Measurement of deuteron spectra and elliptic flow in Pb–Pb collisions at $\sqrt{s_{\mathrm {NN}}}$ = 2.76 TeV at the LHC

Acharya, Shreyasi; Adamova, Dagmar; Adolfsson, Jonatan; Aggarwal, Madan Mohan; Aglieri Rinella, Gianluca; Agnello, Michelangelo; Agrawal, Neelima; Ahammed, Zubayer; Ahmad, Nazeer; Ahn, Sang Un

doi:10.1140/epjc/s10052-017-5222-x

Measurement of deuteron spectra and elliptic flow in Pb–Pb collisions at $\sqrt{s_{\mathrm {NN}}}$ = 2.76 TeV at the LHC

ALICE

Collaboration

Jul 23, 2017

27 pages

Published in:

Eur.Phys.J.C 77 (2017) 10, 658

Published: Oct 4, 2017

e-Print:

1707.07304 [nucl-ex]

DOI:

10.1140/epjc/s10052-017-5222-x

Report number:

CERN-EP-2017-176

Experiments:

CERN-LHC-ALICE

View in:

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Abstract: (Springer)

The transverse momentum (

p_\mathrm{T}

) spectra and elliptic flow coefficient (

v_{2}

) of deuterons and anti-deuterons at mid-rapidity (

|y|<0.5

) are measured with the ALICE detector at the LHC in Pb–Pb collisions at

\sqrt{s_{\mathrm {NN}}}

= 2.76 TeV. The measurement of the

p_\mathrm{T}

spectra of (anti-)deuterons is done up to 8 GeV

/c

in 0–10% centrality class and up to 6 GeV

/c

in 10–20% and 20–40% centrality classes. The

v_{2}

is measured in the 0.8 <

p_\mathrm{T}

<~

5 GeV

/c

interval and in six different centrality intervals (0–5, 5–10, 10–20, 20–30, 30–40 and 40–50%) using the scalar product technique. Measured

\pi^{\pm }

, K

^{\pm }

and p+

\overline{\mathrm {p}}

transverse-momentum spectra and

v_{2}

are used to predict the deuteron

p_\mathrm{T}

spectra and

v_{2}

within the Blast-Wave model. The predictions are able to reproduce the

v_{2}

coefficient in the measured

p_\mathrm{T}

range and the transverse-momentum spectra for

p_\mathrm{T}

> 1.8 GeV

/c

within the experimental uncertainties. The measurement of the coalescence parameter

B_2

is performed, showing a

p_\mathrm{T}

dependence in contrast with the simplest coalescence model, which fails to reproduce also the measured

v_{2}

coefficient. In addition, the coalescence parameter

B_2

and the elliptic flow coefficient in the 20–40% centrality interval are compared with the AMPT model which is able, in its version without string melting, to reproduce the measured

v_{2}

(

p_\mathrm{T}

) and the

B_2

(

p_\mathrm{T}

) trend.

Note:

27 pages, 9 captioned figures, 3 tables, authors from page 22, published version, figures at http://aliceinfo.cern.ch/ArtSubmission/node/3691

deuteron: mass
antideuteron
transverse momentum: momentum spectrum
elliptic flow
model: blast wave
model: coalescence
final state
anisotropy
background
energy loss

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