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Cross section of bottom electrons in...

Aronsson, Tomas Robert Prem-Raj.

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Cross section of bottom electrons in proton-proton collisions in the ALICE experiment.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Cross section of bottom electrons in proton-proton collisions in the ALICE experiment./
Author:	Aronsson, Tomas Robert Prem-Raj.
Description:	179 p.
Notes:	Source: Dissertation Abstracts International, Volume: 76-11(E), Section: B.
Contained By:	Dissertation Abstracts International76-11B(E).
Subject:	High energy physics. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3663505
ISBN:	9781321937008

Cross section of bottom electrons in proton-proton collisions in the ALICE experiment.
Aronsson, Tomas Robert Prem-Raj.

Cross section of bottom electrons in proton-proton collisions in the ALICE experiment. - 179 p.

Source: Dissertation Abstracts International, Volume: 76-11(E), Section: B.

Thesis (Ph.D.)--Yale University, 2015.

High-energy heavy-ion collisions at the LHC allow for the study of the properties of the quark-gluon plasma (QGP). Heavy quarks, charm and bottom, produced in the initial hard-scattering processes of the collision are excellent probes of the QGP. When heavy quarks traverse the QGP they are expected to lose energy and such energy loss is predicted to be smaller than for gluons and light quarks. On the other hand, recent experimental data indicate larger energy loss than expected. Heavy-flavor production can be studied using electrons from semi-leptonic decays of hadrpns containing charm and bottom quarks. The separation of electrons from these two sources (charm and bottom) is of crucial importance to address the expected mass dependence of energy loss. The ALICE EMCa1 detector possesses outstanding particle identification for electrons at high PT, and this detector is used to identify electrons with high purity. A two-track algorithm to select secondary vertices involving these electrons and surrounding charged tracks was developed and implemented, so called b-tagging; exploiting the tracking precision provided by the Inner Tracking System the electron and surrounding tracks are used to select displaced decay vertices that are likely to originate from B-hadron decay. Bottom electron production in the transverse momentum range 7-13 GeV/c in 7 TeV pp collisions is measured. The invariant cross section for bottom-decay electrons is calculated and compared to fixed ordered nextto-leading-log (FONLL) pQCD predictions. This will serve as a reference for studies of bottom suppression in PbPb collisions.

ISBN: 9781321937008Subjects--Topical Terms:

2144759
High energy physics.

Cross section of bottom electrons in proton-proton collisions in the ALICE experiment.
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520 $a High-energy heavy-ion collisions at the LHC allow for the study of the properties of the quark-gluon plasma (QGP). Heavy quarks, charm and bottom, produced in the initial hard-scattering processes of the collision are excellent probes of the QGP. When heavy quarks traverse the QGP they are expected to lose energy and such energy loss is predicted to be smaller than for gluons and light quarks. On the other hand, recent experimental data indicate larger energy loss than expected. Heavy-flavor production can be studied using electrons from semi-leptonic decays of hadrpns containing charm and bottom quarks. The separation of electrons from these two sources (charm and bottom) is of crucial importance to address the expected mass dependence of energy loss. The ALICE EMCa1 detector possesses outstanding particle identification for electrons at high PT, and this detector is used to identify electrons with high purity. A two-track algorithm to select secondary vertices involving these electrons and surrounding charged tracks was developed and implemented, so called b-tagging; exploiting the tracking precision provided by the Inner Tracking System the electron and surrounding tracks are used to select displaced decay vertices that are likely to originate from B-hadron decay. Bottom electron production in the transverse momentum range 7-13 GeV/c in 7 TeV pp collisions is measured. The invariant cross section for bottom-decay electrons is calculated and compared to fixed ordered nextto-leading-log (FONLL) pQCD predictions. This will serve as a reference for studies of bottom suppression in PbPb collisions.
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