New mechanisms for double charmed meson production at the LHCb

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• 作者：Rafał Maciuła^a ; ^{rafal.maciula@ifj.edu.pl" class="auth_mail" title="E-mail the corresponding author} ; Vladimir A. Saleev^b ; ^{saleev@samsu.ru" class="auth_mail" title="E-mail the corresponding author} ; Alexandra V. Shipilova^b ; ^{alexshipilova@samsu.ru" class="auth_mail" title="E-mail the corresponding author} ; Antoni Szczurek^a ; ^c ; ^{antoni.szczurek@ifj.edu.pl" class="auth_mail" title="E-mail the corresponding author}
• 刊名：Physics Letters B
• 出版年：2016
• 出版时间：10 July 2016
• 年：2016
• 卷：758
• 期：Complete
• 页码：458-464
• 全文大小：472 K

文摘

We discuss production of D⁰D⁰$D^0{D}^0$ (and ${\overline{D}}^0{\overline{D}}^0$) pairs related to the LHCb Collaboration results for $\sqrt{s}=7\text{TeV}$ in proton–proton scattering. We consider double-parton scattering (DPS) mechanisms of double $c\overline{c}$ production and subsequent 33f1071203cd0bfc69c47539cf26bb" title="Click to view the MathML source">cc→D⁰D⁰$cc\to D^0{D}^0$ hadronization as well as double g   and mixed $gc\overline{c}$ production with gg→D⁰D⁰$gg\to D^0{D}^0$ and gc→D⁰D⁰$gc\to D^0{D}^0$ hadronization calculated with the help of the scale-dependent hadronization functions of Kniehl et al. Single-parton scattering (SPS) mechanism of digluon production is also taken into account. We compare our results with several correlation observables in azimuthal angle φ_D⁰D⁰${\phi }_{D^0{D}^0}$ between D⁰$D^0$ mesons or in dimeson invariant mass M_D⁰D⁰$M_{D^0{D}^0}$. The inclusion of new mechanisms with g→D⁰$g\to D^0$ fragmentation leads to larger cross sections, than when including only DPS mechanism 33f1071203cd0bfc69c47539cf26bb" title="Click to view the MathML source">cc→D⁰D⁰$cc\to D^0{D}^0$ with standard scale-independent fragmentation functions. Some consequences of the presence of the new mechanisms are discussed. In particular a larger σ_eff${\sigma }_{eff}$ is needed to describe the LHCb data. There is a signature that σ_eff${\sigma }_{eff}$ may depend on transverse momentum of c   quarks and/or $\overline{c}$ antiquarks.