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| CMS-HIN-19-011 ; CERN-EP-2021-141 | ||
| Observation of $\mathrm{B^{0}_{s}}$ mesons and measurement of the $\mathrm{B^{0}_{s}}/\mathrm{B^{+}}$ yield ratio in PbPb collisions at ${\sqrt {\smash [b]{s_{_{\mathrm {NN}}}}}} = $ 5.02 TeV | ||
| CMS Collaboration | ||
| 4 September 2021 | ||
| Phys. Lett. B 829 (2022) 137062 | ||
| Abstract: The $\mathrm{B^{0}_{s}}$ and $\mathrm{B^{+}}$ production yields are measured in PbPb collisions at a center-of-mass energy per nucleon pair of 5.02 TeV. The data sample, collected with the CMS detector at the LHC, corresponds to an integrated luminosity of 1.7 nb$^{-1}$. The mesons are reconstructed in the exclusive decay channels ${\mathrm{B^{0}_{s}} \to \mathrm{J}/\psi\,\phi}$ and ${\mathrm{B^{+}} \to \mathrm{J}/\psi\,\mathrm{K^{+}}}$. The $\mathrm{B^{0}_{s}}$ meson is observed with a statistical significance in excess of five standard deviations for the first time in nucleus-nucleus collisions. The measurements are performed as functions of the transverse momentum of the B mesons and of the PbPb collision centrality. The ratio of production yields of $\mathrm{B^{0}_{s}}$ and $\mathrm{B^{+}}$ is measured and compared to theoretical models that include quark recombination effects. | ||
| Links: e-print arXiv:2109.01908 [hep-ex] (PDF) ; CDS record ; inSPIRE record ; HepData record ; CADI line (restricted) ; | ||
| Figures | |
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Figure 1:
Invariant mass distributions of $\mathrm{B^{+}}$ (left) and $\mathrm{B^{0}_{s}}$ (right) candidates, for event centrality in the range 0-90%. The lower panels show the pulls, obtained as the difference between the data points and the fit result, divided by the uncertainty in data. |
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Figure 1-a:
Invariant mass distribution of $\mathrm{B^{+}}$ candidates, for event centrality in the range 0-90%. The lower panel shows the pulls, obtained as the difference between the data points and the fit result, divided by the uncertainty in data. |
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Figure 1-b:
Invariant mass distribution of $\mathrm{B^{0}_{s}}$ candidates, for event centrality in the range 0-90%. The lower panel shows the pulls, obtained as the difference between the data points and the fit result, divided by the uncertainty in data. |
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Figure 2:
The acceptance- and efficiency-corrected yields for the $\mathrm{B^{+}}$ and $\mathrm{B^{0}_{s}}$ mesons, scaled by ${T_{\mathrm {AA}}}$ and ${N_{\text {MB}}}$ in PbPb collisions at $ {\sqrt {\smash [b]{s_{_{\mathrm {NN}}}}}} = $ 5.02 TeV. The results are shown as a function of the meson ${p_{\mathrm {T}}}$ (left), and of the event centrality (right), where the rightmost panel indicates the centrality-integrated result. The vertical bars (boxes) correspond to statistical (systematic) uncertainties. The global systematic uncertainty comprises the uncertainties in ${T_{\mathrm {AA}}}$, ${N_{\text {MB}}}$, $\mathcal {B}$ (left) and $\mathcal {B}$ (right). |
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Figure 2-a:
The ratio of $\mathrm{B^{0}_{s}}$ and $\mathrm{B^{+}}$ meson production yields, as a function of ${p_{\mathrm {T}}}$. The vertical bars (boxes) correspond to statistical (systematic) uncertainties. The global systematic uncertainty on the yields ratio corresponds to the decay branching fractions $\mathcal {B}$. Predictions from the TAMU transport model [23] and a Langevin hydrodynamics model [68] are overlaid. The yield ratio measured by LHCb in pp collisions at 7 TeV [69], scaled by the branching fraction ratio [57], is also displayed. |
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Figure 2-b:
The ratio of $\mathrm{B^{0}_{s}}$ and $\mathrm{B^{+}}$ meson production yields, as a function of ${p_{\mathrm {T}}}$. collision centrality. The vertical bars (boxes) correspond to statistical (systematic) uncertainties. The global systematic uncertainty on the yields ratio corresponds to the decay branching fractions $\mathcal {B}$. Predictions from a Langevin hydrodynamics model [68] are overlaid. The yield ratio measured by LHCb in pp collisions at 7 TeV [69], scaled by the branching fraction ratio [57], is also displayed. |
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Figure 3:
