The Dirac neutrino masses could be simply generated by a neutrinophilic scalar doublet with a vacuum being dramatically different from the electroweak one.While the case with an eV-scale vacuum has been widely explore...The Dirac neutrino masses could be simply generated by a neutrinophilic scalar doublet with a vacuum being dramatically different from the electroweak one.While the case with an eV-scale vacuum has been widely explored previously,we exploit in this work the desert where the scalar vacuum is of O(keV)scale.In this regime,there would be rare hope to probe the keV-vacuum neutrinophilic scalar model via the lepton-flavor-violating processes,which makes it distinguishable from the widely considered eV-scale vacuum.Although such a keV-vacuum scenario is inert in the low-energy flavor physics,we show that the baryogenesis realized via the lightest Dirac neutrino can be a natural candidate in explaining the baryon asymmetry of the Universe.Furthermore,the Dirac neutrinos with a keV-vacuum scalar can generate a shift of the effective neutrino number within the range 0.097≤ΔN_(eff)≤0.112,which can be probed by the future Simons Observatory experiments.In particular,the model with a minimal valueΔN_(eff)=0.097 can already be falsified by the future CMB Stage-Ⅳand Large Scale Structure surveys,providing consequently striking exploratory avenues in the cosmological regime for such a keV-vacuum scenario.展开更多
Updated measurements from the LHCb and SHoES collaborations have respectively strengthened the de-viations of the ratio R_(K)in rare semi-leptonic B-meson decays and the present-day Hubble parameter H_(0)in the Uni-ve...Updated measurements from the LHCb and SHoES collaborations have respectively strengthened the de-viations of the ratio R_(K)in rare semi-leptonic B-meson decays and the present-day Hubble parameter H_(0)in the Uni-verse,implying tantalizing hints of new physics beyond the standard model.In this paper,we consider a simple fla-vor-specific two-Higgs-doublet model,where long-standing R_(K(*))anomalies can be addressed by a one-flavor right-handed neutrino.An intriguing prediction resulting from the parameter space for the R_(K(*))resolution under flavor and clliderphysics constraints points toward a shift in the efective neutrino number,ON_(eff)=N_(eff)-N_(eff)^(SM),as a-favored way to ease the H_(0)tension.Depending on whether the neutrino is of the Dirac or Majorana type,we show that the resulting shift is △N_(eff)■1.0 for the former case and △N_(eff)■0.5 for the latter case.While the Dirac case is disfavored by the CMB polarization measurements,the Majorana solution is consistent with recent studies using a combined dataset from various sources.Consequently,such a simple flavor-specific two-Higgs-doublet model provides a link between R_(K(*)) anomalies and H_(0) tension,which in turn can be readily verified or disproved by up-comingmeasurements.展开更多
目的比较股骨近端防旋髓内钉(proximal femoral nail anti-rotation,PFNA)和动力髋螺钉(dynamic hip screw,DHS)治疗老年骨质疏松患者合并粗隆间骨折的临床疗效。方法选取2011年12月—2014年12月患有骨质疏松合并粗隆间骨折老年患者共72...目的比较股骨近端防旋髓内钉(proximal femoral nail anti-rotation,PFNA)和动力髋螺钉(dynamic hip screw,DHS)治疗老年骨质疏松患者合并粗隆间骨折的临床疗效。方法选取2011年12月—2014年12月患有骨质疏松合并粗隆间骨折老年患者共72例,根据手术所选内固定的不同分为PFNA组(38例)和DHS组(34例)。对手术时间、术中失血量、术后负重时间、术后髋关节Harris评分等指标进行组间对比分析。结果所有患者均获随访,随访时间5~24个月(平均13.5个月)。PFNA组手术时间[(40.25±24.23)min]短于DHS组[(72.65±34.65)min],术中失血量[(136±56)m L]低于DHS组[(256±102)m L],术后负重时间[(5.24±4.52)d]早于DHS组[(15.69±6.78)d],术后髋关节Harris评分[(80.23±10.26分)]高于DHS组[(54.75±12.37分)],差异均有统计学意义(P<0.05)。结论对于老年骨质疏松伴有粗隆间骨折患者,采用PFNA治疗手术时间短,创伤小,髋关节功能恢复优于DHS治疗,术后可使患者早期负重,从而提高生活质量。展开更多
