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Studies of X(3872) and ψ(2S) production in $p\overline{p}$ collisions at 1.96 TeV

D0 Collaboration; Abazov, V. M.; Abbott, B.; Acharya, B. S.; Adams, M.; Adams, T.; Agnew, J. P.; Alexeev, G. D.; Alkhazov, G.; Alton, A.; Askew, A.; Atkins, S.; Augsten, K.; Aushev, V.; Aushev, Y.; Avila, C.; Badaud, F.; Bagby, L.; Baldin, B.; Bandurin, D. V.; Banerjee, S.; ... mehr

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 ffiffi $\sqrt{s}$ =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 f$_{NP}$ values systematically below those obtained at the LHC. The f$_{NP}$ 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 − f$_{NP}$)/f$_{NP}$, 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. ... mehr



Zugehörige Institution(en) am KIT Steinbuch Centre for Computing (SCC)
Publikationstyp Forschungsbericht/Preprint
Publikationsjahr 2020
Sprache Englisch
Identifikator KITopen-ID: 1000130020
Umfang 14 S.
Vorab online veröffentlicht am 13.10.2020
Nachgewiesen in arXiv
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