We study the transverse momentum ( $p_T$ ) differential anisotropic flow and flow fluctuation in Pb+Pb collisions at $\sqrt{s_{_{NN}}}$ =5.02 TeV at the LHC. A (3+1)-dimensional CLVisc hydrodynamics framework with fluctuating TRENTO (or AMPT) initial conditions is utilized to simulate the space-time evolution of the quark-gluon plasma (QGP) medium. The effects of shear viscosity and the sub-nucleon structure on anisotropic flow and flow fluctuation are analyzed. Our result shows that shear viscosity tends to suppress both flow coefficients ( ${v_2\{2}\}$ , ${v_2\{4\}}$ , and ${\langle v_2\rangle}$ ) and flow fluctuation ( ${\sigma_{v_2}}$ ) owing to its smearing effect on local density fluctuation. The flow coefficients appear to be insensitive to the sub-nucleon structure, whereas the flow fluctuation ${\sigma_{v_2}}$ tends to be suppressed by the sub-nucleon structure in central collisions but enhanced in peripheral collisions. After taking into account the sub-nucleon structure effect, our numerical result can qualitatively describe the relative flow fluctuations ( ${v_2\{4\}/v_2\{2\}}$ , $F({v_2})$ ) measured by the ALICE Collaboration at the LHC. We further investigate the effects of shear viscosity, sub-nucleon structure, and initial condition model on the flow angle and flow magnitude decorrelations ( ${A_2^f}$ , ${M_2^f}$ ) using the four-particle correlation method. We find that the flow decorrelation effect is typically stronger in central collisions than in peripheral collisions. The flow angle decorrelation is found to be insensitive to the shear viscosity and sub-nucleon structure, whereas the flow magnitude decorrelation shows quite different behaviors when using the TRENTO and AMPT initial condition models. Our study sheds light on the anisotropic flow, transport properties, and initial structure of the QGP created in high-energy nuclear collisions.

China

Germany

Jie Zhu

Canada

Xiang-Yu Wu

Guang-You Qin

Anisotropic flow, flow fluctuation, and flow decorrelation in relativistic heavy-ion collisions: the roles of sub-nucleon structure and shear viscosity * Supported in part by the Natural Science Foundation of China (12225503, 11890710, 11890711, 11935007). Zhu Jie is supported in part by the China Scholarship Council (202306770009). Wu Xiang-Yu is supported in part by the National Science Foundation within the framework of the JETSCAPE collaboration (OAC-2004571) and in part by the Natural Sciences and Engineering Research Council of Canada. Some of the calculations were performed in the Nuclear Science Computing Center at Central China Normal University (NSC$^{3}$), Wuhan, Hubei, China.

We introduce a technique to realize brane wrapping and double dimensional reduction in the context of Alexandrov-Kontsevich-Schwarz-Zaboronsky (AKSZ) topological sigma models and also in their target spaces, which are symplectic <math><mrow><msub><mrow><mi>L</mi></mrow><mrow><mi>n</mi></mrow></msub></mrow></math> algebroids (i.e., <math><mi>Q</mi><mi>P</mi></math> manifolds). Our procedure involves a novel coisotropic reduction combined with an AKSZ transgression that realizes degree shifting; the reduced <math><mi>Q</mi><mi>P</mi></math> manifold depends on topological data of the “wrapped” cycle. We check our procedure against the known rules for fluxes under wrapping in the context of M-theory/type IIA duality, and we also find a new relation between Courant algebroids and Poisson manifolds.

Belgium

Alex S. Arvanitakis

United States

David Tennyson

Brane wrapping, Alexandrov-Kontsevich-Schwarz-Zaboronsky sigma models, and <math><mi>Q</mi><mi>P</mi></math> manifolds

Using the vector exchange interaction in the local hidden gauge approach, which in the light quark sector generates the chiral Lagrangians and has produced realistic results for 
					 and the hidden charm pentaquark states, we study the meson-baryon interactions in the coupled channels that lead to the 
					 and 
					 excited states of the molecular type. We obtain seven states of the 
					 type with energies between 
					 and 
					 MeV, and one 
					 state at 
					 MeV.
				

