\begin{document}$X(3872)$ \end{document} relies on observing its decay products, which are measured with a finite experimental mass resolution that is typically \begin{document}$\Delta m \geqslant 2 $ \end{document} MeV , and much larger than its alleged binding energy, \begin{document}$B_X=0.00\,(18)$ \end{document} MeV. On the other hand, we have found recently that there is a clear cancellation in the \begin{document}$1^{++}$ \end{document} channel of the invariant \begin{document}$D {\bar D}^*$ \end{document} mass around the threshold between continuum and the bound state. This is very much like a similar cancellation in the proton-neutron continuum with the deuteron in the \begin{document}$1^{++}$ \end{document} channel. Based on comparative fits with a common Tsallis distribution of the experimental cross-sections for prompt production of deuterons and \begin{document}$X(3872)$ \end{document} in pp collisions with a finite \begin{document}$p_T$ \end{document}, we find a strong argument for questioning the bound state nature of this state, which also suggests that the large observed production rate could be consistent with a half-bound state."> Is <i>X</i>(3872) a bound state? -
  • [1]

    S. Nussinov and D. P. Sidhu, Nuovo Cim. A,44: 230 (1978)

  • [2]

    Particle Data Group, M. Tanabashi et al, Phys. Rev. D,98: 030001 (2018)

  • [3]

    A. Esposito, A. Pilloni, and A. D. Polosa, Phys. Rept.,668: 1 (2016), arXiv:1611.07920

  • [4]

    F. K. Guo et al, Rev. Mod. Phys.,90: 015004 (2018), arXiv:1705.00141

  • [5]

    Belle, S. K. Choi et al, Phys. Rev. Lett.,91: 262001 (2003), arXiv:hepex/0309032

  • [6]

    BaBar, B. Aubert et al, Phys. Rev. D,71: 031501 (2005), arXiv:hep-ex/0412051

  • [7]

    S. K. Choi et al, Phys. Rev. D,84: 052004 (2011), arXiv:1107.0163

  • [8]

    LH Cb, R. Aaij et al, Phys. Rev. Lett.,110: 222001 (2013), arXiv:1302.6269

  • [9]

    M. Karliner, J. L. Rosner, and T. Skwarnicki, (2017), arXiv: 1711.10626

  • [10]

    X. W. Kang and J. A. Oller, Eur. Phys. J. C,77: 399 (2017), arXiv:1612.08420

  • [11]

    F. K. Guo, Phys. Rev. Lett.,122: 202002 (2019), arXiv:1902.11221

  • [12]

    P. G. Ortega, D. R. Entem, F. Fernández et al, Phys. Lett. B,781: 678 (2018), arXiv:1707.01915

  • [13]

    P. G. Ortega and E. Ruiz Arriola, PoS Hadron,2017: 236 (2018), arXiv:1711.10193

  • [14]

    N. A. Tornqvist, Z. Phys. C,61: 525 (1994), arXiv:hep-ph/9310247

  • [15]

    F.E. Close and P.R. Page, Phys. Lett. B,578: 119 (2004), arXiv:hep-ph/0309253

  • [16]

    E. Braaten and M. Kusunoki, Phys. Rev. D,69: 074005 (2004), arXiv:hepph/0311147

  • [17]

    P. Braun-Munzinger and B. Dönigus, Nucl. Phys. A,987(144): (2019)

  • [18]

    Y. Cai et al, (2019), arXiv: 1905.02753

  • [19]

    R. F. Dashen and G. L. Kane, Phys. Rev. D,11: 136 (1975)

  • [20]

    G. Parisi,Statistical Field Theory, (REDWOOD CITY, USA: ADDISON-WESLEY, 1988, p.352, FRONTIERS IN PHYSICS, 66)

  • [21]

    K. Huang, Introduction to statistical physics, Chapman and Hall/CRC (2009)

  • [22]

    E. Ruiz Arriola, L.L. Salcedo, and E. Megias, Acta Phys. Polon. Supp.,8: 439 (2015), arXiv:hep-ph/1505.02922

  • [23]

    E. Ruiz Arriola, L. L. Salcedo, and E. Megias, Acta Phys. Polon. B,45: 2407 (2014), arXiv:hep-ph/1410.3869

  • [24]

    R. F. Dashen, J. B. Healy, and I. J. Muzinich, Phys. Rev. D,14: 2773 (1976)

  • [25]

