Dielectron production in proton-proton collisions at $ \sqrt{s}=7 $ TeV

Shreyasi Acharya; Fernando Torales-Acosta; Dagmar Adamova; Jonatan Adolfsson; Madan Mohan Aggarwal; Gianluca Aglieri Rinella; Michelangelo Agnello; Neelima Agrawal; Zubayer Ahammed; Sang Un Ahn; Salvatore Aiola; Alexander Akindinov; Mohammad Al-Turany; Sk Noor Alam; Danilo Silva Albuquerque; Dmitry Aleksandrov; Bruno Alessandro; Jose Ruben Alfaro Molina; Yasir Ali; Andrea Alici; Anton Alkin; Johan Alme; Torsten Alt; Lucas Altenkamper; Igor Altsybeev; Mustafa Naji Anaam; Cristian Andrei; Dimitra Andreou; Harry Arthur Andrews; Anton Andronic; Massimo Angeletti; Venelin Anguelov; Christopher Daniel Anson; Tome Anticic; Federico Antinori; Pietro Antonioli; Rafay Anwar; Nicole Apadula; Laurent Bernard Aphecetche; Harald Appelshaeuser; Silvia Arcelli; Roberta Arnaldi; Oliver Werner Arnold; Ionut Cristian Arsene; Mesut Arslandok; Benjamin Audurier; Andre Augustinus; Ralf Peter Averbeck; Mohd Danish Azmi; Angela Badala; Yong Wook Baek; Stefano Bagnasco; Raphaelle Marie Bailhache; Renu Bala; Alberto Baldisseri; 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doi:10.15120/gsi-2019-00418

$Dielectron production in proton-proton collisions at $ \sqrt{s}=7 $ TeV$

Other

Dielectron production in proton-proton collisions at $ \sqrt{s}=7 $ TeV

Shreyasi Acharya, Fernando Torales-Acosta, Dagmar Adamova, Jonatan Adolfsson, Madan Mohan Aggarwal, Gianluca Aglieri Rinella, Michelangelo Agnello, Neelima Agrawal, Zubayer Ahammed, Sang Un Ahn, …

GSI Helmholtzzentrum fuer Schwerionenforschung, GSI, Darmstadt

01/01/2018

DOI: https://doi.org/10.15120/gsi-2019-00418

Abstract

7000 GeV

bottom

CERN LHC Coll

charm

cms

colliding beams

dependence

dimension

direct production

electron

electron positron

Experiment

experimental results

heavy quark

High Energy Physics

higher

History

impact parameter

mass dependence

mass spectrum

Mathematics

Monte Carlo

Nuclear Experiment

numerical calculations

order

Overview

p p

pair production

perturbation theory

phase space

photon

quantum chromodynamics

resolution

scattering

statistical

tracks

transverse momentum dependence

The first measurement of e$^{+}$e$^{−}$ pair production at mid-rapidity (|η$_{e}$| < 0.8) in pp collisions at $ \sqrt{s}=7 $ TeV with ALICE at the LHC is presented. The dielectron production is studied as a function of the invariant mass (m$_{ee}$ < 3.3 GeV/c$^{2}$), the pair transverse momentum (p$_{T,ee}$ < 8 GeV/c), and the pair transverse impact parameter (DCA$_{ee}$), i.e., the average distance of closest approach of the reconstructed electron and positron tracks to the collision vertex, normalised to its resolution. The results are compared with the expectations from a cocktail of known hadronic sources and are well described when PYTHIA is used to generate the heavy-flavour contributions. In the low-mass region (0.14 < m$_{ee}$ < 1.1 GeV/c$^{2}$), prompt and non-prompt e$^{+}$e$^{−}$ sources can be separated via the DCA$_{ee}$. In the intermediate-mass region (1.1 < m$_{ee}$ < 2.7 GeV/c$^{2}$), a double-differential fit to the data in m$_{ee}$ and p$_{T,ee}$ and a fit of the DCA$_{ee}$ distribution allow the total $ \mathrm{c}\overline{\mathrm{c}} $ and $ \mathrm{b}\overline{\mathrm{b}} $ cross sections to be extracted. Two different event generators, PYTHIA and POWHEG, can reproduce the shape of the two-dimensional m$_{ee}$ and p$_{T,ee}$ spectra, as well as the shape of the DCA$_{ee}$ distribution, reasonably well. However, differences in the $ \mathrm{c}\overline{\mathrm{c}} $ and $ \mathrm{b}\overline{\mathrm{b}} $ cross sections are observed when using the generators to extrapolate to full phase space. Finally, the ratio of inclusive to decay photons is studied via the measurement of virtual direct photons in the transverse-momentum range 1 < p$_{T}$ < 8 GeV/c. This is found to be unity within the statistical and systematic uncertainties and consistent with expectations from next-to-leading order perturbative quantum chromodynamic calculations.

