Azimuthally-differential pion femtoscopy relative to the third harmonic event plane in Pb-Pbcollisions at root(NN)-N-S=2.76TeV

S. Acharya; F.T. Acosta; D. Adamova; J Adolfsson; MM. Aggarwal; G.A. Rinella; Maria Agnello; N. Agrawal; Z. Ahammed; S.U. Ahn; S. Aiola; A. Akindinov; M. Al-Turany; S. Alam; DSD Albuquerque; D. Aleksandrov; B Alessandro; Rafael A. Molina; Yusuf Ali; A. Alici; A. Alkin; J. Alme; T. Alt; Ian Bearden; Ante Bilandzic; bsm989 bsm989; Katarina Gajdosova; Christian Alexander Bourjau; Jens Jørgen Gaardhøje; Børge Svane Nielsen; Freja Thoresen; You Zhou; Christian Holm Christensen; Marek Chojnacki; Lais Ozelin De Lima Pimentel

doi:10.1016/j.physletb.2018.06.042

Azimuthally-differential pion femtoscopy relative to the third harmonic event plane in Pb-Pbcollisions at root(NN)-N-S=2.76TeV

S. Acharya, F.T. Acosta, D. Adamova, J Adolfsson, MM. Aggarwal, G.A. Rinella, Maria Agnello, N. Agrawal, Z. Ahammed, S.U. Ahn, S. Aiola, A. Akindinov, M. Al-Turany, S. Alam, DSD Albuquerque, D. Aleksandrov, B Alessandro, Rafael A. Molina, Yusuf Ali, A. AliciA. Alkin, J. Alme, T. Alt, Ian Bearden, Ante Bilandzic, bsm989 bsm989, Katarina Gajdosova, Christian Alexander Bourjau, Jens Jørgen Gaardhøje, Børge Svane Nielsen, Freja Thoresen, You Zhou, Christian Holm Christensen, Marek Chojnacki, Lais Ozelin De Lima Pimentel

Experimental Particle Physics

3 Citations (Scopus)

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Abstract

Azimuthally-differential femtoscopic measurements, being sensitive to spatio-temporal characteristics of the source as well as to the collective velocity fields at freeze out, provide very important information on the nature and dynamics of the system evolution. While the HBT radii oscillations relative to the second harmonic event plane measured recently reflect mostly the spatial geometry of the source, model studies have shown that the HBT radii oscillations relative to the third harmonic event plane are predominantly defined by the velocity fields. In this Letter, we present the first results on azimuthally-differential pion femtoscopy relative to the third harmonic event plane as a function of the pion pair transverse momentum k_T for different collision centralities in Pb–Pb collisions at s_NN=2.76 TeV. We find that the R_side and R_out radii, which characterize the pion source size in the directions perpendicular and parallel to the pion transverse momentum, oscillate in phase relative to the third harmonic event plane, similar to the results from 3+1D hydrodynamical calculations. The observed radii oscillations unambiguously signal a collective expansion and anisotropy in the velocity fields. A comparison of the measured radii oscillations with the Blast-Wave model calculations indicate that the initial state triangularity is washed-out at freeze out.

Original language	English
Journal	Physics Letters B
Volume	785
Pages (from-to)	320-331
Number of pages	12
ISSN	0370-2693
DOIs	https://doi.org/10.1016/j.physletb.2018.06.042
Publication status	Published - 10 Oct 2018

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Acharya, S., Acosta, F. T., Adamova, D., Adolfsson, J., Aggarwal, MM., Rinella, G. A., Agnello, M., Agrawal, N., Ahammed, Z., Ahn, S. U., Aiola, S., Akindinov, A., Al-Turany, M., Alam, S., Albuquerque, DSD., Aleksandrov, D., Alessandro, B., Molina, R. A., Ali, Y., ... Ozelin De Lima Pimentel, L. (2018). Azimuthally-differential pion femtoscopy relative to the third harmonic event plane in Pb-Pbcollisions at root(NN)-N-S=2.76TeV. Physics Letters B, 785, 320-331. https://doi.org/10.1016/j.physletb.2018.06.042

Acharya, S, Acosta, FT, Adamova, D, Adolfsson, J, Aggarwal, MM, Rinella, GA, Agnello, M, Agrawal, N, Ahammed, Z, Ahn, SU, Aiola, S, Akindinov, A, Al-Turany, M, Alam, S, Albuquerque, DSD, Aleksandrov, D, Alessandro, B, Molina, RA, Ali, Y, Alici, A, Alkin, A, Alme, J, Alt, T, Bearden, I, Bilandzic, A, bsm989, B, Gajdosova, K, Bourjau, CA, Gaardhøje, JJ , Nielsen, BS, Thoresen, F, Zhou, Y , Christensen, CH, Chojnacki, M & Ozelin De Lima Pimentel, L 2018, 'Azimuthally-differential pion femtoscopy relative to the third harmonic event plane in Pb-Pbcollisions at root(NN)-N-S=2.76TeV', Physics Letters B, vol. 785, pp. 320-331. https://doi.org/10.1016/j.physletb.2018.06.042

