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doi:10.1103/physrevlett.102.161803

Cited by 78 publications

(134 citation statements)

References 17 publications

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“…X d because the corresponding measurement seemed very difficult. A few years ago, however, the BABAR collaboration managed to measure this branching ratio [5,6], yielding the CP-averaged result Br½ " B ! X d E >1:6 GeV ¼ ð1:41 AE 0:57Þ Â10 À5 [7,8].…”

Section: Introductionmentioning

confidence: 99%

Tree-level contribution toB¯→Xdγusing fragmentation functions

Asatrian

Greub

2013

Phys. Rev. D

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We evaluate the most important tree-level contributions connected with the b ! u " ud transition to the inclusive radiative decay " B ! X d using fragmentation functions. In this framework the singularities arising from collinear photon emission from the light quarks (u, " u, and d) can be absorbed into the (bare) quarkto-photon fragmentation function. We use as input the fragmentation function extracted by the ALEPH group from the two-jet cross section measured at the large electron positron (LEP) collider, where one of the jets is required to contain a photon. To get the quark-to-photon fragmentation function at the fragmentation scale F $ m b , we use the evolution equation, which we solve numerically. We then calculate the (integrated) photon energy spectrum for b ! u " ud related to the operators P u 1;2 . For comparison, we also give the corresponding results when using nonzero (constituent) masses for the light quarks.

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Section: Introductionmentioning

confidence: 99%

Tree-level contribution toB¯→Xdγusing fragmentation functions

Asatrian

Greub

2013

Phys. Rev. D

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“…Its total width is known to be an upper limit of 1.2 MeV at the 90% confidence level (C.L. ), and only D * 0D0 + c.c., π + π − J/ψ, ωJ/ψ, γJ/ψ, and π 0 χ c1 decay modes are observed with more than 5 standard deviation significance [10][11][12][13][14][15][16][17][18][19], and the existence of γψ(3686) decay mode is not confirmed [15,[18][19][20]. None of the above modes have measured absolute branching fractions due to the fact that the total number of X(3872) events is very hard to be determined either in B-meson decays or in e + e − annihilation experiment.…”

mentioning

confidence: 99%

Determination of the absolute branching fractions of X(3872) decays

Yuan

2019

Phys. Rev. D

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We report the first determination of the absolute branching fractions of the X(3872) decays by globally analyzing the measurements provided by the Belle, BaBar, BESIII, and LHCb experiments. The branching fractions of X(3872) → π + π − J/ψ and D * 0D0 + c.c. are found to be (4.1 +1.9 −1.1 )% and (52.4 +25.3 −14.3 )%, respectively. The branching fractions of the decays X(3872) → γJ/ψ, γψ(3686), ωJ/ψ, and π 0 χ c1 are also determined. The global fit implies that the fraction of X(3872) decays which are not observed in experiments is (31.9 +18.1 −31.5 )%, which indicates that there is still large room for searching for new decay modes of the X(3872). With the branching fraction, we determine the production cross section of e + e − → γX(3872) at center-of-mass energy 4.226 GeV. Observed in 2003 by the Belle experiment [1], the X(3872) has been the most puzzling state among all the so-called charmoniumlike XYZ states for all these years [2]. Being very close to the D * 0D0 + c.c. mass threshold, it is supposed to have a large D * 0D0 + c.c. molecule component [3], and its large production rate in pp and pp collision experiments suggests that there is a charmonium state χ c1 (2P ) core in its wave function [4][5][6][7]. * Electronic address: chunhua@lnnu.edu.cn † Electronic address: yuancz@ihep.ac.cn

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“…They concluded that the pion pairs originate from ρ 0 mesons and that the favored quantum numbers of the X(3872) are J P C = 1 ++ and 2 −+ . The radiative decays of X(3872) → γJ/ψ have been observed [78][79][80][81], which implies that the C-parity of X(3872) is positive. Finally, LHCb performed the analysis of the angular correlations in B + → X(3872)K + , X(3872) → π + π − J/ψ, J/ψ → µ + µ − decays and confirmed the eigenvalues of total spin angular momentum, parity and charge conjugation of the X(3872) state are 1 ++ [4,82].…”

Section: +04mentioning

confidence: 99%

“…where the σ mass m σ = 550 MeV is used. The factor 1/m 2 σ is multiplied because the function C(r; m σ , Λ) includes m 2 σ (see (79)). There is ambiguity in the value of the coupling constant g σ .…”

Section: Isovector P ( * )P ( * ) Molecule With Opepmentioning

confidence: 99%

Heavy hadronic molecules with pion exchange and quark core couplings: a guide for practitioners

Yamaguchi

Hosaka

Takeuchi

et al. 2020

J. Phys. G: Nucl. Part. Phys.

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We discuss selected and important features of hadronic molecules as one of promising forms of exotic hadrons near thresholds. Using examples of DD * systems such as X(3872) and Z c , emphasis is put on the roles of the one pion exchange interaction between them and their coupling to intrinsic quark states. Thus hadronic molecules emerge as admixtures of the dominant long-range hadron structure and short-range quark structure. For the pion exchange interaction, properties of the tensor force are analyzed in detail. More coupled channels supply more attractions, and heavier constituents suppress kinetic energies, providing more chances to form hadronic molecules of heavy hadrons. Throughout this article, we show details of basic ideas and methods. ‡ More complete references are given in section 4.1 for X(3872) and in section 5.1 for Z c and Z b . arXiv:1908.08790v1 [hep-ph] 23 Aug 2019 § Here D ( * ) stands for either D or D * meson. In this article we do not consider systems containing strange quarks, and therefore the notation q is used for light u, d quarks.

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Measurement ofB→XγDecays and Determination of|Vtd/Vts

Cited by 78 publications

References 17 publications

Tree-level contribution toB¯→Xdγusing fragmentation functions

Tree-level contribution toB¯→Xdγusing fragmentation functions

Determination of the absolute branching fractions of X(3872) decays

Heavy hadronic molecules with pion exchange and quark core couplings: a guide for practitioners

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