Production of the bottom analogs and the spin partner of the X(3872) at hadron colliders

Abstract

Using the Monte Carlo event generator tools Pythia and Herwig, we simulate the production of bottom/charm meson and antimeson pairs at hadron colliders in proton-proton/antiproton collisions. With these results, we derive an order-of-magnitude estimate for the production rates of the bottom analogs and the spin partner of the X (3872) as hadronic molecules at the LHC and Tevatron experiments. We find that the cross sections for these processes are at the nb level, so that the current and future data sets from the Tevatron and LHC experiments offer a significant discovery potential. We further point out that the X b / X b2 should be reconstructed in the γ ϒ(nS)(n = 1, 2, 3), ϒ(1S)π + π − π 0 , or χ bJ π + π − instead of the ϒ(nS)π + π − final states.

The hidden-charm pentaquark and tetraquark states

“…The analogous states of the X(3872), such as X b involving b quarks, were investigated in Refs. [653,654,655,656,657,658,659,660,661,662,663]. 4.5.5.2.…”

“…The results of Ref. [658] were obtained using Herwig and Pythia, which are written outside and inside brackets, respectively. σ(pp/pp → X(3872)) Experiment Ref.…”

“…[658] with Λ = 0.5 GeV with Λ = 1 GeV (7) 72 (32) In Ref. [658], Guo, Meissner, Wang, and Yang used the Monte Carlo event generator tools Pythia and Herwig to simulate the production of bottom/charm meson and antimeson pairs at hadron colliders in proton-proton/antiproton collisions, and then derived an order-of-magnitude estimate for the production cross sections of the X(3872) as a DD * molecular state at the LHC and Tevatron experiments. Their results are consistent with the experimental measurement by the CDF [712] and CMS [73] collaborations, which are shown in Table 26 together with the predictions of Refs.…”

Decay widths of the spin-2 partners of the X(3872)

“…3 The production of these states in hadron colliders and electron-positron collisions has been studied in Refs. [31,32]. In this work, we will investigate the dominant decay modes of the spin-2 partners of the X (3872), i.e.…”

Recent results on XYZ States at Belle

“…Except the clear Υ(2S ) signal, no evidence for an X b signal was observed. However, unlike the X(3872), whose decays exhibit large 060002-2 isospin violation, the X b would decay preferably into π + π − π 0 Υ(1S ) rather than π + π − Υ(1S ) if it exists [16,19]. So Belle did a search for an X b signal decaying to ωΥ(1S ) in e + e − → γX b at a CM energy of 10.867 GeV [20].…”