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title = "Azimuthally-differential pion femtoscopy relative to the third harmonic event plane in Pb-Pbcollisions at root(NN)-N-S=2.76TeV",

abstract = "Azimuthally-differential femtoscopic measurements, being sensitive to spatio-temporal characteristics of the source as well as to the collective velocity fields at freeze out, provide very important information on the nature and dynamics of the system evolution. While the HBT radii oscillations relative to the second harmonic event plane measured recently reflect mostly the spatial geometry of the source, model studies have shown that the HBT radii oscillations relative to the third harmonic event plane are predominantly defined by the velocity fields. In this Letter, we present the first results on azimuthally-differential pion femtoscopy relative to the third harmonic event plane as a function of the pion pair transverse momentum kT for different collision centralities in Pb–Pb collisions at sNN=2.76 TeV. We find that the Rside and Rout radii, which characterize the pion source size in the directions perpendicular and parallel to the pion transverse momentum, oscillate in phase relative to the third harmonic event plane, similar to the results from 3+1D hydrodynamical calculations. The observed radii oscillations unambiguously signal a collective expansion and anisotropy in the velocity fields. A comparison of the measured radii oscillations with the Blast-Wave model calculations indicate that the initial state triangularity is washed-out at freeze out.",

author = "S. Acharya and F.T. Acosta and D. Adamova and J Adolfsson and MM. Aggarwal and G.A. Rinella and Maria Agnello and N. Agrawal and Z. Ahammed and S.U. Ahn and S. Aiola and A. Akindinov and M. Al-Turany and S. Alam and DSD Albuquerque and D. Aleksandrov and B Alessandro and Molina, {Rafael A.} and Yusuf Ali and A. Alici and A. Alkin and J. Alme and T. Alt and Ian Bearden and Ante Bilandzic and bsm989 bsm989 and Katarina Gajdosova and Bourjau, {Christian Alexander} and Gaardh{\o}je, {Jens J{\o}rgen} and Nielsen, {B{\o}rge Svane} and Freja Thoresen and You Zhou and Christensen, {Christian Holm} and Marek Chojnacki and {Ozelin De Lima Pimentel}, Lais",

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doi = "10.1016/j.physletb.2018.06.042",

language = "English",

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pages = "320--331",

journal = "Physics Letters B",

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TY - JOUR

T1 - Azimuthally-differential pion femtoscopy relative to the third harmonic event plane in Pb-Pbcollisions at root(NN)-N-S=2.76TeV

AU - Acharya, S.

AU - Acosta, F.T.

AU - Adamova, D.

AU - Adolfsson, J

AU - Aggarwal, MM.

AU - Rinella, G.A.

AU - Agnello, Maria

AU - Agrawal, N.

AU - Ahammed, Z.

AU - Ahn, S.U.

AU - Aiola, S.

AU - Akindinov, A.

AU - Al-Turany, M.

AU - Alam, S.

AU - Albuquerque, DSD

AU - Aleksandrov, D.

AU - Alessandro, B

AU - Molina, Rafael A.

AU - Ali, Yusuf

AU - Alici, A.

AU - Alkin, A.

AU - Alme, J.

AU - Alt, T.

AU - Bearden, Ian

AU - Bilandzic, Ante

AU - bsm989, bsm989

AU - Gajdosova, Katarina

AU - Bourjau, Christian Alexander

AU - Gaardhøje, Jens Jørgen

AU - Nielsen, Børge Svane

AU - Thoresen, Freja

AU - Zhou, You

AU - Christensen, Christian Holm

AU - Chojnacki, Marek

AU - Ozelin De Lima Pimentel, Lais

PY - 2018/10/10

Y1 - 2018/10/10

N2 - Azimuthally-differential femtoscopic measurements, being sensitive to spatio-temporal characteristics of the source as well as to the collective velocity fields at freeze out, provide very important information on the nature and dynamics of the system evolution. While the HBT radii oscillations relative to the second harmonic event plane measured recently reflect mostly the spatial geometry of the source, model studies have shown that the HBT radii oscillations relative to the third harmonic event plane are predominantly defined by the velocity fields. In this Letter, we present the first results on azimuthally-differential pion femtoscopy relative to the third harmonic event plane as a function of the pion pair transverse momentum kT for different collision centralities in Pb–Pb collisions at sNN=2.76 TeV. We find that the Rside and Rout radii, which characterize the pion source size in the directions perpendicular and parallel to the pion transverse momentum, oscillate in phase relative to the third harmonic event plane, similar to the results from 3+1D hydrodynamical calculations. The observed radii oscillations unambiguously signal a collective expansion and anisotropy in the velocity fields. A comparison of the measured radii oscillations with the Blast-Wave model calculations indicate that the initial state triangularity is washed-out at freeze out.

AB - Azimuthally-differential femtoscopic measurements, being sensitive to spatio-temporal characteristics of the source as well as to the collective velocity fields at freeze out, provide very important information on the nature and dynamics of the system evolution. While the HBT radii oscillations relative to the second harmonic event plane measured recently reflect mostly the spatial geometry of the source, model studies have shown that the HBT radii oscillations relative to the third harmonic event plane are predominantly defined by the velocity fields. In this Letter, we present the first results on azimuthally-differential pion femtoscopy relative to the third harmonic event plane as a function of the pion pair transverse momentum kT for different collision centralities in Pb–Pb collisions at sNN=2.76 TeV. We find that the Rside and Rout radii, which characterize the pion source size in the directions perpendicular and parallel to the pion transverse momentum, oscillate in phase relative to the third harmonic event plane, similar to the results from 3+1D hydrodynamical calculations. The observed radii oscillations unambiguously signal a collective expansion and anisotropy in the velocity fields. A comparison of the measured radii oscillations with the Blast-Wave model calculations indicate that the initial state triangularity is washed-out at freeze out.

U2 - 10.1016/j.physletb.2018.06.042

DO - 10.1016/j.physletb.2018.06.042

M3 - Journal article

SN - 0370-2693

VL - 785

SP - 320

EP - 331

JO - Physics Letters B

JF - Physics Letters B

ER -

Azimuthally-differential pion femtoscopy relative to the third harmonic event plane in Pb-Pbcollisions at root(NN)-N-S=2.76TeV

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