Well-motivated electroweak dark matter is often hosted by an extended electroweak sector that also contains new lepton pairs with masses near the weak scale.In this study,we explore such electroweak dark matter by com...Well-motivated electroweak dark matter is often hosted by an extended electroweak sector that also contains new lepton pairs with masses near the weak scale.In this study,we explore such electroweak dark matter by combining dark matter direct detection experiments and high-luminosity LHC probes of new lepton pairs.Using Z- and W-associated electroweak processes with two or three lepton final states,we show that depending on the overall coupling constant,dark matter masses of up to 170−210 GeV can be excluded at the 2σ level and those up to 175−205 GeV can be discovered at the 5σ level at the 14 TeV LHC with integrated luminosities of 300 fb^−1 and 3000 fb^−1,respectively.展开更多
As part of a recent analysis of exclusive two-photon production of W＋W- pairs at the LHC, the CMS experiment used di-lepton data to obtain an ＂effective＂ photon-photon luminosity. We show how the CMS analysis on th...As part of a recent analysis of exclusive two-photon production of W＋W- pairs at the LHC, the CMS experiment used di-lepton data to obtain an ＂effective＂ photon-photon luminosity. We show how the CMS analysis on their 8 TeV data, along with some assumptions about the likelihood for events in which the proton breaks up to pass the selection criteria, can be used to significantly constrain the photon parton distribution functions, such as those from the CTEQ, MRST, and NNPDF collaborations. We compare the data with predictions using these photon distributions, as well as the new LUXqed photon distribution. We study the impact of including these data on the NNPDF2.3QED, NNPDF3.0QED and CT14QEDinc fits. We find that these data place a useful and complementary cross-check on the photon distribution, which is consistent with the LUXqed prediction while suggesting that the NNPDF photon error band should be significantly reduced. Additionally, we propose a simple model for describing the two-photon production of W^＋W^- at the LHC. Using this model, we constrain the number of inelastic photons that remain after the experimental cuts are applied.展开更多
基金Supported by National Natural Science Foundation of China(11775039)the Chinese Scholarship Council and the Fundamental Research Funds for the Central Universities at CQU with(cqu2017hbrc1B05)。
文摘Well-motivated electroweak dark matter is often hosted by an extended electroweak sector that also contains new lepton pairs with masses near the weak scale.In this study,we explore such electroweak dark matter by combining dark matter direct detection experiments and high-luminosity LHC probes of new lepton pairs.Using Z- and W-associated electroweak processes with two or three lepton final states,we show that depending on the overall coupling constant,dark matter masses of up to 170−210 GeV can be excluded at the 2σ level and those up to 175−205 GeV can be discovered at the 5σ level at the 14 TeV LHC with integrated luminosities of 300 fb^−1 and 3000 fb^−1,respectively.
基金Supported by the U.S.National Science Foundation(PHY-1417326,PHY-1719914)the National Natural Science Foundation of China(11465018)
文摘As part of a recent analysis of exclusive two-photon production of W＋W- pairs at the LHC, the CMS experiment used di-lepton data to obtain an ＂effective＂ photon-photon luminosity. We show how the CMS analysis on their 8 TeV data, along with some assumptions about the likelihood for events in which the proton breaks up to pass the selection criteria, can be used to significantly constrain the photon parton distribution functions, such as those from the CTEQ, MRST, and NNPDF collaborations. We compare the data with predictions using these photon distributions, as well as the new LUXqed photon distribution. We study the impact of including these data on the NNPDF2.3QED, NNPDF3.0QED and CT14QEDinc fits. We find that these data place a useful and complementary cross-check on the photon distribution, which is consistent with the LUXqed prediction while suggesting that the NNPDF photon error band should be significantly reduced. Additionally, we propose a simple model for describing the two-photon production of W^＋W^- at the LHC. Using this model, we constrain the number of inelastic photons that remain after the experimental cuts are applied.
