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首页> 外文期刊>Physical review, D >Exclusive production of ? meson in the γ*p→?p reaction at large photon virtualities within kT-factorization approach
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Exclusive production of ? meson in the γ*p→?p reaction at large photon virtualities within kT-factorization approach

机译:独家生产? 在KT定位方法中大的光子虚拟中的γ* p→P→P中的MESON

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We apply the k T -factorization approach to the production of ? mesons in deep inelastic scattering. The helicity-conserving γ * ( T , L ) → ? impact factor is calculated for longitudinal and transverse photon polarization using ? meson distribution amplitudes. Different unintegrated gluon distributions are used in the calculations. The formalism for massless quarks/antiquarks gives too large transverse and longitudinal cross sections for photon virtualities below Q 2 ~ 8 ? ? GeV 2 . We suggest how to improve the description of the HERA data by introducing effective strange-quark masses into the formalism. We derive the corresponding impact factor for a finite quark mass by comparing to the light-cone wave function representation used in previous k T -factorization calculations and the color-dipole approaches. As a byproduct we present expressions for higher twist amplitudes as weighted integrals over the light-cone wave function. The quark mass m q ≈ 0.5 ? ? GeV allows to improve the description of both longitudinal and transverse cross sections down to Q 2 ~ 4 ? ? GeV 2 but this depends slightly on the renormalization scale used in the calculation. We also present the polarized cross section ratio σ L / σ T and the behavior of the total cross section σ tot = σ L + σ T as a function of photon virtuality.
机译:我们将K T -Factorization方法应用于生产的?深度无弹性散射的胶园。螺旋 - 节约γ*(t,l)→?利用纵向和横向光子极化计算冲击因子?介子分布幅度。计算中使用不同的未分解胶合胶分布。无大量夸克/古绿币的形式主义为Q 2〜8以下的光子虚拟提供太大的横向和纵向剖面?还GEV 2。我们建议如何通过将有效的奇怪夸克群体引入形式主义来改善英国数据的描述。通过比较先前的K T-活动化计算和颜色偶极方法使用的光锥波函数表示,我们通过比较了有限夸克质量的相应影响因子。作为副产品,我们将表达式用于更高扭曲幅度,作为在光锥波函数上的加权积分。夸克质量mq≈0.5?还GEV允许将纵向和横向截面的描述改进到Q 2〜4?还GEV 2,但这略微取决于计算中使用的重整化尺度。我们还呈现极化横截面比例σL/σt以及作为光子虚拟度的函数的总横截面σtot =σ1σ1的行为。

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