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Studies of Xð3872Þ and ψð2SÞ production in pp¯ collisions at 1.96 TeV

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Studies of Xð3872Þ and ψð2SÞ production in pp¯ collisions at 1.96 TeV. / D0 Collaboration.

In: Physical Review D, Vol. 102, No. 7, 072005, 13.10.2020.

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D0 Collaboration. / Studies of Xð3872Þ and ψð2SÞ production in pp¯ collisions at 1.96 TeV. In: Physical Review D. 2020 ; Vol. 102, No. 7.

Bibtex

@article{93b199a6da02416093a5f60e2e8777aa,
title = "Studies of X{\dh}3872{\TH} and ψ{\dh}2S{\TH} production in pp¯ collisions at 1.96 TeV",
abstract = "We present various properties of the production of the X(3872) and ψ(2S) states based on 10.4 fb-1 collected by the D0 experiment in Tevatron pp¯ collisions at s=1.96 TeV. For both states, we measure the nonprompt fraction fNP of the inclusive production rate due to decays of b-flavored hadrons. We find the fNP values systematically below those obtained at the LHC. The fNP fraction for ψ(2S) increases with transverse momentum, whereas for the X(3872) it is constant within large uncertainties, in agreement with the LHC results. The ratio of prompt to nonprompt ψ(2S) production, (1-fNP)/fNP, decreases only slightly going from the Tevatron to the LHC, but for the X(3872), this ratio decreases by a factor of about 3. We test the soft-pion signature of the X(3872) modeled as a weakly bound charm-meson pair by studying the production of the X(3872) as a function of the kinetic energy of the X(3872) and the pion in the X(3872)π center-of-mass frame. For a subsample consistent with prompt production, the results are incompatible with a strong enhancement in the production of the X(3872) at the small kinetic energy of the X(3872) and the π in the X(3872)π center-of-mass frame expected for the X+soft-pion production mechanism. For events consistent with being due to decays of b hadrons, there is no significant evidence for the soft-pion effect, but its presence at the level expected for the binding energy of 0.17 MeV and the momentum scale Λ=M(π) is not ruled out. {\textcopyright} 2020 authors.",
author = "{D0 Collaboration} and V.M. Abazov and M. Adams and T. Adams and S. Banerjee and A. Bean and S.B. Beri and I. Bertram and G. Borissov and D. Brown and K.M. Chan and G. Chen and S. Choi and G. Davies and L. Feng and H. Fox and L. Han and J.D. Hobbs and E. Johnson and M. Johnson and A.W. Jung and A. Kumar and H.S. Lee and S.W. Lee and W.M. Lee and X. Lei and D. Li and H. Li and L. Li and J.K. Lim and H. Liu and Y. Liu and S. Malik and R. Mccarthy and S.K. Park and D. Price and J. Qian and P.N. Ratoff and A. Ross and M.P. Sanders and S. Shaw and C. Wang and M.H.L.S. Wang and M.R.J. Williams and G.W. Wilson and D.R. Wood and Y. Xie and S. Yang and H. Yin and J.M. Yu and J. Zhu",
year = "2020",
month = oct,
day = "13",
doi = "10.1103/PhysRevD.102.072005",
language = "English",
volume = "102",
journal = "Physical Review D",
issn = "1550-7998",
publisher = "American Physical Society",
number = "7",

}

RIS

TY - JOUR

T1 - Studies of Xð3872Þ and ψð2SÞ production in pp¯ collisions at 1.96 TeV

AU - D0 Collaboration

AU - Abazov, V.M.

AU - Adams, M.

AU - Adams, T.

AU - Banerjee, S.

AU - Bean, A.

AU - Beri, S.B.

AU - Bertram, I.

AU - Borissov, G.

AU - Brown, D.

AU - Chan, K.M.

AU - Chen, G.

AU - Choi, S.

AU - Davies, G.

AU - Feng, L.

AU - Fox, H.

AU - Han, L.

AU - Hobbs, J.D.

AU - Johnson, E.

