Simultaneous measurement of forward-backward asymmetry and top polarization in dilepton final states from tt¯ production at the Tevatron

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PhysRevD.92.052007
Rights statement: © 2015 American Physical Society
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Simultaneous measurement of forward-backward asymmetry and top polarization in dilepton final states from tt¯ production at the Tevatron. / D0 Collaboration.
In: Physical Review D, Vol. 92, No. 5, 052007, 22.09.2015.

Research output: Contribution to Journal/Magazine › Journal article › peer-review

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@article{fc42598022b741c6a8dc96a25a7996a7,

title = "Simultaneous measurement of forward-backward asymmetry and top polarization in dilepton final states from tt¯ production at the Tevatron",

abstract = "We present a simultaneous measurement of the forward-backward asymmetry and the top-quark polarization in tt¯ production in dilepton final states using 9.7 fb−1 of proton-antiproton collisions at s√=1.96 TeV with the D0 detector. To reconstruct the distributions of kinematic observables we employ a matrix element technique that calculates the likelihood of the possible tt¯ kinematic configurations. After accounting for the presence of background events and for calibration effects, we obtain a forward-backward asymmetry of Att¯=(15.0±6.4(stat)±4.9(syst))% and a top-quark polarization times spin analyzing power in the beam basis of κP=(7.2±10.5(stat)±4.2(syst))%, with a correlation of −56% between the measurements. If we constrain the forward-backward asymmetry to its expected standard model value, we obtain a measurement of the top polarization of κP=(11.3±9.1(stat)±1.9(syst))%. If we constrain the top polarization to its expected standard model value, we measure a forward-backward asymmetry of Att¯=(17.5±5.6(stat)±3.1(syst))%. A combination with the D0 Att¯ measurement in the lepton+jets final state yields an asymmetry of Att¯=(11.8±2.5(stat)±1.3(syst))%. Within their respective uncertainties, all these results are consistent with the standard model ",

author = "Abazov, {V. M.} and B. Abbott and Acharya, {B. S.} and M. Adams and T. Adams and Agnew, {J. P.} and Alexeev, {G. D.} and G. Alkhazov and A. Alton and A. Askew and S. Atkins and K. Augsten and C. Avila and F. Badaud and L. Bagby and B. Baldin and Bandurin, {D. V.} and S. Banerjee and E. Barberis and P. Baringer and Bartlett, {J. F.} and U. Bassler and V. Bazterra and A. Bean and M. Begalli and L. Bellantoni and Beri, {S. B.} and G. Bernardi and R. Bernhard and I. Bertram and {Besanifmmode {\c c}else {\c c}on}, M. and R. Beuselinck and Bhat, {P. C.} and S. Bhatia and V. Bhatnagar and G. Blazey and S. Blessing and K. Bloom and A. Boehnlein and D. Boline and Boos, {E. E.} and G. Borissov and M. Borysova and A. Brandt and O. Brandt and H. Fox and D. Price and Ratoff, {P. N.} and A. Ross and Williams, {M. R. J.} and {D0 Collaboration}",

note = "{\textcopyright} 2015 American Physical Society Published: 22/9/2015, Received 22/7/2015 Evidence of Acceptance not available",

year = "2015",

month = sep,

day = "22",

doi = "10.1103/PhysRevD.92.052007",

language = "English",

volume = "92",

journal = "Physical Review D",

issn = "1550-7998",

publisher = "American Physical Society",

number = "5",

}

RIS

TY - JOUR

T1 - Simultaneous measurement of forward-backward asymmetry and top polarization in dilepton final states from tt¯ production at the Tevatron

AU - Abazov, V. M.

AU - Abbott, B.

AU - Acharya, B. S.

AU - Adams, M.

AU - Adams, T.

AU - Agnew, J. P.

AU - Alexeev, G. D.

AU - Alkhazov, G.

AU - Alton, A.

AU - Askew, A.

AU - Atkins, S.