Brazil

J. M. Dias

Qi-Xin Yu

Wei-Hong Liang

Zhi-Feng Sun

Ju-Jun Xie

Spain

E. Oset

Ξbb and Ωbbb molecular states Partly supported by the National Natural Science Foundation of China (11975083, 11947413, 11847317, 11565007, 11735003, 1191101015). Q. X Yu acknowledges the support from the National Natural Science Foundation of China (11775024, 11575023, 11805153) and China Scholarship Council. Partly supported by the Spanish Ministerio de Economia y Competitividad and European FEDER funds (FIS2017- 84038-C2-1-P B, FIS2017-84038-C2-2-P B), and the Generalitat Valenciana in the program Prometeo II-2014/068, and the project Severo Ochoa of IFIC, SEV-2014-0398

C. Adolph

Italy

M.G. Alekseev

JINR

V. Yu. Alexakhin

Russia

Yu. Alexandrov

G.D. Alexeev

A. Amoroso

France

V. Andrieux

CERN

A. Austregesilo

Poland

B. Badełek

F. Balestra

J. Barth

G. Baum

Y. Bedfer

A. Berlin

J. Bernhard

R. Bertini

K. Bicker

J. Bieling

R. Birsa

J. Bisplinghoff

M. Boer

Portugal

P. Bordalo

F. Bradamante

C. Braun

A. Bravar

A. Bressan

M. Büchele

E. Burtin

L. Capozza

M. Chiosso

S.U. Chung

A. Cicuttin

M.L. Crespo

S. Dalla Torre

S.S. Dasgupta

India

S. Dasgupta

O. Yu. Denisov

S.V. Donskov

Japan

N. Doshita

V. Duic

W. Dünnweber

M. Dziewiecki

A. Efremov

C. Elia

P.D. Eversheim

W. Eyrich

M. Faessler

A. Ferrero

A. Filin

Czechia

M. Finger

M. Finger Jr.

H. Fischer

C. Franco

N. du Fresne von Hohenesche

J.M. Friedrich

V. Frolov

R. Garfagnini

F. Gautheron

O.P. Gavrichtchouk

S. Gerassimov

R. Geyer

M. Giorgi

I. Gnesi

B. Gobbo

S. Goertz

S. Grabmüller

A. Grasso

B. Grube

R. Gushterski

A. Guskov

T. Guthörl

F. Haas

D. von Harrach

F.H. Heinsius

F. Herrmann

C. Heß

F. Hinterberger

Ch. Höppner

N. Horikawa

N. d’Hose

S. Huber

S. Ishimoto

Yu. Ivanshin

T. Iwata

R. Jahn

V. Jary

P. Jasinski

R. Joosten

E. Kabuß

D. Kang

B. Ketzer

G.V. Khaustov

Yu. A. Khokhlov

Yu. Kisselev

F. Klein

K. Klimaszewski

J.H. Koivuniemi

V.N. Kolosov

K. Kondo

K. Königsmann

Erratum to: Hadron transverse momentum distributions in muon deep inelastic scattering at 160Â GeV/ c

Spin-averaged asymmetries in the azimuthal distributions of positive and negative hadrons produced in deep inelastic scattering were measured using the CERN SPS longitudinally polarised muon beam at 160Â GeV/c and a 6 LiD target. The amplitudes of the three azimuthal modulations cosâ¡Ïh , cosâ¡2Ïh and sinâ¡Ïh were obtained binning the data separately in each of the relevant kinematic variables x , z or pTh and binning in a three-dimensional grid of these three variables. The amplitudes of the cosâ¡Ïh and cosâ¡2Ïh modulations show strong kinematic dependencies both for positive and negative hadrons.

R. Akhunzyanov

M.G. Alexeev

V. Anosov

R. Beck

M. Bodlak

Q. Curiel

O.Yu. Denisov

N. du Fresne von Hohenesche

M. Gorzellik

D. Hahne

R. Hashimoto

N. d'Hose

A. Ivanov

P. Joerg

Yu.A. Khokhlov

Measurement of azimuthal hadron asymmetries in semi-inclusive deep inelastic scattering off unpolarised nucleons

A measurement of the azimuthal asymmetry in dihadron production in deep-inelastic scattering of muons on transversely polarised proton (NH 3 ) targets is presented. They provide independent access to the transversity distribution functions through the measurement of the Collins asymmetry in single hadron production. The data were taken in the year 2010 with the COMPASS spectrometer using a 160 GeV/c muon beam of the CERN SPS, increasing by a factor of about four the overall statistics with respect to the previously published data taken in the year 2007. The measured sizeable asymmetry is in good agreement with the published data. An approximate equality of the Collins asymmetry and the dihadron asymmetry is observed, suggesting a common physical mechanism in the underlying fragmentation.

A high-statistics measurement of transverse spin effects in dihadron production from muon–proton semi-inclusive deep-inelastic scattering

Exclusive production of Ï0 mesons was studied at the COMPASS experiment by scattering 160Â GeV/c muons off transversely polarised protons. Five single-spin and three double-spin azimuthal asymmetries were measured as a function of Q2 , xBj , or pT2 . The sinÏS asymmetry is found to be â0.019Â±0.008(stat.)Â±0.003(syst.) . All other asymmetries are also found to be of small magnitude and consistent with zero within experimental uncertainties. Very recent calculations using a GPD-based model agree well with the present results. The data is interpreted as evidence for the existence of chiral-odd, transverse generalized parton distributions.

V.Yu. Alexakhin

Transverse target spin asymmetries in exclusive ρ0 muoproduction