arXiv: High Energy Physics - Phenomenology最新文献_第4页

Production of $eta_c(1S,2S)$ in $e^+ e^-$ and $p p$ collisions 在$e^+ e^-$和$p p$碰撞中$eta_c(1S,2S)$的产生

arXiv: High Energy Physics - Phenomenology Pub Date : 2020-12-09 DOI: 10.22323/1.390.0449

I. Babiarz, W. Schafer, A. Szczurek

{"title":"Production of $eta_c(1S,2S)$ in $e^+ e^-$ and $p p$ collisions","authors":"I. Babiarz, W. Schafer, A. Szczurek","doi":"10.22323/1.390.0449","DOIUrl":"https://doi.org/10.22323/1.390.0449","url":null,"abstract":"We derive the light-front wave function (LFWF) representation of the $gamma^{star} gamma^{star} to eta_{c} (1S),eta_{c}(2S)$ transition form factor $F(Q^2_1,Q^2_2)$ for two virtual photons in the initial state. For the LFWF, we use different models obtained from the solution of the Schrodinger equation for a variety of $cbar{c}$ potentials. We compare our results to the BaBar experimental data for the $eta_{c}(1S)$ transition form factor, for one real and one virtual photon. We observe that the onset of the asymptotic behaviour is strongly delayed and discuss applicability of the collinear and/or massless limit. \u0000In addition, we present a thorough analysis of $eta_{c}(1S,2S)$ quarkonia hadroproduction in $k_{perp}$-factorisation in the framework of the light-front potential approach for the quarkonium wave function. The off-shell matrix elements for the $g^{star} g^{star} to eta_{c} (1S,2S)$ vertices are derived. We discuss the importance of taking into account the gluon virtualities. We present the transverse momentum distributions of $eta_c$ for several models of the unintegrated gluon distributions. Our calculations are performed for four distinct parametrizations for the $cbar{c}$ interaction potential consistent with the meson spectra. We compare our results for $eta_{c}(1S)$ to measurements by the LHCb collaboration and present predictions for $eta_{c}(2S)$ production.","PeriodicalId":8457,"journal":{"name":"arXiv: High Energy Physics - Phenomenology","volume":"33 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76174817","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Scalar fully-heavy tetraquark states $$QQ^prime {bar{Q}} bar{Q^prime }$$ in QCD sum rules QCD求和规则中的标量全重四夸克态$$QQ^prime {bar{Q}} bar{Q^prime }$$

arXiv: High Energy Physics - Phenomenology Pub Date : 2020-12-08 DOI: 10.1140/EPJC/S10052-021-09096-7

Bo-Cheng Yang, Liang Tang, C. Qiao

引用次数: 29

Probes of the quark-gluon plasma and plasma instabilities 夸克-胶子等离子体的探测和等离子体的不稳定性

arXiv: High Energy Physics - Phenomenology Pub Date : 2020-12-07 DOI: 10.1103/PhysRevC.103.064904

Sigtryggur Hauksson, S. Jeon, C. Gale

引用次数: 4

Quarks at next-to-eikonal accuracy in the CGC: Forward quark-nucleus scattering 在CGC中接近象形精度的夸克:前向夸克-核散射

arXiv: High Energy Physics - Phenomenology Pub Date : 2020-12-07 DOI: 10.1103/PhysRevD.104.014019

T. Altinoluk, G. Beuf, A. Czajka, Arantxa Tymowska

引用次数: 24

OPE and quark-hadron duality for two-point functions of tetraquark currents in the 1/Nc expansion

arXiv: High Energy Physics - Phenomenology Pub Date : 2020-12-07 DOI: 10.1103/PHYSREVD.103.014012

W. Lucha, D. Melikhov, H. Sazdjian

引用次数: 5

Baryogenesis in the standard model and its supersymmetric extension 标准模型中的重子发生及其超对称扩展

arXiv: High Energy Physics - Phenomenology Pub Date : 2020-12-07 DOI: 10.1103/PhysRevD.103.L051705

C. S. Fong

引用次数: 3

The supersymmetric (B − L) model with three nonidentical right-handed neutrinos 具有三个不相同右手中微子的超对称(B−L)模型

arXiv: High Energy Physics - Phenomenology Pub Date : 2020-12-06 DOI: 10.1142/S0217751X2150038X

M. C. Rodriguez

引用次数: 0

Reconstruction and identification of H→WW* with high transverse momentum in the full hadronic final state 全强子终态高横动量H→WW*的重建与鉴定

arXiv: High Energy Physics - Phenomenology Pub Date : 2020-12-04 DOI: 10.1103/PHYSREVD.103.033005

Chunhui Chen

引用次数: 1

Comparison of lattice QCD+QED predictions for radiative leptonic decays of light mesons with experimental data 晶格QCD+QED对光介子辐射轻子衰变的预测与实验数据的比较

arXiv: High Energy Physics - Phenomenology Pub Date : 2020-12-03 DOI: 10.1103/PHYSREVD.103.053005

R. Frezzotti, M. Garofalo, V. Lubicz, G. Martinelli, C. Sachrajda, F. Sanfilippo, S. Simula, N. Tantalo

{"title":"Comparison of lattice \u0000QCD+QED\u0000 predictions for radiative leptonic decays of light mesons with experimental data","authors":"R. Frezzotti, M. Garofalo, V. Lubicz, G. Martinelli, C. Sachrajda, F. Sanfilippo, S. Simula, N. Tantalo","doi":"10.1103/PHYSREVD.103.053005","DOIUrl":"https://doi.org/10.1103/PHYSREVD.103.053005","url":null,"abstract":"We present a comparison of existing experimental data for the radiative leptonic decays $Ptoellnu_ellgamma$, where $P=K$ or $pi$ and $ell=e$ or $mu$, from the KLOE, PIBETA, E787, ISTRA+ and OKA collaborations with theoretical predictions based on the recent non-perturbative determinations of the structure-dependent vector and axial-vector form factors, $F_V$ and $F_A$ respectively. These were obtained using lattice QCD+QED simulations at order $O(alpha_{mathrm{em}})$ in the electromagnetic coupling. We find good agreement with the KLOE data on $Kto enu_egamma$ decays from which the form factor $F^+=F_V+F_A$ can be determined. For $Ktomunu_mugamma$ decays we observe differences of up to 3 - 4 standard deviations at large photon energies between the theoretical predictions and the data from the E787, ISTRA+ and OKA experiments and similar discrepancies in some kinematical regions with the PIBETA experiment on radiative pion decays. A global study of all the kaon-decay data within the Standard Model results in a poor fit, largely because at large photon energies the KLOE and E787 data cannot be reproduced simultaneously in terms of the same form factor $F^+$. The discrepancy between the theoretical and experimental values of the form factor $F^-=F_V-F_A$ is even more pronounced. These observations motivate future improvements of both the theoretical and experimental determinations of the structure-dependent form factors $F^+$ and $F^-$, as well as further theoretical investigations of models of \"new physics\" which might for example, include possible flavor changing interactions beyond $V - A$ and/or non-universal corrections to the lepton couplings.","PeriodicalId":8457,"journal":{"name":"arXiv: High Energy Physics - Phenomenology","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88826981","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 13

Large-Nc and renormalization group constraints on parity-violating low-energy coefficients for three-derivative operators in pionless effective field theory 无导有效场论中三导数算子违反奇偶低能量系数的大nc和重整化群约束

arXiv: High Energy Physics - Phenomenology Pub Date : 2020-12-03 DOI: 10.1103/PhysRevC.103.054004

S. Nguyen, M. Schindler, R. Springer, Jared Vanasse

引用次数: 0