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Estimate of the $\Upsilon$(1S) Production Cross-Section in pp Collisions at $\sqrt{s}$ = 8 TeV
New Phys.: Sae Mulli 2017; 67: 1438~1444
Published online December 29, 2017;
© 2017 New Physics: Sae Mulli.

Kang Seog LEE, Dong Ho MOON*

Department of Physics, Chonnam National University, Gwangju 61186, Korea
Correspondence to:
Received September 26, 2017; Revised October 18, 2017; Accepted October 20, 2017.
cc This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License ( which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
A quark-gluon plasma (QGP), which is a deconfined partonic state at extremely high temperature and energy density, can be studied in the laboratory through heavy-ion collision experiments. One of the most striking experimental signatures posited to confirm the formation of a QGP is the suppression of the quarkonia surrounding light quarks and gluons, which arises due to the screening of color charges. The nuclear modification factor ($R_{AA}$), which is the ratio of the quarkonia production cross-section in pp and PbPb collisions normalized by the number of binary collisions, is an important observable used to quantify such QGP effects. However, quarkonia production can be affected by several other contributions, such as a modification of nucleon parton distribution functions (nPDFs), multiple scattering and $p_{T}$ broadening, nuclear absorption, or comover break-up, known collectively as cold nuclear matter (CNM) effects. In 2015, pPb collision data acquired at the Large Hadron Collider (LHC) at $\sqrt{s_{NN}}$ = 8 TeV were used to investigate such CNM effects. In this work, we provide an estimate for the production cross-section $\sigma_{pp}$ of the $\Upsilon\text{(1S)}$ state, from which we then extrapolate an estimate for $R_{pPb}$ at $\sqrt{s_{NN}}$ = 8 TeV.
PACS numbers: 1.65.Qr, 24.85.+p
Keywords: Nuclear physics, Particle physics, Quark-gluon-plasma, Quarkonia, Upsilon, Cross section, Cold nuclear

April 2018, 68 (4)
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