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Journal Articles

Possibility of a new narrow $$Lambda^*$$ resonance near the $$Lambda eta$$ threshold

Tanida, Kiyoshi

AIP Conference Proceedings 2130, p.040019_1 - 040019_6, 2019/07

Journal Articles

Exotic and conventional quarkonium physics prospects at Belle II

Tanida, Kiyoshi

AIP Conference Proceedings 2130, p.040020_1 - 040020_6, 2019/07

Journal Articles

Hadronic Paschen-Back effect in P-wave charmonia under strong magnetic fields

Iwasaki, Sachio; Oka, Makoto; Suzuki, Kei*; Yoshida, Tetsuya*

International Journal of Modern Physics; Conference Series (Internet), 49, p.1960002_1 - 1960002_6, 2019/07

The hadronic Paschen-Back effects in P-wave charmonia are analyzed using the constituent quark models in strong magnetic field.

Journal Articles

Hadronic Paschen-Back effect

Iwasaki, Sachio; Oka, Makoto; Suzuki, Kei*; Yoshida, Tetsuya*

Physics Letters B, 790, p.71 - 76, 2019/03

 Times Cited Count:1 Percentile:14.11(Astronomy & Astrophysics)

We find a novel phenomenon induced by the interplay between a strong magnetic field and finite orbital angular momenta in hadronic systems, which is analogous to the Paschen-Back effect observed in the field of atomic physics. This effect allows the wave functions to drastically deform. We discuss anisotropic decay from the deformation as a possibility to measure the strength of the magnetic field in heavy-ion collision at LHC, RHIC and SPS, which has not experimentally been measured. As an example we investigate charmonia with finite orbital angular momentum in a strong magnetic field. We calculate the mass spectra and mixing rate. To obtain anisotropic wave functions, we apply the cylindrical Gaussian expansion method, where the Gaussian bases to expand the wave functions have different widths along transverse and longitudinal directions in the cylindrical coordinate.

Journal Articles

Further signatures to support the tetraquark mixing framework for the two light-meson nonets

Kim, H.*; Kim, K. S.*; Cheoun, M.-K.*; Jido, Daisuke*; Oka, Makoto

Physical Review D, 99(1), p.014005_1 - 014005_15, 2019/01

 Percentile:100(Astronomy & Astrophysics)

We investigate additional signatures to support the tetraquark mixing framework that has been recently proposed as a possible structure for the two nonets. We reexamine the mass ordering generated from the tetraquark nonets and show that this mass ordering is satisfied by the two nonets although the ordering in the heavy nonet is marginal. The marginal mass ordering can be regarded as another signature for tetraquarks because it can be explained partially by the hyperfine masses calculated from the tetraquark mixing framework. As a peculiar signature distinguished from the other approaches, we investigate the fall-apart coupling strengths into two vector mesons from our tetraquarks. Coupling strengths into the two-vector modes are found to enhance strongly in the heavy nonet while they are suppressed in the light nonet. The coupling ratios are found to be huge. This trend in the two-vector modes can provide another testing ground for the tetraquark mixing framework. Some experimental evidence related to the phenomena is discussed particularly from the resonances belonging to the heavy nonet.

Journal Articles

Measurement of the decays $$Lambda_cto Sigmapipi$$ at Belle

Berger, M.*; Tanida, Kiyoshi; Belle Collaboration*; 197 of others*

Physical Review D, 98(11), p.112006_1 - 112006_10, 2018/12

 Times Cited Count:2 Percentile:64.74(Astronomy & Astrophysics)

Journal Articles

Observation of $$Upsilon(2S)togamma eta_{b}(1S)$$ decay

Fulsom, B. G.*; Tanida, Kiyoshi; Belle Collaboration*; 197 of others*

Physical Review Letters, 121(23), p.232001_1 - 232001_8, 2018/12

 Percentile:100(Physics, Multidisciplinary)

Journal Articles

Evidence of a structure in $$bar{K}^{0} Lambda _{c}^{+}$$ consistent with a charged $$Xi _c(2930)^{+}$$, and updated measurement of $$bar{B}^{0} rightarrow bar{K}^{0} Lambda _{c}^{+} bar{Lambda }_{c}^{-}$$ at Belle

Li, Y. B.*; Tanida, Kiyoshi; Belle Collaboration*; 175 of others*

European Physical Journal C, 78(11), p.928_1 - 928_8, 2018/11

Journal Articles

Observation of $$e^+e^-topi^+pi^-pi^0chi_{b1,2}(1P)$$ and search for $$e^+e^-tophichi_{b1,2}(1P)$$ at $$sqrt{s}$$ = 10.96 - 11.05 GeV

Yin, J. H.*; Tanida, Kiyoshi; Belle Collaboration*; 189 of others*

Physical Review D, 98(9), p.091102_1 - 091102_9, 2018/11

 Percentile:100(Astronomy & Astrophysics)

Journal Articles

Observation of $$e^+e^- to gamma chi_{c1}$$ and search for $$e^+e^- to gamma chi_{c0}, gamma chi_{c2}$$, and $$gammaeta_c$$ at $$sqrt{s}$$ near 10.6 GeV at Belle

Jia, S.*; Tanida, Kiyoshi; Belle Collaboration*; 191 of others*

Physical Review D, 98(9), p.092015_1 - 092015_8, 2018/11

 Percentile:100(Astronomy & Astrophysics)