The ratio of $\mathrm{B^{0}_{s}}$ and $\mathrm{B^{+}}$ meson production yields, as a function of ${p_{\mathrm {T}}}$ (left) and a function of collision centrality (right). The vertical bars (boxes) correspond to statistical (systematic) uncertainties. The global systematic uncertainty on the yields ratio corresponds to the decay branching fractions $\mathcal {B}$. Predictions from the TAMU transport model [23] (left panel only) and a Langevin hydrodynamics model [68] are overlaid. The yield ratio measured by LHCb in pp collisions at 7 TeV [69], scaled by the branching fraction ratio [57], is also displayed. |
png pdf |
Figure 3-a:
The ratio of $\mathrm{B^{0}_{s}}$ and $\mathrm{B^{+}}$ meson production yields, as a function of ${p_{\mathrm {T}}}$ (left) and a function of collision centrality (right). The vertical bars (boxes) correspond to statistical (systematic) uncertainties. The global systematic uncertainty on the yields ratio corresponds to the decay branching fractions $\mathcal {B}$. Predictions from the TAMU transport model [23] (left panel only) and a Langevin hydrodynamics model [68] are overlaid. The yield ratio measured by LHCb in pp collisions at 7 TeV [69], scaled by the branching fraction ratio [57], is also displayed. |
png pdf |
Figure 3-b:
The ratio of $\mathrm{B^{0}_{s}}$ and $\mathrm{B^{+}}$ meson production yields, as a function of ${p_{\mathrm {T}}}$ (left) and a function of collision centrality (right). The vertical bars (boxes) correspond to statistical (systematic) uncertainties. The global systematic uncertainty on the yields ratio corresponds to the decay branching fractions $\mathcal {B}$. Predictions from the TAMU transport model [23] (left panel only) and a Langevin hydrodynamics model [68] are overlaid. The yield ratio measured by LHCb in pp collisions at 7 TeV [69], scaled by the branching fraction ratio [57], is also displayed. |
| Tables | |
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Table 1:
Summary of systematic uncertainties in the production yield measurements for $\mathrm{B^{+}}$ and $\mathrm{B^{0}_{s}}$ mesons, in three centrality ranges. The measurements are performed in the $\mathrm{B}$ meson kinematic region given by 10 $ < {p_{\mathrm {T}}} < $ 50 GeV/$c$ and $ {| y |} < $ 2.4. The relative uncertainty values are shown, in percentage. |
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Table 2:
Summary of systematic uncertainties in the ${T_{\mathrm {AA}}} $-scaled yield measurements for $\mathrm{B^{+}}$ and $\mathrm{B^{0}_{s}}$ mesons, in three centrality ranges. The measurements are performed in the $\mathrm{B}$ meson kinematic region given by 10 $ < {p_{\mathrm {T}}} < $ 50 GeV/$c$ and $ {| y |} < $ 2.4. The relative uncertainty values are shown in percentage. |
| Summary |
| The $\mathrm{B^{0}_{s}}$ and $\mathrm{B^{+}}$ mesons are studied with the CMS detector at the LHC via the reconstruction of the exclusive hadronic decay channels ${\mathrm{B^{0}_{s}} \to \mathrm{J}/\psi\,\phi}$ and ${\mathrm{B^{+}} \to \mathrm{J}/\psi\,\mathrm{K^{+}}}$. The measurements are performed within the $\mathrm{B}$ mesons' fiducial region given by transverse momentum ${p_{\mathrm{T}}} > $ 10 GeV/$c$ for rapidity $ |y| < $ 1.5 and 7 $ < {p_{\mathrm{T}}} < $ 50 GeV/$c$ for 1.5 $ < |y| < $ 2.4. The first observation of the $\mathrm{B^{0}_{s}}$ meson in nucleus-nucleus collisions, with a statistical significance well surpassing five standard deviations, is attained. The production yields of $\mathrm{B^{0}_{s}}$ and $\mathrm{B^{+}}$ mesons, scaled by the nuclear overlap function ${T_{\mathrm{AA}}}$ and the number of minimum bias events ${N_{\text{MB}}}$, in lead-lead (PbPb) collisions at a center-of-mass energy of 5.02 TeV per nucleon pair are presented as functions of the meson ${p_{\mathrm{T}}}$ and, for the first time, of the event centrality. These results extend, and are compatible with, those previously reported by the CMS Collaboration [25,43], and are based on a three-fold larger PbPb data sample. The ratio of production yields of the two mesons in PbPb collisions is determined and it is found to be statistically compatible with the corresponding ratio in proton-proton (pp) collisions. The further investigation of possible hints of an enhancement of the ratio in PbPb, relative to pp collisions, will benefit from more precise PbPb and pp reference data taken at the same collision energy per nucleon. The larger PbPb data sets that should be accumulated in upcoming high-luminosity LHC heavy ion runs will provide greater precision and could help to further characterize the mechanisms of beauty hadronization in heavy ion collisions. |
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