Search

The existence of a new force beyond the Standard Model is compelling because it could explain several striking astrophysical observations which fail standard interpretations. We searched for the light vector mediator of this dark force, the U boson, with the KLOE detector at the DAΦNE e+e− collider. Using an integrated luminosity of 1.54 fb−1, we studied the process e+e−→Uγ, with U→e+e−, using radiative return to search for a resonant peak in the dielectron invariant-mass distribution. We did not find evidence for a signal, and set a 90% CL upper limit on the mixing strength between the Standard Model photon and the dark photon, ε2, at 10−6–10−4 in the 5–520 MeV/c2 mass range.

We searched for evidence of a Higgsstrahlung process in a secluded sector, leading to a final state with a dark photon U and a dark Higgs boson h′, with the KLOE detector at DAΦNE. We investigated the case of h′ lighter than U, with U decaying into a muon pair and h′ producing a missing energy signature. We found no evidence of the process and set upper limits to its parameters in the range 2mμ

We have studied the vector to pseudoscalar conversion decay ϕ→ηe+e−, with η→π0π0π0, with the KLOE detector at DAΦNE. The data set of 1.7 fb−1 of e+e− collisions at s∼Mϕ contains a clear conversion decay signal of ∼31,000 events from which we measured a value of BR(ϕ→ηe+e−)=(1.075±0.007±0.038)×10−4. The same sample is used to determine the transition form factor by a fit to the e+e− invariant mass spectrum, obtaining bϕη=(1.28±0.10−0.08+0.09) GeV−2, that improves by a factor of five the precision of the previous measurement and is in good agreement with VMD expectations. Keywords: e+e− collisions, Conversion decay, Transition form factor

The absolute branching ratio of the K+→π+π−π+(γ) decay, inclusive of final-state radiation, has been measured using ∼17 million tagged K+ mesons collected with the KLOE detector at DAΦNE, the Frascati ϕ-factory. The result is:BR(K+→π+π−π+(γ))=0.05565±0.00031stat±0.00025syst a factor ≃ 5 more precise with respect to the previous result. This work completes the program of precision measurements of the dominant kaon branching ratios at KLOE. Keywords: e+e− experiments, Kaon decays

We have searched for a light vector boson U, the possible carrier of a “dark force”, with the KLOE detector at the DAΦNE e+e− collider, motivated by astrophysical evidence for the presence of dark matter in the Universe. Using e+e− collisions collected with an integrated luminosity of 239.3 pb−1, we look for a dimuon mass peak in the reaction e+e−→μ+μ−γ, corresponding to the decay U→μ+μ−. We find no evidence for a U vector boson signal. We set a 90% CL upper limit for the mixing parameter squared between the photon and the U boson of 1.6×10−5 to 8.6×10−7 for the mass region 520

Background: The objective of this study was to determine the effectiveness of the group program "parent management training" to reduce the symptoms of external disorders of children affected by attention deficit/hyperactivity disorder (ADHD). Methods: The method was semi-experimental design with pretest, posttest, control group, and follow-up was two months. Statistical population were all parents of children with ADHD in the Alborz province, who had referred from 2010 to clinic of childhood and adolescence disorders’ Dr. Maryam Dalili, and had records there. Among them 30 children aged 3-10 and their parents were selected by sampling and matched with regard to research criteria and were randomly divided into two groups of 15 people. Research tool was Rutter`s behavioral assessment questionnaire 1964 that was performed in both groups in pretest, posttest and follow-up. The Management training program for parents of Barkely 1987, included 9 session one-hour, once a week was presented to parents of experimental group, and the control group received no intervention. Data were analyzed by using one-way intra group covariance analysis. Results: Results showed that parents management training significantly has reduced the behavioral disorders symptoms and external signs including aggression, impulsivity, hyperactivity and anxiety in children with ADHA compared with the control group and pretest stage. Conclusion: Parent management training can be an effective method to treat the external symptoms of children with ADHA, and this method can be used in combination with other treatments that are performed about these children, such as drug therapy, behavioral therapy and so on.

The aim of this study is to examine the effect of self-instruction techniques on reading performance of students with medium dyslexic and depression symptoms . From a sample of the students of the third and forth grades of public primary schools, 32 students were randomly selected and assigned to the two experimental and control groups. The experiment group practiced the self-instruction techniques for 12 sessions, while the students in the control group continued their ordinary school activities. In the experiment group the students' parents (i.e. mother) were also trained for six sessions to help their children at home. The data were evaluated through covariance analysis. The results indicated that the self-instruction techniques are effective on the improvement of reading performance of students and the reduction of depression symptoms. After 5 months, the results of follow up studies revealed that although student marks in the experiment group have decreased to some extent, the difference between experiment and control groups is significant.

As an ex post facto research, it aimed to study the effects of similarity and dissimilarity of introversion/ extroversion personality characteristics of married couples on their marital satisfaction. The sample studied composed 207 married couples who lived together. The research instruments were Eysench's 57 item personality scale, Enrich's 47 marital satisfaction questionnaire, and researcher made informative questionnaire. Couples filled the questionnaires first and then they were divided into sixteen different groups according to the similarity or dissimilarity of their introversion / extroversion personality characteristics. Data were collected and descriptive statistics was used for data analysis. One way Anova and LSD test were used to determine the significance of means difference. In the light of previous research and five hypotheses of the present research the following results were obtained which can be used in pre and post marriage counseling: 1) The highest degree of marital Satisfaction was observed among couples composed of a moderate introvert / extrovert and an introvert partner. 2) The second highest degree of marital satisfaction belonged to the married couples who were both normal extroverts. 3) The third highest degree of marital satisfaction was observed among married couples who were excessive introverts or a moderate person and an excessive introvert. 4) The degree of marital satisfaction of an introvert female married to an extrovert male fell in the fourth category. 5) The degree of marital satisfaction of an introvert females married to an excessive extrovert male 6) The least degree of marital satisfaction was observed among an extrovert female married to an introvert male.

The CYGNO project for the development of a high precision optical readout gaseous TPC for directional Dark Matter search and solar neutrino spectroscopy will be presented. It is to be hosted at Laboratori Nazionali del Gran Sasso. CYGNO peculiar features are the use of sCMOS cameras and PMTs coupled to GEMs amplification of a helium-based gas mixture at atmospheric pressure, in order to achieve 3D tracking with head tail capability and background rejection down to O(keV) energy, to boost sensitivity to low WIMP masses. The latest R&D results within the CYGNO project will be discussed along with the underground installation and operation of a 50 l prototype, soon to be followed by a O(1) m3 experiment demonstrator in 2024-2026. The latest results on the negative ion drift operation at atmospheric pressure within CYGNO optical readout approach will be illustrated, which is the aim of the ERC Consolidator Grant project INITIUM.