Rare decays of the η meson

被引：0

作者：

Papandreou, Z ^{[1
]}

机构：

[1] Univ Regina, Dept Phys, Regina, SK S4S 0A2, Canada

来源：

HADRON SPECTROSCOPY | 2006年 / 814卷

关键词：

eta meson; rare decays; partial width; branching ratio;

D O I：

暂无

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

A study of several rare eta decays near threshold was carried out at the C-6 (pi(-)) beamline of the Alternating Gradient Synchrotron at Brookhaven National Laboratory with the Crystal Ball detector, an electromagnetic calorimeter with nearly 4 pi geometric acceptance that is comprised of 672 optically isolated NaI(T1) crystals with a thickness of 15.7 radiation lengths. Results from the search for the CP forbidden decay eta -> 4 pi(0) and the investigation of the quadratic slope parameter in eta -> 3 pi(0) decay will be profiled, among others. The focus of the talk will be on the eta -> pi(0)gamma gamma rare decay: its relative branching ratio was extracted to be B-1 = (8.3 +/- 2.8 +/- 1.2) x 10(-4), based on the analysis of 3 x 10(7) detected eta mesons.This leads to a partial width for the eta meson of Gamma(eta ->eta(0)gamma gamma) = (0.32 +/- 0.15) eV/c(2), a value much lower than past measurements and in line with Chiral Perturbation Theory calculations.

引用

页码：453 / 457

页数：5

共 11 条

[1] Search for the radiative decay η → π0γγ in the SND experiment at VEPP-2M [J].

Achasov, MN ;

Beloborodov, KI ;

Berdyugin, AV ;

Bozhenok, AV ;

Bogdanchikov, AG ;

Bukin, DA ;

Burdin, SV ;

Dimova, TV ;

Drozdetsky, AA ;

Druzhinin, VP ;

Ganyushin, DI ;

Golubev, VB ;

Ivanchenko, VN ;

Koop, IA ;

Korol, AA ;

Koshuba, SV ;

Otboev, AV ;

Pakhtusova, EV ;

Salnikov, AA ;

Shary, VV ;

Serednyakov, SI ;

Shatunov, YM ;

Sidorov, VA ;

Silagadze, ZK ;

Skripkin, AG ;

Valishev, AA ;

Vasiljev, AV ;

Velikzhanin, YS .

NUCLEAR PHYSICS B, 2001, 600 (01) :3-20

[2] CHIRAL PERTURBATION-THEORY FOR ETA-]PI(O)GAMMA-GAMMA [J].

AMETLLER, L ;

BIJNENS, J ;

BRAMON, A ;

CORNET, F .

PHYSICS LETTERS B, 1992, 276 (1-2) :185-190

[3] OBSERVATION OF THE DECAY ETA-]PI-0-GAMMA-GAMMA [J].

BINON, F ;

BRICMAN, C ;

DAVYDOV, VA ;

DONSKOV, SV ;

DUFOURNAUD, J ;

DUTEIL, P ;

GOUANERE, M ;

INYAKIN, AV ;

KACHANOV, VA ;

KAKAURIDZE, DB ;

KHAUSTOV, GV ;

KULIK, AV ;

LAGNAUX, JP ;

LEDNEV, AA ;

MIKHAILOV, YV ;

PEIGNEUX, JP ;

PROKOSHKIN, YD ;

RODNOV, YV ;

SADOVSKY, SA ;

SINGOVSKY, AV ;

STARZEV, AV ;

STROOT, JP ;

SUGONYAEV, VP .

NUOVO CIMENTO DELLA SOCIETA ITALIANA DI FISICA A-NUCLEI PARTICLES AND FIELDS, 1982, 71 (04) :497-508

[4]

ECKER G, 1989, NUCL PHYS B, V7, P1

[5] CHIRAL PERTURBATION-THEORY - EXPANSIONS IN THE MASS OF THE STRANGE QUARK [J].

GASSER, J ;

LEUTWYLER, H .

NUCLEAR PHYSICS B, 1985, 250 (03) :465-516

[6] Review of particle physics -: art. no. 010001 [J].

