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Measurement of multijet production in $ep$ collisions at high $Q^2$ and determination of the strong coupling $\alpha _s$

The H1 collaboration
Eur.Phys.J. C75 (2015) 65, 2015

Abstract (data abstract)
DESY-HERA. Inclusive jet, dijet and trijet differential cross sections are measured in neutral current deep-inelastic scattering for exchanged boson virtualities 150 < Q**2 < 15000 GeV**2 using the H1 detector at HERA. The data were taken in the years 2003 to 2007 and correspond to an integrated luminosity of 351 pb^{-1}. Double differential jet cross sections are obtained using a regularised unfolding procedure. They are presented as a function of Q**2 and the transverse momentum of the jet, PT(JET), and as a function of Q**2 and the proton longitudinal momentum fraction, XI, carried by the parton participating in the hard interaction. In addition normalised double differential jet cross sections are measured as the ratio of the jet cross sections to the inclusive neutral current cross sections in the respective Q**2 bins of the jet measurements. In dijet and trijet cross section measurements the variables used are labelled MEAN(PT(2JET)) and XI(2), and MEAN(PT(3JET)) and XI(3), respectively. These are defined as: - MEAN(PT(2JET)) = (1/2) * ( PT(JET(1)) + PT(JET(2)) ). - MEAN(PT(3JET)) = (1/3) * ( PT(JET(1)) + PT(JET(2)) + PT(JET(3)) ). - XI(2) = X * ( 1 + (M(12)**2 / Q**2) ) where X is the Bjorken scaling variable and M(12) is the invariant mass of the two leading jets. - XI(3) = X * ( 1 + (M(123)**2 / Q**2) ) where M(123) is the invariant mass of the three leading jets. Compared to earlier work, the measurements benefit from an improved reconstruction and calibration of the hadronic final state. The cross sections are compared to perturbative QCD calculations in next-to-leading order and are used to determine the running coupling and the value of the strong coupling constant as ALPHAS(M(Z)) = 0.1165 +- 0.0008 (exp) +- 0.0038 (pdf,theo).

  • Table 1

    Data from Table 8

    10.17182/hepdata.64353.v1/t1

    Double-differential inclusive jet cross sections measured as a function of Q**2 and PT(JET) using the kT jet algorithm. The total...

  • Table 2

    Data from Table 9

    10.17182/hepdata.64353.v1/t2

    Double-differential dijet cross sections measured as a function of Q**2 and MEAN(PT(2JET)) using the kT jet algorithm. The total systematic...

  • Table 3

    Data from Table 10

    10.17182/hepdata.64353.v1/t3

    Double-differential dijet cross sections measured as a function of Q**2 and XI(2) using the kT jet algorithm. The total systematic...

  • Table 4

    Data from Table 11

    10.17182/hepdata.64353.v1/t4

    Double-differential trijet cross sections measured as a function of Q**2 and MEAN(PT(3JET)) using the kT jet algorithm. The total systematic...

  • Table 5

    Data from Table 12

    10.17182/hepdata.64353.v1/t5

    Double-differential trijet cross sections measured as a function of Q**2 and XI(3) using the kT jet algorithm. The total systematic...

  • Table 6

    Data from Table 13

    10.17182/hepdata.64353.v1/t6

    Double-differential inclusive jet cross sections measured as a function of Q**2 and PT(JET) using the anti-kT jet algorithm. The total...

  • Table 7

    Data from Table 14

    10.17182/hepdata.64353.v1/t7

    Double-differential dijet cross sections measured as a function of Q**2 and MEAN(PT(2JET)) using the anti-kT jet algorithm. The total systematic...

  • Table 8

    Data from Table 15

    10.17182/hepdata.64353.v1/t8

    Double-differential dijet cross sections measured as a function of Q**2 and XI(2) using the anti-kT jet algorithm. The total systematic...

  • Table 9

    Data from Table 16

    10.17182/hepdata.64353.v1/t9

    Double-differential trijet cross sections measured as a function of Q**2 and MEAN(PT(3JET)) using the anti-kT jet algorithm. The total systematic...

  • Table 10

    Data from Table 17

    10.17182/hepdata.64353.v1/t10

    Double-differential trijet cross sections measured as a function of Q**2 and XI(3) using the anti-kT jet algorithm. The total systematic...

  • Table 11

    Data from Table 18

    10.17182/hepdata.64353.v1/t11

    Double-differential normalised inclusive jet cross sections measured as a function of Q**2 and PT(JET) using the kT jet algorithm. The...

  • Table 12

    Data from Table 19

    10.17182/hepdata.64353.v1/t12

    Double-differential normalised dijet cross sections measured as a function of Q**2 and MEAN(PT(2JET)) using the kT jet algorithm. The total...

  • Table 13

    Data from Table 20

    10.17182/hepdata.64353.v1/t13

    Double-differential normalised inclusive dijet cross sections measured as a function of Q**2 and XI(2) using the kT jet algorithm. The...

  • Table 14

    Data from Table 21

    10.17182/hepdata.64353.v1/t14

    Double-differential normalised trijet cross sections measured as a function of Q**2 and MEAN(PT(3JET)) using the kT jet algorithm. The total...

  • Table 15

    Data from Table 22

    10.17182/hepdata.64353.v1/t15

    Double-differential normalised trijet cross sections measured as a function of Q**2 and XI(3) using the kT jet algorithm. The total...

  • Table 16

    Data from Table 23

    10.17182/hepdata.64353.v1/t16

    Double-differential normalised inclusive jet cross sections measured as a function of Q**2 and PT(JET) using the anti-kT jet algorithm. The...

  • Table 17

    Data from Table 24

    10.17182/hepdata.64353.v1/t17

    Double-differential normalised dijet cross sections measured as a function of Q**2 and MEAN(PT(2JET)) using the anti-kT jet algorithm. The total...

  • Table 18

    Data from Table 25

    10.17182/hepdata.64353.v1/t18

    Double-differential normalised inclusive dijet cross sections measured as a function of Q**2 and XI(2) using the anti-kT jet algorithm. The...

  • Table 19

    Data from Table 26

    10.17182/hepdata.64353.v1/t19

    Double-differential normalised trijet cross sections measured as a function of Q**2 and MEAN(PT(3JET)) using the anti-kT jet algorithm. The total...

  • Table 20

    Data from Table 27

    10.17182/hepdata.64353.v1/t20

    Double-differential normalised trijet cross sections measured as a function of Q**2 and XI(3) using the anti-kT jet algorithm. The total...

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