AU - Johnson, M.

AU - Jung, A.W.

AU - Kumar, A.

AU - Lee, H.S.

AU - Lee, S.W.

AU - Lee, W.M.

AU - Lei, X.

AU - Li, D.

AU - Li, H.

AU - Li, L.

AU - Lim, J.K.

AU - Liu, H.

AU - Liu, Y.

AU - Malik, S.

AU - Mccarthy, R.

AU - Park, S.K.

AU - Price, D.

AU - Qian, J.

AU - Ratoff, P.N.

AU - Ross, A.

AU - Sanders, M.P.

AU - Shaw, S.

AU - Wang, C.

AU - Wang, M.H.L.S.

AU - Williams, M.R.J.

AU - Wilson, G.W.

AU - Wood, D.R.

AU - Xie, Y.

AU - Yang, S.

AU - Yin, H.

AU - Yu, J.M.

AU - Zhu, J.

PY - 2020/10/13

Y1 - 2020/10/13

N2 - We present various properties of the production of the X(3872) and ψ(2S) states based on 10.4 fb-1 collected by the D0 experiment in Tevatron pp¯ collisions at s=1.96 TeV. For both states, we measure the nonprompt fraction fNP of the inclusive production rate due to decays of b-flavored hadrons. We find the fNP values systematically below those obtained at the LHC. The fNP fraction for ψ(2S) increases with transverse momentum, whereas for the X(3872) it is constant within large uncertainties, in agreement with the LHC results. The ratio of prompt to nonprompt ψ(2S) production, (1-fNP)/fNP, decreases only slightly going from the Tevatron to the LHC, but for the X(3872), this ratio decreases by a factor of about 3. We test the soft-pion signature of the X(3872) modeled as a weakly bound charm-meson pair by studying the production of the X(3872) as a function of the kinetic energy of the X(3872) and the pion in the X(3872)π center-of-mass frame. For a subsample consistent with prompt production, the results are incompatible with a strong enhancement in the production of the X(3872) at the small kinetic energy of the X(3872) and the π in the X(3872)π center-of-mass frame expected for the X+soft-pion production mechanism. For events consistent with being due to decays of b hadrons, there is no significant evidence for the soft-pion effect, but its presence at the level expected for the binding energy of 0.17 MeV and the momentum scale Λ=M(π) is not ruled out. © 2020 authors.

AB - We present various properties of the production of the X(3872) and ψ(2S) states based on 10.4 fb-1 collected by the D0 experiment in Tevatron pp¯ collisions at s=1.96 TeV. For both states, we measure the nonprompt fraction fNP of the inclusive production rate due to decays of b-flavored hadrons. We find the fNP values systematically below those obtained at the LHC. The fNP fraction for ψ(2S) increases with transverse momentum, whereas for the X(3872) it is constant within large uncertainties, in agreement with the LHC results. The ratio of prompt to nonprompt ψ(2S) production, (1-fNP)/fNP, decreases only slightly going from the Tevatron to the LHC, but for the X(3872), this ratio decreases by a factor of about 3. We test the soft-pion signature of the X(3872) modeled as a weakly bound charm-meson pair by studying the production of the X(3872) as a function of the kinetic energy of the X(3872) and the pion in the X(3872)π center-of-mass frame. For a subsample consistent with prompt production, the results are incompatible with a strong enhancement in the production of the X(3872) at the small kinetic energy of the X(3872) and the π in the X(3872)π center-of-mass frame expected for the X+soft-pion production mechanism. For events consistent with being due to decays of b hadrons, there is no significant evidence for the soft-pion effect, but its presence at the level expected for the binding energy of 0.17 MeV and the momentum scale Λ=M(π) is not ruled out. © 2020 authors.

U2 - 10.1103/PhysRevD.102.072005

DO - 10.1103/PhysRevD.102.072005

M3 - Journal article

VL - 102

JO - Physical Review D

JF - Physical Review D

SN - 1550-7998

IS - 7

M1 - 072005

ER -