Observation of structure in

pp annihilation into two pions and three pions is studied in a baryon-exchange model. Annihilation diagrams involving nucleon as well as ∆-resonance exchanges are included consistently in the two-and three-pion channels. Effects from the initial-state interaction are fully taken into account. A comparison of the influence of the ∆ exchange on the considered annihilation channels is made and reveals that its importance for three-pion annihilation is strongly reduced as compared to two-pion annihilation. It is found that annihilation into three uncorrelated pions can yield up to 10% of the total experimentally observed three-pion annihilation cross section.PACS number(s): 13.75.

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“…These data show a systematic disagreement in normalization with the earlier data[33], i.e. the cross sections are a factor of more than 2 larger.…”

contrasting

confidence: 73%

“…Some experimental results for pp annihilation into neutral pions have been published already a long time ago [33]. But only very recently, for the first time, data at beam momenta below 1 GeV/c have been made available by the Crystal Barrel Collaboration for annihilation into 2π 0 's [34,35].…”

Section: Annihilation Into Neutral Pionsmentioning

confidence: 99%

Role of Δ exchange for p annihilation into two-pion and three-pion channels

2002

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“…Some observed channels and branching ratios are listed in Table I. CNTR [41] first reported the resonance f 4 (2300); in the past decades, it has appeared in the reactions, p p → K + K − [42], ππ [17,18,43], ηπ 0 π 0 [8], and…”

Section: B States With J =mentioning

confidence: 99%

“…CNTR [41] first reported the resonance f 4 (2300). In the past decades, it appears in the reactions, pp → K + K − [42], ππ [22,23,43], ηπ 0 π 0 [2], and…”

Section: B States Withmentioning

confidence: 99%

High-spin mesons below 3 GeV

et al. 2015

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In this work, we study the high-spin states with mass below 3 GeV observed in experiments and the analysis of mass spectrum and investigation of strong decay behaviors of the high-spin states are performed. Comparing our results with the experimental data, we can reveal the underlying properties of these high-spin states. What is more important is that in this work we also predict their abundant decay features, which can provide valuable information to further experimental exploration of these high-spin states.

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“…For the reason of decreasing the fitting parameters, we do not consider the f 2 (2010) state, which is a candidate of an F-wave state and this high partial wave contribution is assumed to be suppressed. Additionally, we also notice that these f 2 states have been experimentally observed in low energy p p collisions [52][53][54][55][56]. Thus, this indicates that it should be reasonably enough to attribute several suspected signals seen in the measured p p invariant mass spectrum of B s → J/ψp p [1] to the resonance contributions from the f 2 mesons around 2.0 GeV.…”

Section: Figmentioning

confidence: 63%

Evidence supporting the existence of $P_c(4380)^{\pm}$ from the recent measurements of $B_s \to J/ψp\bar{p}$

Wang,

Liu,

Matsuki

2021

Preprint

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Very recently, the LHCb Collaboration released the newest measurements of B s → J/ψp p, where an enhancement structure near 4.34 GeV was observed in the invariant mass spectrum of J/ψp with the statistical significance of 3.1 ∼ 3.7 σ. In this work, by performing a combined analysis for the three invariant mass spectra of B s → J/ψp p, we find that this J/ψp structure near 4.34 GeV can correspond to the contributions from the P c (4380) + state with the assumption of J P = 3/2 − together with the reflections of B s → ( f * 2 → p p)J/ψ. Here, P c (4380) was first observed in Λ b → J/ψpK but not confirmed in the updated LHCb data in 2019, and f * 2 means the exciting light isoscalar tensor meson around 2.0 GeV. Thus, this provides a possible evidence to support the existence of the pentaquark P c (4380). Specifically, the assumed spin-parity J P = 3/2 − of P c (4380) is consistent with a prediction of the theoretical explanation of an S -wave DΣ * c molecular bound state.

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Observation of structure in

Cited by 38 publications

References 20 publications

Role of Δ exchange for p annihilation into two-pion and three-pion channels

Role of Δ exchange for p annihilation into two-pion and three-pion channels

High-spin mesons below 3 GeV

Evidence supporting the existence of $P_c(4380)^{\pm}$ from the recent measurements of $B_s \to J/ψp\bar{p}$

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