High statistics study of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>f</mml:mi><mml:mn>0</mml:mn></mml:msub><mml:mo stretchy="false">(</mml:mo><mml:mn>980</mml:mn><mml:mo stretchy="false">)</mml:mo></mml:math>resonance in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>γ</mml:mi><mml:mi>γ</mml:mi><mml:mo>→</mml:mo><mml:msup><mml:mi>π</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:msup><mml:mi>π</mml:mi><mml:mo>−</mml:mo></mml:ms

Mori, Takashi; Uehara, S.; Watanabe, Y.; Abe, K.; Adachi, I.; Aihara, H.; Anipko, D.; Arinstein, K.; Aulchenko, V.; Bakich, A. M.; Barberio, E. L.; Bay, A.; Bedny, I.; Belous, K.; Bitenc, U.; Bizjak, I.; Bondar, A.; Bożek, A.; Bračko, M.; Brodzicka, J.; Browder, T. E.; Chang, M.-C.; Chang, P.; Chen, A.; Chen, W. T.; Cheon, B. G.; Chistov, R.; Choi, Y.; Dalseno, J.; Dash, M.; Eidelman, S.; Epifanov, D.; Fratina, S.; Gabyshev, N.; Gershon, T.; Golob, B.; Ha, H.; Hayasaka, K.; Hayashii, H.; Hazumi, M.; Heffernan, D.; Hokuue, T.; Hoshi, Y.; Hou, S.; Hou, W.-S.; Iijima, T.; Ikado, K.; Imoto, A.; Inami, K.; Ishikawa, A.; Itoh, R.; Iwasaki, M.; Iwasaki, M.; Kaji, Hiroshi; Kang, J. H.; Kawai, H.; Kawasaki, T.; Khan, H. R.; Kibayashi, A.; Kichimi, H.; Kim, Y. J.; Korpar, S.; Križan, P.; Krokovny, P.; Kulasiri, R.; Kumar, Ramanuj; Kuzmin, A.; Kwon, Y. J.; Lee, M. J.; Lee, S. E.; Lesiak, T.; Limosani, A.; Lin, S. W.; Liventsev, D.; MacNaughton, J.; Majumder, G.; Mandl, F.; Matsumoto, T.; Miyake, H.; Miyata, H.; Miyazaki, Y.; Mizuk, R.; Moloney, G. R.; Nagasaka, Y.; Nakao, M.; Nakazawa, H.; Natkaniec, Z.; Nishida, S.; Nitoh, O.; Noguchi, S.; Ogawa, S.; Ohshima, T.; Okuno, S.; Olsen, S. L.; Ono, Shunsuke; Onuki, Y.; Ozaki, H.; Pakhlov, P.; Pakhlova, G.; Park, H.; Park, K. S.; Peak, L. S.; Pestotnik, R.; Piilonen, L. E.; Poluektov, A.; Sahoo, H.; Sakai, Y.; Satoyama, N.; Schietinger, T.; Schneider, O.; Seidl, R.; Senyo, K.; Sevior, M. E.; Shapkin, M.; Shibuya, H.; Shwartz, B.; Singh, J. B.; Sokolov, A.; Somov, A.; Soni, N.; Stanič, S.; Starič, M.; Stoeck, H.; Sumiyoshi, T.; Takasaki, F.; Tamai, K.; Tanaka, M.; Taylor, G. N.; Teramoto, Y.; Tian, X. C.; Tikhomirov, I.; Tsuboyama, T.; Tsukamoto, T.; Uglov, T.; Uno, S.; Urquijo, P.; Usov, Y.; Varner, G.; Villa, S.; Wang, C. C.; Wang, C. H.; Won, E.; Xie, Qingguo; Yabsley, B.; Yamaguchi, A.; Yamashita, Y.; Yamauchi, M.; Zhang, C. C.; Zhang, Z. P.; Zhilich, V.; Zhulanov, V.; Zupanc, A.