Hagiwara, K ;

Hikasa, K ;

Nakamura, K ;

Tanabashi, M ;

Aguilar-Benitez, M ;

Amsler, C ;

Barnett, RM ;

Burchat, PR ;

Carone, CD ;

Caso, C ;

Conforto, G ;

Dahl, O ;

Doser, M ;

Eidelman, S ;

Feng, JL ;

Gibbons, L ;

Goodman, M ;

Grab, C ;

Groom, DE ;

Gurtu, A ;

Hayes, KG ;

Hernández-Rey, JJ ;

Honscheid, K ;

Kolda, C ;

Mangano, ML ;

Manley, DM ;

Manohar, AV ;

March-Russell, J ;

Masoni, A ;

Miquel, R ;

Monig, K ;

Murayama, H ;

Navas, S ;

Olive, KA ;

Pape, L ;

Patrignani, C ;

Piepke, A ;

Roos, M ;

Terning, J ;

Tornqvist, NA ;

Trippe, TG ;

Vogel, P ;

Wohl, CG ;

Workman, RL ;

Yao, WM ;

Armstrong, B ;

Gee, PS ;

Lugovsky, KS ;

Lugovsky, SB ;

Lugovsky, VS .

PHYSICAL REVIEW D, 2002, 66 (01)

[7]

KNECHT NS, 2002, THESIS U REGINA

[8] Test of charge conjugation invariance -: art. no. 041601 [J].

Nefkens, BMK ;

Prakhov, S ;

Gårdestig, A ;

Allgower, CE ;

Bekrenev, V ;

Briscoe, WJ ;

Clajus, M ;

Comfort, JR ;

Craig, K ;

Grosnick, D ;

Isenhower, D ;

Knecht, N ;

Koetke, D ;

Koulbardis, A ;

Kozlenko, N ;

Kruglov, S ;

Lolos, G ;

Lopatin, I ;

Manley, DM ;

Manweiler, R ;

Marusic, A ;

McDonald, S ;

Olmsted, J ;

Papandreou, Z ;

Peaslee, D ;

Phaisangittisakul, N ;

Price, JW ;

Ramirez, AF ;

Sadler, M ;

Shafi, A ;

Spinka, H ;

Stanislaus, TDS ;

Starostin, A ;

Staudenmaier, HM ;

Supek, I ;

Tippens, WB .

PHYSICAL REVIEW LETTERS, 2005, 94 (04)

[9] Measurement of the branching ratio for η→π0γγ decay -: art. no. 025201 [J].

Prakhov, S ;

Nefkens, BMK ;

Allgower, CE ;

Bekrenev, V ;

Briscoe, WJ ;

Clajus, M ;

Comfort, JR ;

Craig, K ;

Grosnick, D ;

Huber, GM ;

Isenhower, D ;

Knecht, N ;

Koetke, D ;

Koulbardis, A ;

Kozlenko, N ;

Kruglov, S ;

Lolos, G ;

Lopatin, I ;

Manley, DM ;

Manweiler, R ;

Marusic, A ;

McDonald, S ;

Olmsted, J ;

Papandreou, Z ;

Peaslee, D ;

Phaisangittisakul, N ;

Price, JW ;

Ramirez, AF ;

Sadler, M ;

Shafi, A ;

Spinka, H ;

Stanislaus, TDS ;

Starostin, A ;

Staudenmaier, HM ;

Supek, I ;

Tippens, WB .

PHYSICAL REVIEW C, 2005, 72 (02)

[10] Search for the CP forbidden decay η → 4π0 [J].

Prakhov, S ;

Tippens, WB ;

Allgower, C ;

Bekrenev, V ;

Berger, E ;

Briscoe, WJ ;

Clajus, M ;

Comfort, JR ;

Craig, K ;

Grosnick, D ;

Huber, GM ;

Isenhower, D ;

Knecht, N ;

Koetke, D ;

Koulbardis, A ;

Kozlenko, N ;

Kruglov, S ;

Kycia, T ;

Lolos, GJ ;

Lopatin, I ;

Manley, DM ;

Marusic, A ;

Manweiler, R ;

McDonald, S ;

Nefkens, BMK ;

Olmsted, J ;

Papandreou, Z ;

Peaslee, D ;

Peterson, GJ ;

Phaisangittisakul, N ;

Pulver, M ;

Ramirez, AF ;

Sadler, ME ;

Shafi, A ;

Slaus, I ;

Spinka, H ;

Stanislaus, S ;

Starostin, A ;

Staudenmaier, HM ;

Supek, I ;

Wong, CW .

PHYSICAL REVIEW LETTERS, 2000, 84 (21) :4802-4805

← 1 2 →