Abstract

Using the data collected by the CMS experiment at the Large Hadron Collider in collisions of protons with a center-of-mass energy of 8 TeV, excited P-wave states \({\text{B}}_{{{\text{s}}2}}^{ * }{{(5840)}^{0}}\) and B_s1(5830)⁰ of the \({\text{B}}_{{\text{s}}}^{0}\) meson are studied. The decay \({\text{B}}_{{{\text{s}}2}}^{ * }{{(5840)}^{0}} \to {{{\text{B}}}^{0}}{\text{K}}_{{\text{s}}}^{0}\) is observed for the first time, the first indication of the \({\text{B}}_{{{\text{s1}}}}^{ * }{{(5840)}^{0}} \to {\text{B}}_{{}}^{{ * 0}}{\text{K}}_{{\text{s}}}^{0}\) decay existence is obtained, the probabilities of these decays with respect to the corresponding decays into B⁽*⁾⁺\({\text{K}}_{{}}^{ - }\) are measured. B⁰ and B⁺ ground states are reconstructed using \({{{\text{B}}}^{0}} \to {\text{J/}}\psi {{{\text{K}}}^{ + }}{{\pi }^{ - }}\) and \({{{\text{B}}}^{ + }} \to {\text{J/}}\psi {{{\text{K}}}^{ + }}\) decays. Masses of P-wave \({\text{B}}_{{\text{s}}}^{0}\) mesons and the natural width of the \({\text{B}}_{{{\text{s}}2}}^{ * }{{(5840)}^{0}}\) meson are measured; the mass difference \(M({\text{B}}{{{\text{*}}}^{0}}) - M({\text{B}}{{{\text{*}}}^{ + }})\) between charged and neutral B* mesons is determined for the first time.

中文翻译：

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在CMS实验中研究$$ {\ text {B}} _ {{{\ text {s}} 2}} ^ {*} $$（5840）0和B s1（5830）0介子

摘要

使用CMS在大型强子对撞机实验中收集的数据，在质子能量为8 TeV的质子碰撞中，激发的P波态\（{\ text {B}} _ {{\ text { S}} 2}} ^ {*} {{（5840）} ^ {0}} \）和B _S1（5830）⁰的\（{\文本{B}} _ {{\文本{S}}研究} ^ {0} \）介子。衰减\ {{\ text {B}} _ {{{\ text {s}} 2}} ^ {*} {{（5840）} ^ {0}} \到{{{\ text {B}} }} {{0}} {\ text {K}} _ {{\ text {s}}} ^ {0} \）首次被观察到，这是\（{\ text {B}} _ {{{\ text {s1}}}} ^ {*} {{（（5840）} ^ {0}} \ to {\ text {B}} _ {{}} ^ {{* 0}} {\文本{K}} _ {{\文本{s}}} ^ {0} \）获得了衰减的存在，测量了这些衰减相对于相应的衰减成B ^（ * ^）+ \（{\ text {K}} _ {{}} ^ {-} \）的概率。使用\（{{{\ text {B}}} ^ {0}} \ to {\ text {J /}} \ psi {{{\ text {K}}} ^重建B ⁰和B ⁺基态{+}} {{\ pi} ^ {-}} \）和\（{{{text {B}}} ^ {+}} \至{\ text {J /}} \ psi {{{\ text {K}}} ^ {+}} \）衰减。的群众P -wave \（{\文本{B}} _ {{\文本{S}}} ^ {0} \）介子和的自然宽度的\（{\文本{B}} _ {{{ \ text {s}} 2}} ^ {*} {{（5840）} ^ {0}} \）介子；质量差\（M（{\ text {B}} {{{\ text {*}}} ^ {0}}）-M（{\ text {B}} {{{\ text {*}}} ^^ + }}）\）是第一次确定带电和中性B *介子之间。