger, W. J.; Cai, X. D.; Capell, M.; Romeo, G. Cara; Carlino, G.; Cartacci, A. M.; Casaus, J.; Cavallari, F.; Cavallo, N.; Cecchi, C.; Cerrada, M.; Chamizo, M.; Chang, Y. H.; Chemarin, M.; Chen, A.; Chen, G.; Chen, G. M.; Chen, H. 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W.; Guida, M.; Gulik, R. van; Gupta, Virendra K.; Gurtu, A.; Gutay, L.; Haas, D.; Hatzifotiadou, D.; Hebbeker, T.; Hervé, A.; Hirschfelder, J.; Hofer, H.; Hohlmann, M.; Holzner, G.; Hou, S.; Hu, Y.; Jin, B. N.; Jones, L. W.; Jong, P. de; Josa-Mutuberria, I.; Käfer, D.; Kaur, M.; Kienzle‐Focacci, M. N.; Kim, J. K.; Kirkby, J.; Kittel, W.; Klimentov, A.; König, A. C.; Kopál, M.; Koutsenko, V.; Kräber, M.; Kraemer, R. W.; Krenz, W.; Krüger, A.; Kunin, A.; Guevara, PL de; Laktineh, Imad Baptiste; Landi, G.; Lebeau, M.; Lebedev, A.; Lebrun, P.; Lecomte, P.; Lecoq, P.; Coultre, P. Le; Goff, J. M. Le; Leiste, R.; Levtchenko, P.; Li, C.; Likhoded, S.; Lin, C. H.; Lin, W.; Linde, F.; Lista, L.; Liu, Z. A.; Lohmann, W.; Longo, E.; Lu, Y. S.; Lübelsmeyer, K.; Luci, C.; Luminari, L.; Lustermann, W.; G., W.; Malgeri, L.; Малинин, А.; Mañax, C.; Mangeol, D.; Mans, J.; Martin, J. P.; Marzano, F.; Mazumdar, K.; McNeil, R. R.; Mele, S.; Merola, L.; Meschini, M.; Metzger, W. 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M.; Weber, M.; Wienemann, P.; Wilkens, H. G.; Wynhoff, S.; Xia, L.; Xu, Z. Z.; Yamamoto, J.; Yang, B. Z.; Yang, C. G.; Yang, H. J.; Yang, Min; Yeh, S. C.; Zalite, A.; Zalite, Yu; Zhang, Z. P.; Zhao, Jiawei; Zhu, G. Y.; Zhu, R. Y.; Zhuang, H.L.; Zichichi, A.; Zilizi, G.; Zimmermann, B.; Zöller, Margot

doi:10.1016/s0370-2693(01)01477-0

Cited by 73 publications

(111 citation statements)

References 22 publications

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“…The relevant parameters are summarized in Table II. In another sum rule for axial-vector (A) mesons, the helicity-2 [6], f1(1285), and f1(1420) [7,8]. Γγγ for an axial-vector meson shall read Γγγ defined in Eq.…”

Section: Introductionmentioning

confidence: 99%

“…Two-photon production of axial-vector mesons, f 1 (1285) and f 1 (1420), which is interpreted as a two-photon fusion of a longitudinal (helicity-0) and a real photon, was studied by the L3 collaboration, who measured the parameters listed in Table II [7,8]. For scalar or tensor mesons, no significant data for the high-Q 2 region beyond the ρ-meson mass scale exist to be compared with QCD predictions; only yields consistent with zero were reported for γ * γ → f 2 (1270) → π + π − at Q 2 > 1.0 GeV 2 by the TPC/Two-Gamma collaboration [13].…”

Section: Introductionmentioning

confidence: 99%

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Study ofπ0pair production in single-tag two-photon collisions

Masuda¹,

Uehara²,

Watanabe³

et al. 2016

Phys. Rev. D

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We report a measurement of the differential cross section of π 0 pair production in single-tag two-photon collisions, γ * γ → π 0 π 0 , in e + e − scattering. The cross section is measured for Q 2 3 up to 30 GeV 2 , where Q 2 is the negative of the invariant mass squared of the tagged photon, in the kinematic range 0.5 GeV < W < 2.1 GeV and | cos θ * | < 1.0 for the total energy and pion scattering angle, respectively, in the γ * γ center-of-mass system. The results are based on a data sample of 759 fb −1 collected with the Belle detector at the KEKB asymmetric-energy e + e − collider. The transition form factor of the f0(980) and that of the f2(1270) with the helicity-0, -1, and -2 components separately are measured for the first time and are compared with theoretical calculations.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Study ofπ0pair production in single-tag two-photon collisions

