Explaining the lepton non-universality at the LHCb and CMS within a unified framework

Journal of High Energy Physics, Feb 2015

Sanjoy Biswas, Debtosh Chowdhury, Sangeun Han, Seung J. Lee

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Explaining the lepton non-universality at the LHCb and CMS within a unified framework

Received: September Explaining the lepton non-universality at the LHCb Sanjoy Biswas 0 1 4 6 7 8 Debtosh Chowdhury 0 1 4 7 8 Sangeun Han 0 1 2 5 7 8 Seung J. Lee 0 1 3 5 7 8 0 335 Gwahak-ro , Yuseong-gu, Daejeon 305-701 , Korea 1 Piazzale Aldo Moro 2 , I-00185 Rome , Italy 2 Center for Theoretical Physics of the Universe , IBS 3 School of Physics, Korea Institute for Advanced Study 4 Istituto Nazionale di Fisica Nucleare , Sezione di Roma 5 Department of Physics, Korea Advanced Institute of Science and Technology 6 Dipartimento di Fisica, Universit`a di Roma La Sapienza 7 Open Access , c The Authors 8 [81] J. Alwall, M. Herquet , F. Maltoni, O. Mattelaer and T. Stelzer, MadGraph 5: going beyond The recent results from the LHCb in the context of (B+ and the CMS analysis in the context of right handed W -boson (WR) search show a 2.6 and a 2.8 deviations from the Standard Model expectations respectively. In this work, we address these two seemingly uncorrelated results in the context of R-parity violating supersymmetry. We found that a particular combination of LQDc-type operators which successfully explain the LHCb result, can also accommodate the CMS excess in the eejj ArXiv ePrint: 1409.0882 Supersymmetry; Hadron-Hadron Scattering; Beyond Standard Model; B - channel of the WR search. physics, Rare decay 1 Introduction 2 3 4 Model: RPV SUSY Lepton non-universality at the LHCb Lepton non-universality at the CMS Results and discussion The recent LHCb measurement has observed [1] a significant deviation from the standard low invariat mass region (1 GeV2 of 3 fb1 integrated luminosity. M`` 6 GeV2) of the di-lepton pair using a data set More interestingly, CMS analysis for the right-handed W -boson (WR) search has also come up with a significant deviation from the standard model expectation [3]. The CMS search uses pp collision data at the Large Hadron Collider (LHC) at a center of mass enhas also reported a possible excess in the context of the di-leptoquark search [4]. The There have already been quite a few studies in an attempt to explain these results separately assuming different models. In ref. [5], the authors studied the observed value of RK in the context of effective operator approach, illustrated with two leptoquark models. They also mentioned that the leptoquark couplings considered there, can correspond to certain R-parity violating (RPV) supersymmetric scenario. However the flavor structure of those couplings can not address the CMS eejj excesses. Certain constraints have been put on these effective operators in [6]. On the other hand, the CMS excess in the context of both WR and di-leptoquark search is interpreted in [7] with a resonant coloron production and further decay of the coloron into a pair of leptoquark and in [8], with resonant production of vector like leptons via W 0 /Z0 vector boson. A similar analysis [9] with W 0 /Z0 has been performed in the context of WR search. Refs. [10, 11] showed that the WR excess can be explained within the context of GUT models. Within the framework of R-parity violating supersymmetry (SUSY) an explanation via resonant slepton production has been provided in [12] in the context of CMS WR search. In ref. [13] the di-leptoquark excess is explained. Though it is quite preliminary to jump into any conclusion before a more detailed analysis of the data and despite of the fact that the statistics is very low in the case of CMS analyses, one can still take these deviations at their face value in order to ensure a better search strategies either to claim a discovery or to put an exclusion limit. It is worth noting that while there are individual explanations for each of these results mentioned above, so far there has been no attempt to have explain both simultaneously. In this article we present a unified framework which can accommodate both the LHCb and the CMS WR search results in the context of the RPV minimal supersymmetric standard model (MSSM). Given the fact that the deviation in the measured value of RK can be consistent with new physics (NP) either in the electron or in the muon sector due to the large theoretical uncertainties present in the SM expectations, in this article, we focus on the former possibility motivated by the observed CMS excess. The remaining of the paper is organized as follows: in section 2, we give a brief account of the RPV model. Section 3 describes both the B-physics and collider consequences of this model. Finally, we summarize our results and conclude in section 4. Model: RPV SUSY In this section, we will give a brief review of R-parity violating SUSY scenario. While R-parity conserving SUSY has many judicious features, which made it one of the most popular frameworks, R-parity violating SUSY [1418] provides an alternative. It can relax the naturalness bound from LHC due to the absence of large missing transverse energy (ET ) signature and at the same time provides rich collider phenomenology. In MSSM, the RP (...truncated)


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Sanjoy Biswas, Debtosh Chowdhury, Sangeun Han, Seung J. Lee. Explaining the lepton non-universality at the LHCb and CMS within a unified framework, Journal of High Energy Physics, 2015, pp. 142, Volume 2015, Issue 2, DOI: 10.1007/JHEP02(2015)142