Journal Articles

Measurement of $$eta_c(1S)$$, $$eta_c(2S)$$, and nonresonant $$eta' pi^+ pi^-$$ production via two-photon collisions

Xu, Q. N.*; Tanida, Kiyoshi; Belle Collaboration*; 176 of others*

Physical Review D, 98(7), p.072001_1 - 072001_17, 2018/10

 Percentile:100(Astronomy & Astrophysics)

Journal Articles

Inclusive study of bottomonium production in association with an $$eta $$ meson in $$e^+e^-$$ annihilations near $$Upsilon (5S)$$

Tamponi, U.*; Tanida, Kiyoshi; Belle Collaboration*; 174 of others*

European Physical Journal C, 78(8), p.633_1 - 633_10, 2018/08

Journal Articles

Observation of an excited $$Omega^-$$ Baryon

Yelton, J.*; Tanida, Kiyoshi; Belle Collaboration*; 190 of others*

Physical Review Letters, 121(5), p.052003_1 - 052003_7, 2018/08

 Times Cited Count:7 Percentile:6.69(Physics, Multidisciplinary)

Journal Articles

Observation of $$Upsilon(4S)to eta' Upsilon(1S)$$

Guido, E.*; Tanida, Kiyoshi; Belle Collaboration*; 168of others*

Physical Review Letters, 121(6), p.062001_1 - 062001_7, 2018/08

 Percentile:100(Physics, Multidisciplinary)

Journal Articles

Search for $$Upsilon(1S,2S) to Z^{+}_{c}Z^{(prime) -}_{c}$$ and $$e^{+}e^{-} to Z^{+}_{c}Z^{(prime) -}_{c}$$ at $$sqrt{s}$$ = 10.52, 10.58, and 10.867 GeV

Jia, S.*; Tanida, Kiyoshi; Belle Collaboration*; 181 of others*

Physical Review D, 97(11), p.112004_1 - 112004_16, 2018/06

 Percentile:100(Astronomy & Astrophysics)

Journal Articles

Tetraquark mixing framework for isoscalar resonances in light mesons

Kim, H.*; Kim, K. S.*; Cheoun, M.-K.*; Oka, Makoto

Physical Review D, 97(9), p.094005_1 - 094005_17, 2018/05

 Times Cited Count:5 Percentile:17.57(Astronomy & Astrophysics)

A tetraquark mixing framework has been applied successfully to the isoscalar resonances, $$f_0(500)$$, $$f_0(980)$$, $$f_0(1370)$$ and $$f_0(1500)$$. Tetraquarks in this framework can have two spin configurations containing either spin-0 diquark or spin-1 diquark and each configuration forms a nonet in flavor space. The two spin configurations are found to mix strongly through the color-spin interactions. Their mixtures, which diagonalize the hyperfine masses, can generate the physical resonances constituting two nonets, which, in fact, coincide roughly with the experimental observation. We identify that $$f_0(500)$$, $$f_0(980)$$ are the isoscalar members in the light nonet, and $$f_0(1370)$$, $$f_0(1500)$$ are the similar members in the heavy nonet. The complication arises because the isoscalar members of each nonet are subject to an additional flavor mixing known as Okubo-Zweig-Iizuka rule. The tetraquark mixing framework including the flavor mixing is tested for the isoscalar resonances in terms of the mass splitting and the fall-apart decay modes. The mass splitting among the isoscalar resonances is found to be consistent qualitatively with their hyperfine mass splitting strongly driven by the spin configuration mixing, which suggests that the tetraquark mixing framework works. The fall-apart modes from our tetraquarks also seem to be consistent with the experimental modes. We also discuss possible existence of the spin-1 tetraquarks that can be constructed by the spin-1 diquark.

Journal Articles

Production cross sections of hyperons and charmed baryons from $$e^+e^-$$ annihilation near $$sqrt{s} = 10.52$$ GeV

Niiyama, Masayuki*; Tanida, Kiyoshi; Belle Collaboration*; 167 of others*

Physical Review D, 97(7), p.072005_1 - 072005_21, 2018/04

 Times Cited Count:4 Percentile:23.42(Astronomy & Astrophysics)

Journal Articles

Observation of $$Xi_{c}(2930)^0$$ and updated measurement of $$B^{-} to K^{-} Lambda_{c}^{+} bar{Lambda}_{c}^{-}$$ at Belle

Li, Y. B.*; Tanida, Kiyoshi; Belle Collaboration*; 178 of others*

European Physical Journal C, 78(3), p.252_1 - 252_8, 2018/03

Journal Articles

Observation of excited $$Omega_c$$ charmed baryons in $$e^+e^-$$ collisions

Yelton, J.*; Tanida, Kiyoshi; Belle Collaboration*; 177 of others*

Physical Review D, 97(5), p.051102_1 - 051102_6, 2018/03

 Times Cited Count:12 Percentile:3.72(Astronomy & Astrophysics)

Journal Articles

Study of $$K^0_S$$ pair production in single-tag two-photon collisions

Masuda, Masataka*; Tanida, Kiyoshi; Belle Collaboration*; 185 of others*

Physical Review D, 97(5), p.052003_1 - 052003_20, 2018/03

 Percentile:100(Astronomy & Astrophysics)

76 (Records 1-20 displayed on this page)