doi:10.1103/physrevd.75.051101

Cited by 84 publications

(27 citation statements)

References 26 publications

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“…This formalism automatically takes into account the key final state interactions and allows for the only robust determination of resonance couplings. Moreover, as we present here, recent data from Belle on γγ → π þ π − [13], π 0 π 0 [14], and K s K s [15] considerably sharpen the analysis by an increase in statistics and precision of at least a factor of 10.…”

Section: Introductionmentioning

confidence: 62%

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Comprehensive amplitude analysis ofγγ→π+π−,π0π0and
Dai
¹
,
Pennington
²

2014
Phys. Rev. D

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In this paper we perform an amplitude analysis of essentially all published pion and kaon pair production data from two-photon collisions below 1.5 GeV. This includes all the high statistics results from Belle, as well as older data from Mark II at SLAC, CELLO at DESY, and Crystal Ball at SLAC. The purpose of this analysis is to provide as close to a model-independent determination of the γγ to meson pair amplitudes as possible. Having data with limited angular coverage, typically j cos θj < 0.6-0.8, and no polarization information for reactions in which spin is an essential complication, the determination of the underlying amplitudes might appear an intractable problem. However, imposing the basic constraints required by analyticity, unitarity, and crossing symmetry makes up for the experimentally missing information. Above 1.5 GeV multimeson production channels become important, and we have too little information to resolve the amplitudes. Nevertheless, below 1.5 GeV the two-photon production of hadron pairs serves as a paradigm for the application of S-matrix techniques. Final state interactions among the meson pairs are critical to this analysis. To fix these, we include the latest ππ → ππ, KK scattering amplitudes given by dispersive analyses, supplemented in the KK threshold region by the recent precision Dalitz plot analysis from BABAR. With these hadronic amplitudes built into unitarity, we can constrain the overall description of γγ → ππ and KK data sets, both integrated and differential cross sections, including the high statistics charged and neutral pion, as well as K s K s , data from Belle. Since this analysis invokes coupled hadronic channels, having data on both ππ and KK reduces the solution space to essentially a single form in the region where these channels saturate unitarity. For the ππ channel, the separation of isospin-0 and -2 and helicity-0 and -2 components is complete. We present the partial wave amplitudes, show how well they fit all the available data, and give the two-photon couplings of scalar and tensor resonances that appear. These partial waves are important inputs into forthcoming dispersive calculations of hadronic light-by-light scattering. PHYSICAL REVIEW D 90, 036004 (2014) 036004-2 LING-YUN DAI AND M. R. PENNINGTON PHYSICAL REVIEW D 90, 036004 (2014) 036004-4 FIG. 8 (color online). Fit to the γγ → π þ π − differential cross section of CELLO experiment. Here, Cello1 is from Harjes [3] and Cello2 from Behrend et al. [4]. The numbers give the central energy in GeV of each angular distribution listed in order of the cross section at z ¼ 0, where z ¼ cos θ. COMPREHENSIVE AMPLITUDE ANALYSIS OF … PHYSICAL REVIEW D 90, 036004 (2014) 036004-15 FIG. 9 (color online). Fit to the γγ → π þ π − differential cross section of the Belle experiment [13]. The numbers give the central energy in GeV of each angular distribution listed in order of the cross section at z ¼ 0, where z ¼ cos θ. The data are normalized so that the integrated cross section is just a sum of the differential cross sect...

show abstract

Section: Introductionmentioning

confidence: 62%

“…LING-YUN DAI AND M. R. PENNINGTON PHYSICAL REVIEW D 90, 036004 (2014) 036004-16 FIG. 10 (color online).Fit to the γγ → π þ π − differential cross section of the Belle experiment [13]. The numbers give the central energy in GeV of each angular distribution listed in order of the cross section at z ¼ 0, where z ¼ cos θ.…”

mentioning

confidence: 99%

Comprehensive amplitude analysis ofγγ→π+π−,π0π0and
Dai
¹
,
Pennington
²

2014
Phys. Rev. D

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show abstract

“…þ À , we have used the partial width Àðf 0 ð980Þ ! þ À Þ ¼ ð34:2 þ13:9þ8:8 À11:8À2:5 Þ MeV (2.22) measured by Belle [45]. In this work, we shall specifically use g f 0 ð980Þ!…”

