在质心能量平方根√[s](NN)] = 2.76 TeV的铅-铅碰撞中对中性π介子方位角各向异性的测量。
Measurement of the azimuthal anisotropy of neutral pions in Pb-Pb collisions at sqrt[s](NN)] = 2.76 TeV.
作者信息
Chatrchyan S, Khachatryan V, Sirunyan A M, Tumasyan A, Adam W, Aguilo E, Bergauer T, Dragicevic M, Erö J, Fabjan C, Friedl M, Frühwirth R, Ghete V M, Hammer J, Hörmann N, Hrubec J, Jeitler M, Kiesenhofer W, Knünz V, Krammer M, Krätschmer I, Liko D, Mikulec I, Pernicka M, Rahbaran B, Rohringer C, Rohringer H, Schöfbeck R, Strauss J, Taurok A, Waltenberger W, Walzel G, Widl E, Wulz C-E, Mossolov V, Shumeiko N, Suarez Gonzalez J, Bansal S, Cornelis T, De Wolf E A, Janssen X, Luyckx S, Mucibello L, Ochesanu S, Roland B, Rougny R, Selvaggi M, Staykova Z, Van Haevermaet H, Van Mechelen P, Van Remortel N, Van Spilbeeck A, Blekman F, Blyweert S, D'Hondt J, Gonzalez Suarez R, Kalogeropoulos A, Maes M, Olbrechts A, Van Doninck W, Van Mulders P, Van Onsem G P, Villella I, Clerbaux B, De Lentdecker G, Dero V, Gay A P R, Hreus T, Léonard A, Marage P E, Reis T, Thomas L, Vander Marcken G, Vander Velde C, Vanlaer P, Wang J, Adler V, Beernaert K, Cimmino A, Costantini S, Garcia G, Grunewald M, Klein B, Lellouch J, Marinov A, Mccartin J, Ocampo Rios A A, Ryckbosch D, Strobbe N, Thyssen F, Tytgat M, Verwilligen P, Walsh S, Yazgan E, Zaganidis N, Basegmez S, Bruno G, Castello R, Ceard L, Delaere C, du Pree T, Favart D, Forthomme L, Giammanco A, Hollar J, Lemaitre V, Liao J, Militaru O, Nuttens C, Pagano D, Pin A, Piotrzkowski K, Schul N, Vizan Garcia J M, Beliy N, Caebergs T, Daubie E, Hammad G H, Alves G A, Correa Martins Junior M, De Jesus Damiao D, Martins T, Pol M E, Souza M H G, Aldá Júnior W L, Carvalho W, Custódio A, Da Costa E M, De Oliveira Martins C, Fonseca De Souza S, Matos Figueiredo D, Mundim L, Nogima H, Oguri V, Prado Da Silva W L, Santoro A, Soares Jorge L, Sznajder A, Anjos T S, Bernardes C A, Dias F A, Fernandez Perez Tomei T R, Gregores E M, Lagana C, Marinho F, Mercadante P G, Novaes S F, Padula Sandra S, Genchev V, Iaydjiev P, Piperov S, Rodozov M, Stoykova S, Sultanov G, Tcholakov V, Trayanov R, Vutova M, Dimitrov A, Hadjiiska R, Kozhuharov V, Litov L, Pavlov B, Petkov P, Bian J G, Chen G M, Chen H S, Jiang C H, Liang D, Liang S, Meng X, Tao J, Wang J, Wang X, Wang Z, Xiao H, Xu M, Zang J, Zhang Z, Asawatangtrakuldee C, Ban Y, Guo S, Guo Y, Li W, Liu S, Mao Y, Qian S J, Teng H, Wang D, Zhang L, Zhu B, Zou W, Avila C, Gomez J P, Gomez Moreno B, Osorio Oliveros A F, Sanabria J C, Godinovic N, Lelas D, Plestina R, Polic D, Puljak I, Antunovic Z, Kovac M, Brigljevic V, Duric S, Kadija K, Luetic J, Morovic S, Attikis A, Galanti M, Mavromanolakis G, Mousa J, Nicolaou C, Ptochos F, Razis P A, Finger M, Finger M, Assran Y, Elgammal S, Ellithi Kamel A, Khalil S, Mahmoud M A, Radi A, Kadastik M, Müntel M, Raidal M, Rebane L, Tiko A, Eerola P, Fedi G, Voutilainen M, Härkönen J, Heikkinen A, Karimäki V, Kinnunen R, Kortelainen M J, Lampén T, Lassila-Perini K, Lehti S, Lindén T, Luukka P, Mäenpää T, Peltola T, Tuominen E, Tuominiemi J, Tuovinen E, Ungaro D, Wendland L, Banzuzi K, Karjalainen A, Korpela A, Tuuva T, Besancon M, Choudhury S, Dejardin M, 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Lazaridis C, Leonard J, Loveless R, Mohapatra A, Ojalvo I, Palmonari F, Pierro G A, Ross I, Savin A, Smith W H, Swanson J
机构信息
Yerevan Physics Institute, Yerevan, Armenia.
Institut für Hochenergiephysik der OeAW, Wien, Austria.
出版信息
Phys Rev Lett. 2013 Jan 25;110(4):042301. doi: 10.1103/PhysRevLett.110.042301. Epub 2013 Jan 22.
First measurements of the azimuthal anisotropy of neutral pions produced in Pb-Pb collisions at a center-of-mass energy of sqrt[s(NN)] = 2.76 TeV are presented. The amplitudes of the second Fourier component (v(2)) of the π(0) azimuthal distributions are extracted using an event-plane technique. The values of v(2) are studied as a function of the neutral pion transverse momentum (p(T)) for different classes of collision centrality in the kinematic range 1.6<p(T) <8.0 GeV/c, within the pseudorapidity interval |η|<0.8. The CMS measurements of v(2) (p(T)) are similar to previously reported π(0) azimuthal anisotropy results from sqrt[s(NN)] = 200 GeV Au-Au collisions at RHIC, despite a factor of ∼ 14 increase in the center-of-mass energy. In the momentum range 2.5<p(T)<5.0 GeV/c, the neutral pion anisotropies are found to be smaller than those observed by CMS for inclusive charged particles.
给出了在质心能量√[s(NN)] = 2.76 TeV的铅-铅碰撞中产生的中性π介子方位角各向异性的首次测量结果。使用事件平面技术提取了π(0)方位角分布的第二傅里叶分量(v(2))的幅度。在运动学范围1.6 < p(T) < 8.0 GeV/c内，对于不同碰撞中心度类别，在赝快度区间|η| < 0.8内，研究了v(2)作为中性π介子横向动量(p(T))的函数。CMS对v(2)(p(T))的测量结果与先前报道的在相对论重离子对撞机（RHIC）上质心能量为√[s(NN)] = 200 GeV的金-金碰撞中π(0)方位角各向异性结果相似，尽管质心能量增加了约14倍。在动量范围2.5 < p(T) < 5.0 GeV/c内，发现中性π介子各向异性小于CMS对包含性带电粒子观测到的各向异性。
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