Several observables sensitive to the fragmentation of b quarks into b hadrons are measured using 36 fb(-1) of root s = 13 TeV proton-proton collision data collected with the ATLAS detector at the LHC. Jets containing b hadrons are obtained from a sample of dileptonic (tt) over bar events, and the associated set of charged-particle tracks is separated into those from the primary pp interaction vertex and those from the displaced b-decay secondary vertex. This division is used to construct observables that characterize the longitudinal and transverse momentum distributions of the b hadron within the jet. The measurements have been corrected for detector effects and provide a test of heavy-quark-fragmentation modeling at the LHC in a system where the top-quark decay products are color connected to the proton beam remnants. The unfolded distributions are compared with the predictions of several modern Monte Carlo parton-shower generators and generator tunes, and a wide range of agreement with the data is observed, with p values varying from 5 x 10(-4) to 0.98. These measurements complement similar measurements from e(+)e(-) collider experiments in which the b quarks originate from a color singlet Z/gamma*.

G. Aad, B. Abbott, D.???C. Abbott, A. Abed Abud, K. Abeling, D.???K. Abhayasinghe, et al. (2022). Measurements of jet observables sensitive to b -quark fragmentation in t¯t events at the LHC with the ATLAS detector. PHYSICAL REVIEW D, 106(3), 032008-1-032008-33 [10.1103/physrevd.106.032008].

Measurements of jet observables sensitive to b -quark fragmentation in t¯t events at the LHC with the ATLAS detector

F. Alfonsi;L. Bellagamba;M. Bindi;D. Boscherini;G. Cabras;D. Caforio;G. Carratta;L. Clissa;S. De Castro;F. Fabbri;L. Fabbri;M. Franchini;A. Gabrielli;B. Giacobbe;L. Massa;A. Polini;L. Rinaldi;M. Romano;C. Sbarra;A. Sbrizzi;N. Semprini-Cesari;M. Sioli;K. Todome;S. Valentinetti;M. Villa;C. Vittori;A. Zoccoli;
2022

Abstract

Several observables sensitive to the fragmentation of b quarks into b hadrons are measured using 36 fb(-1) of root s = 13 TeV proton-proton collision data collected with the ATLAS detector at the LHC. Jets containing b hadrons are obtained from a sample of dileptonic (tt) over bar events, and the associated set of charged-particle tracks is separated into those from the primary pp interaction vertex and those from the displaced b-decay secondary vertex. This division is used to construct observables that characterize the longitudinal and transverse momentum distributions of the b hadron within the jet. The measurements have been corrected for detector effects and provide a test of heavy-quark-fragmentation modeling at the LHC in a system where the top-quark decay products are color connected to the proton beam remnants. The unfolded distributions are compared with the predictions of several modern Monte Carlo parton-shower generators and generator tunes, and a wide range of agreement with the data is observed, with p values varying from 5 x 10(-4) to 0.98. These measurements complement similar measurements from e(+)e(-) collider experiments in which the b quarks originate from a color singlet Z/gamma*.
2022
G. Aad, B. Abbott, D.???C. Abbott, A. Abed Abud, K. Abeling, D.???K. Abhayasinghe, et al. (2022). Measurements of jet observables sensitive to b -quark fragmentation in t¯t events at the LHC with the ATLAS detector. PHYSICAL REVIEW D, 106(3), 032008-1-032008-33 [10.1103/physrevd.106.032008].
G. Aad; B. Abbott; D.???C. Abbott; A. Abed Abud; K. Abeling; D.???K. Abhayasinghe; S.???H. Abidi; O.???S. AbouZeid; N.???L. Abraham; H. Abramowicz; H....espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/903483
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