SNSN-323-63 October 26 2022 Search for central exclusive production of top quark pairs with

2025-05-03 0 0 422.76KB 6 页 10玖币

侵权投诉

SNSN-323-63

October 26, 2022

Search for central exclusive production of top quark pairs with

the CMS and TOTEM experiments

Beatriz Ribeiro Lopes,

on behalf of the CMS and TOTEM Collaborations

DESY, Notkestraße 85, 22607 Hamburg, GERMANY

A search for central exclusive production of top quark pairs (tt) is

presented using collision data collected by CMS and CT-PPS in 2017. A

data-driven method to estimate the background from coincidences of in-

clusive events and pileup protons, as well as the development of a BDT

classiﬁer to separate the exclusive top signal from the inclusive tt back-

ground. The ﬁrst-ever upper limits on the cross section of exclusive tt are

shown.

PRESENTED AT

15th International Workshop on Top Quark Physics

Durham, UK, 4–9 September, 2022

arXiv:2210.13884v1 [hep-ex] 25 Oct 2022

1 Introduction

At the LHC, proton collisions at high center-of-mass energy typically result in the

dissociation of the protons and interaction between their partons. However, in central

exclusive production (CEP) processes, a diﬀerent mechanism occurs: the incoming

protons do not dissociate during the interaction but lose energy by exchanging high

energy photons or gluons. The energy lost in the interaction is used to create a

system of particles X. In the case of this work, X is a top quark and antiquark

pair (X = tt), as shown in Fig. 1. As a result of the interaction, the protons are

slightly deﬂected from their original path, but remain in the LHC beam pipe, and can

be tagged using dedicated near-beam detectors, such as the CMS-TOTEM Precision

Proton Spectrometer (CT-PPS) [4], described in the next section.

p

p2p

p

p2p

Figure 1: Leading diagrams for tt central exclusive production via photon fusion

(left) and gluon exchange (right). From [2].

The CEP of tt is predicted to occur at LHC with very low cross section (order

of 0.3 fb [5]). As the process is sensitive to the electroweak top-quark-photon cou-

pling, it can be used to look for new physics in Eﬀective Field Theory or anomalous

couplings frameworks [6], and may oﬀer complementary information to processes like

ttγ. Moreover, if observed in the data, it would allow for the full independent recon-

struction of the tt system, thanks to the correlation between the kinematics of the

outgoing intact protons and the central system.

This document reports the the ﬁrst-ever search for this process and the ﬁrst anal-

ysis of top quark production using CT-PPS [2]. The work was already presented in

the ICHEP2022 conference in the form of a poster, and this contribution is thus an

extended version of [3].

We have used data collected by CMS and CT-PPS in 2017 to set an upper limit

on the production cross section of CEP of tt. The tt dilepton and lepton+jets decay

modes are explored.

文档加载中……请稍候！
如果长时间未打开，您也可以点击刷新试试。

下载文档到电脑，查找使用更方便

10 玖币 0人已下载

立即下载

摘要：

SNSN-323-63October26,2022SearchforcentralexclusiveproductionoftopquarkpairswiththeCMSandTOTEMexperimentsBeatrizRibeiroLopes,onbehalfoftheCMSandTOTEMCollaborationsDESY,Notkestrae85,22607Hamburg,GERMANYAsearchforcentralexclusiveproductionoftopquarkpairs(tt)ispresentedusingcollisiondatacollectedbyCMSa...

展开>> 收起<<

SNSN-323-63 October 26 2022 Search for central exclusive production of top quark pairs with.pdf

共6页,预览2页

还剩页未读，继续阅读

声明：本站为文档C2C交易模式，即用户上传的文档直接被用户下载，本站只是中间服务平台，本站所有文档下载所得的收益归上传人(含作者)所有。玖贝云文库仅提供信息存储空间，仅对用户上传内容的表现方式做保护处理，对上载内容本身不做任何修改或编辑。若文档所含内容侵犯了您的版权或隐私，请立即通知玖贝云文库，我们立即给予删除！

SNSN-323-63 October 26 2022 Search for central exclusive production of top quark pairs with

相关推荐

开通VIP享超值会员特权

作者详情

相关内容

热门标签

举报选择: