Measurement of differential $b\bar{b}$- and $c\bar{c}$-dijet cross-sections in the forward region of $pp$ collisions at $\sqrt{s}=13 ~ \mathrm{TeV}$

The LHCb collaboration
JHEP 02 (2021) 023, 2021.

Abstract
The inclusive $b \bar{b}$- and $c \bar{c}$-dijet production cross-sections in the forward region of $pp$ collisions are measured using a data sample collected with the LHCb detector at a centre-of-mass energy of 13 TeV in 2016. The data sample corresponds to an integrated luminosity of 1.6 fb$^{-1}$. Differential cross-sections are measured as a function of the transverse momentum and of the pseudorapidity of the leading jet, of the rapidity difference between the jets, and of the dijet invariant mass. A fiducial region for the measurement is defined by requiring that the two jets originating from the two $b$ or $c$ quarks are emitted with transverse momentum greater than 20 GeV$/c$, pseudorapidity in the range $2.2 < \eta < 4.2$, and with a difference in the azimuthal angle between the two jets greater than 1.5. The integrated $b \bar{b}$-dijet cross-section is measured to be $53.0 \pm 9.7$ nb, and the total $c \bar{c}$-dijet cross-section is measured to be $73 \pm 16$ nb. The ratio between $c \bar{c}$- and $b \bar{b}$-dijet cross-sections is also measured and found to be $1.37 \pm 0.27$. The results are in agreement with theoretical predictions at next-to-leading order.

  • Table 3

    10.17182/hepdata.110430.v1/t1

    The total $b \bar{b}$-dijet and $c \bar{c}$-dijet cross-sections and their ratio in the fiducial region, compared with the NLO predictions....

  • Table 4

    10.17182/hepdata.110430.v1/t2

    Numerical results of $b \bar{b}$- and $c \bar{c}$-dijet cross-sections, $c \bar{c}$/$b \bar{b}$ dijet cross-section ratios and their total uncertainties as...

  • Table 5

    10.17182/hepdata.110430.v1/t3

    Numerical results of $b \bar{b}$- and $c \bar{c}$-dijet cross-sections, $c \bar{c}$/$b \bar{b}$ dijet cross-section ratios and their total uncertainties as...

  • Table 6

    10.17182/hepdata.110430.v1/t4

    Numerical results of $b \bar{b}$- and $c \bar{c}$-dijet cross-sections, $c \bar{c}$/$b \bar{b}$ dijet cross-section ratios and their total uncertainties as...

  • Table 7

    10.17182/hepdata.110430.v1/t5

    Numerical results of $b \bar{b}$- and $c \bar{c}$-dijet cross-sections, $c\bar{c}$/$b \bar{b}$ dijet cross-section ratios and their total uncertainties as a...

  • Table 8

    10.17182/hepdata.110430.v1/t6

    Covariance matrix, corresponding to the total uncertainties, obtained between the leading jet eta intervals of the $b \bar{b}$-dijet differential cross...

  • Table 9

    10.17182/hepdata.110430.v1/t7

    Covariance matrix, corresponding to the total uncertainties, obtained between the leading jet eta intervals of the $c \bar{c}$-dijet differential cross...

  • Table 10

    10.17182/hepdata.110430.v1/t8

    Covariance matrix, corresponding to the total uncertainties, obtained between the leading jet $\eta$ intervals of the $b \bar{b}$ (horizontal) and...

  • Table 11

    10.17182/hepdata.110430.v1/t9

    Covariance matrix, corresponding to the total uncertainties, obtained between the $\Delta y^*$ intervals of the $b \bar{b}$-dijet differential cross sections....

  • Table 12

    10.17182/hepdata.110430.v1/t10

    Covariance matrix, corresponding to the total uncertainties, obtained between the $\Delta y^*$ intervals of the $c \bar{c}$-dijet differential cross sections....

  • Table 13

    10.17182/hepdata.110430.v1/t11

    Covariance matrix, corresponding to the total uncertainties, obtained between the $\Delta y^*$ intervals of the $b \bar{b}$ (horizontal) and $c...

  • Table 14

    10.17182/hepdata.110430.v1/t12

    Covariance matrix, corresponding to the total uncertainties, obtained between the leading jet $p_T$ intervals of the $b \bar{b}$-dijet differential cross...

  • Table 15

    10.17182/hepdata.110430.v1/t13

    Covariance matrix, corresponding to the total uncertainties, obtained between the leading jet $p_T$ intervals of the $c \bar{c}$-dijet differential cross...

  • Table 16

    10.17182/hepdata.110430.v1/t14

    Covariance matrix, corresponding to the total uncertainties, obtained between the leading jet $p_T$ intervals of the $b \bar{b}$ (horizontal) and...

  • Table 17

    10.17182/hepdata.110430.v1/t15

    Covariance matrix, corresponding to the total uncertainties, obtained between the $m_{jj}$ intervals of the $b \bar{b}$-dijet differential cross sections. The...

  • Table 18

    10.17182/hepdata.110430.v1/t16

    Covariance matrix, corresponding to the total uncertainties, obtained between the $m_{jj}$ intervals of the $c \bar{c}$-dijet differential cross sections. The...

  • Table 19

    10.17182/hepdata.110430.v1/t17

    Covariance matrix, corresponding to the total uncertainties, obtained between the $m_{jj}$ intervals of the $b \bar{b}$ (horizontal) and $c \bar{c}$...

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