2HDM四零Yukawa纹理：最新CKM矩阵下的夸克部门分析

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本文研究的是在二希格斯双倍态模型(2HDM)的背景下，利用最新的卡比博-凯克曼-马沙克矩阵(CKM matrix)数据对具有四零Yukawa纹理的夸克部门进行分析。Yukawa纹理是一种假设，用于描述夸克与其他基本粒子间的相互作用强度，其中某些元素被设置为零，这有助于简化理论并可能提供对物理现象的更深层次理解。研究者采用了一个特定的四零Yukawa ansatz，这是对 Cheng 和 Sher ansatz 的扩展，它直接源于费米子质量矩阵的不变性。这样做的目的是为了减轻带电希格斯交换引起的较大味觉（flavor）违反问题。通过对非对角项的约束，特别是考虑了主要味道的限制，他们能够得到Yukawa矩阵Y–1,2q的紧凑表达式。通过基于当前实验数据，特别是夸克的质量以及 Cabibbo-Kobayashi-Maskawa (CKM) 混合矩阵的数据，进行了详细的拟合分析。这项工作旨在确定 tanδ (可能是模型中的一个参数) 对Y–1,2q允许范围的影响，并与文献中关于中性流改变的实验约束相比较。结果表明，他们的分析结果与现有约束条件下的界限是一致的。本文的重要贡献在于将理论分析与实际观测相结合，提供了2HDM中具有四零Yukawa纹理的夸克部门的新见解，这不仅有助于深化对基本粒子相互作用的理解，还为模型的参数化和预测提供了实证支持。此外，研究方法和结果对于探索其他类似理论模型，如超对称或额外维度模型，都具有参考价值。这篇文章对于理解和应用2HDM在粒子物理学中的角色具有重要意义。

Physics Letters B 742 (2015) 347–352

Contents lists available at ScienceDirect

Physics Letters B

www.elsevier.com/locate/physletb

Analysis of the quark sector in the 2HDM with a four-zero Yukawa

texture using the most recent data on the CKM matrix

O. Félix-Beltrán

, F. González-Canales

a,b

, J. Hernández-Sánchez

a,c,∗

, S. Moretti

d,e

R. Noriega-Papaqui

c,f

, A. Rosado

Facultad de Ciencias de la Electrónica, Benemérita Universidad Autónoma de Puebla, Apdo. Postal 542, C.P. 72570 Puebla, Pue., Mexico

Instituto de Física Corpuscular (CSIC – Universidad de Valencia), Spain

Dual C-P Institute of High Energy Physics, Mexico

School of Physics and Astronomy, University of Southampton, Highﬁeld, Southampton SO17 1BJ, United Kingdom

Particle Physics Department, Rutherford Appleton Laboratory, Chilton, Didcot, Oxon OX11 0QX, United Kingdom

Área Académica de Matemáticas y Física, Universidad Autónoma del Estado de Hidalgo, Carr. Pachuca-Tulancingo Km. 4.5, C.P. 42184, Pachuca, Hgo., Mexico

Instituto de Física, Benemérita Universidad Autónoma de Puebla, Apdo. Postal J-48, C.P. 72570 Puebla, Pue., Mexico

a r t i c l e i n f o a b s t r a c t

Article history:

Received

10 December 2013

Received

in revised form 20 October 2014

Accepted

2 February 2015

Available

online 4 February 2015

Editor:

B. Grinstein

Keywords:

Higgs

physics

Flavour

physics

In this Letter we analyse, in the context of the general 2-Higgs Doublet Model, the structure of the

Yukawa matrices,



, by assuming a four-zero texture ansatz for their deﬁnition. In this framework, we

obtain compact expressions for



, which are reduced to the Cheng and Sher ansatz with the difference

that they are obtained naturally as a direct consequence of the invariants of the fermion mass matrices.

Furthermore, in order to avoid large ﬂavour violating effects coming from charged Higgs exchange, we

consider the main ﬂavour constraints on the off-diagonal terms of Yukawa texture







(k = l). We

perform a χ

-ﬁt based on current experimental data on the quark masses and the Cabibbo–Kobayashi–

Maskawa

mixing matrix V

CKM

. Hence, we obtain the allowed ranges for the parameters



at 1σ for

several values of tan β. The results are in complete agreement with the bounds obtained taking into

account constraints on Flavour Changing Neutral Currents reported in the literature.

(http://creativecommons.org/licenses/by/4.0/). Funded by SCOAP

1. Introduction

Now that a Higgs particle has been discovered at the Large

Hadron Collider (LHC) [1–3], with properties in very good accor-

dance

with the minimal version of Standard Model (SM) [4–6], it

becomes important to look for extensions of the Higgs sector be-

yond

the SM structure that contain a neutral Higgs boson similar

to the one found at the CERN machine. One of the most restric-

tive

experimental results on extensions of the SM is that Flavour

Changing Neutral Currents (FCNCs) must be controlled. The highly

experimental suppression for FCNCs should be a test for models

with more than one Higgs multiplet. In particular, in the 2-Higgs

Doublet Model (2HDM) [7–9], FCNCs could be avoided through a

Corresponding author.

E-mail

addresses: olga_ﬂix@ece.buap.mx (O. Félix-Beltrán),

felixfcoglz@gmail.com (F. González-Canales), jaime.hernandez@correo.buap.mx

(J. Hernández-Sánchez),

s.moretti@soton.ac.uk (S. Moretti), rnoriega@uaeh.edu.mx

(R. Noriega-Papaqui),

rosado@ifuap.buap.mx (A. Rosado).

discrete symmetry Z

. It is well known that there are several ver-

sions

of this model, known as Type I, II, X and Y (2HDM-I [10,

11],

2HDM-II [12], 2HDM-X and 2HDM-Y [13–18]) or inert [19–22].

The most general version of the 2HDM contains non-diagonal

fermionic couplings in the scalar sector implying the generation

of unwanted FCNCs. Different ways to suppress FCNCs have been

developed, giving rise to a variety of speciﬁc implementations of

the 2HDM [23–27]. In particular, as it is done in Ref. [28], it is

possible to analyse the Yukawa matrices through the quark sector

phenomenology. The Cheng and Sher ansatz [29] has been suc-

cessfully

used to describe the Yukawa couplings. Several Yukawa

textures proposed in literature [30,31] have yielded the right de-

scription

of the Yukawa couplings depending on fermion masses.

this paper, we are interested in the Yukawa sector in the

context of the general version of the 2HDM considering a four-

zero

texture fermionic mass matrix [30,31]. This Yukawa texture

has been studied in Refs. [32–36], which obtained interesting phe-

nomenological

results in both charged and neutral Higgs sectors.

In this framework, we propose an alternative way to determine

http://dx.doi.org/10.1016/j.physletb.2015.02.003

0370-2693/

SCOAP

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