TeV右 handed模odel:统一与暗物质的全新探索

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本文主要探讨的是TeV铁离子暗物质与统一模型的左右对称理论，即在左-right模型的框架下，研究具有TeV能量尺度（TeVeV级别）的右-handed粒子与标准模型的相互作用。在这个模型中，核心理念是结合了左手（左手螺旋）和右手（右手螺旋）对称性，以及打破D-parity（空间反演对称性的自发破缺）。D-parity的破裂使得模型中的暗物质成分得以存在，并且允许物理现象在左右两侧产生不同的行为。作者Triparno Bandyopadhyay和Amitava Raychaudhuri来自加尔各答大学物理学系，他们详细地构建了一个模型，其中右手中的SU(2)R自共轭费米子扮演关键角色，它们有助于实现标准模型中不同力的耦合统一。这种统一对于理论的预测性和一致性至关重要，因为它可以简化基本力之间的关系，提高理论的解释力。论文探讨了这个模型中的暗物质特性。由于暗物质在宇宙中占据了大约27%的质量成分，寻找其粒子并理解其性质是现代物理学的重要目标之一。在本文中，作者考察了如何通过这个左-right模型来解释暗物质的存在，可能的暗物质候选者以及其与标准模型粒子的相互作用。这可能包括弱相互作用、强相互作用或引力之外的新作用。此外，论文还讨论了模型的潜在实验验证途径，特别是对撞机（如LHC）可能观察到的信号。由于暗物质不直接参与电磁相互作用，对撞机上的观测可能会通过间接方式，如通过其与标准模型粒子的碰撞产物来揭示暗物质的存在痕迹。这些碰撞可能会产生特殊类型的粒子组合或者能量分布特征，这些将是探测和确认这一理论的关键线索。这篇开放获取的文章深入剖析了TeV铁离子暗物质与统一模型的左-right结构，强调了模型设计的目的，暗物质的物理意义，以及对当前和未来粒子物理实验的潜在贡献。通过这种理论与实验的结合，它不仅推进了我们对基本粒子物理的理解，也为暗物质研究领域提供了新的思考方向。

Physics Letters B 771 (2017) 206–212

Contents lists available at ScienceDirect

Physics Letters B

www.elsevier.com/locate/physletb

Left–right model with TeV fermionic dark matter and uniﬁcation

Triparno Bandyopadhyay

∗

, Amitava Raychaudhuri

Department of Physics, University of Calcutta, 92 Acharya Prafulla Chandra Road, Kolkata 700009, India

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

Article history:

Received

2 April 2017

Received

in revised form 12 May 2017

Accepted

15 May 2017

Available

online 19 May 2017

Editor:

A. Ringwald

The ingredients for a model with a TeV right-handed scale, gauge coupling uniﬁcation, and suitable

dark matter candidates lie at the heart of left–right symmetry with broken D-parity. After detailing

the contents of such a model, with SU(2)

self-conjugate fermions at the right-handed scale aiding

in uniﬁcation of couplings, we explore its dark matter implications and collider signatures.

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

1. Introduction

These are indeed exciting times for particle physics as the Large

Hadron Collider (LHC) at CERN is all set to run at its machine

conﬁguration of

√

s = 14 TeV. With experiments at this highest

energy facility in a hunt for new physics at TeV scales, it is no sur-

prise

that the community is particularly focussed on models with

phenomenological signatures in the O(TeV) range. Of the various

models that try to explain natural phenomena beyond the scope

of the standard model (SM), those based on left–right (LR) sym-

metry

[1–4] have withstood the tests of time as they extend the

SM electroweak sector in well motivated ways. These models ex-

plain

the origin of parity violation and at the same time gauge the

global U(1)

(B−L)

symmetry inherent in SM and in the process ex-

plain

the smallness of the neutrino mass.

Hypothesised primarily in the context of visible sector physics,

LR models do not have any de facto dark matter (DM) candidate

built into their bare bones structure. However, the group theoretic

conﬁguration of LR symmetry has the provision of a naturally aris-

ing

discrete symmetry, remnant after the spontaneous breaking of

U (1)

(B−L)

[5–10], which facilitates the building of a plethora of DM

models [11–16].

The

LR gauge symmetry and particle content, along with gauge

coupling uniﬁcation (GCU), can be embedded in SO(10) “grand

uniﬁed theories” (GUTs) [17,18] having numerous desired features

such as quark–lepton uniﬁcation, uniﬁcation of the SM interac-

tions,

and explanation of the arbitrary U(1)

assignment of the

SM, among others. However, in models with the left–right symme-

try

breaking scale M

∼ O(TeV), and a minimal scalar sector, GCU

Corresponding author.

E-mail

addresses: gondogolegogol@gmail.com (T. Bandyopadhyay),

palitprof@gmail.com (A. Raychaudhuri).

is impossible [19–24]. To achieve uniﬁcation one either needs to

add scalar multiplets redundant to their primary function of sym-

metry

breaking and mass generation, or larger symmetries inter-

mediate

between the Left–Right symmetry (LRS) and GUT scales.

These modiﬁcations end up introducing additional scalar ﬁne tun-

ings

and a degree of arbitrariness.

this letter, we show that the three requirements of O(TeV)

right-handed breaking scale, uniﬁcation of LRS couplings, and the

presence of a suitable dark matter candidate can be achieved with

a single stroke by the careful appraisal of fermion masses in a

class of left–right models where the exact L ↔ R symmetry is

spontaneously broken at a scale different from the one where the

right-handed gauge symmetry is broken [25,26]. While focussing

on model mechanics, we discuss dark matter phenomenology and

show that though its direct detection prospects are not bright, the

collider signatures of the model are testable.

2. Model

The left–right symmetry is deﬁned by the gauge group,

(3)

× SU(2)

× U (1)

(B−L)

, and a discrete SU(2)

↔

SU(2)

symmetry, P. Under this, the SM quarks, leptons, and a

right-handed (RH) neutrino of one family transform as:

≡ (1

, 2

, 1

, −1

(B−L)

); l

≡ (1

, 1

, 2

, −1

(B−L)

);

≡ (3

, 2

, 1

, 1/3

(B−L)

); q

≡ (3

, 1

, 2

, 1/3

(B−L)

) ; (1)

with (B − L) being normalised by the relation:

= T

+ T

B − L

. (2)

The scalar sector is given by:

 ≡ (1

, 2

, 0

(B−L)

); η ≡ (1

, 1

, 0

(B−L)

);



≡ (1

, 1

, 3

, 2

(B−L)

); 

≡ (1

, 3

, 1

, 2

(B−L)

). (3)

http://dx.doi.org/10.1016/j.physletb.2017.05.042

0370-2693/

SCOAP

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