基金Supported by the National Natural Science Foundation of China(12135006,12075097,12047527,11775092)by the Fundamental Research Funds for the Central Universities(CCNU20TS007,CCNU19TD012,CCNU22LJ004)。
文摘The Dirac neutrino masses could be simply generated by a neutrinophilic scalar doublet with a vacuum being dramatically different from the electroweak one.While the case with an eV-scale vacuum has been widely explored previously,we exploit in this work the desert where the scalar vacuum is of O(keV)scale.In this regime,there would be rare hope to probe the keV-vacuum neutrinophilic scalar model via the lepton-flavor-violating processes,which makes it distinguishable from the widely considered eV-scale vacuum.Although such a keV-vacuum scenario is inert in the low-energy flavor physics,we show that the baryogenesis realized via the lightest Dirac neutrino can be a natural candidate in explaining the baryon asymmetry of the Universe.Furthermore,the Dirac neutrinos with a keV-vacuum scalar can generate a shift of the effective neutrino number within the range 0.097≤ΔN_(eff)≤0.112,which can be probed by the future Simons Observatory experiments.In particular,the model with a minimal valueΔN_(eff)=0.097 can already be falsified by the future CMB Stage-Ⅳand Large Scale Structure surveys,providing consequently striking exploratory avenues in the cosmological regime for such a keV-vacuum scenario.
基金Supported by the National Natural Science Foundation of China(12135006,12075097,11675061,11775092)the Fundamental Research Funds for the Central Universities(CCNU20TS007,CCNU19TD012,CCNU22LJ004)。
文摘Updated measurements from the LHCb and SHoES collaborations have respectively strengthened the de-viations of the ratio R_(K)in rare semi-leptonic B-meson decays and the present-day Hubble parameter H_(0)in the Uni-verse,implying tantalizing hints of new physics beyond the standard model.In this paper,we consider a simple fla-vor-specific two-Higgs-doublet model,where long-standing R_(K(*))anomalies can be addressed by a one-flavor right-handed neutrino.An intriguing prediction resulting from the parameter space for the R_(K(*))resolution under flavor and clliderphysics constraints points toward a shift in the efective neutrino number,ON_(eff)=N_(eff)-N_(eff)^(SM),as a-favored way to ease the H_(0)tension.Depending on whether the neutrino is of the Dirac or Majorana type,we show that the resulting shift is △N_(eff)■1.0 for the former case and △N_(eff)■0.5 for the latter case.While the Dirac case is disfavored by the CMB polarization measurements,the Majorana solution is consistent with recent studies using a combined dataset from various sources.Consequently,such a simple flavor-specific two-Higgs-doublet model provides a link between R_(K(*)) anomalies and H_(0) tension,which in turn can be readily verified or disproved by up-comingmeasurements.
文摘目的比较股骨近端防旋髓内钉(proximal femoral nail anti-rotation,PFNA)和动力髋螺钉(dynamic hip screw,DHS)治疗老年骨质疏松患者合并粗隆间骨折的临床疗效。方法选取2011年12月—2014年12月患有骨质疏松合并粗隆间骨折老年患者共72例,根据手术所选内固定的不同分为PFNA组(38例)和DHS组(34例)。对手术时间、术中失血量、术后负重时间、术后髋关节Harris评分等指标进行组间对比分析。结果所有患者均获随访,随访时间5~24个月(平均13.5个月)。PFNA组手术时间[(40.25±24.23)min]短于DHS组[(72.65±34.65)min],术中失血量[(136±56)m L]低于DHS组[(256±102)m L],术后负重时间[(5.24±4.52)d]早于DHS组[(15.69±6.78)d],术后髋关节Harris评分[(80.23±10.26分)]高于DHS组[(54.75±12.37分)],差异均有统计学意义(P<0.05)。结论对于老年骨质疏松伴有粗隆间骨折患者,采用PFNA治疗手术时间短,创伤小,髋关节功能恢复优于DHS治疗,术后可使患者早期负重,从而提高生活质量。
