On the structure of the ππ invariant mass spectra of the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si1.gif" overflow="scroll"><mml:mi>ϒ</mml:mi><mml:mo stretchy="false">(</mml:mo><mml:mn>4</mml:mn><mml:mi>S</mml:mi><mml:mo stretchy="false">)</mml:mo><mml:mo>→</mml:mo><mml:mi>ϒ</mml:mi><mml:mo stretchy="false">(</mml:mo><mml:mn>1</mml:mn><mml:mi>S</mml:mi><mml:mo>,</mml:mo><mml:mn>2</mml:mn><mml:mi>S</mml:mi><mml:mo stretchy="false">)</mml:mo><mml:msup><mml:mi>π</mml:mi><mml:mo>+</mml

Guo, Feng-Kun; Shen, Peng-Nian; Chiang, H. C.; Ping, Rong-Gang

doi:10.1016/j.physletb.2007.10.021

Cited by 12 publications

(3 citation statements)

References 30 publications

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“…Numerically, it is of similar size as or even smaller than the two-loop diagram given in Eq. (14). Hence, the two-loop diagram could be more important than the one-loop diagrams.…”

Section: Power Counting Of Two-loop Diagramsmentioning

confidence: 99%

“…It was shown that by including the mentioned hypothetical exotic state as well as the ππ final state interaction, one can describe all the data of the Υ (nS) → Υ (mS)ππ (n > m, n = 2, 3) transitions well [12,13]. Later on, it was shown that the double-bump structure of the dipion invariant mass spectra of the transitions Υ (4S) → Υ (1S, 2S)ππ can also be described with the same exotic particle [14]. However, in all these analyses only one state was included, while the Belle Collaboration reported two Z b states.…”

Section: Introductionmentioning

confidence: 99%

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Bound state nature of the exotic Zb states

et al. 2011

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Abstract. The assumption that the newly observed charged bottomonia states Z b (10610) and Z b (10650) are of molecular nature is confronted with the measured invariant mass distributions for the transitions of the Υ (5S) to the final statesIt is shown that the assumption that the Z b (10610) and Z b (10650) are BB * + c.c. and B * B * bound states, respectively, with very small binding energies is consistent with the data. The calculation is based on a power counting for bottom meson loops, which is explicitly given up to two-loop in the framework of a nonrelativistic effective field theory. We also show that if the Z b states are of molecular nature, then the data should not be analyzed by using a Breit-Wigner parametrization.PACS. 14.40.Rt Exotic mesons -13.25.Gv Decays of J/ψ, Υ , and other quarkonia

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“…Numerically, it is of similar size as or even smaller than the two-loop diagram given in Eq. (14). Hence, the two-loop diagram could be more important than the one-loop diagrams.…”

Section: Power Counting Of Two-loop Diagramsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Bound state nature of the exotic Zb states

et al. 2011

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“…3 left), without knowing much about the Z b ϒ (nS)π couplings. Nevertheless, we expect that the ππ invariant mass distribution has a nontrivial structure at around 1 GeV, which turns out to be a dip in all our fits, due to the presence of the f 0 (980) in the coupled-channel (ππ and KK) system, as already noticed in [18]. Such a nontrivial structure was not present in either the BaBar [16] or old Belle data [17].…”

mentioning

confidence: 49%

Effects of $Z_b$ states in $\Upsilon(3S, 4S)$ dipion transitions

Chen¹,

Hanhart²,

Zou³

et al. 2018

Proceedings of XVII International Conference on Hadron Spectroscopy and Structure — PoS(Hadron2017)

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We analyze the effects of the Z b states in the dipion transitions from the ϒ (3S, 4S) to the lower ϒ states. It is found that the Z b 's, together with the properly treated ππ final-state interaction, are essential to reproduce the double-bump structure in the dipion invariant mass distribution of the ϒ (3S) → ϒ (1S)ππ transitions. We also point out that a reliable extraction of the Z b ϒ (nS)π coupling constants is crucial to finally settle the Z b contributions to these transitions. XVII International Conference on Hadron Spectroscopy and Structure -Hadron2017

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Search for B c (ns) via the B c (ns) → B c (ms) π + π − transition at LHCb and Z 0 factory

2010

Sci. China Phys. Mech. Astron.

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It is interesting to study the characteristics of the whole family of B c which contains two different heavy flavors. LHC and the proposed Z 0 factory provide an opportunity because a large database of the B c family will be achieved. B c and its excited states can be identified via their decay modes. As suggested by experimentalists, B * c (ns) → B c + γ is not easy to be clearly measured, instead, the trajectories of π + and π − occurring in the decay of B c (ns) → B c (ms) + π + π − ( n > m ) can be unambiguously identified, thus the measurement seems easier and more reliable; therefore this mode is more favorable at the early running stage of LHCb and the proposed Z 0 factory. In this work, we calculate the rate of B c (ns) → B c (ms) + π + π − in terms of the QCD multipole-expansion and the numerical results indicate that the experimental measurements with the luminosity of LHC and Z 0 factory are feasible. meson, hadronic decay, QCD multipole-expansion 12.38.Bx

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On the structure of the ππ invariant mass spectra of the ϒ(4S)→ϒ(1S,2S)π+

Cited by 12 publications

References 30 publications

Bound state nature of the exotic Zb states

Bound state nature of the exotic Zb states

Effects of $Z_b$ states in $\Upsilon(3S, 4S)$ dipion transitions

Search for B c (ns) via the B c (ns) → B c (ms) π + π − transition at LHCb and Z 0 factory

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