AU - Augsten, K.

AU - Avila, C.

AU - Badaud, F.

AU - Bagby, L.

AU - Baldin, B.

AU - Bandurin, D. V.

AU - Banerjee, S.

AU - Barberis, E.

AU - Baringer, P.

AU - Bartlett, J. F.

AU - Bassler, U.

AU - Bazterra, V.

AU - Bean, A.

AU - Begalli, M.

AU - Bellantoni, L.

AU - Beri, S. B.

AU - Bernardi, G.

AU - Bernhard, R.

AU - Bertram, I.

AU - Besanifmmode çelse çon, M.

AU - Beuselinck, R.

AU - Bhat, P. C.

AU - Bhatia, S.

AU - Bhatnagar, V.

AU - Blazey, G.

AU - Blessing, S.

AU - Bloom, K.

AU - Boehnlein, A.

AU - Boline, D.

AU - Boos, E. E.

AU - Borissov, G.

AU - Borysova, M.

AU - Brandt, A.

AU - Brandt, O.

AU - Fox, H.

AU - Price, D.

AU - Ratoff, P. N.

AU - Ross, A.

AU - Williams, M. R. J.

AU - D0 Collaboration

PY - 2015/9/22

Y1 - 2015/9/22

N2 - We present a simultaneous measurement of the forward-backward asymmetry and the top-quark polarization in tt¯ production in dilepton final states using 9.7 fb−1 of proton-antiproton collisions at s√=1.96 TeV with the D0 detector. To reconstruct the distributions of kinematic observables we employ a matrix element technique that calculates the likelihood of the possible tt¯ kinematic configurations. After accounting for the presence of background events and for calibration effects, we obtain a forward-backward asymmetry of Att¯=(15.0±6.4(stat)±4.9(syst))% and a top-quark polarization times spin analyzing power in the beam basis of κP=(7.2±10.5(stat)±4.2(syst))%, with a correlation of −56% between the measurements. If we constrain the forward-backward asymmetry to its expected standard model value, we obtain a measurement of the top polarization of κP=(11.3±9.1(stat)±1.9(syst))%. If we constrain the top polarization to its expected standard model value, we measure a forward-backward asymmetry of Att¯=(17.5±5.6(stat)±3.1(syst))%. A combination with the D0 Att¯ measurement in the lepton+jets final state yields an asymmetry of Att¯=(11.8±2.5(stat)±1.3(syst))%. Within their respective uncertainties, all these results are consistent with the standard model

AB - We present a simultaneous measurement of the forward-backward asymmetry and the top-quark polarization in tt¯ production in dilepton final states using 9.7 fb−1 of proton-antiproton collisions at s√=1.96 TeV with the D0 detector. To reconstruct the distributions of kinematic observables we employ a matrix element technique that calculates the likelihood of the possible tt¯ kinematic configurations. After accounting for the presence of background events and for calibration effects, we obtain a forward-backward asymmetry of Att¯=(15.0±6.4(stat)±4.9(syst))% and a top-quark polarization times spin analyzing power in the beam basis of κP=(7.2±10.5(stat)±4.2(syst))%, with a correlation of −56% between the measurements. If we constrain the forward-backward asymmetry to its expected standard model value, we obtain a measurement of the top polarization of κP=(11.3±9.1(stat)±1.9(syst))%. If we constrain the top polarization to its expected standard model value, we measure a forward-backward asymmetry of Att¯=(17.5±5.6(stat)±3.1(syst))%. A combination with the D0 Att¯ measurement in the lepton+jets final state yields an asymmetry of Att¯=(11.8±2.5(stat)±1.3(syst))%. Within their respective uncertainties, all these results are consistent with the standard model

U2 - 10.1103/PhysRevD.92.052007

DO - 10.1103/PhysRevD.92.052007

M3 - Journal article

VL - 92

JO - Physical Review D

JF - Physical Review D

SN - 1550-7998

IS - 5

M1 - 052007

ER -

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