Transverse momentum dependent production cross sections of charged pions, kaons and protons produced in inclusive e+e− annihilation at s=10.58 GeV
Transverse momentum dependent production cross sections of charged pions, kaons and protons produced in inclusive
e+e−
annihilation at
s=10.58 GeV
复制标题
带电π介子、Ka介子和质子在 s=10.58 GeV 处包含 e+e− 湮灭过程中产生的横向动量相关的产生截面
作者：
R. Seidl;I. Adachi;J. Ahn;H. Aihara;D. Asner;V. Aulchenko;T. Aushev;R. Ayad;A. Bakich;V. Bansal;P. Behera;C. Beleño;M. Berger;V. Bhardwaj;T. Bilka;J. Biswal;A. Bobrov;A. Bozek;M. Bravcko;L. Cao;D. vCervenkov;A. Chen;B. Cheon;K. Chilikin;H. Cho;K. Cho;Y. Choi;S. Choudhury;D. Cinabro;S. Cunliffe;S. Carlo;Z. Dolevzal;T. Dong;Z. Dr'asal;S. Eidelman;D. Epifanov;J. Fast;T. Ferber;B. Fulsom;R. Garg;V. Gaur;N. Gabyshev;A. Garmash;M. Gelb;A. Giri;P. Goldenzweig;B. Golob;O. Grzymkowska;K. Hayasaka;H. Hayashii;W. Hou;T. Iijima;K. Inami;A. Ishikawa;R. Itoh;M. Iwasaki;Y. Iwasaki;W. Jacobs;S. Jia;Y. Jin;D. Joffe;K. Joo;T. Julius;A. B. Kaliyar;T. Kawasaki;H. Kichimi;C. Kiesling;C. Kim;D. Kim;H. Kim;J. Kim;S. Kim;P. Kodyvs;S. Korpar;D. Kotchetkov;P. Krivzan;R. Kroeger;P. Krokovny;T. Kuhr;R. Kulasiri;A. Kuzmin;Y. Kwon;K. Lalwani;J. Lange;I. Lee;J. Lee;J. Lee;S. Lee;D. Levit;C. Li;L. Li;Y. Li;L. Gioi;J. Libby;D. Liventsev;M. Lubej;T. Luo;J. Macnaughton;M. Masuda;T. Matsuda;D. Matvienko;M. Merola;K. Miyabayashi;R. Mizuk;S. Mohanty;Takashi Mori;R. Mussa;E. Nakano;T. Nakano;M. Nakao;K. Nath;Z. Natkaniec;M. Nayak;S. Nishida;K. Nishimura;S. Ogawa;H. Ono;Y. Onuki;P. Pakhlov;G. Pakhlova;B. Pal;S. Pardi;S. Park;S. Patra;S. Paul;R. Pestotnik;L. Piilonen;V. Popov;E. Prencipe;A. Rostomyan;G. Russo;Y. Sakai;M. Salehi;S. Sandilya;L. Šantelj;T. Sanuki;O. Schneider;G. Schnell;J. Schueler;C. Schwanda;Y. Seino;K. Senyo;M. Sevior;V. Shebalin;C. Shen;T. Shibata;J. Shiu;B. Shwartz;A. Sokolov;E. Solovieva;M. Starivc;Z. Stottler;M. Sumihama;T. Sumiyoshi;W. Sutcliffe;M. Takizawa;U. Tamponi;K. Tanida;Y. Tao;F. Tenchini;M. Uchida;S. Uehara;T. Uglov;Y. Unno;S. Uno;P. Urquijo;Y. Usov;R. Tonder;G. Varner;A. Vossen;E. Waheed;B. Wang;C. Wang;M. Wang;P. Wang;X. Wang;M. Watanabe;E. Won;S. Yang;H. Ye;J. Yelton;J. Yin;C. Yuan;Z. Zhang;V. Zhilich;V. Zhukova
我们报告测量的生产截面的带电π介子，K介子和质子的分数能量的函数，事件形状变量称为推力，和相对于推力轴的横向动量。这些测量访问的横向动量在碎裂过程中，这是至关重要的任何横向动量依赖的分布和碎裂功能的理解创建。横截面的低横动量部分可以很好地描述高斯在横动量一般假设，但分数能量的依赖是不平凡的，不同的强子类型有不同的高斯宽度。这些高斯的宽度随着推力的增加而减小，并表现出一个初始上升，然后下降的分数能量依赖性。π介子和K介子的宽度在不确定度范围内是相当的，而质子的宽度则要窄得多。这些单强子截面和高斯宽度是从KEKB非对称能量$e^+ e^-$对撞机上的贝儿探测器在$\Upperdance（4S）$共振处收集的558\，{\rm fb}^{-1}$数据样本中获得的。
We report measurements of the production cross sections of charged pions, kaons, and protons as a function of fractional energy, the event-shape variable called thrust, and the transverse momentum with respect to the thrust axis. These measurements access the transverse momenta created in the fragmentation process, which are of critical importance to the understanding of any transverse momentum dependent distribution and fragmentation functions. The low transverse momentum part of the cross sections can be well described by Gaussians in transverse momentum as is generally assumed but the fractional-energy dependence is non-trivial and different hadron types have varying Gaussian widths. The width of these Gaussians decreases with thrust and shows an initially rising, then decreasing fractional-energy dependence. The widths for pions and kaons are comparable within uncertainties, while those for protons are significantly narrower. These single-hadron cross sections and Gaussian widths are obtained from a $558\,{\rm fb}^{-1}$ data sample collected at the $\Upsilon(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^+ e^-$ collider.