Section: Numerical Resultsmentioning

confidence: 99%

Branching fractions and directCPviolation in charmless three-body decays ofBmesons

2013

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Charmless three-body decays of B mesons are studied using a simple model based on the framework of the factorization approach. Hadronic three-body decays receive both resonant and nonresonant contributions. Dominant nonresonant contributions to tree-dominated three-body decays arise from the b ! u tree transition which can be evaluated using heavy-meson chiral perturbation theory valid in the soft-meson limit. For penguin-dominated decays, nonresonant signals come mainly from the penguin amplitude governed by the matrix elements of scalar densities hM 1 M 2 j " q 1 q 2 j0i. We use the measurements of " B 0 ! K S K S K S to constrain the nonresonant component of hK "Kj" ssj0i. The intermediate vector-meson contributions to three-body decays are identified through the vector current, while the scalar-meson resonances are mainly associated with the scalar density. While the calculated direct CP violation in B À ! K þ K À K À and B À ! þ À À decays agrees well with experiment in both magnitude and sign, the predicted CP asymmetries in B À ! À K þ K À and B À ! K À þ À have incorrect signs when confronted with experiment. It has been conjectured recently that a possible resolution to this CP puzzle may rely on final-state rescattering of þ À and K þ K À . Assuming a large strong phase associated with the matrix element hKj" sqj0i arising from some sort of power corrections, we fit it to the data of K À þ À and find a correct sign for À K þ K À . We predict some testable CP violation in " B 0 ! K þ K À 0 and K þ K À K S . In the low-mass regions of the Dalitz plot, we find that the regional CP violation is indeed largely enhanced with respect to the inclusive one, though it is still significantly below the data. In this work, strong phases arise from effective Wilson coefficients, propagators of resonances, and the matrix element of the scalar density hM 1 M 2 j " q 1 q 2 j0i.

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“…A clear signal for the f 0 (980) resonance is observed [680,686]. The mass spectrum was fitted with Table 30 Radiative widths of states contributing to → for the two solutions (dip and peak) from [1107] and predicted widths of scalar mesons for different compositions [1109] [1111] a two-channel Breit-Wigner amplitude and interfering and non-interfering background terms.…”

Section: Scalar Mesons In 2-photon Fusionmentioning

confidence: 99%

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 ...

show abstract

High statistics study of thef0(980)resonance inγγ→π+π−

Cited by 84 publications

References 26 publications

Comprehensive amplitude analysis ofγγ→π+π−,π0π0and
Dai
¹
,
Pennington
²

2014
Phys. Rev. D

Comprehensive amplitude analysis ofγγ→π+π−,π0π0and
Dai
¹
,
Pennington
²

2014
Phys. Rev. D

Branching fractions and directCPviolation in charmless three-body decays ofBmesons

Glueballs, hybrids, multiquarks

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Product

Resources

About

High statistics study of thef0(980)resonance inγγ→π+π−

Cited by 84 publications

References 26 publications

Comprehensive amplitude analysis ofγγ→π+π−,π0π0andDai1, Pennington2 2014Phys. Rev. D

Comprehensive amplitude analysis ofγγ→π+π−,π0π0andDai1, Pennington2 2014Phys. Rev. D

Branching fractions and directCPviolation in charmless three-body decays ofBmesons

Glueballs, hybrids, multiquarks

Contact Info

Product

Resources

About

Comprehensive amplitude analysis ofγγ→π+π−,π0π0and
Dai
¹
,
Pennington
²

2014
Phys. Rev. D

Comprehensive amplitude analysis ofγγ→π+π−,π0π0and
Dai
¹
,
Pennington
²

2014
Phys. Rev. D