Charged jet cross sections and properties in proton- proton collisions at √s = 7 TeV-猫眼课题宝

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2014

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B. Kileng;B. Kim;D. Kim;J. Kim;M. Kim;S. Kim;T. Kim;S. Kirsch;I. Kisel;S. Kiselev;A. Kisiel;G. Kiss;J. Klay;J. Klein;C. Klein-Bösing;A. Kluge;M. L. Knichel;A. Knospe;C. Kobdaj;M. Kofarago;T. Kollegger;A. Kolojvari;V. Kondratiev;N. Kondratyeva;A. Konevskikh;V. Kovalenko;M. Kowalski;S. Kox;G. K. Meethaleveedu;J. Kral;I. Králik;M. Krelina;M. Kretz;M. Krivda;E. Kryshen;M. Krzewicki;Y. Kucheriaev;T. Kugathasan;C. Kuhn;P. Kuijer;I. Kulakov;J. Kumar;P. Kurashvili;A. Kurepin;A. Kurepin;A. Kuryakin;S. Kushpil;M. Kweon;Y. Kwon;P. L. Guevara;C. L. Fernandes;I. Lakomov;R. Langoy;C. Lara;A. Lardeux;A. Lattuca;S. L. Pointe;P. Rocca;R. Lea;I. Legrand;J. Lehnert;V. Lenti;E. Leogrande;M. Leoncino;P. Lévai;S. Li;J. Lien;R. Lietava;S. Lindal;V. Lindenstruth;C. Lippmann;M. Lisa;H. Ljunggren;D. F. Lodato;P. Loenne;V. Loginov;D. Lohner;C. Loizides;X. Lopez;E. L. Torres;P. Luettig;M. Lunardon;G. Luparello;A. Maevskaya;M. Mager;S. Mahmood;A. Maire;R. Majka;M. Malaev;I. M. Cervantes;L. Malinina;P. Malzacher;A. Mamonov;L. Manceau;V. Manko;F. Manso;V. Manzari;M. Marchisone;G. Margagliotti;A. Margotti;A. Marín;C. Markert;M. Marquard;I. Martashvili;N. Martin;P. Martinengo;M. Martínez;G. García;J. M. Blanco;Y. Martynov;S. Masciocchi;M. Masera;A. Masoni;L. Massacrier;A. Mastroserio;A. Matyja;C. Mayer;J. Mazer;M. Mazzoni;D. Mcdonald;F. Meddi;A. Menchaca-Rocha;E. Meninno;J. Pérez;M. Meres;Y. Miake;K. Mikhaylov;L. Milano;J. Milosevic;A. Mischke;A. N. Mishra;J. Mitra;C. Mitu;J. Mlynarz;N. Mohammadi;B. Mohanty;L. Molnár;L. M. Zétina;E. Montes;M. Morando;D. Godoy;S. Moretto;A. Morreale;A. Morsch;E. Mudnić;D. Mühlheim;S. Muhuri;M. Mukherjee;H. Müller;S. Murray;L. Musa;J. Musinsky;R. Nania;E. Nappi;S. Nazarenko;A. Nedosekin;M. Niculescu;J. Niedziela;S. Nikolaev;S. Nikulin;V. Nikulin;B. Nilsen;F. Noferini;P. Nomokonov;G. Nooren;A. Nyanin;J. Nystrand;H. Oeschler;S. Oh;S. Oh;A. Okatan;T. Okubo;L. Oláh;J. Oleniacz;A. C. O. D. Silva;J. Onderwaater;C. Oppedisano;A. O. Velasquez;A. Oskarsson;K. Oyama;P. Sahoo;Y. Pachmayer;M. Pachr;P. Pagano;A. Palmeri;P. Pareek;S. Parmar;A. Passfeld;V. Paticchio;B. Paul;T. Pawlak;T. Peitzmann;H. P. D. Costa;E. P. D. Oliveira;D. Peresunko;A. Pesci;V. Peskov;Y. Pestov;P. Pillot;O. Pinazza;L. Pinsky;M. Planinić;J. Pluta;S. Pochybova;P. Podesta-Lerma;M. Poghosyan;B. Polichtchouk;N. Poljak;S. Porteboeuf-Houssais;S. Prasad;R. Preghenella;F. Prino;I. Pshenichnov;M. Puccio;J. Putschke;H. Qvigstad;A. Rachevski;A. Rakotozafindrabe;S. Raniwala;B. T. Rascanu;D. Rathee;K. Redlich;A. Rehman;F. Reidt;R. Renfordt;K. Reygers;V. Riabov;R. Ricci;T. Richert;A. Rivetti;D. Rohr;P. Rosnet;F. Roukoutakis;A. Roy;C. Roy;P. Roy;S. Sahoo;J. Saini;S. Sakai;J. Salzwedel;S. Sambyal;V. Samsonov;A. Sandoval;F. Scarlassara;R. Schicker;E. Serradilla

