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| CMS-HIN-16-011 ; CERN-EP-2017-076 | ||
| Measurement of $\mathrm{B}^{\pm}$ mesons differential production cross sections in pp and PbPb collisions at ${\sqrt{{s_{_{\mathrm{NN}}}}}} = $ 5.02 TeV | ||
| CMS Collaboration | ||
| 12 May 2017 | ||
| Phys. Rev. Lett. 119 (2017) 152301 | ||
| Abstract: The differential production cross sections of $\mathrm{B}^{\pm}$ mesons are measured via the exclusive decay channels ${\mathrm{B}^{\pm}\to\mathrm{J}/\psi \mathrm{K}^{\pm}\to\mu^{+}\mu^{-}\mathrm{K}^{\pm}} $ as a function of transverse momentum in pp and PbPb collisions at a center-of-mass energy ${\sqrt{{s_{_{\mathrm{NN}}}}}} = $ 5.02 TeV per nucleon pair with the CMS detector at the LHC. The pp (PbPb) dataset used for this analysis corresponds to an integrated luminosity of 28.0 pb$^{-1}$ (351 $\mu$b$^{-1}$). The measurement is performed in the $\mathrm{B}^{\pm}$ meson transverse momentum range of 7 to 50 GeV/$c$, in the rapidity interval $ | y | < $ 2.4. In this kinematic range, a strong suppression of the production cross section by about a factor of two is observed in the PbPb system in comparison to the expectation from pp reference data. These results are compared to theoretical calculations incorporating beauty quark diffusion and energy loss in a quark-gluon plasma. | ||
| Links: e-print arXiv:1705.04727 [hep-ex] (PDF) ; CDS record ; inSPIRE record ; HepData record ; CADI line (restricted) ; | ||
| Figures | Summary | Additional Figures | References | CMS Publications |
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| Figures | |
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Figure 1:
Invariant mass distributions of $\mathrm{B}^{+} $ and $\mathrm{B}^{-} $ candidates in pp (left) and PbPb (right) collisions measured in $ {| y | } < $ 2.4 and in the ${p_{\mathrm {T}}}$ region 10$^{-15}$ GeV/$c$. |
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Figure 1-a:
Invariant mass distributions of $\mathrm{B}^{+} $ and $\mathrm{B}^{-} $ candidates in pp collisions measured in $ {| y | } < $ 2.4 and in the ${p_{\mathrm {T}}}$ region 10$^{-15}$ GeV/$c$. |
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Figure 1-b:
Invariant mass distributions of $\mathrm{B}^{+} $ and $\mathrm{B}^{-} $ candidates in PbPb collisions measured in $ {| y | } < $ 2.4 and in the ${p_{\mathrm {T}}}$ region 10$^{-15}$ GeV/$c$. |
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Figure 2:
The $ {p_{\mathrm {T}}} $-differential production cross section of $\mathrm{B}^{\pm} $ in pp (left) and PbPb (right) collisions at $ {\sqrt {s}} = $ 5.02 TeV. The vertical bars (boxes) correspond to statistical (systematic) uncertainties. The systematic uncertainty boxes here include both the correlated and uncorrelated contributions added in quadrature. The global systematic uncertainty, listed in the legend and not included in the point-to-point uncertainties. For the pp cross section, they comprise the uncertainties in the integrated luminosity measurement and in the branching fraction B. For the PbPb cross section, they comprise the uncertainties in ${T_{\mathrm {AA}}} $, $N_{\text {MB}}$, and B. The pp cross section is compared to FONLL calculations [39,40,41] represented by the colored boxes with the heights indicating the theoretical uncertainty. |
png pdf |
Figure 2-a:
The $ {p_{\mathrm {T}}} $-differential production cross section of $\mathrm{B}^{\pm} $ in pp collisions at $ {\sqrt {s}} = $ 5.02 TeV. The vertical bars (boxes) correspond to statistical (systematic) uncertainties. The systematic uncertainty boxes here include both the correlated and uncorrelated contributions added in quadrature. The global systematic uncertainty, listed in the legend and not included in the point-to-point uncertainties. For the pp cross section, they comprise the uncertainties in the integrated luminosity measurement and in the branching fraction B. For the PbPb cross section, they comprise the uncertainties in ${T_{\mathrm {AA}}} $, $N_{\text {MB}}$, and B. The pp cross section is compared to FONLL calculations [39,40,41] represented by the colored boxes with the heights indicating the theoretical uncertainty. |
png pdf |
Figure 2-b:
The $ {p_{\mathrm {T}}} $-differential production cross section of $\mathrm{B}^{\pm} $ in PbPb collisions at $ {\sqrt {s}} = $ 5.02 TeV. The vertical bars (boxes) correspond to statistical (systematic) uncertainties. The systematic uncertainty boxes here include both the correlated and uncorrelated contributions added in quadrature. The global systematic uncertainty, listed in the legend and not included in the point-to-point uncertainties. For the pp cross section, they comprise the uncertainties in the integrated luminosity measurement and in the branching fraction B. For the PbPb cross section, they comprise the uncertainties in ${T_{\mathrm {AA}}} $, $N_{\text {MB}}$, and B. The pp cross section is compared to FONLL calculations [39,40,41] represented by the colored boxes with the heights indicating the theoretical uncertainty. |
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Figure 3:
The ${p_{\mathrm {T}}}$ dependence of the nuclear modification factor ${R_{\mathrm {AA}}}$ of $\mathrm{B}^{\pm} $ measured in PbPb collisions at $ {\sqrt {{s_{_{\mathrm {NN}}}}}} = $ 5.02 TeV. The vertical bars (boxes) correspond to statistical (systematic) uncertainties. The global systematic uncertainty, represented as a grey box at $ {R_{\mathrm {AA}}} = $ 1, comprises the uncertainties in the integrated luminosity measurement and ${T_{\mathrm {AA}}}$ value. Four theoretical calculations are also shown for comparison (TAMU [43,44], Djordjevic [45], CUJET3.0 [46,47,48], AdS/CFT HH [49,50]). The line width of the theoretical calculation from Ref. [43,44] represents the size of its statistical uncertainty. |
| Summary |
| In summary, the first measurement of the differential production cross sections of $\mathrm{B}^{\pm}$ mesons in pp and PbPb collisions at ${\sqrt{{s_{_{\mathrm{NN}}}}}} = $ 5.02 TeV has been presented. The mesons are measured with the CMS detector at the LHC in rapidity $ | y | < $ 2.4 and transverse momentum 7 $ < {p_{\mathrm {T}}} < $ 50 GeV/$c$ via the reconstruction of one of their exclusive hadronic decay channels, ${\mathrm{B}^{\pm}\to\mathrm{J}/\psi \mathrm{K}^{\pm}\to\mu^{+}\mu^{-}\mathrm{K}^{\pm}} $. The nuclear modification factor of $\mathrm{B}^{\pm}$ is measured as a function of its $ {p_{\mathrm {T}}} $. A strong suppression by about a factor of two is observed in the PbPb system in comparison to expectations from the scaled pp reference data. These measurements provide constraints on phenomenological models which aim to describe the flavor dependence of the in-medium parton energy loss. |
| Additional Figures | |
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Additional Figure 1:
The ${p_{\mathrm {T}}}$ dependence of the nuclear modification factor of $\mathrm{B^{\pm}} $ measured in collisions at $ = $ 5.02 TeV. The vertical bars (boxes) correspond to statistical (systematic) uncertainties. The global systematic uncertainty, represented as a grey box at $=$ 1, comprises the uncertainties in the integrated luminosity measurement and value. Five theoretical calculations are also shown for comparison. |
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