Recent results on two-photon physics at BABAR
نویسنده
چکیده
We present measurements of the γγ * → π 0 transition form factor for the momentum transfer range Q 2 =4–40 GeV 2 and the γγ * → η c transition form factor for the range Q 2 =2–50 GeV 2. The results of the measurement of the η c mass, total and two-photon widths are also presented.
منابع مشابه
Search for exotics at BABAR
One of the most intriguing puzzles in hadron spectroscopy are the numerous charmonium-like states observed in the last decade, including charged states that are manifestly exotic. Over the years, the experiment BABAR has extensively studied those in B meson decays, initial state radiation processes and two photon reactions. We report in this paper new and additional studies on some of those sta...
متن کاملRecent results on two-photon and tau physics at BABAR
We present a measurement of the total width Γc tot and mass Mηc of the ηc meson with the BABAR detector at the PEP-II B-factory at SLAC. The results based on a data sample of 88 fb are Γc tot = (33.3±2.5(stat.)±0.8(sys.))MeV/c 2 andMηc = (2983.3±1.2±1.8) MeV/c . An enhancement observed around 3.63 GeV/c can be interpreted as an evidence for the ηc(2S) state. In addition a preliminary measuremen...
متن کاملInfluence of Compensator Thickness and Field Size on Buildup factor of a Brass Compensator for Intensity- Modulated Radiation Therapy
Introduction: Radiotherapy is one of the effective methods in the treatment of cancer. In the recent methods of radiotherapy, intensity modulated radiotherapy (IMRT) technique by compensators is used. when photon beam passes the compensator, scattered photons can be generated within the compensator. The presence of scattered photons may complicate the design of compensators as...
متن کاملThe effect of high energy photon beam in dose- volume parameters and integral dose of normal structures in Head and neck IMRT
Introduction: The aim of this study is to investigate the effect of partially used high photon energies on dosimetric parameters and integral doses of nasopharynx IMRT plans. Materials and Methods: Two 7 coplanar IMRT plan were created for eleven patients (6 MV only IMRT plan in both phase1 and phase2 and 6 MV phase1-mixed energies (6 MV and 15 MV) phase2...
متن کاملDosimetric Study of Tissue Heterogeneity Correction for Breast Conformal Radiotherapy
Introduction: Heterogeneity correction is an important parameter in dose calculation for cancer patients where it may be cause inaccuracy in dose calculation as a result of different densities of patients. This study studied the impact of dose calculation of breast cancer patients with and without heterogeneity correction. Material and Methods: Twenty breast cancer patients were treated with Th...
متن کامل