Results of the Searches for Narrow Baryonic States with Strangeness in Dis at Hera

نویسنده

  • S. CHEKANOV
چکیده

Searches for narrow baryonic states in the K S p, Kp, Ξ π and Ξ̄ π decay channels are reported. The data were collected with the ZEUS detector at HERA using an integrated luminosity of 121 pb. The searches were performed in the central rapidity region of inclusive deep inelastic scattering at an ep centre-ofmass energy of 300–318 GeV for exchanged photon virtuality, Q, above 1 GeV. The results support the existence of a narrow baryonic state with strangeness in K S p and K S p̄ decay channels, consistent with the pentaquark prediction. No pentaquark signals were found in the Kp, Ξ π and Ξ̄ π channels.

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Study of Narrow Baryonic Pentaquark Candidates with the Zeus Detector at Hera∗

The three pentaquark candidates Θ(1530), Ξ(1862) and Θc(3100) have been studied in ep collisions at a centre-of-mass energy √ s = 300 − 318 GeV using the full luminosity of the HERA-I data. Searches for narrow baryonic states in the decay channels K S p, Kp, Ξ−π±, Ξ̄+π± and D∗±p∓ are reported. The results support the existence of a narrow resonance decaying into K S p and K S p̄, consistent with ...

متن کامل

Search for Baryonic Resonances

A search for narrow baryonic resonances produced in deep inelastic scattering and decaying to K s p (K s p̄) or Ξ−π− (Ξπ and their antiparticles) is carried out with the H1 detector at HERA. No signal is observed for a new baryonic state. Upper limits on σ(ep → eΘX) × BR(Θ → Kp) and on the ratio of the production rates of hypothetical baryonic states relative to the Ξ(1530) baryonic state are ob...

متن کامل

Strangeness Production and Hadron Spectroscopy at HERA

An overview of the recent results on strangeness production and spectroscopy from the electron-proton collider experiments H1 and ZEUS at HERA is presented. Production of particles with light and strange quarks is discussed and compared with both theoretical predictions and with data from ee experiments. Measurements in the charm sector cover studies of the radially and orbitally excited charm ...

متن کامل

Results of the searches for pentaquarks with strangeness in DIS at HERA

The K 0 S p invariant mass spectrum was reconstructed in several kinematic regions with the main emphasis on the studies of the production mechanism of the Θ + candidate recently observed by ZEUS. The candidate Θ + signal was found to be produced predominantly in the forward hemisphere in the laboratory frame. This is unlike the case for the Λ(1520) or the Λ c , and indicates that the Θ + may h...

متن کامل

Double-Strangeness Studies at FLAIR

Studies of hadronic systems involving double strangeness (S = -2) are practically limited to searches for the Hparticle, a system of B = 2, S = -2, first proposed by Jaffe [1] which up to now was not observed. Apart from this exotic object the measurement of the interaction in hadronic systems with double strangeness is of general QCD interest and will result in a better understanding of the st...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

عنوان ژورنال:

دوره   شماره 

صفحات  -

تاریخ انتشار 2004