Masuda¹,

Uehara²,

Watanabe³

et al. 2016

Phys. Rev. D

Self Cite

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“…The isovector a 0 (980) has been studied in pp annihilations [9], in π − p collisions [10], and γγ interactions [11]. Data on radiative φ-decays [12,13] are interpreted in terms of a 0 /f 0 production in the channels φ→γa 0 /f 0 →γπ 0 η/π 0 π 0 .…”

mentioning

confidence: 99%

a0+(980)-Resonance Production inpp→dK+
Kleber¹,
Büscher²,
Chernyshev³
et al. 2003
Phys. Rev. Lett.
31
5
48
0
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“…Hence the cross section should vanish as the squared momentum transfer q 2 goes to zero. This behavior is familiar from the two-photon reaction e + e − → e + e − f 1 (1285) [20][21][22]. Here the excitation of the spin-1 f 1 by two real photons is forbidden by the Landau-Yang theorem [23,24], so at least one of the electrons must undergo significant recoil.…”

Section: Electroproduction In Pion Exchangementioning

confidence: 99%

Test for exotic isoscalar resonance dominatingD0→π+π−π0decays

Gronau

Rosner

2015

Phys. Rev. D

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The decay D 0 → π + π − π 0 appears to be dominated by ρπ states in a configuration of zero total isotopic spin. The spin J, parity P , and charge-conjugation eigenvalue C of this final state are therefore J P C = 0 −− , which cannot be formed of a quark q and antiquarkq. If a resonance near M(D 0 ) dominates the final state, it must be a hybrid composed of a quark-antiquark pair and a constituent gluon, or a tetraquark qqqq. A test for this resonance in electroproduction is proposed.PACS codes: 12.39. Mk, 13.25.Ft, 13.60.Le, 14.40.Rt I INTRODUCTIONThe decay of the charmed meson D 0 into π + π − π 0 exhibits a curious dominance by the state of zero total isotopic spin [1,2]. Since this three-pion state has odd G-parity and I = 0, its charge-conjugation eigenvalue C is negative. Since it is a three-pion state in a state of zero total angular momentum J, its parity P is also negative. It thus has J P C = 0 −− , a CP-even configuration which cannot be formed of a quark and antiquark. The even CP property has been confirmed by subsequent analyses [3,4]. The latest finds the three-pion state to have CP = + (97.3 ± 1.7)% of the time, which includes a small (few-%) contribution from I = 2 [5]. This observation has a useful implication for the determination of the CP-violating CKM (Cabibbo-Kobayashi-Maskawa) phase γ in decays of the class B ±,0 → D CP K ( * )±,0 [6,7]. The dominance of I = 0 can be reproduced [5] in flavor-SU(3) analyses of all P V decays of charmed mesons, where P and V stand for light pseudoscalar and vector mesons. Topological amplitudes T ("color-favored tree"), C ("color-suppressed tree"), and E ("exchange") cooperate in such a way as to give I = 0 intensity fractions of (92.9 ± 6.7)% in the fit of Ref. [8] and (90.9 ± 18.2)% in the fit of Ref. [9]. The possibility of dominance by a non-qq resonance near M(D 0 ) ≃ 1865 MeV was mentioned in Refs. [2,5]. In the present work we propose a means of testing this hypothesis. This paper is organized as follows. In Section II we review some properties of resonances in charm decays and of a new hybrid state near M D . We then stress the need for electroproduction of a spinless resonance via pion exchange in Sec. III. Possible interpretations 1 of a signal are described in Sec. IV. A detailed program for anticipating signal strength is set forth in Sec. V, while possible variants to this approach are noted in Sec. VI. Sec. VII summarizes. An Appendix examines assumed relations among photoproduction of light mesons. II RESONANCES IN CHARM DECAYSThe role of nearby resonance states in charmed meson decays has been pointed out a long time ago [10]. . We denote the proposed resonance by X(0 −− ), where the quantity in parentheses refers to J P C . The Dalitz plot for D 0 → π + π − π 0 appears to be dominated by three ρπ bands of approximately equal strength; they would be strictly equal in the I = 0 limit.A contribution of a given resonance R to D 0 decay into a final state f is given bywhere R|H W |D 0 is the weak Hamiltonian matrix element between D 0 and R stat...

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f1(1285) formation in two-photon collisions at LEP

Cited by 73 publications

References 22 publications

Study ofπ0pair production in single-tag two-photon collisions

Study ofπ0pair production in single-tag two-photon collisions

a0+(980)-Resonance Production inpp→dK+
Kleber¹,
Büscher²,
Chernyshev³
et al. 2003
Phys. Rev. Lett.
31
5
48
0
View full text Add to dashboard Cite

Test for exotic isoscalar resonance dominatingD0→π+π−π0decays

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f1(1285) formation in two-photon collisions at LEP

Cited by 73 publications

References 22 publications

Study ofπ0pair production in single-tag two-photon collisions

Study ofπ0pair production in single-tag two-photon collisions

a0+(980)-Resonance Production inpp→dK+Kleber1, Büscher2, Chernyshev3 et al. 2003Phys. Rev. Lett.315480View full textAdd to dashboardCite

Test for exotic isoscalar resonance dominatingD0→π+π−π0decays

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a0+(980)-Resonance Production inpp→dK+
Kleber¹,
Büscher²,
Chernyshev³
et al. 2003
Phys. Rev. Lett.
31
5
48
0
View full text Add to dashboard Cite