    R. Navarro Prez, J.E. Amaro, and E. Ruiz Arriola, Phys. Rev. C,88: 064002 (2013), arXiv: 1310.2536, [Erratum: Phys. Rev. C, 91, no.2, 029901(2015)]

  • [26]

    D. Gamermann, J. Nieves, E. Ruiz Arriola et al, Phys. Rev. D,81: 014029 (2010), arXiv:hep-ph/0911.4407

  • [27]

    E. Ruiz Arriola, S. Szpigel, and V.S. Timoteo, Phys. Lett. B,728: 596 (2014), arXiv:nucl-th/1307.1231

  • [28]

    P. G. Ortega et al., Phys. Rev. D,81: 054023 (2010), arXiv:hep-ph/0907.3997

  • [29]

    C. J. Horowitz and A. Schwenk, Nucl. Phys. A,776: 55 (2006)

  • [30]

    A. Andronic et al, Nature,561: 321 (2018), arXiv:1710.09425

  • [31]

    D.W. Sivers, S.J. Brodsky, and R. Blankenbecler, Phys. Rept.,23: 1 (1976)

  • [32]

    J. Rak and M.J. Tannenbaum,High pT physics in the heavy ion era(Cambridge University Press, Vol. 34, 2013)

  • [33]

    R.P. Feynman, R.D. Field, and G.C. Fox, Phys. Rev. D,18: 3320 (1978), [739(1978)]

  • [34]

    R. Hagedorn, Riv. Nuovo Cim. 6N10 1 (1983)

  • [35]

    H. Feshbach, Physics Today,40: 9 (1987)

  • [36]

    C. Tsallis, Possible Generalization of Boltzmann-Gibbs Statistics, (1988)

  • [37]

    I. Bediaga, E.M.F. Curado, and J.M. de Miranda, Physica A,286: 156 (2000), arXiv:hep-ph/9905255

  • [38]

    W.M. Alberico, A. Lavagno, and P. Quarati, Eur. Phys. J. C,12: 499 (2000), arXiv:nucl-th/9902070

  • [39]

    E. Megias, D.P. Menezes and A. Deppman, Physica A,421: 15 (2015)

  • [40]

    T. Bhattacharyya et al, Eur. Phys. J. A,54: 222 (2018), arXiv:1712.08334

  • [41]

    J. Cleymans and D. Worku, Eur. Phys. J. A,48: 160 (2012), arXiv:1203.4343

  • [42]

    P. G. Ortega and E. Ruiz Arriola, Work in preparation

  • [43]

    T. Sjostrand, S. Mrenna, and P.Z. Skands, Comput. Phys. Commun.,178: 852 (2008), arXiv:0710.3820

  • [44]

    T. Sjostrand, S. Mrenna, and P.Z. Skands, JHEP,05: 026 (2006), arXiv:hepph/0603175

  • [45]

    ALICE, S. Acharya et al, Phys. Rev. C,97: 024615 (2018), arXiv:1709.08522

  • [46]

    C MS, S. Chatrchyan et al, JHEP,02: 011 (2012), arXiv:1111.1557

  • [47]

    C MS, S. Chatrchyan et al, JHEP,04: 154 (2013), arXiv:1302.3968

  • [48]

    ATLAS, M. Aaboud et al, JHEP,01: 117 (2017), arXiv:1610.09303

  • [49]

    TOTEM, G. Antchev et al, EPL,101: 21004 (2013)

  • [50]

    F. James and M. Roos, Comput. Phys. Commun.,10: 343 (1975)

  • [51]

    C. Li and C. Z. Yuan, arXiv: 1907.09149[hep-ex]

  • [52]

    Particle Data Group, C. Patrignani et al, Chin. Phys. C,40: 100001 (2016)

  • [53]

    Belle and C.Z. Yuan, in29th International Conference on Physics in Collision(PIC 2009, Kobe, Japan, August 30-September 2, 2009)

  • [54]

    Belle, Y. Kato et al, Phys. Rev. D,97: 012005 (2018), arXiv:1709.06108

  • [55]

    A. Esposito et al, Phys. Rev. D,92: 034028 (2015), arXiv:1508.00295

  • [56]

    G. A. Baker, Phys. Rev. C,60: 054311 (1999)

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