6 使用大型强子对撞机上的 AL8 ICE 探测器，在质心能量 √ s = 7 TeV 的最小偏置质子-质子碰撞中测量带电射流横截面、射流碎片分布和射流形状的差异。使用顺序重组 kT 和反 kT 以及 SISCone 射流寻找算法 10 算法，根据中速 9 区域中的带电粒子动量重建射流，其中多个分辨率参数在 R = 0.2 – 0.6 范围内。用三个射流探测器测量的 11 个截面的差动射流产生在 12 个区间 20 < p T < 100 GeV/c 中的横向动量 (pT) 一致。它们也与 ATLAS 合作在 13 LHC 上进行的先前测量结果一致。射流带电粒子多重性随着射流 pT 的增加而单调上升 14，与先前在较低能量下的观察结果定性一致。使用径向动量密度分布以及包含 80% (<R80>) 重建射流 pT 的平均半径分布来研究领先射流的横向 15 个剖面。使用射流成分的缩放 pT 谱研究了 R = 0.4 的主要射流的破碎 17。将测量结果与事件生成器（PYTHIA、PHOJET、HERWIG）的模型计算进行比较。 19 PYTHIA 20 模型（调 Perugia-2011）很好地描述了测得的径向密度分布和 <R80> 分布。 HERWIG 更好地描述了碎片分布。 21 *参见附录 A 合作成员名单 CERN-PH-EP-2014-254 2014 年 10 月 8 日 7 TeV 下的带电射流特性（以 pp 为单位） ALICE 合作

6 The differential charged jet cross sections, jet fragmentation distributions, and jet shapes are mea7 sured in minimum bias proton-proton collisions at centre-of-mass energy √ s = 7 TeV using the AL8 ICE detector at the LHC. Jets are reconstructed from charged particle momenta in the mid-rapidity 9 region using the sequential recombination kT and anti-kT as well as the SISCone jet finding algo10 rithms with several resolution parameters in the range R = 0.2 – 0.6. Differential jet production cross 11 sections measured with the three jet finders are in agreement in the transverse momentum (pT) in12 terval 20 < p T < 100 GeV/c. They are also consistent with prior measurements carried out at 13 the LHC by the ATLAS collaboration. The jet charged particle multiplicity rises monotonically with 14 increasing jet pT, in qualitative agreement with prior observations at lower energies. The transverse 15 profiles of leading jets are investigated using radial momentum density distributions as well as distri16 butions of the average radius containing 80% (〈R80〉) of the reconstructed jet pT. The fragmentation 17 of leading jets with R = 0.4 using scaled pT spectra of the jet constituents is studied. The measure18 ments are compared to model calculations from event generators (PYTHIA, PHOJET, HERWIG). 19 The measured radial density distributions and 〈R80〉 distributions are well described by the PYTHIA 20 model (tune Perugia-2011). The fragmentation distributions are better described by HERWIG. 21 ∗See Appendix A for the list of collaboration members CERN-PH-EP-2014-254 08 October 2014 Charged jet properties in pp at 7 TeV The ALICE Collaboration

Charged jet cross sections and properties in proton- proton collisions at √s = 7 TeV

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