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Title: Dielectron production in proton-proton collisions at $ \sqrt{s}=7 $ TeV
Creators: Shreyasi Acharya
Fernando Torales-Acosta
Dagmar Adamova
Jonatan Adolfsson
Madan Mohan Aggarwal
Gianluca Aglieri Rinella
Michelangelo Agnello
Neelima Agrawal
Zubayer Ahammed
Sang Un Ahn
Salvatore Aiola
Alexander Akindinov
Mohammad Al-Turany
Sk Noor Alam
Danilo Silva Albuquerque
Dmitry Aleksandrov
Bruno Alessandro
Jose Ruben Alfaro Molina
Yasir Ali
Andrea Alici
Anton Alkin
Johan Alme
Torsten Alt
Lucas Altenkamper
Igor Altsybeev
Mustafa Naji Anaam
Cristian Andrei
Dimitra Andreou
Harry Arthur Andrews
Anton Andronic
Massimo Angeletti
Venelin Anguelov
Christopher Daniel Anson
Tome Anticic
Federico Antinori
Pietro Antonioli
Rafay Anwar
Nicole Apadula
Laurent Bernard Aphecetche
Harald Appelshaeuser
Silvia Arcelli
Roberta Arnaldi
Oliver Werner Arnold
Ionut Cristian Arsene
Mesut Arslandok
Benjamin Audurier
Andre Augustinus
Ralf Peter Averbeck
Mohd Danish Azmi
Angela Badala
Yong Wook Baek
Stefano Bagnasco
Raphaelle Marie Bailhache
Renu Bala
Alberto Baldisseri
Markus Ball
Rama Chandra Baral
Anastasia Maria Barbano
Roberto Barbera
Francesco Barile
Luca Barioglio
Gergely Gabor Barnafoldi
Lee Stuart Barnby
Valerie Ramillien Barret
Paolo Bartalini
Klaus Barth
Esther Bartsch
Nicole Bastid
Sumit Basu
Guillaume Batigne
Boris Batyunya
Paul Christoph Batzing
Jose Luis Bazo Alba
Ian Gardner Bearden
Hans Beck
Cristina Bedda
Nirbhay Kumar Behera
Iouri Belikov
Francesca Bellini
Hector Bello Martinez
Rene Bellwied
Lucina Gabriela Espinoza Beltran
Vladimir Belyaev
Gyula Bencedi
Stefania Beole
Alexandru Bercuci
Yaroslav Berdnikov
Daniel Berenyi
Redmer Alexander Bertens
Dario Berzano
Latchezar Betev
Partha Pratim Bhaduri
Anju Bhasin
Inayat Rasool Bhat
Himani Bhatt
Buddhadeb Bhattacharjee
Jihyun Bhom
Antonio Bianchi
Livio Bianchi
Nicola Bianchi
Jaroslav Bielcik
Jana Bielcikova
Ante Bilandzic
Gabor Biro
Rathijit Biswas
Saikat Biswas
Justin Thomas Blair
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Kosei Yamakawa
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Zhongbao Yin
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In-Kwon Yoo
Jin Hee Yoon
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Valentina Zaccolo
Ali Zaman
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Henrique Jose Correa Zanoli
Nima Zardoshti
Andrey Zarochentsev
Petr Zavada
Nikolay Zavyalov
Hanna Paulina Zbroszczyk
Mikhail Zhalov
Xiaoming Zhang
Yonghong Zhang
Zuman Zhang
Chengxin Zhao
Vladimir Zherebchevskii
Natalia Zhigareva
Daicui Zhou
You Zhou
Zhuo Zhou
Hongsheng Zhu
Jianhui Zhu
Ya Zhu
Antonino Zichichi
Markus Bernhard Zimmermann
Gennady Zinovjev
Johann Zmeskal
Shuguang Zou
Collaboration Alice
Publisher: GSI Helmholtzzentrum fuer Schwerionenforschung, GSI, Darmstadt
Identifiers: 991006034134602656
Academic Unit: Physics
Language: English
Resource Type: Other

Dielectron production in proton-proton collisions at $ \sqrt{s}=7 $ TeV

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